CN118732181A - An optical module - Google Patents

Abstract

The present application discloses an optical module, including: a light receiving space formed by the snapping of a tube cap and a tube seat, a light shaping component located at the through hole of the tube cap, converting a beam of second light signal into a first sub-beam and a second sub-beam with different angles. The first sub-beam and the second sub-beam both contain signal lights of two different wavelengths and are converging beams. The first filter and the first photodetector are located in the light-emitting direction of the first sub-beam in the light-shaping component; the second filter and the second photodetector are located in the light-emitting direction of the second sub-beam in the light-shaping component. The central axis of the light shaping component coincides with the bisector of the angle between the first sub-beam and the second sub-beam. The light shaping component is used to realize the optical channel optical path design, and the filter does not need to be tilted, thereby improving the coupling accuracy of the optical module.

Description

An optical module

Technical Field

The present application relates to the field of communication technology, and in particular to an optical module.

Background Art

With the development of new services and application models such as cloud computing, mobile Internet, and video, the advancement of optical communication technology has become increasingly important. In optical communication technology, optical modules are one of the key components in optical communication equipment, and with the development of optical communication technology, the transmission rate of optical modules continues to increase.

Summary of the invention

The present application provides an optical module to improve the communication rate of the optical module.

In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

The embodiment of the present application discloses an optical module, including: a tube holder;

Pipe socket;

A tube cap is buckled on the top of the tube cap and enclosed with the tube base to form a light receiving space, wherein the tube cap has a through hole;

a light shaping component, located at the through hole, converting the second optical signal into a first sub-beam and a second sub-beam, wherein the second optical signal is a collimated beam, the first sub-beam and the second sub-beam are converging beams, the first sub-beam and the second sub-beam both contain a first signal light and a second signal light, the wavelength of the first signal light is different from the wavelength of the second signal light, and the central axis of the light shaping component coincides with a bisector of an angle between the first sub-beam and the second sub-beam;

A first filter is located on the light output path of the focusing lens, and the first sub-beam only contains the signal light of the first wavelength after passing through the first filter;

A second filter is located on the light output path of the focusing lens, and the second sub-beam only contains the signal light of the second wavelength after passing through the second filter;

A first photodetector is located on the tube base, and a photosensitive surface of the first photodetector faces the first filter; and

The second photodetector is located on the tube base, and the photosensitive surface of the second photodetector faces the second filter.

Beneficial effects of this application:

The present application discloses an optical module, comprising: a light receiving space formed by the buckling of a tube cap and a tube seat, a light shaping component located at the through hole of the tube cap, and converting a beam of second light signal into a first sub-beam and a second sub-beam with different angles. The first sub-beam and the second sub-beam both contain signal lights of two different wavelengths. And the first sub-beam and the second sub-beam are converging beams. The first filter is located in the light-emitting direction of the first sub-beam in the light-shaping component; the second filter is located in the light-emitting direction of the second sub-beam in the light-shaping component, and the wavelengths of light filtered out by the first filter and the second filter are different. The central axis of the diffraction beam splitter coincides with the bisector of the angle between the first sub-beam and the second sub-beam. According to the optical module provided by the present application, the light shaping component divides the parallel light beam into two sub-beams with different angles, and the sub-beams are filtered by the filter and converge on different photodetectors, and the photodetectors convert the light signal into an electrical signal. The light shaping component is used to realize the optical path design of the optical channel, and the filter does not need to be tilted, thereby improving the coupling accuracy of the optical module.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required to be used in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the product involved in the embodiments of the present disclosure, the actual process of the method, the actual timing of the signal, etc.

FIG1 is a partial architecture diagram of an optical communication system provided according to some embodiments of the present disclosure;

FIG2 is a partial structural diagram of a host computer provided according to some embodiments of the present disclosure;

FIG3 is a structural diagram of an optical module provided according to some embodiments of the present disclosure;

FIG4 is an exploded view of an optical module provided according to some embodiments of the present disclosure;

FIG5 is a structural diagram of an optical receiving component according to some embodiments of the present disclosure;

FIG6 is a cross-sectional view of a light receiving component provided according to some embodiments of the present disclosure;

FIG7 is an exploded view of a light receiving component provided according to some embodiments of the present disclosure;

FIG8 is a light path diagram of a light receiving component provided according to some embodiments of the present disclosure;

FIG9 is a partial diagram of an optical path of a light receiving component provided according to some embodiments of the present disclosure;

FIG10 is a light path diagram of a focusing lens according to some embodiments of the present disclosure;

FIG11 is a structural diagram of a filter component and an optoelectronic component provided according to some embodiments of the present disclosure;

FIG12 is a cross-sectional view of another light receiving component provided according to some embodiments of the present disclosure;

FIG13 is an exploded view of another light receiving component provided according to some embodiments of the present disclosure;

FIG. 14 is a light path diagram of another light receiving component provided according to some embodiments of the present disclosure.

DETAILED DESCRIPTION

Optical communication technology establishes information transmission between information processing devices. Optical communication technology loads information onto light and uses the propagation of light to achieve information transmission. Light loaded with information is an optical signal. When optical signals propagate in information transmission equipment, they can reduce the loss of optical power and achieve high-speed, long-distance, and low-cost information transmission. Information that can be processed by information processing equipment exists in the form of electrical signals. Optical network terminals/gateways, routers, switches, mobile phones, computers, servers, tablets, and televisions are common information processing devices, and optical fibers and optical waveguides are common information transmission equipment.

