CN216670324U - An optical circulator component with wavelength division function - Google Patents

Abstract

The utility model provides an optical circulator component with a wavelength division function, which comprises a circulator core component and a wavelength division component, wherein the circulator core component comprises a first PBS prism and a second PBS prism, and a non-reciprocal optical rotating piece is arranged between the first PBS prism and the second PBS prism; the wavelength division component comprises a substrate, a light inlet is formed in one side, adjacent to the second PBS prism, of the substrate, at least two optical filters used for allowing light with specific wavelength to pass through are arranged on the other side of the substrate, a reflecting film used for reflecting light which does not pass through the optical filters and is reflected back is arranged on one side of the substrate, and a reflecting sheet used for reflecting light to one side of the substrate is arranged between the adjacent optical filters. Compared with the prior art, the optical circulator component is a free space type component which is formed by connecting a circulator core component and a wavelength division multiplexing component into a whole, has no optical fiber input and output at two ends and is irrelevant to polarization; the coupling loss is reduced, the performance is better while the size is smaller, the cost is lower, and the device can be packaged at various positions in the device.

Description

An optical circulator component with wavelength division function

technical field

The utility model relates to the field of optical communication, in particular to an optical circulator assembly with wavelength division function.

Background technique

As shown in Figure 1, the existing two-channel wavelength division technical solution includes an independent in-line three-port optical circulator 1, an independent in-line three-port optical wavelength division multiplexer 2 (in-line refers to the two ends of the optical fiber input output), connect the three ports 13 of the circulator and the COM port of the wavelength division multiplexer together through an optical fiber to form an optical circulator component with the function of splitting light according to wavelength. 12 output, when the light is input from the second port 12 of the circulator, it is output from the third port 13, and the light output from the third port 13 will enter the wavelength division multiplexer, and output two different wavelengths from the transmission end and the reflection end of the wavelength division multiplexer. beam of a channel.

Due to the minimum bending radius of the current optical fiber, the fusion and coiling of the optical fiber during the connection and packaging process will bring a certain loss and affect the size of the overall assembly. Under the limitation of the current processing technology, the size of the existing two-channel wavelength division optical ring technology solution is usually about 100mm×80mm×20mm, while the size of the embodiment in FIG. 1 can usually be 8mm×8mm×3mm.

As shown in FIG. 2 , in the existing four-channel wavelength division optical loop technical solution, the light output from the three ports 13 of the optical circulator is subjected to multi-channel wavelength division as follows: the reflection end of the upper-stage wavelength division multiplexer or the optical loop The three-port 13 of the device is connected to the COM terminal of the next-level wavelength division multiplexer, and the wavelength division of one channel can be increased by connecting a three-port wavelength division multiplexer. The light beam output from the transmission end of each stage will pass through the reflection loss of the filter 21 once more than the light beam output from the transmission end of the previous stage and the coupling loss of the optical fiber coupled into the reflection end. Due to this accumulated loss with the increase of the number of channels, the further the channel loss is, the greater the loss is. Cascading multiple wavelength division multiplexers will also bring about a substantial increase in cost and an increase in the size of the overall device.

Utility model content

In view of the above problems, the present invention provides an optical circulator assembly with wavelength division function, which combines the functions of an optical circulator and a wavelength division multiplexer, and has a compact structure, an arbitrary number of wavelength division channels, and multi-channel cumulative loss. smaller.

The technical scheme adopted by the utility model is:

An optical circulator assembly with wavelength division function, comprising a circulator core assembly and a wavelength division assembly, the circulator core assembly includes a first PBS prism and a second PBS prism, and a PBS prism is provided between the first PBS prism and the second PBS prism. The non-reciprocal optical rotator, the other side of the second PBS prism forms a first port, and the side of the first PBS prism and the first port on the second PBS prism in the same direction forms a port for light incident from the first port to exit. The second port, the second port is located above the first port, and the other side of the second PBS prism is also formed with a third port for the light incident from the second port to be output to the wavelength division component; the wavelength division component includes A substrate, the side of the substrate adjacent to the second PBS prism forms a light entrance, the other side of the substrate is provided with at least two filters for light to pass through, and one side of the substrate is provided with A reflective film for reflecting the light reflected back by the optical filter, and a reflective sheet for reflecting the light to the substrate side is provided between adjacent optical filters.

