CN115712171A - Optical add drop multiplexer - Google Patents

Abstract

The application provides an optical add/drop multiplexer, which belongs to the technical field of optical communication. The optical add/drop multiplexer includes an input component, a filter diaphragm, an output component and a transmission loopback component. In the process of adjusting the downwave wavelength or upwave wavelength to the target wavelength, the input component receives the first input light, adjusts the incident angle of the output light of the first input light incident on the filter diaphragm, and the transmission loopback component receives the first input The output light of the light filters the transmitted light of the diaphragm, and outputs the transmitted light to the output component. The output component receives the reflected light and the transmitted light of the output light of the first input light on the filter film, and outputs the reflected light and the transmitted light in a straight-through manner. In this way, the downwave wavelength or the upwave wavelength can be automatically adjusted, and in the process of adjusting the downwave wavelength or the upwave wavelength, both the reflected light and the transmitted light of the input light on the filter diaphragm can be output directly, which can reduce the loss of input light .

Description

OADM

technical field

The present application relates to the technical field of optical communication, in particular to an optical add-drop multiplexer.

Background technique

With the increasing demand for WDM in counties and townships, the core aggregation network in the metropolitan area is sinking, so it is necessary to use optical add-drop multiplexers. An optical add-drop multiplexer is an optical wavelength division multiplexing device that can separate a single wavelength of light from multiple wavelengths of light, or add a single wavelength of light to multiple wavelengths of light.

In related technologies, a fixed optical add-drop multiplexer is usually used, and the fixed optical add-drop multiplexer can fixedly drop a single wavelength of light, or fixedly add a single wavelength of light. In this way, when adjusting the wavelength of the dropped light or the wavelength of the added light, it is necessary to manually insert and unplug the optical fiber for operation, resulting in relatively poor flexibility of the optical add-drop multiplexer.

Contents of the invention

The present application provides an optical add-drop multiplexer, which can automatically change the light to be added or added, so that the optical add-drop multiplexer is more flexible.

In a first aspect, the present application provides an optical add-drop multiplexer. The optical add-drop multiplexer includes an input component, a filter diaphragm, a transmissive loopback component and an output component. The input component is used to receive the first input light, and adjust the incident angle at which the output light of the first input light enters the filter film during the process of adjusting the downwave wavelength or the upwave wavelength to the target wavelength. The transmission loopback component is used to receive the first transmitted light of the output light of the first input light in the filter diaphragm, and output the first transmitted light to the output component. The output component is configured to receive the first reflected light and the first transmitted light of the output light of the first input light in the filter film, and output the first reflected light and the first transmitted light through through.

In the solution shown in this application, by adjusting the incident angle of the first input light incident on the filter film, the downwave wavelength or upwavelength of the optical add/drop multiplexer is adjusted. In the process of adjusting the downwave wavelength or upwavelength wavelength of the optical add-drop multiplexer to the target wavelength, both the reflected light and the transmitted light of the first input light on the filter diaphragm can be output through through, without causing the first Input light loss. Therefore, the downwave wavelength or the upwave wavelength can be automatically adjusted, and in the process of adjusting the downwave wavelength or the upwave wavelength, both the reflected light and the transmitted light of the input light on the filter film can be output directly, which can reduce the loss of input light .

In a possible implementation manner, the optical add/drop multiplexer is a wavelength splitting device, and after adjusting the incident angle to a target value corresponding to the target wavelength, the transmission loopback component is used to receive the output light of the first input light at The second transmitted light of the filter is filtered, and the second transmitted light is transmitted and output. The output component is configured to receive the second reflected light of the output light of the first input light on the filter film, and output the second reflected light through through.

In the scheme shown in this application, when the optical add-drop multiplexer is used as a wave splitting device, after the incident angle is adjusted to the target value corresponding to the target wavelength, after the first input light is incident on the filter diaphragm, the filter diaphragm transmits 100% of the target wavelength. Light. The transmission loopback component transmits and outputs the light of the target wavelength to realize downwave. The output component directly outputs the output light of the first input light on the reflected light of the filter film. In this way, the optical add-drop multiplexer implements the drop-wave function.

In a possible implementation, the optical add-drop multiplexer is a multiplexer device, after adjusting the incident angle to the target value corresponding to the target wavelength, the transmission loopback component is used to receive the second input light, according to the incident angle The second input light is incident to the filter diaphragm for the target value, and the wavelength of the second input light is the target wavelength; the output component is used to receive the second reflected light of the output light of the first input light on the filter diaphragm and the second input light The light filters the third transmitted light of the diaphragm, and outputs the second reflected light and the third transmitted light through through.

In the scheme shown in this application, when the optical add-drop multiplexer is used as a wave combining device, after the incident angle is adjusted to the target value corresponding to the target wavelength, after the first input light is incident on the filter diaphragm, the filter diaphragm transmits 100% of the target wavelength. For light, the first input light does not include light of the target wavelength, and there is no transmitted light after the first input light is incident on the filter film. The transmission loopback component injects the upwave input light (that is, the second input light) into the filter diaphragm according to the incident angle as the target value, so as to realize the transmission of the second input light through the filter diaphragm. The output component directly outputs the reflected light of the output light of the first input light on the filter film and the transmitted light of the second input light on the filter film. In this way, the optical add/drop multiplexer realizes the wavelength adding function.

In a possible implementation manner, the input component includes a first movable reflector, and during the process of adjusting the downwave wavelength or the upwave wavelength to the target wavelength, the first movable reflector is used to receive the first input light , adjust the incident angle of the output light of the first input light incident on the filter film by rotating; after adjusting the incident angle to the target value corresponding to the target wavelength, the first movable mirror is used to receive the first input light, and the The output light of the first input light is incident on the filter film. In this way, the incident angle can be adjusted by rotating the movable mirror, which can make the control simple and convenient.

In a possible implementation manner, the input assembly further includes a first fixed reflector; the first movable reflector is arranged on the optical path between the first fixed reflector and the filter film; the first fixed reflector is used for The first input light is received, and the first input light is reflected to the first movable mirror. In this way, the transmission direction of the first input light can be changed by using the first fixed mirror, so that the volume of the optical add-drop multiplexer can be relatively small.

In a possible implementation manner, the output component includes a second movable reflector; during the process of adjusting the downwave wavelength to the target wavelength, the second movable reflector is used to receive the first reflected light and the first transmitted light light, and output the first reflected light and the first transmitted light through rotation; after adjusting the incident angle to the target value corresponding to the target wavelength, the second movable mirror is used to receive the second reflected light, and The second reflected light is output through through. In this way, the through output of the optical add-drop multiplexer can be realized by rotating the movable reflector, which can make the control simple and convenient.

In a possible implementation manner, the output component further includes a second fixed reflector, and the second fixed reflector is configured to output the light reflected by the second movable reflector through through. In this way, the transmission direction of the light reflected by the second movable mirror can be changed by the second fixed mirror, so that the volume of the optical add/drop multiplexer can be relatively small.

In a possible implementation manner, the transmission loopback component includes a third movable reflector and a fourth movable reflector; The movable reflector is used to receive the first transmitted light, and output the first transmitted light to the output component through rotation; after adjusting the incident angle to the target value corresponding to the target wavelength, the third movable reflector is used to receive the second transmitted light, and transmit the second transmitted light through rotation to output.

In the scheme shown in this application, when the optical add-drop multiplexer is a wave-division device, in the process of adjusting the downstream wavelength of the optical add-drop multiplexer, the movable mirror can rotate the transmitted light Straight-through output can make the control easy. Moreover, after the downstream wavelength of the optical add/drop multiplexer is adjusted to the target wavelength, the first input light is incident on the filter film according to the incident angle of the target value, and the filter film transmits the light of the target wavelength in the first input light. The third movable reflector transmits and outputs the light of the target wavelength through rotation. In this way, when the downwave wavelength of the optical add/drop multiplexer is adjusted to the target wavelength, downwave processing can be performed on the light of the target wavelength.

In a possible implementation manner, the optical add/drop multiplexer is a wavelength splitting device, the input component includes a first polarization beam splitting component, the output component includes a first polarization beam combining component, and the transmission loopback component includes a second polarization beam combining component components. The first polarization beam-splitting component is used to perform polarization-splitting of the first input light before entering the filter film into single-polarized light. The first polarization beam combining component is used to perform polarization combination on the through-through output light before the through-through output into dual polarized light. The second polarization beam combining component is used to convert the transmitted output light into dual polarized light through polarization combining before the transmitted output.

In the solution shown in this application, when the optical add/drop multiplexer is a wavelength splitting device, the first polarization beam splitting component converts the first input light into single polarized light, and the single polarized light is incident on the filter diaphragm, so that the first input When the light passes through the filter diaphragm, the light filtering bandwidth for the same wavelength is the same. When the through-through output is finally performed, the single-polarized light is converted into polarization-combined light (also called double-polarized light) by the first polarization beam-combining component, so that the through-output light is the polarization-combined light. Finally, when transmitting and outputting, the single-polarized light is converted into polarization-combined light by the second polarization beam combining component, so that the transmitted and output light is polarized beam-combining light.

In a possible implementation manner, the optical add-drop multiplexer further includes a first movable half-wave plate, and the first movable half-wave plate is disposed on an optical path between the filter film and the first polarization beam splitting component. The first movable half-wave plate is used to change the polarization state of the first input light after polarization beam splitting by rotation. In this way, the first movable half-wave plate can continuously change the polarization state of the single polarized light after the first input light undergoes polarization beam splitting, and then can continuously change the filtering bandwidth of the single polarized light in the filter diaphragm.

In a possible implementation manner, the output component includes a second movable reflector, and during the process of adjusting the wavelength of the upper wave to the target wavelength, the second movable reflector is used to receive the first reflected light and the first transmitted light light, and output the first reflected light and the first transmitted light through rotation. After the incident angle is adjusted to the target value corresponding to the target wavelength, the second movable mirror is used to receive the second reflected light and the third transmitted light, and output the second reflected light and the third transmitted light through through. In this way, the through output of the optical add-drop multiplexer can be realized by rotating the movable reflector, which can make the control simple and convenient.

In a possible implementation manner, the transmission loopback component includes a third movable reflector and a fourth movable reflector. The movable reflector is used for receiving the first transmitted light and outputting the first transmitted light to the output assembly through rotation. After the incident angle is adjusted to the target value corresponding to the target wavelength, the third movable mirror is used to receive the second input light, and inject the second input light into the filter film according to the incident angle as the target value.

In the solution shown in this application, when the optical add-drop multiplexer is a wave combining device, in the process of adjusting the wavelength of the optical add-drop multiplexer, the movable mirror can rotate the transmitted light Straight-through output can make the control easy. When the incident angle is adjusted to the target value, the adding wavelength of the optical add/drop multiplexer is adjusted to the target wavelength, and the wavelength of the second input light is the target wavelength. The rotation of the third movable reflector is controlled, and the light of the target wavelength is input to the filter film, and the filter film transmits the light of the target wavelength. In this way, when the adding wavelength of the optical add/drop multiplexer is adjusted to the target wavelength, adding can be realized.

In a possible implementation manner, the input component includes a first polarization beam splitting component, the output component includes a first polarization beam combining component, and the transmission loopback component includes a second polarization beam splitting component. The first polarization beam-splitting component is used to perform polarization-splitting of the first input light before entering the filter film into single-polarized light. The second polarizing beam splitting component is used to split the second input light into single polarized light before it enters the filter film. The first polarization beam combining component is used to polarize and combine the light output by the filter film into dual polarized light before outputting.

In the solution shown in this application, when the optical add/drop multiplexer is a wave combining device. The second polarization beam splitting component converts the second input light into single polarized light, and the single polarized light is incident on the filter film, so that the second input light has the same light filtering bandwidth for the same wavelength when passing through the filter film. Finally, when the through output is performed, the single polarized light is converted into the polarization combined light by the first polarization beam combining component, so that the through output light is the polarization combined light.

In a possible implementation manner, the optical add-drop multiplexer further includes a second movable half-wave plate, and the second movable half-wave plate is arranged on an optical path between the filter film and the second polarization beam splitting component. The second movable half-wave plate is used to change the polarization state of the second input light after polarization beam splitting by rotation.

In the solution shown in this application, the second movable half-wave plate can continuously change the polarization state of the single-polarized light after the second input light has undergone polarization splitting by rotating, and then can continuously change the filtering of the single-polarized light in the filter diaphragm. bandwidth.

In a second aspect, the present application provides an optical add-drop multiplexer, the optical add-drop multiplexer includes a first input assembly, a full reflection diaphragm, at least one first filter diaphragm and a first output assembly; each of the first The filtering bandwidth of a filter film is different; the first input component is used to receive the first input light, and adjust the output light of the first input light to enter the The incident angle of the total reflection diaphragm; after the incident angle is adjusted to the target value corresponding to the target wavelength, the target filter diaphragm in at least one first filter diaphragm moves into the output optical path of the first input component, and the total reflection diaphragm moves out On the output optical path of the first input component; the first filter film is used to transmit the light of the target wavelength in the output light of the first input light; the first output component is used to output the total reflection film and the target filter film light output.

In the solution shown in this application, by adjusting the incident angle of the first input light incident on the spliced diaphragm, the downwave wavelength or upwavelength wavelength of the optical add/drop multiplexer is adjusted. In the process of adjusting the downwave wavelength or upwave wavelength of the optical add-drop multiplexer to the target wavelength, the total reflection diaphragm is on the output optical path of the first input component, and the first input light is completely reflected by the total reflection diaphragm , performing a through output without loss of the first input light. Moreover, when the incident angle is adjusted to the target value, the first filter diaphragm moves into the output optical path of the first input component, and the total reflection diaphragm moves out of the output optical path of the first input component, so that the light of the target wavelength can be transmitted and output, realizing The downwave function, or it can input the light upwave of the target wavelength to realize the upwave function. Therefore, the downwave wavelength or the upwave wavelength can be automatically adjusted, and in the process of adjusting the downwave wavelength or the upwavelength, the input light can be directly output, and the loss of the input light can be reduced.

In a possible implementation manner, the optical add/drop multiplexer is a wavelength splitting device, and the first input component includes a first movable mirror. In the process of adjusting the wavelength of the downwave to the target wavelength, the first movable reflector is used to receive the first input light, and adjust the incident angle of the output light of the first input light incident on the total reflection film by rotating. After the incident angle is adjusted to a target value corresponding to the target wavelength, the first movable reflector is used to receive the first input light, and input the output light of the first input light to the target filter film. In this way, the incident angle can be adjusted by rotating the movable mirror, which can make the control simple and convenient.

In a possible implementation manner, the first input component further includes a first fixed reflector, the first movable reflector is arranged on the optical path between the first fixed reflector and the spliced diaphragm, and the first fixed reflector is used for to reflect the first input light to the first movable mirror. In this way, the transmission direction of the first input light can be changed by using the first fixed mirror, so that the volume of the optical add-drop multiplexer can be relatively small.

In a possible implementation manner, the first output component includes a first sub-output component and a second sub-output component. In the process of adjusting the wavelength of the downwave to the target wavelength, the first sub-output component is used to output the reflected light output by the total reflection diaphragm through through. After adjusting the incident angle to the target value corresponding to the target wavelength, the first sub-output component is used to output the reflected light output by the target filter diaphragm through through, and the second sub-output component is used to output the reflected light output by the target filter diaphragm. Transmitted light is output in transmission. In this way, when the optical add/drop multiplexer is a wavelength splitting device, the first sub-output component can realize the through output, and the second sub-output component can realize the transmission output.