The mutual conversion of optical signals and electrical signals between information processing equipment and information transmission equipment is realized through optical modules. For example, an optical fiber is connected to the optical signal input end and/or the optical signal output end of the optical module, and an optical network terminal is connected to the electrical signal input end and/or the electrical signal output end of the optical module; the first optical signal from the optical fiber is transmitted into the optical module, the optical module converts the first optical signal into a first electrical signal, and the optical module transmits the first electrical signal into the optical network terminal; the second electrical signal from the optical network terminal is transmitted into the optical module, the optical module converts the second electrical signal into a second optical signal, and the optical module transmits the second optical signal into the optical fiber. Since information processing devices can be connected to each other through an electrical signal network, at least one type of information processing device needs to be directly connected to the optical module, and it is not necessary for all types of information processing devices to be directly connected to the optical module. The information processing device directly connected to the optical module is called the host computer of the optical module.

FIG1 is a partial architecture diagram of an optical communication system provided according to some embodiments of the present disclosure. As shown in FIG1 , the optical communication system partially presents a remote information processing device 1000 , a local information processing device 2000 , a host computer 100 , an optical module 200 , an optical fiber 101 , and a network cable 103 .

One end of the optical fiber 101 extends toward the remote information processing device 1000, and the other end is connected to the optical interface of the optical module 200. The optical signal can be totally reflected in the optical fiber 101, and the propagation of the optical signal in the direction of total reflection can almost maintain the original optical power. The optical signal is totally reflected multiple times in the optical fiber 101, and the optical signal from the direction of the remote information processing device 1000 is transmitted into the optical module 200, or the light from the optical module 200 is propagated toward the remote information processing device 1000, so as to realize long-distance and low-power-loss information transmission.

The number of optical fibers 101 may be one or more (two or more); the optical fiber 101 and the optical module 200 may be connected in a pluggable movable manner or in a fixed manner.

The host computer 100 has an optical module interface 102, which is configured to access the optical module 200, so that the host computer 100 establishes a unidirectional/bidirectional electrical signal connection with the optical module 200; the host computer 100 is configured to provide data signals to the optical module 200, or receive data signals from the optical module 200, or monitor and control the working status of the optical module 200.

The host computer 100 has an external electrical interface, such as a Universal Serial Bus (USB) interface and a network cable interface 104, which can be connected to an electrical signal network. For example, the network cable interface 104 is configured to connect to the network cable 103, so that the host computer 100 and the network cable 103 establish a unidirectional/bidirectional electrical signal connection.

Optical Network Unit (ONU), Optical Line Terminal (OLT), Optical Network Terminal (ONT) and data center servers are common host computers.

One end of the network cable 103 is connected to the local information processing device 2000 , and the other end is connected to the host computer 100 . The network cable 103 establishes an electrical signal connection between the local information processing device 2000 and the host computer 100 .

For example, the third electrical signal emitted by the local information processing device 2000 is transmitted to the host computer 100 through the network cable 103. The host computer 100 generates a second electrical signal based on the third electrical signal. The second electrical signal from the host computer 100 is transmitted to the optical module 200. The optical module 200 converts the second electrical signal into a second optical signal. The optical module 200 transmits the second optical signal into the optical fiber 101. The second optical signal is transmitted to the remote information processing device 1000 in the optical fiber 101.

For example, a first optical signal from the direction of a remote information processing device 1000 propagates through the optical fiber 101, the first optical signal from the optical fiber 101 is transmitted into the optical module 200, the optical module 200 converts the first optical signal into a first electrical signal, the optical module 200 transmits the first electrical signal into the host computer 100, the host computer 100 generates a fourth electrical signal based on the first electrical signal, and the host computer 100 transmits the fourth electrical signal to the local information processing device 2000.

The optical module is a tool for realizing the mutual conversion between optical signals and electrical signals. During the conversion process between optical signals and electrical signals, the information does not change, but the encoding and decoding method of the information can change.

FIG2 is a partial structural diagram of a host computer provided according to some embodiments of the present disclosure. In order to clearly show the connection relationship between the optical module 200 and the host computer 100, FIG2 only shows the structure of the host computer 100 related to the optical module 200. As shown in FIG2, the host computer 100 also includes a PCB circuit board 105 arranged in the housing, a cage 106 arranged on the surface of the PCB circuit board 105, a heat sink 107 arranged on the cage 106, and an electrical connector (not shown in the figure) arranged inside the cage 106, and the heat sink 107 has a protruding structure that increases the heat dissipation area, and the fin-shaped structure is a common protruding structure.

The optical module 200 is inserted into the cage 106 of the host computer 100, and the cage 106 fixes the optical module 200. The heat generated by the optical module 200 is transferred to the cage 106 and then diffused through the heat sink 107. After the optical module 200 is inserted into the cage 106, the electrical interface of the optical module 200 is connected to the electrical connector inside the cage 106.

FIG3 is a structural diagram of an optical module provided according to some embodiments of the present disclosure, and FIG4 is an exploded diagram of an optical module provided according to some embodiments of the present disclosure. As shown in FIG3 and FIG4, the optical module 200 includes a shell, a circuit board 300 disposed in the shell, a light emitting component 400, and a light receiving component 500. However, the present disclosure is not limited thereto, and in some embodiments, the optical module 200 includes one of the light emitting component 400 and the light receiving component 500.