Preferably, the non-reciprocal optical rotator comprises a half-wave plate attached to the side of the first PBS prism, and a Faraday optical rotator attached to one side and the other side of the half-wave plate, and the other side of the Faraday rotator is One side of the second PBS prism is attached, and the half-wave plate has an optical axis of 22.5°.

Preferably, an AR film is provided in the light entrance of the substrate.

Preferably, the reflective film is an HR film.

Preferably, the reflective sheet is an HR sheet, and the HR sheet is a rectangular block with a high-reflection HR film plated on one side bonded to the substrate.

Preferably, when the wavelength division component has two channels, the filter in the second channel is replaced with an AR filter.

More preferably, the AR sheet is a rectangular block with one side polished on the clear surface and the other side coated with an AR film against air reflection, and the polished surface of the AR sheet is the surface bonded to the substrate.

Preferably, both the circulator core assembly and the wavelength division assembly are pasted on the same bottom plate.

Compared with the prior art, the beneficial effects of the present utility model are as follows: the present utility model provides an optical circulator assembly with a wavelength division function, wherein the circulator core assembly and the wavelength division multiplexing assembly are connected as a whole, and there are no optical fibers at both ends. Input and output, polarization-independent free-space components; the circulator core divides two different optical paths through two PBS prisms, and the non-reciprocal optical rotation components pass through the middle, realizing the ring in which the light in two directions takes different optical paths One side of the outgoing light is coated with AR film and HR film, and the other side is affixed with optical filters, HR films, AR films and wavelength division components to achieve the function of splitting light according to different wavelengths. By increasing the length of the glass substrate and increasing the corresponding diaphragms on both sides, the number of splitting channels is arbitrary; because the increased channel passes through the WDM film and HR film for a total of 3 reflections more than the previous channel, which is less than the existing solution. Coupling losses are eliminated, and the performance is better and the cost is lower at a smaller size; such a compact and small free-space component can be packaged in various positions in the device.

Description of drawings

Fig. 1 is a schematic diagram of the technical solution of the two-channel wavelength division optical ring in the prior art;

Fig. 2 is a schematic diagram of the technical solution of the four-channel wavelength division optical ring in the prior art;

3 is a schematic diagram of incident light beams from a first port in a two-channel implementation of an optical circulator assembly with wavelength division function provided by the present invention;

4 is a schematic diagram of incident light beams from a second port in a two-channel implementation of an optical circulator assembly with wavelength division function provided by the present invention;

5 is a schematic diagram of incident light beams from a first port in a four-channel implementation of an optical circulator assembly with wavelength division function provided by the present invention;

FIG. 6 is a schematic diagram of incident light beams from a second port in a four-channel implementation of an optical circulator assembly with wavelength division function provided by the present invention.

Detailed ways

The preferred embodiments provided by the present invention will be described in detail according to the accompanying drawings.

3 to 6 are preferred embodiments of an optical circulator assembly with wavelength division function provided by the present invention. As shown in FIG. 3 to FIG. 6 , the optical circulator assembly with wavelength division function includes a circulator core assembly 10 and a wavelength division assembly 20 . The circulator core assembly 10 includes a first PBS prism 11 and a second PBS prism 12 . A non-reciprocal optical rotator 13 is arranged between a PBS prism 11 and a second PBS prism 12 , a first port 101 is formed on the other side of the second PBS prism 12 , and a first port 101 is formed on the other side of the first PBS prism 11 and the second PBS prism 12 . One side of the port 101 in the same direction is formed with a second port 102 for exiting the light incident from the first port, the second port 102 is located above the first port 101, and the other side of the second PBS prism 12 is also formed with a second port 102 for exiting the light incident from the first port. The light incident from the second port is output to the third port 103 of the wavelength division assembly; the wavelength division assembly 20 includes a substrate 21, and the side of the substrate 21 adjacent to the second PBS prism forms a light entrance 201, and the other side of the substrate One side is provided with at least two filters 22 for passing light of a specific wavelength, and one side of the substrate 22 is provided with a reflective film 23 for reflecting the light that does not pass through the filters and is adjacent to the A reflective sheet 24 for reflecting light to the substrate side is provided between the filters, so that the light incident from the first port 101 passes through the second PBS prism 12, the non-reciprocal optical rotator 13 and the first PBS prism 11 from the first PBS prism 11. The second port 102 exits, and the light incident from the second port exits from the third port 103 through the first PBS prism 12 , the non-reciprocal optical rotator 13 and the second PBS prism 12 , and exits from the light entrance port 201 of the wavelength division component 20 When the light enters the wavelength division component 20, when the light is transmitted to the filter 22 of the first channel on the other side of the substrate, the light corresponding to the emission wavelength of the filter of the first channel is emitted from the filter 22, and the rest of the light is reflected to the first channel of the substrate. On the side, it is reflected by the reflective film 23 to the other side of the substrate, and the reflective sheet 24 on the other side of the substrate reflects the light to the reflective film 23 on one side of the substrate, and then reflects the light to the filter 22 of the second channel. Light...and so on until the light exits the last filter.