In a possible implementation manner, the first sub-output assembly includes a second movable mirror. In the process of adjusting the wavelength of the downwave to the target wavelength, the second movable mirror is used to output the reflected light output by the total reflection diaphragm through rotation. After the incident angle is adjusted to the target value corresponding to the target wavelength, the second movable reflector is used to pass through the reflected light output by the target filter film. In this way, the through output of the optical add-drop multiplexer can be realized by rotating the movable reflector, which can make the control simple and convenient.

In a possible implementation manner, the second sub-output assembly includes a third movable mirror. After the incident angle is adjusted to the target value corresponding to the target wavelength, the third movable mirror is used to transmit and output the transmitted light output by the target filter membrane through rotation. In this way, the transmission output can be realized by rotating the movable mirror, which can make the control simple and convenient.

In a possible implementation manner, the first input component includes a first polarization beam splitting component, the first sub-output component includes a first polarization beam combining component, and the second sub-output component includes a second polarization beam combining component. The first polarizing beam splitting component is used to polarize and split the first input light into single polarized light before entering the target filter film. The first polarization beam combining component is used to polarize and combine the reflected light output by the target filter film into dual polarized light before passing through the output. The second polarization beam combining component is used to combine the transmitted light output by the target filter film into dual polarized light before being transmitted and outputted.

In the solution shown in this application, when the optical add/drop multiplexer is a wavelength splitting device, the first polarization beam splitting component converts the first input light into single polarized light, and the single polarized light is incident on the filter diaphragm, so that the first input When the light passes through the filter diaphragm, the light filtering bandwidth for the same wavelength is the same. Finally, when the through output is performed, the single polarized light is converted into the polarization combined light by the first polarization beam combining component, so that the through output light is the polarization combined light. Finally, when transmitting and outputting, the single-polarized light is converted into polarization-combined light by the second polarization beam combining component, so that the transmitted and output light is polarized beam-combining light.

In a possible implementation manner, the optical add/drop multiplexer is a multiplexing device, and the first input component includes a first sub-input component and a second sub-input component. In the process of adjusting the wavelength of the upwave to the target wavelength, the first sub-input component is used to receive the first input light and adjust the incident angle of the output light of the first input light incident on the total reflection film. After adjusting the incident angle to the target value corresponding to the target wavelength, the first sub-input component is used to receive the first input light, and the output light of the first input light is incident to the target filter diaphragm, and the second sub-input component is used to After receiving the second input light, the output light of the second input light is incident on the target filter film according to the incident angle as the target value, and the wavelength of the second input light is the target wavelength.

In the solution shown in this application, when the optical add/drop multiplexer is a multiplexing device, the first sub-input component can realize direct input, and the second sub-input component can realize upwave output.

In a possible implementation manner, the first sub-input component includes a first movable mirror. The first movable reflector is used to adjust the incident angle of the output light of the first input light incident on the total reflection film through rotation. After the incident angle is adjusted to a target value corresponding to the target wavelength, the first movable reflector is used to receive the first input light, and input the output light of the first input light to the target filter film. In this way, the incident angle can be adjusted by rotating the movable mirror, which can make the control simple and convenient.

In a possible implementation manner, the second sub-input component includes a third movable mirror. The third movable reflector is used to receive the second input light, and through rotation, the output light of the second input light is incident to the target filter film according to the incident angle as the target value. In this way, the incident angle can be controlled by rotating the movable mirror, which can make the control simple and convenient.

In a possible implementation manner, the first output component includes a second movable mirror. In the process of adjusting the wavelength of the upper wave to the target wavelength, the second movable reflector is used to pass through the reflected light output by the total reflection diaphragm through rotation. After the incident angle is adjusted to the target value corresponding to the target wavelength, the second movable mirror is used to output the reflected light and the transmitted light output by the target filter film through through. In this way, the straight-through output during multiplexing can be realized through the movable mirror, which can make the control simple and convenient.

In a possible implementation manner, the first sub-input component includes a first polarization beam splitting component, the second sub-input component includes a second polarization beam splitting component, and the first output component includes a first polarization beam combining component. The first polarizing beam splitting component is used to polarize and split the first input light into single polarized light before entering the target filter film. The second polarization beam splitting component is used to convert the second input light into single polarized light through polarization splitting before entering the target filter film. The first polarization beam combining component is used to perform polarization beam combination on the output light before outputting it into dual polarized light.

In the solution shown in this application, when the optical add/drop multiplexer is a multiplexer, the second polarization beam splitting component converts the second input light into single-polarized light, and the single-polarized light is incident on the filter diaphragm, so that the second input When the light passes through the filter diaphragm, the light filtering bandwidth for the same wavelength is the same. Finally, when the through output is performed, the single polarized light is converted into the polarization combined light by the first polarization beam combining component, so that the through output light is the polarization combined light.

Description of drawings

Fig. 1 is a schematic diagram of the relationship between the transmission wavelength and the incident angle provided by an exemplary embodiment of the present application;

Fig. 2 is a schematic structural view of a filter diaphragm provided by an exemplary embodiment of the present application;

Fig. 3 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a wavelength splitting device;

Fig. 4 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a wavelength splitting device;

Fig. 5 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a wavelength splitting device;

Fig. 6 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a wavelength splitting device;

Fig. 7 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a wavelength splitting device;

Fig. 8 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a wavelength splitting device;

Fig. 9 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a wavelength splitting device;

Fig. 10 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a wavelength splitting device;

Fig. 11 is a schematic structural diagram of a polarization beam splitting component provided by an exemplary embodiment of the present application;

Fig. 12 is a schematic structural diagram of a polarization beam combining assembly provided by an exemplary embodiment of the present application;

Fig. 13 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a multiplexing device;

Fig. 14 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a multiplexing device;

Fig. 15 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a multiplexing device;

Fig. 16 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a multiplexing device;

Fig. 17 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a multiplexing device;

Fig. 18 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a multiplexing device;

Fig. 19 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a multiplexing device;

Fig. 20 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a multiplexing device;

Fig. 21 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a wavelength splitting device;

Fig. 22 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a wavelength splitting device;

Fig. 23 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a wavelength splitting device;

Fig. 24 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a wavelength splitting device;

Fig. 25 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a wavelength splitting device;

Fig. 26 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a wavelength splitting device;

Fig. 27 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a multiplexing device;

Fig. 28 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a multiplexing device;

Fig. 29 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a multiplexing device;

Fig. 30 is a schematic structural diagram of an optical add/drop multiplexer provided by an exemplary embodiment of the present application as a multiplexing device;

Fig. 31 is a graph of the relationship between the rotation angle of the movable half-wave plate and the filtering bandwidth provided by an exemplary embodiment of the present application.

illustration

11. Input component; 12 Filter diaphragm; 13. Transmission loop component; 14. Output component; 15. First movable half-wave plate; 16. Second movable half-wave plate; 111. First movable mirror ; 112, the first fixed mirror; 113, the first polarization beam splitting assembly; 114, the lens; 131, the third movable mirror; 132, the fourth movable mirror; 133, the second polarization beam combining assembly; 134 135. The third fixed reflector; 136. The fourth fixed reflector; 137. The fifth fixed reflector; 141. The second movable reflector; 142. The first polarized beam combiner; 143. The second fixed mirror; 21. The first input assembly; 22. The total reflection diaphragm; 23. The first filter diaphragm; 24. The first output assembly; 211. The first sub-input assembly; 212. The second sub-assembly Input component; 241, the first sub-output component; 242, the second sub-output component.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

In order to facilitate the understanding of the embodiments of this application, the following first introduces some terms and concepts involved for explanation:

1. An optical add/drop multiplexer is an optical wavelength division multiplexing device that can separate a single wavelength of light from multiple wavelengths of light, or add a single wavelength of light to multiple wavelengths of light.

2. The filter diaphragm is a diaphragm with different incident angles that make the transmitted wavelengths different, that is, each transmitted wavelength corresponds to an incident angle. The incident angle is the angle at which light is incident on the filter film. Figure 1 shows the relationship between the transmission wavelength and the incident angle of the filter diaphragm. In FIG. 1 , the horizontal axis represents the incident angle, and the vertical axis represents the transmitted wavelength. In Fig. 1, the solid line curve and the dotted line curve represent the relationship between the transmission wavelength and the incident angle of the two filter diaphragms respectively.

FIG. 2 also shows the structure of the filter diaphragm. The filter diaphragm includes a filter surface, a glass substrate and an anti-reflection surface. The filter surface can also be called a reflection surface, and the anti-reflection surface can also be called a transmission surface. The function of the filter surface is to pass light of a certain wavelength and reflect light of other wavelengths, and the function of the anti-reflection surface is to transmit light of various wavelengths. The upper surface of the glass substrate is alternately coated with multi-layer filtering surfaces, and the lower surface of the glass substrate is coated with anti-reflection surfaces.

The structure shown in FIG. 2 is only a possible structure, and any diaphragm used to realize the function of the filter diaphragm provided by the embodiment of the present application can be applied to the embodiment of the present application. The filter membrane shown in FIG. 2 is the filter membrane 12 and the first filter membrane 23 mentioned later.

3. The movable reflector is a reflector that can rotate in the optical path. Exemplarily, the movable mirror is realized by using a micro-electro-mechanical system (micro-electro-mechanical system, MEMS) to fix the mirror, and the fixing method may be sticking or the like. Exemplarily, the movable mirror can also be realized by using liquid crystal on silicon (LCoS), which is a display technology using active lattice reflective liquid crystal.

In the embodiment of the present application, the change of the transmission direction of the light in the light transmission plane can be controlled by controlling the rotation of the movable mirror.

4. The fixed mirror is a non-rotatable mirror in the optical path.

5. The movable half-wave plate is a half-wave plate with adjustable optical axis. Exemplarily, the movable half-wave plate is realized by means of MEMS fixing the half-wave plate, and the fixing method may be pasting or the like.

The concept of the present application is described below.

In related technologies, a fixed optical add-drop multiplexer is usually used, and the fixed optical add-drop multiplexer can fixedly drop a single wavelength of light, or fixedly add a single wavelength of light. In this way, when adjusting the wavelength of the dropped light (which can be called the downwave wavelength) or the wavelength of the added light (which can be called the upwave wavelength), it is necessary to manually insert and unplug the optical fiber for operation, resulting in the flexibility of the optical add-drop multiplexer. Relatively poor.

In this application, by changing the incident angle of the input light incident on the filter film, the transmission wavelength of the input light on the filter film is changed, thereby realizing automatic adjustment of the downwave wavelength and upwave wavelength. Moreover, in the process of changing the incident angle, both the reflected light and the transmitted light of the input light are output through the filter diaphragm, so that the input light will not be lost. Alternatively, by changing the incident angle of the input light incident on the filter film, the transmission wavelength of the input light on the filter film is changed, thereby realizing automatic adjustment of the downwave wavelength and the upwave wavelength. Moreover, in the process of changing the incident angle, the input light is incident on the total reflection diaphragm instead of the filter diaphragm, and the total reflection diaphragm completely reflects the input light and outputs it through, so that the input light will not be lost.

The application scenarios of the embodiments of the present application are described below. The optical add-drop multiplexer in the embodiment of the present application can be applied to a scenario of dropping light or adding light, that is, can be applied to a drop-wave scenario or an add-wave scenario. Exemplarily, it can be applied to county and township WDM scenarios and metropolitan access network scenarios.

The embodiment of the present application relates to an optical add-drop multiplexer based on two principles, which are briefly described as follows.

The first principle of the optical add-drop multiplexer: when the optical add-drop multiplexer is used as a wavelength-division device, before the incident angle is adjusted to the target value (that is, during the incident angle change process), the through-input light is incident to the filter Diaphragm, the through-input light (the first input light mentioned later) is output through the reflected light and transmitted light of the filter diaphragm, without losing the through-input light, and the incident angle is that the through-input light is on the filter diaphragm angle of incidence. After changing the incident angle to the target value, the incident angle of the through-input light on the filter diaphragm is the target value, the transmitted light of the through-input light on the filter diaphragm is the light of the lower wavelength, and the reflection of the through-input light on the filter diaphragm The light is light other than the light of the lower wavelength. The through-input light is output through the reflected light of the filter diaphragm, and the through-input light is transmitted through the transmitted light of the filter diaphragm to realize the down-wavelength of the wave splitting device. Function.

When the optical add-drop multiplexer is used as a multiplexing device, before the incident angle is adjusted to the target value, the through-input light is incident on the filter diaphragm, and the through-input light is output through both the reflected light and the transmitted light of the filter diaphragm. , without loss of thru input light. After changing the incident angle to the target value, since the through-input light does not include the light of the wavelength corresponding to the target value, the through-input light is not transmitted through the filter diaphragm. The straight-through input light is output through the reflected light of the filter diaphragm, and the up-wave input light (the second input light mentioned later, the wavelength of the second input light is the up-wave wavelength) is incident to the target value according to the incident angle. The filter diaphragm, the up-wave input light is not reflected on the filter diaphragm, and the up-wave input light is directly output through the transmitted light of the filter diaphragm, realizing the up-wave function of the multiplex device.

The second principle of the optical add-drop multiplexer: when the optical add-drop multiplexer is used as a wavelength-demultiplexing device, before the incident angle is adjusted to the target value (that is, during the process of changing the incident angle), the total reflection diaphragm is moved into the In the optical path, the through-input light is made to be incident on the total reflection diaphragm, and the incident angle of the through-input light on the total reflection diaphragm is adjusted, so that the reflected light of the through-input light on the total reflection diaphragm is directly output. After changing the incident angle to the target value, move the total reflection diaphragm out of the optical path, and move the filter diaphragm into the optical path, so that the incident angle of the through-input light on the filter diaphragm is also the target value. The transmitted light of the through-input light on the filter diaphragm is the light of the lower wavelength, the reflected light of the through-input light on the filter diaphragm is light other than the light of the lower wavelength, and the reflected light of the through-input light on the filter diaphragm Through-through output is performed, and the through-input light is transmitted and output through the transmitted light of the filter diaphragm, so as to realize the wave-down function of the wave splitting device.

When the optical add-drop multiplexer is used as a multiplexer, before adjusting the incident angle to the target value, move the all-reflection diaphragm into the optical path, so that the straight-through input light is incident on the all-reflection diaphragm, and adjust the through-input light at the full reflection The incident angle of the anti-diaphragm is to output the reflected light of the straight-through input light on the total reflection diaphragm. After changing the incident angle to the target value, move the total reflection diaphragm out of the optical path, and move the filter diaphragm into the optical path, so that the incident angle of the through-input light on the filter diaphragm is also the target value. Moreover, since the through-input light does not include the light of the wavelength corresponding to the target value, the through-input light is not transmitted through the filter diaphragm. The straight-through input light is output through the reflected light of the filter diaphragm, and the upper-wave input light is incident on the filter diaphragm according to the incident angle as the target value. The upper-wave input light is not reflected on the filter diaphragm, and the upper-wave input light The transmitted light of the chip is directly output to realize the wave adding function of the multiplexing device.

The optical add-drop multiplexer of the first principle is described below.

The optical add/drop multiplexer includes an input component 11 , a filter film 12 , a transmissive loopback component 13 and an output component 14 .

Exemplarily, the input component 11 , the transmissive loopback component 13 and the output component 14 cooperate with each other to realize the function of an optical add-drop multiplexer. When cooperating with each other, the input component 11 , the transmission loopback component 13 and the output component 14 are independently controlled according to certain rules. For example, the input component 11 , the transmissive loopback component 13 and the output component 14 respectively execute preset logic periodically to achieve mutual cooperation and the like. Or, when cooperating with each other, they are controlled by a control part.