The housing comprises an upper housing 201 and a lower housing 202 . The upper housing 201 covers the lower housing 202 to form the housing having a first opening 204 and a second opening 205 . The outer contour of the housing is generally a square body.

In some embodiments, the lower shell 202 includes a bottom plate 2021 and two lower side plates 2022 located on both sides of the bottom plate 2021 and arranged perpendicular to the bottom plate 2021; the upper shell 201 includes a cover plate 2011, and the cover plate 2011 covers the two lower side plates 2022 of the lower shell 202 to form the above-mentioned shell.

In some embodiments, the lower shell 202 includes a bottom plate 2021 and two lower side plates 2022 located on both sides of the bottom plate 2021 and vertically arranged with the bottom plate 2021; the upper shell 201 includes a cover plate 2011 and two upper side plates located on both sides of the cover plate 2011 and vertically arranged with the cover plate 2011, and the two upper side plates are combined with the two lower side plates 2022 to realize that the upper shell 201 covers the lower shell 202.

The direction of the connection line between the first opening 204 and the second opening 205 may be consistent with the length direction of the optical module 200, or inconsistent with the length direction of the optical module 200. For example, the first opening 204 is located at the end of the optical module 200 (the right end of FIG. 3 ), and the second opening 205 is also located at the end of the optical module 200 (the left end of FIG. 3 ). Alternatively, the first opening 204 is located at the end of the optical module 200, and the second opening 205 is located at the side of the optical module 200. The first opening 204 is an electrical interface, and the gold finger of the circuit board 300 extends from the electrical interface and is inserted into the electrical connector of the host computer; the second opening 205 is an optical port, which is configured to access the optical fiber 101 so that the optical fiber 101 is connected to the optical emitting component 400 and/or the optical receiving component 500 in the optical module 200.

The assembly method of combining the upper shell 201 and the lower shell 202 is adopted, so that the components such as the circuit board 300, the light emitting component 400, and the light receiving component 500 can be installed in the above shell, and the upper shell 201 and the lower shell 202 can encapsulate and protect the shapes of these components. In addition, when assembling the components such as the circuit board 300, the light emitting component 400 and the light receiving component 500, it is convenient to deploy the positioning components, heat dissipation components, and electromagnetic shielding components of these devices, which is conducive to the automated production.

In some embodiments, the upper shell 201 and the lower shell 202 are made of metal materials to facilitate electromagnetic shielding and heat dissipation.

In some embodiments, the optical module 200 further includes an unlocking component 203 located outside its housing. The unlocking component 203 is configured to achieve a fixed connection between the optical module 200 and the host computer, or to release the fixed connection between the optical module 200 and the host computer.

For example, the unlocking component 203 is located on the outside of the two lower side plates 2022 of the lower housing 202, and includes a snap-fit component that matches the cage 106 of the host computer. When the optical module 200 is inserted into the cage 106, the snap-fit component of the unlocking component 203 fixes the optical module 200 in the cage 106; when the unlocking component 203 is pulled, the snap-fit component of the unlocking component 203 moves accordingly, thereby changing the connection relationship between the snap-fit component and the host computer, so as to release the snap-fit fixed connection between the optical module 200 and the host computer, so that the optical module 200 can be pulled out of the cage 106.

The circuit board 300 includes circuit traces, electronic components and chips, etc. The electronic components and chips are connected together according to the circuit design through the circuit traces to realize the functions of power supply, electrical signal transmission and grounding. The electronic components may include capacitors, resistors, triodes, metal-oxide-semiconductor field-effect transistors (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), etc. The chips may include microcontroller units (Microcontroller Unit, MCU), laser driver chips, transimpedance amplifiers (Transimpedance Amplifier, TIA), limiting amplifiers (Limiting amplifier, LA), clock and data recovery chips (Clock and Data Recovery, CDR), power management chips, digital signal processing (Digital Signal Processing, DSP) chips.

The circuit board 300 is generally a rigid circuit board. Due to its relatively hard material, the rigid circuit board can also realize the load-bearing function. For example, the rigid circuit board can stably carry the above-mentioned electronic components and chips; the rigid circuit board is also easy to insert into the electrical connector in the upper computer cage.

The circuit board 300 also includes a gold finger formed on the end surface thereof, and the gold finger is composed of a plurality of independent pins. The circuit board 300 is inserted into the cage 106, and the gold finger is connected to the electrical connector in the cage 106. The gold finger can be set only on the surface of one side of the circuit board 300 (such as the upper surface shown in FIG. 4), or can be set on the surfaces of the upper and lower sides of the circuit board 300 to provide more pins. The gold finger is configured to establish an electrical connection with the host computer to realize power supply, grounding, I2C signal transmission, data signal transmission, etc.

Of course, flexible circuit boards are also used in some optical modules. Flexible circuit boards are generally used in conjunction with rigid circuit boards to supplement rigid circuit boards.

The light emitting component 400 and/or the light receiving component 500 are located on a side of the circuit board 300 away from the gold finger; in some embodiments, the light emitting component 400 and the light receiving component 500 are physically separated from the circuit board 300, and then electrically connected to the circuit board 300 through corresponding flexible circuit boards or electrical connectors; in some embodiments, the light emitting component and/or the light receiving component can be directly set on the circuit board 300, can be set on the surface of the circuit board, and can also be set on the side of the circuit board as shown in Figure 4.