Both the circulator core assembly 10 and the wavelength division assembly 20 are pasted on the same base plate 30 . The wavelength division component 20 can be a wavelength division component with any number of channels greater than two channels. By increasing the length of the substrate and adding corresponding diaphragms on both sides of the substrate, the number of light-splitting channels can be arbitrary and can be performed according to different wavelengths. For light splitting, for example, the number of light-splitting channels of the wavelength division components in FIGS. 3 to 4 is two channels, and the number of light-splitting channels of the wavelength division components in FIGS. 5 to 6 is four channels. When the wavelength division component has two channels, the filter in the second channel can be replaced with AR sheet 25. The AR sheet is a rectangular block with one side polished on the clear surface, and the other side is coated with anti-reflection AR film for air. The AR sheet is polished The surface is the surface to be bonded to the glass substrate.

The light entrance 201 of the substrate is provided with an AR film 211. The AR film (Anti-Reflection) is called an anti-reflection film, or is also called an anti-reflection film, which can effectively improve the transmittance of light passing through the substrate and reduce the reflectance. The reflective film 23 is an HR film, and the HR film (High-Reflection) is a high-reflection film. The reflective sheet 24 is an HR sheet, and the HR sheet is a rectangular block with a high-reflection HR film plated on one side bonded to the substrate. The light-transmitting surface of the filter 22 is a rectangular block of WMS-15 or an equivalent material, one side of which is coated with an AR film for air, and the other side is coated with a band-pass filter film of a corresponding wavelength. The WDM film surface is the surface bonded to the glass substrate.

It is worth noting that the PBS prism is a polarizing beam splitter prism, which can divide the incident unpolarized light into two vertical linearly polarized lights, of which the P polarized light completely passes through, while the S polarized light is reflected at an angle of 45 degrees, and the exit direction is 90 degrees from the P light. angle. The polarizing beam splitting prism is made of a pair of high-precision right-angle prisms glued together, and a polarizing beam splitting dielectric film is coated on the hypotenuse of one of the prisms.

The non-reciprocal optical rotator includes a half-wave plate 131 attached to the side of the first PBS prism, and a Faraday rotator 132 attached to one side and the other side of the half-wave plate, and the other side of the Faraday rotator 132 is One side of the second PBS prism 12 is attached, and the half-wave plate 131 has an optical axis of 22.5°. When the light beam is incident from the first port 101 , the light beam incident from the first port 101 enters the 45° polarization splitting of the second PBS prism 12 At the film surface, it is divided into P light and S light, P light (beam whose polarization vector is parallel to the plane shared by incident light and reflected light) transmits, and S light (beam whose polarization vector is perpendicular to the plane shared by incident light and reflected light) Reflected, the P light and the S light pass through the Faraday rotator 132 and the half-wave plate 131 with the 22.5° optical axis in turn, and the polarization direction remains unchanged. At the 45° polarized beam splitter surface of the first PBS prism 11, the P light is transmitted, and the S light Reflected, the P light and the S light are combined into a beam of light, which exits from the second port 102 after total reflection; and when the light beam is incident from the second port 102, the light beam enters the 45° polarization beam splitter surface of the first PBS prism, and is divided into P light and S light, P light is transmitted, S light is reflected, P light and S light pass through the half-wave plate 131 and Faraday rotator 132 with an optical axis of 22.5° in turn, and the polarization directions of P light and S light are rotated in one direction by 90° °, the P light becomes S' light, the S light becomes P' light, the two beams enter the polarizing beam splitter surface of the second PBS prism 12, the P light is transmitted, the S light is reflected, and the two beams are combined into a circularly polarized light After total reflection at the glass-air interface, it passes through the third port 103 of the second PBS prism 12, enters the light entrance 201 coated with the AR film of the wavelength division component, enters the glass substrate 21 and reaches the filter 22 of the first channel, satisfying The filter 22 of the first channel transmits the light of the transmission wavelength, and the light of the remaining wavelengths is reflected at the WDM film of the filter, and is reflected at the HR film 23 on the other side of the glass substrate 21, and the HR film 24 on the other side is reflected. It is reflected at the HR film 23 on the other side of the glass substrate 21 to meet the transmission wavelength of the light filter 22 of the second channel, and so on to the last channel.