Exemplarily, the control component is integrated with any one of the input component 11 , the transmission loopback component 13 or the output component 14 . For example, the control component is disposed inside the input assembly 11 as a separate controller, or is disposed in the first movable mirror 111 included in the input assembly 11 . Alternatively, the control unit is an independent device inside the optical add-drop multiplexer, such as a central processing unit (central processing unit, CPU), a chip, a field-programmable gate array (field-programmable gate array, FPGA), a complex programmable logic device ( complex programmable logic device (CPLD), micro control unit (micro controller unit, MCU), etc. Alternatively, the control unit is a controller external to the optical add-drop multiplexer.

The control components are respectively connected with the input component 11 , the output component 14 , and the transmission loopback component 13 . Exemplarily, the connection may be an electrical connection. In this embodiment of the present application, it is described by taking the control component to control the input component 11 , the transmission loopback component 13 and the output component 14 as an example.

The structure of the optical add-drop multiplexer as a wavelength-demultiplexing device is firstly introduced below.

The optical add/drop multiplexer includes a through input end, a through output end and a transmission output end. Optical fibers are respectively connected to the straight-through input end, the straight-through output end and the transmission output end. The through input end is used for inputting the first input light, and the first input light is the input light transmitted by other devices. The through output port is used to output the through light to the optical fiber, that is, to transmit the through light to other devices. The transmission output end is used to output the transmitted light to the optical fiber, that is, for downwave. The transmission output end can also be referred to as a wave-down output end.

Figure 3 shows the structure of an optical add/drop multiplexer as a wavelength division device. In the structure shown in Fig. 3, the input assembly 11 is arranged on the optical path between the straight-through input end and the filter diaphragm 12, the filter diaphragm 12 is arranged on the output optical path of the input assembly 11, and the output assembly 14 is arranged on the filter diaphragm 12 on the reflected optical path, and the transmissive loopback component 13 is arranged on the transmitted optical path of the filter film 12 .

In the structure shown in FIG. 3 , the adjustment of the drop wavelength of the optical add/drop multiplexer to the target wavelength is taken as an example for description. Exemplarily, assuming that the downstream wavelength of the current optical add-drop multiplexer is the first wavelength, the downstream wavelength of the optical add-drop multiplexer is adjusted from the first wavelength to the target wavelength, so that the downstream wavelength of the optical add-drop multiplexer Wavelength is the target wavelength. Or assuming that the current optical add-drop multiplexer does not have a downwave output (that is, there is no transmission output), adjust the downwave wavelength of the optical add-drop multiplexer to the target wavelength. In the following, the adjustment of the downstream wavelength of the optical add-drop multiplexer from the first wavelength to the target wavelength is taken as an example for description.

During the process of adjusting the downstream wavelength of the optical add-drop multiplexer to the target wavelength, the first input light is input from the through input end. The input component 11 outputs the output light of the first input light to the filter film 12 . And the input component 11 adjusts the incident angle of the first input light on the filter film 12, so that the incident angle of the first input light on the filter film 12 is adjusted to the incident angle corresponding to the target wavelength, that is, the incident angle is adjusted to the target value. For example, the control unit controls the input component 11 to output the output light of the first input light to the filter film 12, and adjust the incident angle of the first input light at the filter film 12, so that the output light of the first input light passes through the filter film. The incident angle of 12 is adjusted to the incident angle corresponding to the target wavelength. When the incident angle is at the target value, the light of the target wavelength is completely transmitted through the filter film 12 . Here, the output light of the first input light refers to the output light of the first input light from the input component 11 .

In the process of changing the incident angle, after the output light of the first input light passes through the filter film 12, the reflected light of the output light of the first input light on the filter film 12 (that is, the first reflected light) and the first input light The output light is the transmitted light of the filter diaphragm 12 (ie, the first transmitted light). The first reflected light is output to the output component 14 , and the first transmitted light is output to the transmissive loopback component 13 . The output component 14 receives the first reflected light and outputs the first reflected light to the through output end. The transmission loopback component 13 receives the first transmitted light, and outputs the first transmitted light to the output component 14, and the output component 14 also outputs the first transmitted light to the through output end. For example, the control component controls the output assembly 14 to output the first reflected light to the through output end. The control part controls the transmission loopback component 13 to output the first transmitted light to the output component 14, and the output component 14 also outputs the first transmitted light to the through output end. In this way, the first transmitted light is also output to the straight-through output end, but not to the transmission output end. In FIG. 3 , the dotted line with arrows indicates that there is no light output from the transmission output end. Similarly, in FIG. 4 to FIG. 7 and FIG. 9 hereinafter, the dotted lines with arrows also indicate that there is no light output from the transmission output end.

In this way, the downstream wavelength can be automatically adjusted by changing the incident angle. Moreover, through the transmission loopback component 13 and the output component 14, the reflected light and the transmitted light of the output light of the first input light on the filter diaphragm 12 can be output to the straight-through output end during the adjustment process of the downwave wavelength, and the transmitted light is not will be output from the transmission output port, so the loss of the first input light will not be caused.

It should be noted here that during the change of the incident angle, the reason why the output light of the first input light has transmitted light on the filter film 12 is: the incident angle of the output light of the first input light incident on the filter film 12 It is always changing, and the change of the incident angle will change the transmission wavelength of the filter film 12; The light is transmitted through the filter diaphragm 12.

It should also be noted here that since the output light of the first input light is reflected by the filter film 12 when the incident angle is changed to the target value, it can already be output to the straight-through output port, so after the incident angle is changed to the target value Before the next adjustment of the downwave wavelength, the input component 11 and the output component 14 do not need to be adjusted again, and the output light of the first input light reflected by the filter film 12 can be output to the through output end.

Exemplarily, the optical add/drop multiplexer may change the downwave wavelength when receiving the downwave wavelength change message, or may change the downwave wavelength periodically.

Exemplarily, in the structure shown in FIG. 3 , the input assembly 11 includes a first movable mirror 111 , and the first movable mirror 111 is arranged on the optical path between the through input end and the filter membrane 12 . In the process of changing the incident angle, the first movable reflector 111 receives the first input light, and the first movable reflector 111 changes the incident angle of the output light of the first input light on the filter diaphragm 12 to the target value by rotating. . The target value is the incident angle of the first input light when the transmission wavelength of the filter film 12 is the target wavelength. Exemplarily, when the transmission wavelength of the filter film 12 is the first wavelength, the incident angle of the first input light is the first value, the first movable mirror 111 rotates at a constant speed, and the output light of the first input light is transmitted to the filter film. The angle of incidence of 12 is changed from the first value to the target value.

Optionally, the control component controls the rotation of the first movable mirror 111 to change the incident angle of the output light of the first input light on the filter film 12 from a first value to a target value.

After the incident angle changes to the target value, the first movable reflector 111 stops rotating, the first movable reflector 111 receives the first input light, and the first movable reflector 111 incidents the output light of the first input light to the filter Diaphragm 12, the incident angle is the target value.

Exemplarily, FIG. 4 provides a schematic structural diagram of another input component 11 . In the structure shown in FIG. 4 , the input assembly 11 further includes a first fixed mirror 112 . The first fixed mirror 112 is disposed on the optical path between the through input end and the first movable mirror 111 . The first movable mirror 111 is disposed on the optical path between the first fixed mirror 112 and the filter film 12 .

The first input light enters the optical add/drop multiplexer through the through input end, and then enters the first fixed mirror 112 . The first fixed mirror 112 reflects the first input light to the first movable mirror 111 . The first movable mirror 111 receives the first input light. In the process of changing the incident angle, the control component controls the rotation of the first movable mirror 111 to change the incident angle of the output light of the first input light on the filter film 12 from a first value to a target value. After the incident angle changes to the target value, the first movable mirror 111 stops rotating, and the first movable mirror 111 incidents the output light of the first input light to the filter film 12, and the incident angle is the target value.

In this way, in the structure shown in FIG. 3 and FIG. 4, the input assembly 11 includes a first movable mirror 111, which can change the incident angle of the output light of the first input light incident on the filter film 12, and realize the first The output light of the input light changes at the transmission wavelength of the filter diaphragm 12 . Moreover, after the first input light enters the optical add/drop multiplexer, it first passes through the first fixed reflector 112 instead of being directly incident on the first movable reflector 111, which can change the transmission direction of the first input light, so it can The volume of the optical add-drop multiplexer is relatively small.

Exemplarily, the input assembly 11 further includes at least one lens 114 , referring to FIG. 5 , which is a schematic structural diagram of the input assembly 11 including two lenses 114 . The two lenses 114 are disposed within the scanning range of the optical path between the first movable mirror 111 and the filter film 12 . Exemplarily, at least one lens 114 may be a convex lens, and the at least one lens 114 is used to converge the first input light. In the embodiment of the present application, the optical path scanning range is composed of multiple optical paths, and the multiple optical paths are formed by the rotation of the movable mirror.

It should be noted that, in the above-mentioned FIG. 5 , the input assembly 11 includes a movable reflector, a fixed reflector and two lenses. There are other implementations. For example, the input assembly 11 includes a plurality of movable mirrors and a lens. For another example, the input component 11 includes a movable mirror and a plurality of fixed mirrors. For another example, the input component 11 includes a movable reflector, multiple fixed reflectors, and the like.

Exemplarily, FIG. 3 provides a schematic structural diagram of the output component 14 . In the configuration shown in FIG. 3 , the output assembly 14 includes a second movable mirror 141 . The second movable mirror 141 is disposed on the optical path between the straight-through output end and the filter film 12 .

In the process of changing the incident angle, the second movable mirror 141 rotates to output the reflected light of the output light of the first input light on the filter film 12 (ie, the first reflected light) to the through output end. For example, the control component controls the second movable mirror 141 to rotate, and the second movable mirror 141 outputs the first reflected light of the output light of the first input light on the filter film 12 to the through output end. In addition, the transmission loopback component 13 outputs the first transmitted light to the second movable mirror 141 , and the second movable mirror 141 also outputs the first transmitted light to the through output end.

After the incident angle changes to the target value, the second movable mirror 141 stops rotating, and the output light of the first input light is reflected on the filter film 12 (ie, the second reflected light) to the second movable mirror 141 . The second movable mirror 141 reflects and outputs the second reflected light to the through output end. Since when the incident angle changes to the target value, the second reflected light can be output to the straight-through output port, so when the incident angle changes to the target value, the second movable mirror 141 can also output the second reflected light without rotating. to the thru output.

Exemplarily, FIG. 6 provides another schematic structural diagram of the output component 14 . In the structure shown in FIG. 6 , the output assembly 14 includes a second movable mirror 141 and a second fixed mirror 143 . The second movable mirror 141 is disposed on the optical path between the second fixed mirror 143 and the filter film 12 . The second fixed mirror 143 is disposed on the optical path between the through output end and the second movable mirror 141 .

During the change of the incident angle, the control component controls the rotation of the second movable mirror 141 , and the second movable mirror 141 reflects and outputs the first reflected light to the second fixed mirror 143 . The second fixed reflector 143 reflects and outputs the first reflected light to the through output end. After the incident angle changes to the target value, the second movable reflector 141 stops rotating, and the second movable reflector 141 reflects and outputs the second reflected light to the second fixed reflector 143, and the second fixed reflector 143 converts the second reflected light The second reflected light is reflected and output to the through output end.

In this way, the output assembly 14 includes a second movable mirror 141 , which can make the output light of the first input light reflected by the filter film 12 output to the through output end. Moreover, the output assembly 14 also includes a second fixed reflector 143, which can change the transmission direction of the reflected light, so that the volume of the optical add-drop multiplexer is relatively small.

It should be noted that, in the above-mentioned FIG. 6, the output assembly 14 includes a movable reflector and a fixed reflector, which is only an exemplary implementation. In practical applications, the output assembly 14 can also have other implementations. . For example, output assembly 14 includes a plurality of movable mirrors. For another example, the output assembly 14 includes a movable mirror and a plurality of fixed mirrors. For another example, the output assembly 14 includes a plurality of movable mirrors, a fixed mirror, and the like.

Exemplarily, in the structure shown in FIG. 3 , the transmissive loopback component 13 includes a third movable mirror 131 and a fourth movable mirror 132 . The third movable mirror 131 is disposed within the scanning range of the optical path between the filter film 12 and the fourth movable mirror 132 . The fourth movable mirror 132 is disposed within the scanning range of the optical path between the third movable mirror 131 and the filter film 12 .

During the change of the incident angle, the third movable mirror 131 rotates to reflect the output light of the first input light to the first transmitted light of the filter film 12 to the fourth movable mirror 132 . The fourth movable mirror 132 receives the first transmitted light, and outputs the first transmitted light to the output component 14 through rotation. For example, the control component controls the third movable mirror 131 to rotate, and the third movable mirror 131 reflects and outputs the first transmitted light to the fourth movable mirror 132 . The control component controls the rotation of the fourth movable mirror 132 , and the fourth movable mirror 132 reflects and outputs the first transmitted light to the filter membrane 12 . The filter film 12 transmits the first transmitted light and outputs it to the output component 14 . The output component 14 outputs the first transmitted light to the through output end.

Exemplarily, in the case where the output assembly 14 includes the second movable mirror 141 and the second fixed mirror 143, the first transmitted light is output to the direct-through output.

It should be noted here that the reason why the output light of the first input light can also be output to the straight-through output end in the first transmitted light of the filter film 12 is that the third movable mirror 131 and the fourth movable mirror 132 cooperate After the first transmitted light passes through the filter film 12 again, it overlaps with the reflected light of the first input light on the filter film 12, and the incident angle when the first transmitted light passes through the filter film 12 again is the incident angle at the time of transmission.

In this way, in the process of changing the incident angle, the first transmitted light of the output light of the first input light in the filter film 12 can also be output to the through output end, so that all the first input light is output to the through output end, reducing the first input light. loss of light.

Exemplarily, FIG. 7 shows another structure of the transmission loopback component 13 . In the structure shown in FIG. 7 , the transmissive loopback component 13 further includes a third fixed mirror 135 . The third fixed mirror 135 is disposed within the scanning range of the optical path between the fourth movable mirror 132 and the filter film 12 .

In the process of changing the incident angle, the control part controls the rotation of the third movable mirror 131, and the third movable mirror 131 reflects the output light of the first input light on the first transmitted light of the filter film 12 and outputs it to the fourth Movable mirror 132 . The control component controls the fourth movable mirror 132 to rotate, and the fourth movable mirror 132 reflects and outputs the first transmitted light to the third fixed mirror 135 . The third fixed mirror 135 reflects the first transmitted light to the filter film 12 . The filter film 12 transmits the first transmitted light and outputs it to the output component 14 . The output component 14 outputs the first transmitted light to the through output end. It should be noted here that the control component controls the third movable mirror 131 and the fourth movable mirror 132 to rotate synchronously. In this way, setting the third fixed mirror 135 changes the transmission direction of the transmitted light, so that the volume of the optical add/drop multiplexer is relatively small.

Exemplarily, after the incident angle is changed to a target value, the optical add-drop multiplexer will output the light of the lower wavelength from the transmission output port, and corresponding FIG. 8 shows the structure of the optical add-drop multiplexer. When the incident angle is changed to the target value, the transmission wavelength of the filter film 12 is the target wavelength (ie, the downwave wavelength). The output light of the first input light is transmitted through the filter film 12 (ie, the second transmitted light) and enters the third movable mirror 131 . The third movable mirror 131 rotates to output the second transmitted light to the transmission output end. For example, the control component controls the third movable mirror 131 to rotate, and the third movable mirror 131 outputs the second incident light to the transmission output end. In this way, the optical add-drop multiplexer can also output the light of the down-wavelength wavelength from the transmission output end, that is, realize down-wavelength.