FIG. 5 is a structural diagram of an optical receiving component provided according to some embodiments of the present disclosure. FIG. 6 is a cross-sectional diagram of an optical receiving component provided according to some embodiments of the present disclosure. FIG. 7 is a schematic diagram of an exploded view of an optical emitting device provided according to some embodiments of the present disclosure. As shown in FIG. 5, FIG. 6 and FIG. 7, the optical receiving component 500 provided in this embodiment includes a tube seat 510, a tube cap 520 and other components arranged in the tube cap 520 and the tube seat 510. The tube cap 520 is covered at one end of the tube seat 510. The tube seat 510 includes a plurality of pins 530, which are used to realize the electrical connection between the flexible circuit board and other electrical components in the optical receiving component 500, and then realize the electrical connection between the optical receiving component 500 and the circuit board 300. This embodiment only takes the structure shown in FIG. 5 as an example.

The tube cap is buckled onto the tube base 510 to form a light receiving space, and the first photodetector 570, the second photodetector 580, the focusing lens 550, and the filter assembly 560 are arranged inside the light emitting space.

The base 510 is used to support and carry the first photodetector 570, the second photodetector 580 and the filter assembly 560. The base 510 is provided with a plurality of through holes for fixing the pins.

In order to increase the optical communication rate, the optical module is provided with multiple optical channels, each of which carries a signal. Multiple channels represent at least two optical channels. Different optical channels carry different signals. Therefore, multiple optical receiving channels are provided in the optical receiving component to receive multiple signal lights at the same time. In the embodiment of the present disclosure, the multiple signal lights include at least two signal lights.

In some embodiments of the present disclosure, a through hole is provided on the top of the tube cap of the optical receiving component 500 to facilitate receiving the second optical signal from the optical fiber adapter. The second optical signal includes a first signal light and a second signal light, wherein the first signal light and the second signal light have different wavelengths, such as the wavelength of the first signal light is λ1, and the wavelength of the second signal light is λ2.

A collimator is provided in the optical fiber adapter, and the second optical signal emitted by the optical fiber adapter is a collimated light beam. The optical receiving component 500 receives the second optical signal and divides the second optical signal into a first sub-beam and a second sub-beam. The first sub-beam includes the first signal light and the second signal light, and the second sub-beam includes the first signal light and the second signal light.

The first sub-beam and the second sub-beam are two beams of light with the same power but different angles, and both the first sub-beam and the second sub-beam are collimated beams.

The sum of the power of the first sub-beam and the power of the second sub-beam is equal to the power of the second optical signal; and the power of the first sub-beam is the same as the power of the second sub-beam.

The channel aperture of the first sub-beam is the same as the channel aperture of the second optical signal; the channel aperture of the second sub-beam is the same as the channel aperture of the second optical signal. The aperture of the first sub-beam is the diameter of the optical channel of the first sub-beam. The aperture of the second sub-beam is the diameter of the optical channel of the second sub-beam. The channel aperture of the second optical signal is the diameter of the optical channel of the second optical signal.

The diffraction beam splitter 540 is located at the through hole and splits the second optical signal into a first sub-beam and a second sub-beam. The diffraction beam splitter splits the incident second optical signal into a first sub-beam and a second sub-beam. The second optical signal includes a first signal light and a second signal light, wherein the first signal light and the second signal light have different wavelengths, and the first signal light and the second signal light can carry different signals.

The first sub-beam includes the first signal light and the second signal light, and the second sub-beam includes the first signal light and the second signal light. The first sub-beam and the second sub-beam are two beams of light with the same power and different angles, and the first sub-beam and the second sub-beam are both parallel beams.

In some embodiments of the present disclosure, after the second optical signal emitted by the collimating adapter is incident on the diffraction beam splitter, it is graded and diffracted into two collimated light beams of ±1 order. The optical receiving component 500 also includes a focusing lens 550, a filtering component 560 and an optoelectronic component. The focusing lens 550 converts the first sub-beam and the second sub-beam from a collimated beam to a converging beam. The filtering component 560 filters the first sub-beam and the second sub-beam respectively, and the filtered beams are received by the optoelectronic component, which converts the optical signal into an electrical signal. The electrical signal is transmitted to the circuit board via the pin, and then transmitted to the host computer via the circuit board.

The filter assembly 560 is covered above the photoelectric assembly to filter out signal lights of different wavelengths. The photoelectric assembly includes a first photodetector 570 and a second photodetector 580. The photoelectric assembly is arranged on the surface of the tube holder 510. The first photodetector 570 and the second photodetector 580 are used to receive the first sub-beam and the second sub-beam after filtering, respectively.

FIG8 is a light path diagram of a light receiving component provided according to some embodiments of the present disclosure. FIG9 is a partial light path diagram of a light receiving component provided according to some embodiments of the present disclosure. As shown in FIG8 and FIG9, taking the optical axis of the second signal light as the reference line, the angle between the optical axis of the first sub-beam and the reference line is θ, and the angle between the optical axis of the second sub-beam and the reference line is -θ. That is to say, the angle between the optical axis of the first sub-beam and the reference line and the angle between the optical axis of the second sub-beam and the reference line are the same, but in opposite directions.

In some embodiments of the present disclosure, the angle between the optical axis of the first sub-beam and the reference line is greater than or equal to 10°, and the angle between the optical axis of the first sub-beam and the reference line is less than or equal to 35°.