It is worth noting that, as shown in Figure 3 to Figure 4, when the wavelength division component is a two-channel component, the AR film is set at the second channel, and the rest after the light of the wavelength transmitted by the filter 22 of the first channel is transmitted. The wavelength of light is reflected at the WDM film of the filter, reflected at the HR film 23 on the other side of the glass substrate, reflected at the HR film 24 on the other side, and reflected at the HR film 23 on the other side of the glass substrate , which satisfies the light transmission of the AR film transmission wavelength of the second channel.

To sum up, the technical solution of the present invention can fully and effectively realize the purpose of the above-mentioned utility model, and the structure and functional principle of the present invention have been fully verified in the embodiment, and the expected effect and purpose can be achieved. Various changes or modifications can be made to the embodiments of the present invention without departing from the principle and essence of the present invention. Therefore, the present invention includes all the replacement contents within the scope mentioned in the scope of the patent application, and any equivalent changes made within the scope of the patent application of the present utility model are all within the scope of the patent application of this case.

Claims (8)

1. An optical circulator component with a wavelength division function is characterized by comprising a circulator core component and a wavelength division component, wherein the circulator core component comprises a first PBS prism and a second PBS prism, a non-reciprocal optical rotating piece is arranged between the first PBS prism and the second PBS prism, a first port is formed on the other side of the second PBS prism, a second port for emitting light incident from the first port is formed on one side, in the same direction, of the first port on the first PBS prism, a second port for emitting the light incident from the first port is formed on one side, in the same direction, of the first port on the first PBS prism, the second port is formed above the first port, and a third port for emitting the light incident from the second port to the wavelength division component is formed on the other side of the second PBS prism; the wavelength division component comprises a substrate, a light inlet is formed in one side, adjacent to the second PBS prism, of the substrate, at least two light filters used for light to pass through are arranged on the other side of the substrate, a reflecting film used for reflecting light which does not pass through the light filters and is reflected back is arranged on one side of the substrate, and a reflecting sheet used for reflecting light to one side of the substrate is arranged between the adjacent light filters.

2. An optical circulator assembly with wavelength division function as claimed in claim 1, wherein: the nonreciprocal optical rotation piece comprises a half-wave plate attached to the side face of the first PBS prism and a Faraday optical rotation plate attached to one side face of the half-wave plate and the other side face of the Faraday optical rotation plate, the other side face of the Faraday optical rotation plate is attached to one side face of the second PBS prism, and the half-wave plate is provided with an optical axis of 22.5 degrees.

3. An optical circulator assembly with wavelength division function as claimed in claim 1, wherein: an AR film is arranged in the light inlet of the substrate.

4. An optical circulator assembly with wavelength division function as claimed in claim 1, wherein: the reflective film is an HR film.

5. An optical circulator assembly with wavelength division function as claimed in claim 1, wherein: the reflector plate is an HR plate, and the HR plate is a rectangular square with one surface bonded with the substrate plated with a high-reflection HR film.

6. An optical circulator assembly with wavelength division function as claimed in claim 1, wherein: when the wavelength division component is provided with two channels, the optical filter in the second channel is replaced by an AR sheet.

7. An optical circulator assembly with wavelength division capability as claimed in claim 6, wherein: the AR sheet is a rectangular square with one polished surface and the other surface plated with an air anti-reflection AR film, and the polished surface of the AR sheet is bonded with the substrate.

8. An optical circulator assembly with wavelength division function as claimed in claim 1, wherein: the circulator core assembly and the wavelength division assembly are both adhered to the same bottom plate.

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