Exemplarily, in the structure shown in FIG. 8 , a fourth fixed reflector 136 is optionally provided on the optical path between the third movable reflector 131 and the transmission output end. The fourth fixed mirror 136 belongs to the transmissive loopback component 13 . The second transmitted light is reflected by the third movable reflector 131 to the fourth fixed reflector 136, and the fourth fixed reflector 136 reflects the second transmitted light to the transmission output end. In this way, setting the fourth fixed reflector 136 changes the transmission direction of the second transmitted light, so that the volume of the optical add/drop multiplexer is relatively small.

Exemplarily, the transmissive loopback component 13 further includes at least one lens 114 . The lens 114 is optionally disposed between the third fixed mirror 135 and the filter film 12 , and the lens 114 is used to converge the light of the first input light on the filter film 12 to make the light spot better.

It should be noted that the transmissive loopback component 13 includes a movable reflector and a fixed reflector. The number and arrangement of the movable reflector and the fixed reflector can be set according to the actual application. In the embodiment of the present application, the number is And the arrangement method is not limited.

Exemplarily, the filter diaphragm 12 has different filter bandwidths (filter bandwidth can also be referred to as the transmission bandwidth) for the light of the same wavelength and different polarization states, in order to make the light of the same wavelength in the first input light filtered by the filter diaphragm 12 Same bandwidth, convert the first input light to single polarized light. Correspondingly, the structure of the optical add/drop multiplexer shown in FIG. 9 is provided.

In the optical add/drop multiplexer shown in FIG. 9 , the input component 11 further includes a first polarization beam splitting component 113 , and the output component 14 further includes a first polarization beam combining component 142 . Exemplarily, when the input component 11 includes the first movable mirror 111 and the first fixed mirror 112 , the first polarization beam splitting component 113 is arranged on the optical path between the through input end and the first fixed mirror 112 . Alternatively, the first polarization beam splitting component 113 is disposed on the optical path between the first movable mirror 111 and the first fixed mirror 112 .

Exemplarily, when the output assembly 14 includes the second movable mirror 141 , the first polarization beam combining assembly 142 is disposed on the optical path between the second movable mirror 141 and the through output end. Exemplarily, when the output assembly 14 includes the second movable mirror 141 and the second fixed mirror 143 , the first polarization beam combining assembly 142 is disposed on the optical path between the second fixed mirror 143 and the through output end. Alternatively, the first polarization beam combining component 142 is disposed on the optical path between the second movable mirror 141 and the second fixed mirror 143 .

When the first input light passes through the first polarization beam splitting component 113, the first polarization beam splitting component 113 performs polarization splitting on the first input light to obtain first single polarized light. The first single polarized light includes two parallel beams of the same polarization state, and the distance between the two beams of the first single polarized light is relatively narrow.

In the process of changing the incident angle, the control part controls the rotation of the first movable mirror 111, the first movable mirror 111 reflects the first single polarized light to the filter film 12, and the first single polarized light on the filter film The incident angle of 12 was changed to the target value. The control component can also control the rotation of the second movable mirror 141 , and the second movable mirror 141 outputs the first reflected light of the first single polarized light on the filter film 12 to the first polarization beam combining component 142 .

The control part also controls the transmission loop-back component 13 , and the transmission loop-back component 13 outputs the first transmitted light of the first single polarized light in the filter film 12 to the filter film 12 . The filter film 12 transmits and outputs the first transmitted light to the second movable mirror 141 . The second movable mirror 141 outputs the first transmitted light to the first polarization beam combining component 142 . Exemplarily, the control component controls the rotation of the third movable mirror 131 and the fourth movable mirror 132, so that the first transmitted light of the first single polarized light on the filter film 12 passes through the third movable mirror 131, the fourth movable mirror 131, and the fourth movable mirror 132. The four movable mirrors 132 , the filter film 12 and the second movable mirror 141 output to the first polarization beam combining component 142 .

The first polarization beam combining component 142 performs polarization beam combination on the first reflected light to obtain first polarization beam combiner light, and outputs the first polarization beam combiner light to the through output end. And the first polarization beam combining component 142 performs polarization beam combination on the first transmitted light to obtain second polarization beam combiner light, and outputs the second polarization beam combiner light to the through output end. In this way, the first input light is transformed into a single polarized light and enters the filter film 12 , so that when the first input light passes through the filter film 12 , the light filtering bandwidth for the same wavelength is the same. When finally output to the through output end, the single polarized light is converted into polarization combined light (also called double polarized light), so that the light output from the through output end is polarization combined light.

Exemplarily, the optical add/drop multiplexer also includes a transmission output end, and the transmission loopback component 13 further includes a second polarization beam combining component 133 , see FIG. 10 . The second polarization beam combiner 133 is disposed on the optical path between the third movable mirror 131 and the transmission output end. Exemplarily, in the case that the fourth fixed mirror 136 exists, the second polarization beam combining component 133 may be disposed on the optical path between the fourth fixed mirror 136 and the transmission output end.

After the incident angle is changed to the target value, the first input light is input from the through input end, and the first polarization beam splitting component 113 performs polarization splitting on the first input light to obtain the first single polarized light. The first single polarized light is output to the filter film 12 . The filter film 12 transmits and reflects the first single polarized light to obtain the second reflected light and the second transmitted light. The second reflected light is output to the first polarized beam combining component 142, and the first polarized beam combining component 142 performs polarization combining on the first reflected light to obtain the first polarized beam combining light, and outputs the first polarized beam combining light to the straight-through output. The second transmitted light is output to the third movable mirror 131 . The control component controls the rotation of the third movable mirror 131 , and the third movable mirror 131 outputs the second transmitted light of the first single polarized light through the filter film 12 to the second polarization beam combining component 133 . The second polarization beam combining component 133 performs polarization beam combining processing on the second transmitted light to obtain third polarized beam combining light, and outputs the third polarized beam combining light to the transmission output end. In this way, for the light of the target wavelength, when it enters the filter film 12 , the polarization state is the same, the filter bandwidth is the same, and the output light transmitted through the output end is also the polarization combining light.

Exemplarily, the polarization beam splitting component and the polarization beam combining component may be birefringent crystals.

Exemplarily, FIG. 11 also provides a schematic structural diagram of a polarization beam splitting component. The polarizing beam splitting component includes a polarizing beam splitting prism, a half-wave plate and a mirror. The first input light is incident to the polarization beam splitter prism and split into two beams of light with perpendicular polarization states. One of the two beams of vertically polarized light passes through a mirror, and the other beam passes through a half-wave plate to adjust the polarization state, so that the polarization states of the two beams are the same, and the two beams are parallel and the distance is relatively narrow.

Exemplarily, FIG. 12 also provides a schematic structural diagram of a polarization beam combining component. The polarization beam combining component includes a polarization beam combining prism, a half-wave plate and a mirror. The reflected light of the first single polarized light or the transmitted light of the first single polarized light both include two beams of light, the polarization states of the two beams of light are the same, and the two beams of light are parallel with a relatively narrow distance. First pass one beam of light through a mirror to change the direction of transmission to be perpendicular to the other beam. Then, one of the two beams of light passes through a half-wave plate, so that the polarization states of the two beams are vertical, and the two beams of light with vertical polarization states are combined into a polarization beam combining prism through a polarization beam combining prism.

In this way, although the input light is polarized and split into two beams of single-polarized light with the same polarization state after being polarized and split by the polarization beam-splitting component, since the two beams of single-polarized light are parallel and the distance is relatively narrow, they can be considered as one beam. Single polarized light is incident on the filter film 12 .

It should be noted that only two examples of polarization beam splitting components and polarization beam combining components are given here. In practical applications, polarization beam splitting components and polarization beam combining components can be selected according to actual needs. The embodiments of the present application do not Do limited.

Exemplarily, the different polarization states of light of the same wavelength have different filter bandwidths in the filter film 12. In order to continuously change the filter bandwidth of the first input light in the filter film 12, FIG. 13 shows another optical add/drop Schematic diagram of the multiplexer structure. In the structure shown in FIG. 13 , the optical add/drop multiplexer further includes a first movable half-wave plate 15 . The first movable half-wave plate 15 is a half-wave plate with adjustable optical axis. The first movable half-wave plate 15 is arranged on the optical path between the first polarization beam splitting assembly 113 and the filter film 12. Exemplarily, in FIG. 13 the first movable half-wave plate 15 is arranged on the first polarization splitter The optical path between the beam assembly 113 and the first movable mirror 111. The control part is connected with the first movable half-wave plate 15 . Or the first movable half-wave plate 15 is controlled according to its own preset control logic. For example, rotation etc. are performed periodically.

The control component controls the first movable half-wave plate 15 to rotate, and when the first single-polarized light passes through the first movable half-wave plate 15, the polarization state of the first single-polarized light is changed. Exemplarily, when the transmission wavelength of the filter film 12 is the target wavelength, the control component determines the rotation angle corresponding to the target wavelength, and the control component controls the first movable half-wave plate 15 to rotate the rotation angle. Here, the way for the control unit to determine the rotation angle corresponding to the target wavelength is: the control unit determines the rotation angle corresponding to the target wavelength in the correspondence between the rotation angle and the wavelength, and the correspondence can be stored in the internal memory of the control unit, or the control unit can in the accessed memory. In this way, by controlling the rotation of the first movable half-wave plate 15, the polarization state of the first single polarized light can be adjusted to realize the change of the filter bandwidth.

Exemplarily, when the optical add-drop multiplexer is used as a wavelength-dividing device, it can also serve as a multiplexer device at the same time, and the optical add-drop multiplexer also includes a wave-up input terminal, and the wave-up input terminal inputs the second input light. The second input light is light of a single wavelength, and the second input light input from the upwave input end enters the second movable mirror 141, and the second movable mirror 141 reflects the second input light to the through output end.

In this way, when the optical add-drop multiplexer is used as a wavelength-demultiplexing device, the downwave wavelength can be automatically adjusted. Moreover, in the process of automatically adjusting the wavelength of the lower wave, since the transmission loopback component 13 is provided, the reflected light and the transmitted light of the through-input light on the filter diaphragm 12 can be output from the through-through output end without causing the transmitted light to It is output from the transmission output end, so the loss of the input light passing through the input end can be reduced. Moreover, since the movable half-wave plate is provided, the filtering bandwidth of the light of the lower wavelength in the filtering diaphragm 12 can also be continuously changed.

It is worth noting that when the optical add/drop multiplexer is used as a wavelength splitting device, whether the first polarization beam splitting component 113, the first polarization beam combining component 142 and the second polarization beam combining component 133 exist during the incident angle change process There is no influence, that is, the first polarization beam splitting component 113 , the first polarization beam combining component 142 and the second polarization beam combining component 133 are not provided. Therefore, in the process of changing the incident angle, the first polarization beam splitter 113, the first polarization beam combiner 142 and the second polarization beam combiner 133 are moved out of the optical path, and after the incident angle is changed to the target value, the first polarization beam splitter The beam assembly 113, the first polarization beam combining assembly 142 and the second polarization beam combining assembly 133 move into the optical path. Of course, in order to simplify the control, after the optical add/drop multiplexer is produced, the first polarization beam splitting component 113 , the first polarization beam combining component 142 and the second polarization beam combining component 133 are always located in the optical path.

The following introduces the structure of the optical add-drop multiplexer as a multiplexer device.

Figure 14 shows the structure of an optical add/drop multiplexer as a multiplexing device. In the structure shown in Figure 14, the input assembly 11 is arranged on the optical path between the through input end and the filter diaphragm 12, the filter diaphragm 12 is arranged on the output optical path of the input assembly 11, and the output assembly 14 is arranged on the filter diaphragm 12 on the reflected optical path, and the transmissive loopback component 13 is arranged on the transmitted optical path of the filter film 12 .

The optical add-drop multiplexer includes a through input end, a through output end and a wave adding input end. Optical fibers are respectively connected to the straight-through input end, the straight-through output end and the upwave input end. The through input end is used for inputting the first input light, and the first input light is the input light transmitted by other devices. The through output port is used to output the through light to the optical fiber. The wave-up input end is used to input light of a single wavelength.

In the structure shown in FIG. 14 , the adjustment of the add wavelength of the optical add/drop multiplexer to the target wavelength is taken as an example for description. Exemplarily, assuming that the upstream wavelength of the current optical add-drop multiplexer is the first wavelength, the upstream wavelength of the optical add-drop multiplexer is adjusted from the first wavelength to the target wavelength, so that the upstream wavelength of the optical add-drop multiplexer Wavelength is the target wavelength. Or assuming that there is no add-wave input to the current optical add-drop multiplexer, adjust the add-wave wavelength of the optical add-drop multiplexer to the target wavelength. When describing the multiplexing device in the following, the adjustment of the adding wavelength of the optical add/drop multiplexer from the first wavelength to the target wavelength is taken as an example for illustration.

For the processing process in the process of adjusting the add wavelength of the optical add/drop multiplexer to the target wavelength, refer to the description of FIG. 3 , which will not be repeated here. In FIG. 14 , a dotted line with an arrow indicates that there is no upwave input light input at the upwave input end. Similarly, in FIG. 15 to FIG. 17 hereinafter, the dotted lines with arrows also indicate that there is no upwave input light input at the upwave input end. It can be seen from Fig. 14 that by changing the incident angle, the adding wavelength can be automatically adjusted. Moreover, through the transmission loopback component 13 and the output component 14, during the adjustment process of the wavelength of the upper wave, the reflected light and transmitted light of the output light of the first input light on the filter diaphragm 12 are all output to the straight-through output end instead of The transmitted light will be lost, so there will be no loss of the first input light.

Exemplarily, the optical add/drop multiplexer may change the adding wavelength when receiving the adding wavelength changing message, or may change the adding wavelength periodically.

Exemplarily, in the structure shown in FIG. 14 , the input assembly 11 includes a first movable mirror 111 , and the first movable mirror 111 is disposed on the optical path between the through input end and the filter membrane 12 . During the process of changing the incident angle and after changing to the target value, the description of the light transmission process refers to the description of FIG. 3 , which will not be repeated here.

Exemplarily, FIG. 15 provides a schematic structural diagram of another input component 11 . In the structure shown in FIG. 15 , the input assembly 11 further includes a first fixed mirror 112 . The first fixed reflector 112 is arranged on the optical path between the through input end and the first movable reflector 111, and the first movable reflector 111 is arranged on the optical path between the first fixed reflector 112 and the filter diaphragm 12 . The first input light enters the optical add/drop multiplexer through the through input end, and then enters the first fixed mirror 112 . The first fixed mirror 112 reflects the first input light to the first movable mirror 111 .

In this way, the input component 11 includes the first movable mirror 111 , which can change the incident angle of the output light of the first input light incident on the filter film 12 , and realize the change of the transmission wavelength of the first input light in the filter film 12 . Moreover, after the first input light enters the optical add-drop multiplexer, it first passes through a fixed mirror instead of directly incident on the first movable mirror 111, which can change the transmission direction of the first input light, so that the light can be Add-drop multiplexers are relatively small in size.

It should be noted that, in the above-mentioned FIG. 15 , the input assembly 11 includes a movable reflector and a fixed reflector, which is only an exemplary implementation manner. In practical applications, the input component 11 may also have other implementation manners. For example, input assembly 11 includes a plurality of movable mirrors. For another example, the input component 11 includes a movable mirror and a plurality of fixed mirrors. For another example, the input component 11 includes a movable reflector, multiple fixed reflectors, and the like.

In addition, the input assembly 11 may further include at least one lens 114 .