The tube cap is also provided with a lens mounting hole, and a focusing lens 550 is located at the lens mounting hole. The focusing lens 550 converts the first sub-beam from a collimated beam into a convergent beam, and also converts the second sub-beam from a collimated beam into a convergent beam.

In some embodiments of the present disclosure, the focusing lens 550 can be a lens or a combination of two lenses. When the focusing lens 550 is a plano-convex lens, one side of the lens is a plane and the other side is a convex surface. Light is refracted on the convex surface of the focusing lens 550 to produce a converging effect. In some examples of the present disclosure, the convex surface of the focusing lens 550 can be set toward the diffraction beam splitter or toward the filter component 560.

In some embodiments, the focusing lens 550 includes only one plano-convex lens with a relatively large height.

When the focusing lens 550 includes only one plano-convex lens with a relatively large height, the upper half of the focusing lens converges the first sub-beam emitted by the diffraction beam splitter 540 , and the lower half of the focusing lens converges the second sub-beam emitted by the diffraction beam splitter 540 .

A focusing lens with a relatively large height can converge the signal light received by the light receiving component. The sum of the apertures of the two sub-beams emitted by the diffraction beam splitter 540 is larger than the aperture of the second signal light received by the diffraction beam splitter 540. The focusing lens 550 only includes a focusing lens with a relatively large height to converge the two sub-beams emitted by the diffraction beam splitter 540, and the converged light spot effect is better.

In addition, compared with a plano-convex lens with a larger height, it is more difficult to assemble two plano-convex lenses with a smaller height in the cavity. In order to reduce the assembly difficulty, in some embodiments, the focusing lens 550 includes only one plano-convex lens with a larger height, and the central axis of the focusing lens coincides with the central axis of the diffraction beam splitter 540.

In some embodiments, the focusing lens 550 may be a Fresnel lens, which is also known as a spiral lens. The Fresnel lens is a thin sheet made of polyolefin material or a thin sheet made of glass. One side of the lens surface of the Fresnel lens is a smooth surface, and the other side is engraved with concentric circles from small to large. The texture of the Fresnel lens is designed by utilizing the interference and perturbation of light and according to the relative sensitivity and receiving angle requirements.

When the focusing lens 550 is a plano-convex lens, the distance between the focusing lens 550 and the diffraction beam splitter is 0.8 mm to 1.2 mm. The angle between the optical axis of the first sub-beam and the reference line is inversely proportional to the distance between the diffraction beam splitter and the focusing lens 550, that is, the larger the angle between the optical axis of the first sub-beam and the reference line, the smaller the distance between the diffraction beam splitter and the focusing lens 550 can be.

The distance between the diffraction beam splitter and the focusing lens 550 is reduced, making the various structures inside the light receiving component more compact, which is beneficial to reducing the overall space of the light receiving component.

In some embodiments of the present disclosure, the central axis of the focusing lens 550 is arranged in parallel with the central axis of the diffraction beam splitter 540, and does not need to be arranged at different angles, which is beneficial to improving the coupling accuracy of the optical module.

In some embodiments of the present disclosure, the diffraction beam splitter 540 and the focusing lens 550 constitute a light shaping assembly.

In some embodiments of the present disclosure, when there is no collimator in the optical fiber adapter, the light shaping component may further include a collimating lens. The collimating lens is disposed at the through hole of the tube cap, and the diffraction beam splitter 540 and the focusing lens 550 are disposed inside the light receiving space. After the signal light emitted by the optical fiber adapter is collimated by the collimating lens, it enters the diffraction beam splitter 540 and the focusing lens 550, and is first diffracted into two collimated light beams of ±1 order by the diffraction beam splitter 540, and then converged by the focusing lens 550.

FIG10 is an optical path diagram of a focusing lens provided according to some embodiments of the present disclosure. FIG10 shows that when the focusing lens 550 is a lens and the convex surface of the focusing lens 550 can face the diffraction beam splitter, the central axis of the first sub-beam forms a certain angle with the convex surface of the focusing lens 550. The convex surface of the focusing lens 550 forms a converging effect on the first sub-beam according to the principle of refraction. After passing through the convex surface of the focusing lens 550, the first sub-beam is converted from a parallel beam to a converging beam. The central axis of the second sub-beam forms a certain angle with the convex surface of the focusing lens 550. The convex surface of the focusing lens 550 forms a converging effect on the second sub-beam according to the principle of refraction. After passing through the convex surface of the focusing lens 550, the second sub-beam is converted from a parallel beam to a converging beam.

In some embodiments of the present disclosure, the light beam formed after the first sub-beams are converged and the light beam formed after the second sub-beams are converged have the same focal length.

The filter assembly 560 includes a first filter 561 and a second filter 562, wherein the first filter 561 is located on the optical path of the first sub-beam, and the second filter 562 is located on the optical path of the first sub-beam. The first filter 561 filters the first sub-beam, allowing the first signal light with a wavelength of λ1 to be transmitted, and reflecting the second signal light with a wavelength of λ2. The second filter 562 filters the second sub-beam, allowing the second signal light with a wavelength of λ2 to be transmitted, and reflecting the first signal light with a wavelength of λ1.