Exemplarily, in the structure shown in FIG. 14 , the output assembly 14 includes a second movable mirror 141 . The second movable mirror 141 is disposed on the optical path between the straight-through output end and the filter film 12 . During the change of the incident angle, the second movable mirror 141 rotates to reflect the first reflected light and the first transmitted light of the output light of the first input light on the filter film 12 to the through output end. For example, the control component controls the second movable mirror 141 to rotate, and the second movable mirror 141 reflects the first reflected light and the second transmitted light and outputs them to the through output end. After the incident angle changes to the target value, the second movable mirror 141 stops rotating, and reflects and outputs the second reflected light of the first input light on the filter film 12 to the through output end.

Exemplarily, on the basis of FIG. 14 , the output assembly 14 further includes a second fixed mirror 143 , see FIG. 16 . The second fixed reflector 143 is arranged on the optical path between the through output end and the second movable reflector 141, and the second movable reflector 141 is arranged on the optical path between the second fixed reflector 143 and the filter diaphragm 12 . For the description of the specific light transmission process, refer to the description of FIG. 6 .

In this way, the output assembly 14 includes a second movable mirror 141 , which can make the reflected light of the first input light pass through the filter film 12 output to the straight-through output end. Moreover, the output assembly 14 also includes a second fixed reflector 143, which can change the transmission direction of the reflected light, so that the volume of the optical add-drop multiplexer is relatively small.

It should be noted that, in the above-mentioned FIG. 16, the output assembly 14 includes a movable reflector and a fixed reflector, which is only an exemplary implementation. In practical applications, the output assembly 14 can also have other implementations. , which is not limited in this embodiment of the present application.

Exemplarily, the output assembly 14 may further include at least one lens 114 , and the at least one lens 114 is disposed within the scanning range of the optical path between the filter film 12 and the second movable mirror 141 . The at least one lens 114 is used for converging the first input light and the second input light mentioned later.

Exemplarily, in the structure shown in FIG. 14 , the transmissive loopback component 13 includes a third movable mirror 131 and a fourth movable mirror 132 . The third movable reflector 131 is arranged in the optical path scanning range between the filter diaphragm 12 and the fourth movable reflector 132, and the fourth movable reflector 132 is arranged between the third movable reflector 131 and the filter diaphragm 12 Within the scanning range of the optical path between.

During the change of the incident angle, the first transmitted light of the output light of the first input light is incident on the fourth movable mirror 132 through the filter film 12 . The fourth movable mirror 132 reflects and outputs the first transmitted light to the third movable mirror 131 by rotating. The third movable mirror 131 reflects and outputs the first transmitted light to the filter film 12 by rotating. For example, the control component controls the fourth movable mirror 132 to rotate, and the fourth movable mirror 132 reflects and outputs the first transmitted light to the third movable mirror 131 . The control component controls the rotation of the third movable mirror 131 , and the third movable mirror 131 reflects and outputs the first transmitted light to the filter film 12 . The filter film 12 transmits the first transmitted light and outputs it to the output component 14 . The output component 14 outputs the first transmitted light to the through output end. Here, it is necessary to control the third movable mirror 131 and the fourth movable mirror 132 to rotate synchronously. In this way, in the process of changing the incident angle, the output light of the first input light can also be output to the through output end through the transmitted light of the filter film 12, so that all the first output end is output to the through output end, without causing the first input light loss.

Exemplarily, FIG. 17 shows another structure of the transmission loopback component 13 . In the structure shown in FIG. 17 , the transmissive loopback component 13 further includes a fourth fixed mirror 136 . The fourth fixed mirror 136 is disposed within the scanning range of the optical path between the fourth movable mirror 132 and the filter film 12 .

In the process of changing the incident angle, the output light of the first input light enters the fourth fixed reflector 136 in the first transmitted light of the filter film 12, and the fourth fixed reflector 136 reflects the first transmitted light to the fourth movable reflection Mirror 132. The fourth movable mirror 132 reflects and outputs the first transmitted light to the third movable mirror 131 by rotating. The third movable mirror 131 reflects and outputs the first transmitted light to the filter film 12 by rotating. For example, the control component controls the fourth movable mirror 132 to rotate, and the fourth movable mirror 132 reflects and outputs the first transmitted light to the third movable mirror 131 . The control component controls the rotation of the third movable mirror 131 , and the third movable mirror 131 reflects and outputs the first transmitted light to the filter film 12 . The filter film 12 transmits the first transmitted light and outputs it to the output component 14 . The output component 14 outputs the first transmitted light to the through output end.

In this way, setting the fourth fixed reflector 136 changes the transmission direction of the transmitted light, so that the volume of the optical add-drop multiplexer is relatively small.

It should be noted that the number and arrangement of the movable mirrors and fixed mirrors in the transmissive loopback assembly 13 in FIG. 17 can be adjusted according to actual applications, which is not limited in this embodiment of the present application. In addition, the transmissive loopback component 13 may further include a lens 114 for converging the first input light and the like.

Exemplarily, the optical add/drop multiplexer also includes an upwave input terminal, see FIG. 18, the upwave input terminal is used to input the added light, which is called the second input light. In the embodiment of the present application, the second input The wavelength of light is the target wavelength. After the incident angle is changed to the target value, the transmission wavelength of the filter film 12 is the target wavelength. The second input light is input to the third movable mirror 131 . The control component controls the rotation of the third movable mirror 131, and the third movable mirror 131 reflects the second input light to the filter film 12, and the incident angle is a target value. The transmitted light of the second input light on the filter film 12 (referred to as the third transmitted light) is output to the output component 14 . The output component 14 outputs the third transmitted light to the through output end. The output light of the first input light is reflected by the filter film 12 (referred to as the second reflected light) and output to the output component 14, and the output component 14 outputs the second reflected light to the through output end.

In this way, the second input light is output to the straight-through output end through the third movable mirror 131 , the filter film 12 and the output assembly 14 , so that the optical add/drop multiplexer can realize adding wavelengths. Moreover, after the output light of the first input light is incident on the filter film 12, the light transmitted by the filter film 12 should be the light of the target wavelength, but the light of the target wavelength is not included in the first input light, so it is equivalent to the first input light When the output light is incident on the filter film 12, it is only reflected but not transmitted, which will not cause loss of the first input light. Here, the reason why the first input light does not include the light of the target wavelength is that the wavelength of the upwave cannot be the same as that of the through input light, and if they are the same, the data will be indistinguishable.

Exemplarily, in the structure shown in FIG. 18, a fifth fixed reflector 137 is optionally provided on the optical path between the third movable reflector 131 and the input end of the upper wave, and the fifth fixed reflector 137 belongs to the transmission Loopback component 13. The second input light is incident on the fifth fixed mirror 137 . The fifth fixed mirror 137 reflects the second input light to the third movable mirror 131 . In this way, setting the fifth fixed reflector 137 changes the transmission direction of the second input light, so that the volume of the optical add-drop multiplexer is relatively small.

Exemplarily, the filter film 12 has different filter bandwidths for light of the same wavelength and different polarization states. In order to make the light of the same wavelength in the first input light have the same filter bandwidth of the filter film 12, the first input light is converted into Single polarized light, correspondingly, provides the structure of the optical add-drop multiplexer shown in FIG. 19 .

In the optical add/drop multiplexer shown in FIG. 19 , the input component 11 further includes a first polarization beam splitting component 113 , and the output component 14 further includes a first polarization beam combining component 142 . Exemplarily, when the input component 11 includes the first movable mirror 111 and the first fixed mirror 112 , the first polarization beam splitting component 113 is arranged on the optical path between the through input end and the first fixed mirror 112 . Alternatively, the first polarization beam splitting component 113 is disposed on the optical path between the first movable mirror 111 and the first fixed mirror 112 .

Exemplarily, when the output assembly 14 includes the second movable mirror 141 , the first polarization beam combining assembly 142 is disposed on the optical path between the second movable mirror 141 and the through output end. Exemplarily, when the output assembly 14 includes the second movable mirror 141 and the second fixed mirror 143 , the first polarization beam combining assembly 142 is disposed on the optical path between the second fixed mirror 143 and the through output end. Alternatively, the first polarization beam combining component 142 is disposed on the optical path between the second movable mirror 141 and the second fixed mirror 143 .

When the first input light passes through the first polarization beam splitting component 113, the first polarization beam splitting component 113 performs polarization splitting on the first input light to obtain first single polarized light.

During the process of changing the incident angle, refer to the description of FIG. 9 for the description of the light transmission process, which will not be repeated here.

Exemplarily, the transmissive loopback component 13 further includes a second polarization beam splitting component 134 , referring to FIG. 19 , the second polarization beam splitting component 134 is arranged on the optical path between the upper wave input end and the third movable mirror 131 . Exemplarily, in the case that the fifth fixed mirror 137 exists, the second polarization beam splitting component 134 is arranged on the optical path between the upper wave input end and the fifth fixed mirror 137 .

After the incident angle is changed to the target value, the first input light does not include light of the target wavelength, the first input light is input from the through input end, and the first polarization beam splitting component 113 performs polarization splitting on the first input light to obtain the first input light A single polarized light. The first single polarized light is output to the filter film 12 . The filter film 12 reflects the first single polarized light to obtain the second reflected light. The second reflected light passes through the second movable mirror 141 and is output to the first polarization beam combining component 142. The first polarization beam combining component 142 pairs The two reflected lights are polarized and combined, and output to the through output end.

The second input light is input from the wave-up input end and enters the second polarization beam splitting component 134 . The second polarization beam splitting component 134 performs polarization splitting on the second input light to obtain second single polarized light. The second polarization beam splitting component 134 outputs the second single polarized light to the third movable mirror 131 . The second single polarized light is two parallel beams of light with the same polarization state, and the distance between the two beams of light included in the second single polarized light is relatively narrow. The control part controls the rotation of the third movable reflector 131, the third movable reflector 131 reflects the second input light to the filter film 12, and the incident angle is the target value, at this time the filter film 12 transmits the second single polarized light , to obtain the third transmitted light. In this way, the second single polarized light is output to the first polarization beam combining assembly 142 through the third movable mirror 131 , the filter film 12 and the second movable mirror 141 . The first polarization beam combining component 142 performs polarization beam combination on the third transmitted light to obtain fourth polarization beam combiner light, and outputs the fourth polarization beam combiner light to the through output end.

In this way, the light of the target wavelength input at the upwave input end can also undergo polarization splitting and polarization combining, so that the output is not affected, and the filtering bandwidth of the filter diaphragm 12 is not affected by the polarization state.

It should be noted here that after the incident angle is changed to the target value, the first input light does not include the light of the target wavelength, so the first input light is not transmitted through the filter film 12 . The presence or absence of the first polarizing beam splitting component 113 will not affect the transmission of the first input light in the filter film 12, but the first polarizing beam splitting component 113 is still provided because: when the first input light passes through to the final output, there will be Polarization beam combining is performed through the first polarization beam combining component 142 , so polarization beam splitting must be performed before passing through this.

Exemplarily, the different polarization states of light of the same wavelength have different filter bandwidths in the filter film 12. In order to continuously change the filter bandwidth of the second input light in the filter film 12, FIG. 20 shows another optical add/drop Schematic diagram of the multiplexer structure. In the structure shown in FIG. 20 , the optical add/drop multiplexer further includes a second movable half-wave plate 16 . The second movable half-wave plate 16 is disposed on the optical path between the second polarization beam splitting assembly 134 and the third movable mirror 131 .

The control component controls the second movable half-wave plate 16 to rotate, and when the second single-polarized light passes through the second movable half-wave plate 16, the polarization state of the second single-polarized light is changed. Exemplarily, when the transmission wavelength of the filter film 12 is the target wavelength, the control component determines the rotation angle corresponding to the target wavelength, and the control component controls the second movable half-wave plate 16 to rotate the rotation angle. Here, the way for the control unit to determine the rotation angle corresponding to the target wavelength is: the control unit determines the rotation angle corresponding to the target wavelength in the correspondence between the rotation angle and the wavelength, and the correspondence can be stored in the internal memory of the control unit, or the control unit can in the accessed memory. In this way, by controlling the rotation of the second movable half-wave plate 16, the polarization state of the second single polarized light can be adjusted, and the filter bandwidth can be adjusted.

In this way, when the optical add/drop multiplexer is used as a multiplexing device, the adding wavelength can be changed automatically. Moreover, in the process of automatically changing the wavelength of the upper wave, since the transmissive loopback component 13 is provided, the reflected light and the transmitted light of the through-input light on the filter diaphragm 12 can be output from the through-through output end without causing the transmitted light to Loss, so the loss of the input light passing through the input end can be reduced. Moreover, since the movable half-wave plate is provided, the polarization state of the up-wave input light can be continuously changed by controlling the movable half-wave plate, and thus the filtering bandwidth of the up-wave input light in the filter diaphragm 12 can be continuously changed.

It should be noted that when the optical add/drop multiplexer is used as a wave splitting device or a wave combining device, in the process of changing the incident angle, while the control part controls the rotation of the first movable mirror 111, the control part controls the second movable mirror 111 to rotate. The mirror 141, the third movable mirror 131, and the fourth movable mirror 132 rotate synchronously. The speed, direction and amplitude for controlling the rotation of each movable mirror can be pre-configured, and the control unit can control each movable mirror by reading the pre-stored speed and direction. For example, the control unit controls the first movable mirror 111 to rotate counterclockwise at a constant speed by 1 degree, and the control unit controls the second movable mirror 141, the third movable mirror 131, and the fourth movable mirror 132 to rotate clockwise by 1 degree at a constant speed. Spend. After the incident angle is changed to the target value, the first movable reflector 111 and the second movable reflector 141 have been rotated to the corresponding positions, and there is no need to rotate, and the control part follows the rotation rate of the third movable reflector 131 , direction and amplitude to control the third movable mirror 131 .

It is worth noting that, in the process of changing the incident angle, the existence of the first polarization beam splitting component 113, the first polarization beam combining component 142 and the second polarization beam splitting component 134 has no effect, that is, the first polarization beam splitting component is not set. The component 113 , the first polarization beam combining component 142 and the second polarization beam splitting component 134 are also available. Therefore, in the process of changing the incident angle, the first polarization beam splitting component 113, the first polarization beam combining component 142 and the second polarization beam splitting component 134 are moved out of the optical path, and after the incident angle is changed to the target value, the first polarization beam splitting component The beam assembly 113, the first polarization beam combining assembly 142 and the second polarization beam splitting assembly 134 move into the optical path. Of course, in order to simplify the control, after the optical add/drop multiplexer is produced, the first polarization beam splitting component 113 , the first polarization beam combining component 142 and the second polarization beam splitting component 134 are always located in the optical path.

The optical add-drop multiplexer of the second principle is described below.

The optical add/drop multiplexer includes a first input component 21 , a total reflection film 22 , at least one first filter film 23 and a first output component 24 .

Optionally, the total reflection diaphragm 22 and the at least one first filter diaphragm 23 can be arranged separately or integrated together. When integrated together, it is equivalent to the total reflection membrane 22 and at least one first filter membrane 23 forming a spliced membrane, in which the total reflection membrane 22 is parallel to each first filter membrane 23 .

Exemplarily, when the total reflection diaphragm 22 and at least one first filter diaphragm 23 form a spliced diaphragm, the total reflection diaphragm 22 and at least one first filter diaphragm 23 are stacked side by side, and the total reflection diaphragm 22 The surfaces of each first filter membrane 23 are not overlapped, and the surfaces of any two first filter membranes 23 are not overlapped. Here, the surface is the incident surface or the outgoing surface of light, that is, the surface perpendicular to the thickness direction, and the side surface is the surface of the total reflection film 22 and the first filter film 23 in the thickness direction. Exemplarily, the total reflection diaphragm 22 is parallel to each first filter diaphragm 23 , but not located on the same plane. Alternatively, the total reflection diaphragm 22 is parallel to each first filter diaphragm 23 and located on the same plane.

Exemplarily, the total reflection film 22 is a film capable of reflecting light of all wavelengths involved in the embodiment of the present application. The filtering bandwidth of each first filtering membrane 23 is different. For example, at least one first filter membrane 23 is two filter membranes, and the filter bandwidths are 100G and 200G respectively. In the embodiment of the present application, there is no limitation on the arrangement of the total reflection membrane 22 and the first filter membrane 23 in the spliced membrane. For example, the total reflection diaphragm 22 is located on the left side or the right side of at least the first first filter diaphragm 23 , or between any two first filter diaphragms 23 . In the embodiment of the present application, the spliced diaphragm composed of the total reflection diaphragm 22 and at least one first filter diaphragm 23 is taken as an example for illustration. In the illustrations below, spliced diaphragms are taken as an example for illustration.

Exemplarily, the first input component 21 , the total reflection film 22 , at least one first filter film 23 and the first output component 24 cooperate with each other to implement the function of an optical add-drop multiplexer. When cooperating with each other, the first input component 21 , the full reflection diaphragm 22 , at least one first filter diaphragm 23 and the first output component 24 are independently controlled according to certain rules. For example, the first input component 21 , the full-reflection diaphragm 22 , at least one first filter diaphragm 23 and the first output component 24 respectively execute preset logic periodically to achieve mutual cooperation and the like. Or, when cooperating with each other, they are controlled by a control part.

Exemplarily, the control component is integrated with any one of the first input assembly 21 , the full reflection diaphragm 22 , at least one first filter diaphragm 23 and the first output assembly 24 . For example, the control component is disposed inside the first input assembly 21 as a separate controller, or is disposed in the first movable mirror 111 included in the first input assembly 21 . Alternatively, the control unit is an independent device inside the optical add-drop multiplexer.

The control components are respectively connected with the first input assembly 21 , the full reflection membrane 22 , at least one first filter membrane 23 and the first output assembly 24 . Exemplarily, the connection may be an electrical connection.

In the embodiment of the present application, the control part is used to control the first input assembly 21 , the full reflection diaphragm 22 , at least one first filtering diaphragm 23 and the first output assembly 24 as an example for illustration.

The following describes the structure of the optical add-drop multiplexer as a wave-division device.

As mentioned above, the optical add/drop multiplexer includes a through input end, a through output end and a transmission output end. The first input component 21 is arranged on the optical path between the straight-through input end and the spliced diaphragm, and the spliced diaphragm is arranged on the output optical path of the first input component 21 .

Figure 21 shows the structure of an optical add/drop multiplexer as a wavelength division device. In the structure shown in FIG. 21 , the adjustment of the drop wavelength of the optical add/drop multiplexer to the target wavelength is taken as an example for description. In the process of adjusting the downstream wavelength of the optical add/drop multiplexer to the target wavelength, the all-reflection diaphragm 22 moves into the output optical path of the first input assembly 21 (this step is performed when the all-reflection diaphragm 22 is not on the output optical path ), the first input light is input from the through input end. The first input component 21 outputs the first input light to the total reflection film 22, and changes the incident angle of the output light of the first input light on the total reflection film 22 to a target value, as mentioned above, the target value corresponds to the target wavelength . For example, the control unit controls the movement of the spliced diaphragm, and moves the total reflection diaphragm 22 into the output optical path of the first input component 21 . The control component controls the first input component 21 to output the output light of the first input light to the total reflection film 22 , and changes the incident angle of the output light of the first input light on the total reflection film 22 to a target value. The output light of the first input light is the output light of the first input light through the first input component 21 .

The first output component 24 directly outputs the reflected light output by the total reflection film 22 , that is, outputs it to the through output end. For example, the control unit controls the first output assembly 24, and the first output assembly 24 outputs the reflected light output by the full reflection film 22 to the through output end. It should be noted here that the output light of the first input light has no transmitted light on the total reflection film 22. In FIG. , the dashed line with an arrow also indicates that there is no light output from the transmitted output. Since the total reflection film 22 is parallel to the first filter film 23 , it is equivalent to adjusting the incident angle of the first input light on the first filter film 23 .

After the incident angle is changed to the target value, the transmission wavelength of the first filter film 23 is the target wavelength, and a certain first filter film 23 (hereinafter referred to as the target filter film) is moved into the output optical path of the first input component 21 , the total reflection diaphragm 22 is moved out of the output optical path. For example, the control unit controls the splicing diaphragm to move, and the target filter diaphragm is moved into the output optical path of the first input assembly 21, and the total reflection diaphragm 22 is moved out of the output optical path, and the target filter diaphragm is moved into the total reflection diaphragm 22 It was originally at the position of the output light path. The target filter film is the first filter film 23 corresponding to the target wavelength. The filter bandwidth of the target filter diaphragm is the same as the filter bandwidth required by the target wavelength. The first input light is reflected to the target filter film through the first input component 21 . The target filter film transmits the light of the target wavelength in the output light of the first input light, and reflects the light of other wavelengths. The reflected light of the first input light is output to the first output component 24 for through output (that is, output to the through output end), and the transmitted light of the first input light is output to the first output component 24 for transmission output (that is, output to the through output end). output). It should be noted here that selecting the target filter film based on the target wavelength can make the filter bandwidth required by the target wavelength close to the filter bandwidth of the target filter film, so that the performance of the optical add-drop multiplexer is better.

In this way, in the process of changing the incident angle, the wavelength of the downwave can be automatically adjusted, and the total reflection film 22 is set so that the input light will not be lost.

Exemplarily, in the structure shown in FIG. 21 , the first input component 21 includes a first movable mirror 111 , and the first movable mirror 111 is arranged on the optical path between the through input end and the spliced film. During the change of the incident angle, the first movable mirror 111 receives the first input light. By rotating the first movable mirror 111 , the incident angle of the output light of the first input light on the total reflection film 22 is changed to a target value. Exemplarily, the control component controls the first movable mirror 111 to rotate, and the first movable mirror 111 changes the incident angle of the output light of the first input light on the total reflection film 22 to a target value. For example, the control component can control the first movable mirror 111 to rotate at a constant speed, so as to change the incident angle of the output light of the first input light on the total reflection film 22 to a target value. After the incident angle changes to the target value, the first movable reflector 111 stops rotating, and the target filter film moves into the output light path of the first input assembly 21, and the first movable reflector 111 receives the first input light, and the first The output light of the input light is incident on the target filter film. Since the target filter film is parallel to the total reflection film 22 , the incident angle at which the output light of the first input light enters the target filter film is the target value.

Exemplarily, FIG. 22 provides another schematic structural view of the first input component 21 . In the structure shown in FIG. 22 , the first input component 21 further includes a first fixed mirror 112 . The first fixed reflector 112 is disposed on the optical path between the through input end and the first movable reflector 111 , and the first movable reflector 111 is disposed on the optical path between the first fixed reflector 112 and the spliced film.

The first input light enters the optical add/drop multiplexer through the through input end, and then enters the first fixed mirror 112 . The first fixed mirror 112 reflects the first input light to the first movable mirror 111 .

In this way, in the structure shown in FIG. 21 and FIG. 22 , the first input component 21 includes a first movable mirror 111, which can change the incident angle of the first input light incident on the total reflection film 22, and realize the first The input light changes in the transmitted wavelength of the target filter diaphragm. Moreover, after the first input light enters the optical add/drop multiplexer, it first passes through the first fixed reflector 112 instead of being directly incident on the first movable reflector 111, which can change the transmission direction of the first input light, so it can The volume of the optical add-drop multiplexer is relatively small.

Exemplarily, the first input assembly 21 further includes at least one lens 114 , and FIG. 23 is a schematic structural diagram of the first input assembly 21 including at least one lens 114 . At least one lens 114 is disposed within the scanning range of the optical path between the first movable mirror 111 and the spliced film. At least one lens 114 is a convex lens, and the at least one lens 114 is used for converging the first input light.

It should be noted that the structure of the first input assembly 21 described above is only an exemplary structure, and the embodiment of the present application does not make any limitation on the number of movable mirrors, fixed mirrors and lenses included in the first input assembly 21. limited.

Exemplarily, the first output component 24 includes a first sub-output component 241 and a second sub-output component 242 , see FIG. 24 . The first sub-output assembly 241 is disposed on the optical path between the total reflection film 22 (or the target filter film) and the straight-through output end. The second sub-output assembly 242 is disposed on the optical path between the total reflection film 22 (or the target filter film) and the transmission output end.

In the process of changing the incident angle, the first sub-output assembly 241 receives the reflected light of the output light of the first input light on the total reflection film 22 , reflects and outputs the reflected light to the through output end. After the incident angle is changed to the target value, the first sub-output component 241 receives the reflected light of the output light of the first input light on the target filter, and outputs the reflected light to the through output end. The second sub-output component 242 receives the transmitted light of the output light of the first input light on the target filter film. The control part controls the second sub-output assembly 242, and the second sub-output assembly 242 outputs the transmitted light to the transmission output terminal.

Exemplarily, in the structure shown in FIG. 24, the first sub-output assembly 241 includes a second movable mirror 141, and the second movable mirror 141 is arranged on the optical path between the target filter film and the through output end .

During the change of the incident angle, the second movable mirror 141 is rotated to reflect the output light of the first input light on the total reflection film 22 and output it to the straight-through output end. For example, the control component controls the second movable mirror 141 to rotate, and the second movable mirror 141 reflects the output light of the first input light to the reflected light of the full reflection film 22 and outputs it to the through output end. In this way, since the rotation of the first movable mirror 111 will cause the transmission direction of the reflected light to change, the rotation of the second movable mirror 141 should cooperate with the first movable mirror 111 .

After the incident angle changes to the target value, the second movable mirror 141 stops rotating. The second movable mirror 141 receives the reflected light of the output light of the first input light at the target filter film, and reflects the output light of the first input light at the target filter film to reflect and output it to the through output port.

Exemplarily, in the structure shown in FIG. 24 , the second sub-output assembly 242 includes a third movable mirror 131, and the third movable mirror 131 is arranged on the optical path between the target filter film and the transmission output end . After the incident angle is changed to the target value, the output light of the first input light is output to the third movable mirror 131 through the transmitted light of the target filter film. The third movable mirror 131 is rotated to reflect the transmitted light and output it to the transmission output end. For example, the control component controls the third movable mirror 131 to rotate, and the third movable mirror 131 reflects the transmitted light and outputs it to the transmission output end.

Exemplarily, on the basis of FIG. 24 , the second sub-output assembly 242 further includes a second fixed mirror 143 , see FIG. 25 . The second fixed reflector 143 is arranged on the optical path between the third movable reflector 131 and the transmission output end, and the third movable reflector 131 is arranged on the optical path between the second fixed reflector 143 and the target filter film . After the incident angle is changed to the target value, the output light of the first input light is output to the third movable mirror 131 through the transmitted light of the target filter film. The control component controls the rotation of the third movable mirror 131 , and the third movable mirror 131 reflects and outputs the transmitted light to the second fixed mirror 143 . The second fixed mirror 143 reflects and outputs the transmitted light to the transmission output end.

It should be noted that the structures of the first sub-output component 241 and the second sub-output component 242 described above are only exemplary structures. The embodiment of the present application does not limit the number of movable mirrors included in the first sub-output assembly 241 . For example, the first sub-output component 241 can be realized by using multiple movable mirrors, or can be realized by using one movable mirror and one fixed mirror. The embodiment of the present application does not limit the number of movable mirrors and fixed mirrors included in the second sub-output assembly 242 . For example, the second sub-output component 242 can be realized by using a plurality of movable mirrors and a plurality of fixed mirrors.

Exemplarily, the target filter film has different filter bandwidths for light of the same wavelength and different polarizations. In order to make the light of the same wavelength in the first input light have the same filter bandwidth of the target filter film, the first input light is converted into a single The polarized light, accordingly, provides the structure of the optical add-drop multiplexer shown in FIG. 26 .

In the optical add/drop multiplexer shown in Figure 26, the first input assembly 21 also includes a first polarization beam splitting assembly 113, the first sub-output assembly 241 also includes a first polarization beam combining assembly 142, and the second sub-output assembly 242 also includes a second polarization beam combiner 133 .

Exemplarily, when the first input component 21 includes the first movable reflector 111 and the first fixed reflector 112, the first polarization beam splitting component 113 is arranged to pass through the light between the input end and the first fixed reflector 112 on the way.

Exemplarily, when the first sub-output assembly 241 includes the second movable mirror 141 , the first polarization beam combining assembly 142 is disposed on the optical path between the second movable mirror 141 and the through output end.

Exemplarily, when the second sub-output assembly 242 includes the third movable mirror 131 and the second fixed mirror 143, the second polarization beam combining assembly 133 is arranged between the third movable mirror 131 and the transmission output end on the light path. For example, the second polarization beam combining component 133 is disposed on the optical path between the second fixed mirror 143 and the transmission output end.

It should be noted that when the total reflection film 22 is located in the output optical path of the first input component 21, whether the first polarizing beam splitting component 113, the first polarizing beam combining component 142 and the second polarizing beam combining component 133 exist has no influence , that is, the first polarization beam splitting component 113 , the first polarization beam combining component 142 and the second polarization beam combining component 133 are not provided. Therefore, the control unit can move the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142 and the second polarization beam combining assembly 133 out of the optical path when the total reflection film 22 is located in the output optical path of the first input assembly 21, and When the target filter film is located in the output optical path of the first input assembly 21 , the first polarization beam splitting assembly 113 , the first polarization beam combining assembly 142 and the second polarization beam combining assembly 133 are moved into the optical path. Of course, in order to simplify the control, it is also possible not to move. When the total reflection film 22 or the target filter film is located in the output light path of the first input assembly 21, the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142 and the second polarization beam combining component 133 are in the optical path.

Here, the target filter film is located in the output light path of the first input component 21 as an example for illustration (when the total reflection film 22 is located in the output light path, there is only no transmitted light). After the incident angle is changed to the target value, when the first input light passes through the first polarization beam splitting component 113 , the first polarization beam splitting component 113 performs polarization splitting on the first input light to obtain the first single polarized light. The first movable mirror 111 reflects the first single polarized light to the target filter film. The target filter diaphragm transmits and reflects the first single polarized light. The reflected light of the first single polarized light is output to the second movable mirror 141 , and the second movable mirror 141 reflects and outputs the reflected light to the first polarization beam combining component 142 . The first polarization beam combining component 142 performs polarization beam combination on the reflected light to obtain first polarization beam combiner light, and outputs the first polarization beam combiner light to the through output end.

The transmitted light of the first single polarized light is output to the third movable mirror 131 . The control component controls the rotation of the third movable mirror 131 , and the third movable mirror 131 reflects the transmitted light and outputs it to the second polarization beam combining assembly 133 . The second polarization beam combining component 133 performs polarization beam combining on the transmitted light to obtain second polarized beam combiner light, and outputs the second polarized beam combiner light to the transmission output end.

In this way, the first input light is transformed into a single polarized light and enters the target filter film, so that when the first input light passes through the target filter film, the light filtering bandwidth for the same wavelength is the same. When finally output to the through output end, the single polarized light is converted into polarization combined light, so that the light output from the through output end is the polarization combined light. When finally output to the transmission output end, the single polarized light is converted into polarization combined light, so that the light output from the transmission output end is polarization combined light.