FIG. 11 is a structural diagram of a filter assembly and an optoelectronic assembly provided according to some embodiments of the present disclosure. As shown in FIG. 11 , in order to facilitate the installation and fixation of the first filter 561 and the second filter 562, the filter assembly 560 further includes a base 563 and a first arm 564 and a second arm 565 disposed on both sides of the base 563. The first arm 564 supports the first filter 561 so that the first filter 561 is covered above the first photodetector 570. The second arm 565 supports the second filter 562 so that the second filter 562 is covered above the second photodetector 580. In some examples of the present disclosure, the first photodetector 570 is disposed on the upper surface of the tube holder 510, and the first photodetector 570 is located in the light emitting direction of the first filter 561. The first filter 561 filters the first sub-beam and only allows the first signal light with a wavelength of λ1 to pass through. The first photodetector 570 receives the first signal light and converts the first signal light into an electrical signal, which is transmitted to the circuit board through the pin. The second photodetector 580 is disposed on the upper surface of the tube holder 510. The second photodetector 580 is located in the light emitting direction of the second filter 562. The second filter 562 filters the second sub-beam and only allows the second signal light with a wavelength of λ2 to pass through. The second photodetector 580 receives the second signal light and converts the second signal light into an electrical signal, which is transmitted to the circuit board through the pin.

In some embodiments of the present disclosure, the projection of the first filter 561 on the tube holder 510 covers the photosensitive surface of the first photodetector 570, and the projection of the second filter 562 on the tube holder 510 covers the photosensitive surface of the second photodetector 580. The area of the first filter 561 is larger than the area of the photosensitive surface of the first photodetector 570, and the area of the second filter 562 is larger than the area of the photosensitive surface of the second photodetector 580. The distance between the first filter 561 and the tube holder 510 is equal to the distance between the second filter 562 and the tube holder 510.

The central axis of the first filter 561 is parallel to the central axis of the second filter 562 , and the central axis of the first filter 561 is parallel to the central axis of the focusing lens 550 , and the central axis of the second filter 562 is parallel to the central axis of the focusing lens 550 .

Therefore, the central axis of the first filter 561, the central axis of the second filter 562, the central axis of the focusing lens 550, and the central axis of the diffraction beam splitter are all arranged in parallel. In some embodiments provided by the present disclosure, the central axes of the first filter 561, the second filter 562, the focusing lens 550, and the diffraction beam splitter are all perpendicular to the surface of the tube holder 510, and there is no need to set them at different angles, which is beneficial to improving the coupling accuracy of the optical module. In some embodiments of the present disclosure, the first filter 561 and the second filter 562 are both perpendicular to the tube holder 510. During the installation process, it is only necessary to set the vertical distance between the first filter and the second filter and the surface of the tube holder, and it is not necessary to set the angle between the first filter and the surface of the tube holder, and it is not necessary to set the angle between the second filter and the surface of the tube holder, which is beneficial to improving the coupling accuracy of the optical module.

The following explanation is based on the plane where the surface of the tube seat is located as the X-Y coordinate plane, and the axis perpendicular to the surface of the tube seat is the Z axis. During the installation process, it is only necessary to set the coordinate of the plane center of the first filter on the Z axis to determine the position of the first filter. There is no need to set the angle between the first filter and the X-Y coordinate plane, which facilitates the fixing of the position of the first filter during installation and helps to improve the coupling accuracy of the optical module.

Similarly, the first photodetector 570 is located in the light emitting direction of the first filter 561. The first photodetector 570 receives the first signal light and converts the first signal light into an electrical signal, which is transmitted to the circuit board through the pin. The second photodetector 580 is arranged on the upper surface of the tube holder 510. The second filter 562 filters the second sub-beam and only allows the first signal light with a wavelength of λ1 to pass through. The second photodetector 580 receives the second signal light and converts the second signal light into an electrical signal, which is transmitted to the circuit board through the pin.

The photosensitive surface of the first photodetector 570 faces the first filter 561, and the normal line of the photosensitive surface of the first photodetector 570 is perpendicular to the first filter 561. The photosensitive surface of the second photodetector 580 faces the second filter 562, and the normal line of the photosensitive surface of the second photodetector 580 is perpendicular to the first filter 561.

In some embodiments of the present disclosure, a first substrate is provided between the first photodetector 570 and the socket, a first circuit is provided on the surface of the first substrate, and the first circuit is connected to the first pin, for transmitting the electrical signal of the first photodetector 570 to the first pin. A second substrate is provided between the second photodetector 580 and the socket, a second circuit is provided on the surface of the second substrate, and the second circuit is connected to the second pin, for transmitting the electrical signal of the second photodetector 580 to the second pin.

In some embodiments of the present disclosure, the first filter 561 is as close as possible to the photosensitive surface of the first photodetector 570 to prevent the second signal light with a wavelength of λ2 from entering the first photodetector 570, thereby reducing the influence of stray light on the received signal of the first photodetector 570. The second filter 562 is as close as possible to the photosensitive surface of the second photodetector 580 to prevent the first signal light with a wavelength of λ1 from entering the second photodetector 580, thereby reducing the influence of stray light on the received signal of the second photodetector 580.

Therefore, in some embodiments of the present disclosure, the normal line of the photosensitive surface of the first photodetector 570, the normal line of the photosensitive surface of the second photodetector 580, the central axis of the first filter 561, the central axis of the second filter 562, the central axis of the focusing lens 550, and the central axis of the diffraction beam splitter are all arranged in parallel. In some embodiments provided by the present disclosure, the normal line of the photosensitive surface of the first photodetector 570, the normal line of the photosensitive surface of the second photodetector 580, the first filter 561, the second filter 562, the focusing lens 550, and the central axis of the diffraction beam splitter are all perpendicular to the surface of the tube holder 510, and there is no need to set them at different angles, which is conducive to improving the coupling accuracy of the optical module.