Exemplarily, the different polarization states of light of the same wavelength have different filter bandwidths in the filter film. In order to continuously change the filter bandwidth of the output light of the first input light in the target filter film, the optical add-drop multiplexer further includes a second A movable half-wave plate 15. The first movable half-wave plate 15 is disposed on the optical path between the first polarization beam splitting component 113 and the target filter film. The control part is connected with the first movable half-wave plate 15 . Optionally, when the total reflection diaphragm 22 is on the output optical path of the first input assembly 21, the first movable half-wave plate 15 can be moved out of the optical path, and when the target filter diaphragm is on the output optical path, the first movable half-wave plate 15 can move out of the optical path. The wave plate 15 moves into the optical path again.

The control component controls the first movable half-wave plate 15 to rotate, and when the first single-polarized light passes through the first movable half-wave plate 15, the polarization state of the first single-polarized light is changed. Exemplarily, when the transmission wavelength of the target filter film is the target wavelength, the control component determines the rotation angle corresponding to the target wavelength, and the control component controls the first movable half-wave plate 15 to rotate the rotation angle. Here, the way for the control unit to determine the rotation angle corresponding to the target wavelength is: the control unit determines the rotation angle corresponding to the target wavelength in the correspondence between the rotation angle and the wavelength, and the correspondence can be stored in the internal memory of the control unit, or the control unit can in the accessed memory. In this way, by controlling the rotation of the first movable half-wave plate 15, the polarization state of the first single polarized light can be adjusted to realize continuous change of the filter bandwidth.

In this way, in the process of adjusting the downstream wavelength, the total reflection diaphragm 22 moves into the output optical path of the first input assembly 21, and the first input light incident on the total reflection diaphragm 22 is completely reflected and output to the straight-through output end, which can not only automatically The downwave wavelength is adjusted, and the loss of the first input light can be reduced. And after the downstream wavelength is adjusted to the target wavelength, the target filter film moves into the output optical path of the first input assembly 21, the first input light is incident on the target filter film, and the light of the target wavelength in the first input light passes through the target filter film transmitted, output to the transmitted output end, and light of other wavelengths in the first input light is reflected by the target filter film, output to the through output end, for reception by other devices.

The following describes the structure of an optical add/drop multiplexer as a multiplexer.

Fig. 27 shows the structure of an optical add/drop multiplexer as a multiplexing device. In the structure shown in FIG. 27 , the optical add/drop multiplexer includes a first input component 21 , a total reflection film 22 , at least one first filter film 23 and a first output component 24 . For the structure shown in FIG. 27 , refer to the description of FIG. 21 , and details will not be repeated here. In addition, in FIG. 27 , a dotted line with an arrow indicates that there is no upwave input light input at the upwave input end.

As mentioned above, the optical add/drop multiplexer includes a through-input end, a through-through output end and an add-wave input end.

Exemplarily, in the structure shown in FIG. 28 , the first input component 21 includes a first sub-input component 211 and a second sub-input component 212 . The first sub-input assembly 211 is arranged on the optical path between the straight-through input end and the spliced diaphragm, and the second sub-input assembly 212 is arranged on the optical path between the upwave input end and the spliced diaphragm.

Exemplarily, in the structure shown in FIG. 28 , it is described by taking the adjustment of the add wavelength of the optical add/drop multiplexer from the first wavelength to the target wavelength as an example. In the process of adjusting the adding wavelength of the optical add/drop multiplexer to the target wavelength, the adjustment of the adding wavelength is realized by adjusting the incident angle. As mentioned above, the incident angle is the target value corresponding to the target wavelength.

During the change of the incident angle, the total reflection film 22 moves into the output light path of the first sub-input assembly 211 . For example, the control part controls the movement of the spliced diaphragm, and moves the total reflection diaphragm 22 into the output optical path of the first sub-input assembly 211 . The first input light is input through the input end, the first sub-input component 211 receives the first input light, outputs the output light of the first input light to the total reflection film 22 , and changes the incident angle to a target value. The total reflection film 22 fully reflects the output light of the first input light to the first output component 24 . The first output component 24 reflects the light reflected by the total reflection film 22 and outputs it to the through output end. For example, this process is realized by synchronously controlling the first sub-input assembly 211 and the first output assembly 24 by the control unit.

After the incident angle is changed to the target value, the first input light does not include the light of the target wavelength, and the second input light is input to the upwave input end, and the wavelength of the second input light is the target wavelength. The control part controls the movement of the spliced diaphragms, and moves the target filter diaphragm of at least one first filter diaphragm 23 into the output optical path of the first sub-input assembly 211 , and the target filter diaphragm is the first filter diaphragm 23 corresponding to the target wavelength. The target filter film fully reflects the first input light, and the reflected light of the first input light is output to the first output component 24 . The control component controls the second sub-input assembly 212, and the second sub-input assembly 212 outputs the output light of the second input light to the target filter film, and the incident angle is a target value. At this time, the target filter film transmits the second input light, and the transmitted light of the second input light is output to the first output component 24 . The first output component 24 outputs the transmitted light and the reflected light of the first input light to the through output end.

Exemplarily, in the structure shown in FIG. 28 , the first sub-input assembly 211 includes a first movable mirror 111 , and the first movable mirror 111 is disposed on the optical path between the through input end and the spliced diaphragm. In the process of changing the incident angle, the control unit controls the first movable mirror 111 to rotate, and the first movable mirror 111 changes the incident angle of the output light of the first input light on the total reflection film 22 to a target value. Exemplarily, the control component can control the first movable mirror 111 to rotate at a constant speed, so as to change the incident angle of the output light of the first input light on the total reflection film 22 to a target value. After the incident angle changes to the target value, the first movable mirror 111 stops rotating, and the first movable mirror 111 incidents the output light of the first input light to the target filter film, and the incident angle is the target value.

Exemplarily, in the structure shown in FIG. 28, the second sub-input component 212 includes a third movable mirror 131, and the third movable mirror 131 is arranged on the optical path between the upper wave input end and the spliced diaphragm . After the incident angle is changed to the target value, the second input light is input from the upwave input end, and the third movable mirror 131 receives the second input light. The control component controls the rotation of the third movable mirror 131, and the third movable mirror 131 reflects and outputs the second input light to the target filter film, and the incident angle is a target value. The target filter film completely transmits the second input light and outputs it to the first output component 24 .

Exemplarily, the second sub-input assembly 212 further includes a third fixed mirror 135, see FIG. 28 . The third fixed reflector 135 is arranged on the optical path between the third movable reflector 131 and the upper wave input end, and the third movable reflector 131 is arranged on the optical path between the third fixed reflector 135 and the spliced diaphragm . The second input light is incident to the third fixed mirror 135 . The third fixed mirror 135 reflects the second input light to the third movable mirror 131 . The control component controls the rotation of the third movable mirror 131, and the third movable mirror 131 makes the second input light incident to the target filter film, and the incident angle is a target value. The transmitted light of the second input light after passing through the target filter film is transmitted to the first output component 24 . The first output component 24 outputs the transmitted light to a through output terminal. In this way, the wave adding function is realized.

In this way, in the structure shown in FIG. 28 , the first sub-input component 211 includes a first movable mirror 111, which can change the incident angle of the first input light incident on the target filter film, and realize the first input light at The transmission wavelength adjustment of the target filter diaphragm. The second sub-input component 212 includes a third movable mirror 131, which can realize the adjustment of the wavelength of the up-wavelength.

It should be noted that the structure of the first sub-input component 211 and the second sub-input component 212 described above is only an exemplary structure. The embodiment of the present application does not limit the number of movable mirrors included in the first sub-input component 211 . For example, the first sub-input component 211 can be realized by using a plurality of movable mirrors. For another example, the first sub-input component 211 may be implemented by using multiple movable mirrors and multiple fixed mirrors. The embodiment of the present application does not limit the number of movable mirrors and fixed mirrors included in the second sub-input assembly 212 . For example, the second sub-input component 212 can be realized by using multiple movable mirrors and multiple fixed mirrors.

Exemplarily, the first output assembly 24 includes a second movable mirror 141 , referring to FIG. 27 , the second movable mirror 141 is disposed on the optical path between the spliced diaphragm and the straight-through output end.

During the change of the incident angle, the control unit controls the rotation of the second movable mirror 141, and the second movable mirror 141 reflects the reflected light of the first input light on the total reflection film 22 and outputs it to the through output end. In this way, since the rotation of the first movable reflector 111 will cause the transmission direction of the reflected light of the first input light on the total reflection film 22 to change, the rotation of the second movable reflector 141 will be consistent with the first movable reflector. Mirror 111 fits.

After the incident angle changes to the target value, the second movable mirror 141 stops rotating, and the second movable mirror 141 outputs the reflected light of the first input light on the target filter film to the through output port. If there is a second input light at the upwave input end, the second movable mirror 141 outputs the transmitted light of the second input light on the target filter film to the through output end.

Exemplarily, the first output component 24 further includes a second fixed mirror 143, see FIG. 28 . The second fixed mirror 143 is disposed on the optical path between the second movable mirror 141 and the through output end. During the change of the incident angle, the control part controls the rotation of the second movable reflector 141, and the second movable reflector 141 outputs the reflected light of the output light of the first input light on the total reflection film 22 to the second fixed reflector 141. Mirror 143. The second fixed mirror 143 reflects the light reflected by the second movable mirror 141 to the through output end. After the incident angle changes to the target value, the second movable mirror 141 outputs the reflected light of the first input light on the target filter film to the second fixed mirror 143 . The second fixed reflector 143 reflects the reflected light to the through output end. If there is a second input light at the upwave input end, the second movable reflector 141 reflects the transmitted light of the second input light on the target filter film to the second fixed reflector 143 . The second fixed reflector 143 reflects the transmitted light to the through output end.

Exemplarily, the first output component 24 further includes at least one lens 114 , referring to FIG. 29 , the at least one lens 114 is disposed within the scanning range of the optical path between the second movable mirror 141 and the spliced film. At least one lens 114 is a convex lens, and the at least one lens 114 is used for converging the first input light and converging the second input light.

It should be noted that the structure of the first output component 24 described above is only an exemplary structure, and the embodiment of the present application does not make any limitation on the number of movable mirrors, fixed mirrors and lenses included in the first output component 24. limited.

Exemplarily, the target filter film has different filter bandwidths for light of the same wavelength and different polarizations. In order to make the light of the same wavelength in the first input light have the same filter bandwidth of the target filter film, the first input light is converted into a single The polarized light, accordingly, provides the structure of the optical add-drop multiplexer shown in FIG. 30 .

In the optical add/drop multiplexer shown in Figure 30, the first sub-input assembly 211 includes a first polarization beam splitting assembly 113, the first output assembly 24 also includes a first polarization beam combining assembly 142, and the second sub-input assembly 212 A second polarization beam splitting component 134 is also included.

Exemplarily, when the first sub-input component 211 includes the first movable mirror 111 , the first polarization beam splitting component 113 is disposed on the optical path between the through input end and the first movable mirror 111 .

Exemplarily, when the second output assembly 24 includes the second movable mirror 141 , the first polarization beam combining assembly 142 is disposed on the optical path between the second movable mirror 141 and the through output end.

Exemplarily, when the second sub-input component 212 includes the third movable mirror 131 , the second polarization beam splitting component 134 is arranged on the optical path between the upwave input end and the third movable mirror 131 . When the second sub-input component 212 includes the third movable mirror 131 and the third fixed mirror 135 , the second polarization beam splitting component 134 is arranged on the optical path between the upwave input end and the third fixed mirror 135 .

It should be noted that when the all-reflection film 22 is located in the output light path of the first input component 21, the presence or absence of the first polarizing beam splitting component 113, the first polarizing beam combining component 142 and the second polarizing beam splitting component 134 has no influence , that is, the first polarizing beam splitting component 113 , the first polarizing beam combining component 142 and the second polarizing beam splitting component 134 are not provided. Therefore, the control unit can move the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142 and the second polarization beam splitting assembly 134 out of the optical path when the total reflection film 22 is located in the output optical path of the first input assembly 21, and When the target filter film is located in the output optical path of the first input assembly 21 , the first polarization beam splitting assembly 113 , the first polarization beam combining assembly 142 and the second polarization beam splitting assembly 134 are moved into the optical path. Of course, in order to simplify the control, it is also possible not to move. When the total reflection film 22 or the target filter film is located in the output light path of the first input assembly 21, the first polarization beam splitting assembly 113, the first polarization beam combining assembly 142 and the second polarization beam splitting component 134 are located in the optical path.

Here, the target filter film is located in the output light path of the first input component 21 as an example for illustration (when the total reflection film 22 is located in the output light path, there is only no transmitted light). After the incident angle is changed to the target value, when the first input light passes through the first polarization beam splitting component 113 , the first polarization beam splitting component 113 performs polarization splitting on the first input light to obtain the first single polarized light. The first movable mirror 111 reflects the first single polarized light to the target filter film. The target filter film reflects the first single polarized light. The reflected light of the first single polarized light is output to the second movable mirror 141 , and the second movable mirror 141 outputs the reflected light to the first polarization beam combining component 142 . The first polarization beam combining component 142 performs polarization beam combination on the reflected light to obtain first polarization beam combiner light, and outputs the first polarization beam combiner light to the through output end.

When the second input light passes through the second polarization beam splitting component 134, the second polarization beam splitting component 134 performs polarization splitting on the second input light to obtain second single polarized light. The third movable mirror 131 reflects the second single polarized light to the target filter film, and the incident angle is the target value. The target filter film transmits the second single polarized light. The transmitted light of the second single polarized light is incident to the second movable mirror 141 , and the second movable mirror 141 outputs the transmitted light to the first polarization beam combining component 142 . The first polarization beam combining component 142 performs polarization beam combination on the transmitted light to obtain third polarization beam combiner light, and outputs the third polarization beam combiner light to the through output end.

In this way, the second input light is transformed into single polarized light and enters the target filter film, so that the light filtering bandwidth of the same wavelength is the same when the second input light passes through the target filter film. Moreover, the output of the straight-through output port is also polarized beam combining light, which will not affect the transmission.

It should be noted here that after the incident angle is changed to the target value, the first input light does not include light of the target wavelength, so the first input light is not transmitted on the target filter film. The presence or absence of the first polarizing beam splitting component 113 will not affect the transmission of the first input light at the target filter film, but the first polarizing beam splitting component 113 is still provided because: when the first input light passes through to output at last, it will Polarization beam combining is performed through the first polarization beam combining component 142 , so polarization beam splitting must be performed before passing through this.

Exemplarily, different polarization states of light of the same wavelength have different filtering bandwidths in the target filter film. In order to continuously change the filter bandwidth of the second input light input at the upper wave input terminal in the target filter film, optical add-drop multiplexing The device also includes a second movable half-wave plate 16. The second movable half-wave plate 16 is disposed on the optical path between the second polarization beam splitting assembly 134 and the third movable mirror 131 .

The control component controls the second movable half-wave plate 16 to rotate, and when the second single-polarized light passes through the second movable half-wave plate 16, the polarization state of the second single-polarized light is changed. Exemplarily, when the transmission wavelength of the target filter film is the target wavelength, the control component determines the rotation angle corresponding to the target wavelength, and the control component controls the second movable half-wave plate 16 to rotate the rotation angle. Here, the method for the control unit to determine the rotation angle is: the control unit determines the rotation angle corresponding to the target wavelength in the correspondence between the rotation angle and the wavelength, and the correspondence can be stored in the memory of the control unit or in a memory that the control unit can access . In this way, by controlling the rotation of the second movable half-wave plate 16, the polarization state of the second single polarized light can be adjusted to realize continuous adjustment of the filter bandwidth.

In this way, when the optical add/drop multiplexer is used as a multiplexer device, the add wavelength can be automatically adjusted. Moreover, in the process of automatically adjusting the wavelength of the upper wave, since the total reflection film 22 is provided, the loss of the input light passing through the input end can be reduced. When adjusting to the target wavelength, setting the target filter diaphragm can enable the wave-up input end to perform wave-up processing. Moreover, since a half-wave plate is provided, the filtering bandwidth of the up-wave input light on the filter diaphragm can be continuously changed.