The present application discloses an optical module, including: a light receiving space formed by the buckling of a tube cap and a tube seat, a diffraction beam splitter located at the through hole of the tube cap, converting a beam of second light signal into two first sub-beams and second sub-beams with different angles. The first sub-beam and the second sub-beam both contain signal lights of two different wavelengths. The focusing lens 550 is located in the light output path of the diffraction beam splitter, converting the first sub-beam and the second sub-beam from collimated beams to convergent beams. The first filter 561 is located in the light output direction of the first sub-beam at the focusing lens 550; the second filter 562 is located in the light output direction of the second sub-beam at the focusing lens 550, and the first filter 561 and the second filter 562 allow signal lights of different wavelengths to pass through. The central axis of the diffraction beam splitter coincides with the bisector of the angle between the first sub-beam and the second sub-beam. According to the optical module provided by the present application, the diffraction beam splitter divides the parallel light beam into two sub-beams with different angles, and then the two sub-beams converge on different photodetectors after passing through the focusing lens 550, and the photodetector converts the optical signal into an electrical signal. The diffraction beam splitter is used to realize the optical channel optical path design, and the filter does not need to be tilted, thereby improving the coupling accuracy of the optical module.

FIG. 12 is a cross-sectional view of another light receiving component provided according to some embodiments of the present disclosure, and FIG. 13 is an exploded view of another light receiving component provided according to some embodiments of the present disclosure. As shown in FIG. 12 and FIG. 13, in some embodiments of the present disclosure, the focusing lens 550 is a Fresnel lens, and the optical surface of the Fresnel lens is glued together with the diffraction beam splitter. The concentric surface of the Fresnel lens faces the tube holder. After the second signal light passes through the diffraction beam splitter, it is graded and diffracted into a first sub-beam and a second sub-beam of ±1 order, wherein the first sub-beam and the second sub-beam are both collimated beams. Then the first sub-beam and the second sub-beam enter the Fresnel lens, and the Fresnel lens converges the first sub-beam and the second sub-beam respectively. The Fresnel lens converges the first sub-beam into a light spot, and the Fresnel lens converges the second sub-beam into another light spot.

The second optical signal includes a first signal light and a second signal light, wherein the wavelengths of the first signal light and the second signal light are different, such as the wavelength of the first signal light is λ1, and the wavelength of the second signal light is λ2. The optical fiber 101 is also provided with a collimator, and the second optical signal emitted by the optical fiber 101 is a collimated light beam. The diffraction beam splitter receives the second optical signal and divides the second optical signal into a first sub-beam and a second sub-beam. At this time, the first sub-beam contains the first signal light and the second signal light, and the second sub-beam contains the first signal light and the second signal light. The first sub-beam and the second sub-beam are two beams of light with the same power and different angles, and the first sub-beam and the second sub-beam are both collimated beams. The sum of the power of the first sub-beam and the power of the second sub-beam is equal to the power of the second optical signal; and the power of the first sub-beam is the same as the power of the second sub-beam.

The channel aperture of the first sub-beam is the same as the channel aperture of the second optical signal; the channel aperture of the second sub-beam is the same as the channel aperture of the second optical signal. The aperture of the first sub-beam is the diameter of the optical channel of the first sub-beam. The aperture of the second sub-beam is the diameter of the optical channel of the second sub-beam. The channel aperture of the second optical signal is the diameter of the optical channel of the second optical signal.

The optical receiving component 500 further includes a filter component 560 and an optoelectronic component. The filter component 560 filters the first sub-beam and the second sub-beam respectively. The filtered beams are received by the optoelectronic component, which converts the optical signal into an electrical signal. The electrical signal is transmitted to the circuit board via the pin, and then transmitted to the host computer via the circuit board.

The filter assembly 560 is covered above the optoelectronic assembly to allow signal lights of different wavelengths to pass through. The optoelectronic assembly includes a first photodetector 570 and a second photodetector 580. The optoelectronic assembly is arranged on the surface of the tube holder 510. The first photodetector 570 and the second photodetector 580 are used to receive the first sub-beam and the second sub-beam after filtering, respectively.

In some embodiments of the present disclosure, a transimpedance amplifier may be provided above the tube holder to receive and amplify the electrical signal from the photodetector, and the amplified electrical signal is transmitted to the circuit board via the tube pin.

FIG14 is a light path diagram of another light receiving component provided according to some embodiments of the present disclosure. As shown in FIG14, the optical surface of the Fresnel lens is glued together with the diffraction beam splitter to form a beam splitter, and the second light signal forms a first sub-beam and a second sub-beam after passing through the beam splitter, and the first sub-beam and the second sub-beam are both converging beams. The first sub-beam and the second sub-beam are two beams of light with the same power and different angles, and the first sub-beam contains the first signal light and the second signal light, and the second sub-beam contains the first signal light and the second signal light.

The diffraction beam splitter is made of optical glass material with a thickness of 0.3 mm and an aperture of 1.5 mm. The inclination angle of the outgoing beam is ±12.5° and the beam diameter is 500 μm.

The filter assembly 560 includes a first filter 561 and a second filter 562, wherein the first filter 561 is located on the optical path of the first sub-beam, and the second filter 562 is located on the optical path of the first sub-beam. The first filter 561 filters the first sub-beam, allowing the first signal light with a wavelength of λ1 to be transmitted, and reflecting the second signal light with a wavelength of λ2. The second filter 562 filters the second sub-beam, allowing the second signal light with a wavelength of λ2 to be transmitted, and reflecting the first signal light with a wavelength of λ1.

It includes: a light receiving space formed by the tube cap and the tube seat being buckled together, and a diffraction beam splitter is located at the through hole of the tube cap, which converts a beam of second light signal into two first sub-beams and second sub-beams with different angles. The first sub-beam and the second sub-beam both contain signal lights of two different wavelengths. The light-emitting optical path of the Fresnel lens and the diffraction beam splitter converts the first sub-beam and the second sub-beam from collimated beams to convergent beams. The first filter 561 is located in the light-emitting direction of the first sub-beam in the Fresnel lens; the second filter 562 is located in the light-emitting direction of the second sub-beam in the Fresnel lens, and the first filter 561 and the second filter 562 allow signal lights of different wavelengths to pass through. The central axis of the diffraction beam splitter coincides with the bisector of the angle between the first sub-beam and the second sub-beam. According to the optical module provided in the present application, the diffraction beam splitter divides the parallel light beam into two sub-beams with different angles, and then the two sub-beams converge on different photodetectors after passing through the Fresnel lens, and the photodetector converts the optical signal into an electrical signal. The diffraction beam splitter is used to realize the optical channel optical path design, and the filter does not need to be set at an angle, thereby improving the coupling accuracy of the optical module.

Since the above embodiments are all described by citing and combining with other embodiments, different embodiments have the same parts, and the same and similar parts between the embodiments in this specification can be referred to each other. No further detailed description is given here.

It should be noted that, in this specification, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such circuit structure, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the existence of other identical elements in the circuit structure, article or device including the element.

Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the disclosure of the present application. The present application is intended to cover any variation, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the content of the claims.

The above-described embodiments of the present application do not constitute a limitation on the protection scope of the present application.

Claims (10)

1. An optical module, comprising:

A tube seat;

the pipe cap is buckled above the pipe cap and is enclosed with the pipe seat to form a light receiving space, wherein the pipe cap is provided with a through hole;

The light shaping assembly is positioned at the through hole and used for converting a second light signal into a first sub-beam and a second sub-beam, wherein the second light signal is a collimated light beam, the first sub-beam and the second sub-beam are converging light beams, the first sub-beam and the second sub-beam both comprise first signal light and second signal light, the wavelength of the first signal light is different from that of the second signal light, and the central axis of the light shaping assembly coincides with the bisector of the included angle between the first sub-beam and the second sub-beam;

The first filter is positioned on the light-emitting path of the focusing lens, and the first sub-beams only comprise first signal light after passing through the first filter;

the second filter is positioned on the light-emitting path of the focusing lens, and the second sub-beams only comprise second signal light after passing through the second filter;

the first photoelectric detector is positioned on the tube seat, and the photosensitive surface of the first photoelectric detector faces the first filter; and

The second photoelectric detector is positioned on the tube seat, and the photosensitive surface of the second photoelectric detector faces the second filter.

2. The light module of claim 1 wherein the light shaping assembly comprises:

a diffraction beam splitter that splits the second optical signal into two parallel beams;

and the focusing lens is positioned on the light-emitting path of the diffraction beam splitter, and the focusing diffraction beam splitter and the central axis of the focusing lens are in the same straight line.

3. The light module of claim 2 wherein the focusing lens is two lenses.

4. The optical module of claim 2, wherein the focusing lens is a plano-convex lens, the angle between the first sub-beam and the central axis of the diffractive beam splitter is greater than or equal to 10 °, and the angle between the first sub-beam and the central axis of the diffractive beam splitter is less than or equal to 35 °;

An included angle between the second sub-beam and a central axis of the diffraction beam splitter is greater than or equal to 10 degrees, and an included angle between the second sub-beam and the central axis of the diffraction beam splitter is less than or equal to 35 degrees.

5. The optical module of claim 2, wherein the focusing lens is a fresnel lens having a light surface in contact with the diffractive beam splitter.

6. The optical module of claim 5, further comprising: the base is positioned between the first photoelectric detector and the second photoelectric detector;

The first support arm is positioned at the top of the base and is used for bearing the first filter plate;

The second support arm is positioned at the top of the base and is used for bearing the second filter plate;

the first support arm and the second support arm are respectively positioned at two sides of the central shaft of the diffraction beam splitter.

7. The optical module of claim 5, wherein a normal to the first filter is parallel to a central axis of the focusing lens; the normal line of the second filter plate is parallel to the central axis of the focusing lens.

8. The optical module of claim 1, wherein a sum of the power of the first sub-beam and the power of the second sub-beam is equal to the power of the second optical signal.

9. The optical module of claim 1, wherein the channel aperture of the first sub-beam is the same as the channel aperture of the second optical signal; the channel aperture of the second sub-beam is the same as the channel aperture of the second optical signal.

10. The optical module of claim 5, wherein a normal to a photosensitive surface of the first photodetector, a normal to a photosensitive surface of the second photodetector, a central axis of the first filter, a central axis of the second filter, a central axis of the focusing lens, and a central axis of the diffraction beam splitter are all parallel.