It should be noted that when the optical add/drop multiplexer is used as a wavelength splitter or multiplexer, the control component controls the first movable mirror 111 and the second movable mirror 141 to rotate synchronously during the incident angle change process. Exemplarily, the control part obtains the speed, direction and magnitude of rotation of the first movable mirror 111 and the second movable mirror 141, and controls the first movable mirror 111 and the second movable mirror 141 according to the speed, direction and magnitude. The mirror 141 is controlled. After the incident angle is changed to the target value, both the first movable mirror 111 and the second movable mirror 141 have been rotated to the corresponding positions, and no further rotation is required. When the optical add/drop multiplexer is used as a wavelength splitting device, the first controller 13 controls the third movable mirror 131 to output the transmitted light of the first input light on the target filter film to the transmission output end. When the optical add/drop multiplexer is used as a multiplexer, the first controller 13 controls the third movable mirror 131 to input the second input light. Exemplarily, the control component obtains the speed, direction and magnitude of rotation of the third movable mirror 131, and controls the third movable mirror 131 according to the speed, direction and magnitude.

In addition, in the embodiment of the present application, a relationship curve between the rotation angle of the movable half-wave plate and the filtering bandwidth is also provided as an example, see FIG. 31 . In FIG. 31 , the horizontal axis is the rotation angle, the unit is degree, and the vertical axis is the filter bandwidth, the unit is nm. Here, the filtering bandwidth is a filtering bandwidth of 3dB.

It should be noted that when the optical add-drop multiplexer is used as a wavelength-demultiplexing device, the through input end, the through output end and the transmission output end of the optical add-drop multiplexer are all provided with coupling mirrors, and the coupling mirrors are connected to optical fibers. The coupling mirror at the through-input end is for coupling the first input light into the optical add-drop multiplexer. The coupling mirror at the output end of the straight-through is to couple the light output from the optical add-drop multiplexer into the optical fiber for transmission. The coupling mirror at the transmission output end is to couple the light output from the optical add/drop multiplexer into the optical fiber for transmission.

When the optical add-drop multiplexer is used as a wave combining device, the through input end, the through output end and the wave-up input end of the optical add-drop multiplexer are all provided with coupling mirrors, and the coupling mirrors are connected to optical fibers. The coupling mirror at the through-input end is for coupling the first input light into the optical add-drop multiplexer. The coupling mirror at the output end of the straight-through is to couple the light output from the optical add-drop multiplexer into the optical fiber for transmission. The coupling mirror at the input end of the wave is used to couple the second input light into the optical add-drop multiplexer.

It should also be noted that in the embodiment of the present application, the control of the movable mirror is realized by controlling the MEMS on the movable mirror, and the control of the MEMS on the movable half-wave plate can also be realized by controlling the MEMS on the movable half-wave plate. Control of the movable half-wave plate. This is only an implementation manner of the embodiment of the present application, which is not limited in the embodiment of the present application.

The above is only an embodiment of the application, and is not intended to limit the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the application shall be included in the protection scope of the application. Inside.

Claims (24)

1. A kind of optical add-drop multiplexer, it is characterized in that, described optical add-drop multiplexer comprises input assembly (11), filter diaphragm (12), transmission loopback assembly (13) and output assembly (14) ; The input component (11) is used to receive the first input light, and adjust the output light of the first input light to enter the filter diaphragm during the process of adjusting the downwave wavelength or the upwave wavelength to the target wavelength (12) the angle of incidence; The transmission loopback component (13) is configured to receive the first transmitted light of the output light of the first input light in the filter diaphragm (12), and output the first transmitted light to the output component(14); The output component (14) is configured to receive the first reflected light and the first transmitted light of the output light of the first input light on the filter film (12), and combine the first reflected light and the first transmitted light The first transmitted light is output through through. 2. The optical add-drop multiplexer according to claim 1, wherein the optical add-drop multiplexer is a wave-division device; after the incident angle is adjusted to the target value corresponding to the target wavelength , the transmission loopback component (13), configured to receive the second transmitted light of the output light of the first input light in the filter diaphragm (12), and transmit the second transmitted light to output; The output component (14) is configured to receive the second reflected light of the output light of the first input light on the filter film (12), and output the second reflected light through through. 3. The optical add-drop multiplexer according to claim 1, wherein the optical add-drop multiplexer is a wave combining device; after adjusting the incident angle to the target value corresponding to the target wavelength , the transmissive loopback component (13), used to receive the second input light, according to the incident angle as the target value, the second input light is incident to the filter diaphragm (12), the second input the wavelength of the light is the target wavelength; The output component (14) is configured to receive the second reflected light of the output light of the first input light on the filter diaphragm (12) and the second reflected light of the second input light on the filter diaphragm (12) the third transmitted light, and output the second reflected light and the third transmitted light in a straight-through manner. 4. The optical add/drop multiplexer according to any one of claims 1 to 3, characterized in that, the input assembly (11) comprises a first movable mirror (111); In the process of adjusting the downwave wavelength or upwave wavelength to the target wavelength, the first movable reflector (111) is used to receive the first input light and adjust the output of the first input light by rotating The angle of incidence of light incident to the filter diaphragm (12); After adjusting the incident angle to the target value corresponding to the target wavelength, the first movable reflector (111) is used to receive the first input light, and output the output light of the first input light Incident to the filter diaphragm (12). 5. The optical add/drop multiplexer according to claim 4, characterized in that, the input assembly (11) further comprises a first fixed mirror (112); The first movable reflector (111) is arranged on the optical path between the first fixed reflector (112) and the filter diaphragm (12); The first fixed reflector (112) is configured to receive the first input light and reflect the first input light to the first movable reflector (111). 6. The optical add/drop multiplexer according to claim 2, characterized in that, the output assembly (14) comprises a second movable mirror (141); In the process of adjusting the downwave wavelength to the target wavelength, the second movable mirror (141) is used to receive the first reflected light and the first transmitted light, and rotate the first The reflected light and the first transmitted light are directly output; After adjusting the incident angle to the target value corresponding to the target wavelength, the second movable reflector (141) is used to receive the second reflected light and pass the second reflected light through output. 7. The optical add/drop multiplexer according to claim 2 or 6, wherein the transmissive loopback assembly (13) comprises a third movable mirror (131) and a fourth movable mirror (132) ); In the process of adjusting the downwave wavelength to the target wavelength, the third movable mirror (131) and the fourth movable mirror (132) are used to receive the first transmitted light and outputting said first transmitted light to said output assembly (14); After adjusting the incident angle to the target value corresponding to the target wavelength, the third movable reflector (131) is used to receive the second transmitted light, and rotate the second transmitted light Transmit output. 8. The optical add-drop multiplexer according to any one of claims 1 to 7, characterized in that, the optical add-drop multiplexer is a wavelength splitting device; the input assembly (11) includes a first polarization splitter A beam assembly (113); the output assembly (14) includes a first polarization beam combining assembly (142); the transmission loopback assembly (13) includes a second polarization beam combining assembly (133); The first polarization beam splitting component (113) is used to convert the first input light into single polarized light by polarization splitting before entering the filter film (12); The first polarization beam combining component (142) is used to convert the through-through output light into dual polarized light through polarization combination before the through-through output; The second polarization beam combining component (133) is used to convert the transmitted output light into dual polarized light through polarization combining before the transmitted output. 9. The optical add-drop multiplexer according to claim 8, characterized in that, the optical add-drop multiplexer also comprises a first movable half-wave plate (15); the first movable half-wave plate (15) arranged on the optical path between the filter film (12) and the first polarization beam splitting component (113); The first movable half-wave plate (15) is used to change the polarization state of the first input light after polarization beam splitting through rotation. 10. The optical add/drop multiplexer according to claim 3, characterized in that, the output assembly (14) comprises a second movable mirror (141); In the process of adjusting the wavelength of the upper wave to the target wavelength, the second movable mirror (141) is used to receive the first reflected light and the first transmitted light, and rotate the first The reflected light and the first transmitted light are directly output; After adjusting the incident angle to the target value corresponding to the target wavelength, the second movable mirror (141) is used to receive the second reflected light and the third transmitted light, and The second reflected light and the third transmitted light are directly output. 11. The optical add/drop multiplexer according to claim 3 or 10, characterized in that, the transmissive loopback assembly (13) comprises a third movable mirror (131) and a fourth movable mirror (132) ); In the process of adjusting the wavelength of the upper wave to the target wavelength, the third movable mirror (131) and the fourth movable mirror (132) are used to receive the first transmitted light, and outputting said first transmitted light to said output assembly (14); After the incident angle is adjusted to the target value corresponding to the target wavelength, the third movable reflector (131) is used to receive the second input light, and adjust the second input light according to the incident angle to the target value. The input light is incident on the filter film (12). 12. The optical add/drop multiplexer according to claim 10 or 11, characterized in that, the input component (11) comprises a first polarization beam splitting component (113); the output component (14) comprises a first A polarization beam combining component (142); the transmission loopback component (13) includes a second polarization beam splitting component (134); The first polarization beam splitting component (113) is used to convert the first input light into single polarized light by polarization splitting before entering the filter film (12); The second polarization beam splitting component (134) is used to convert the second input light into single polarized light by polarization splitting before entering the filter film (12); The first polarization beam combining component (142) is used for polarizing and combining the light output by the filter film (12) before outputting it into dual polarized light. 13. The optical add-drop multiplexer according to claim 12, characterized in that, the optical add-drop multiplexer also comprises a second movable half-wave plate (16); the second movable half-wave plate (16) arranged on the optical path between the filter film (12) and the second polarization beam splitting assembly (134); The second movable half-wave plate (16) is used to change the polarization state of the second input light after polarization beam splitting through rotation. 14. An optical add-drop multiplexer, characterized in that the optical add-drop multiplexer comprises a first input assembly (21), a full reflection diaphragm (22), at least one first filter diaphragm (23) and the first output assembly (24); the filter bandwidth of each of the first filter diaphragms (23) is different; The first input component (21) is used to receive the first input light, and adjust the output light of the first input light to be incident on the full The angle of incidence of the anti-diaphragm (22); After adjusting the incident angle to the target value corresponding to the target wavelength, the target filter film in the at least one first filter film (23) moves into the output optical path of the first input component (21), And the all-reflection diaphragm (22) is moved out of the output light path of the first input component (21); the target filter diaphragm is used for the target wavelength in the output light of the first input light light is transmitted; The first output component (24) is used to output the light output by the total reflection diaphragm (22) and the target filter diaphragm. 15. The optical add-drop multiplexer according to claim 14, characterized in that, the optical add-drop multiplexer is a wave splitting device; the first input component (21) comprises a first movable mirror ( 111); In the process of adjusting the downwave wavelength to the target wavelength, the first movable reflector (111) is used to receive the first input light, and adjust the output light of the first input light to be incident on the The angle of incidence of the total reflection diaphragm (22); After adjusting the incident angle to the target value corresponding to the target wavelength, the first movable reflector (111) is used to receive the first input light, and output the output light of the first input light incident on the objective filter diaphragm. 16. The optical add/drop multiplexer according to claim 15, characterized in that, the first output assembly (24) comprises a first sub-output assembly (241) and a second sub-output assembly (242); In the process of adjusting the wavelength of the downwave to the target wavelength, the first sub-output component (241) is used to output the reflected light output by the total reflection diaphragm (22) through; After the incident angle is adjusted to the target value corresponding to the target wavelength, the first sub-output component (241) is used to output the reflected light output by the target filter film through, and the second A sub-output assembly (242), configured to transmit and output the transmitted light output by the target filter film. 17. The optical add/drop multiplexer according to claim 16, characterized in that, the first sub-output assembly (241) comprises a second movable mirror (141); In the process of adjusting the wavelength of the downwave to the target wavelength, the second movable mirror (141) is used to output the reflected light output by the total reflection diaphragm (22) through rotation; After the incident angle is adjusted to a target value corresponding to the target wavelength, the second movable mirror (141) is used to output the reflected light output by the target filter film through through. 18. The optical add/drop multiplexer according to claim 16 or 17, characterized in that, the second sub-output assembly (242) comprises a third movable mirror (131); After the incident angle is adjusted to a target value corresponding to the target wavelength, the third movable mirror (131) is configured to transmit and output the transmitted light output by the target filter film through rotation. 19. The optical add/drop multiplexer according to any one of claims 16 to 18, characterized in that, the first input component (21) comprises a first polarization beam splitting component (113); The output assembly (241) includes a first polarization beam combining assembly (142); the second sub-output assembly (242) includes a second polarization beam combining assembly (133); The first polarization beam splitting component (113) is used to convert the first input light into single polarized light by polarization beam splitting before entering the target filter film; The first polarization beam combining component (142) is used to convert the reflected light output by the target filter film into dual polarized light through polarization combining before the straight-through output; The second polarization beam combining component (133) is used to polarize and combine the transmitted light output by the target filter film into dual polarized light before the transmission output. 20. The optical add-drop multiplexer according to claim 14, characterized in that, the optical add-drop multiplexer is a multiplexing device; the first input assembly (21) comprises a first sub-input assembly (211 ) and a second sub-input component (212); In the process of adjusting the wavelength of the upper wave to the target wavelength, the first sub-input component (211) is configured to receive the first input light, and adjust the output light of the first input light to be incident on the total reflection The incident angle of diaphragm (22); After adjusting the incident angle to the target value corresponding to the target wavelength, the first sub-input component (211) is configured to receive the first input light, and input the output light of the first input light To the target filter diaphragm, the second sub-input component (212) is used to receive the second input light, and the output light of the second input light is incident to the target according to the incident angle as the target value A filter film, the wavelength of the second input light is the target wavelength. 21. The optical add/drop multiplexer according to claim 20, characterized in that, the first sub-input assembly (211) comprises a first movable mirror (111); In the process of adjusting the wavelength of the upper wave to the target wavelength, the first movable reflector (111) is used to receive the first input light, and adjust the output light of the first input light to be incident on the The angle of incidence of the total reflection diaphragm (22); After adjusting the incident angle to the target value corresponding to the target wavelength, the first movable reflector (111) is used to receive the first input light, and output the output light of the first input light incident on the objective filter diaphragm. 22. The optical add/drop multiplexer according to claim 20 or 21, characterized in that, the second sub-input assembly (212) comprises a third movable mirror (131); The third movable reflector (131) is used to receive the second input light, and through rotation, the output light of the second input light is incident on the target filter film according to the incident angle as the target value piece. 23. The optical add/drop multiplexer according to any one of claims 20 to 22, wherein the first output assembly (24) comprises a second movable mirror (141); In the process of adjusting the wavelength of the upper wave to the target wavelength, the second movable mirror (141) is used to output the reflected light output by the total reflection diaphragm (22) through rotation; After the incident angle is adjusted to a target value corresponding to the target wavelength, the second movable mirror (141) is used to output reflected light and transmitted light output by the target filter film through through. 24. The optical add/drop multiplexer according to any one of claims 20 to 23, characterized in that, the first sub-input component (211) comprises a first polarization beam splitting component (113); the second The sub-input assembly (212) includes a second polarization beam splitting assembly (134); the first output assembly (24) includes a first polarization beam combining assembly (142); The first polarization beam splitting component (113) is used to convert the first input light into single polarized light by polarization beam splitting before entering the target filter film; The second polarization beam splitting component (134) is used to convert the second input light into single polarized light through polarization splitting before entering the target filter film; The first polarization beam combining component (142) is used to combine the light passing through the output into dual polarized light through polarization combining before output.

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