Optical Transmitting Component, Optical Transceiver Component and Optical Line Terminal

Abstract

The present application discloses an optical transmission component, an optical transceiver component, and an optical line terminal, relating to the field of optical communication technologies. The optical transmission component includes a housing, an optical transmission unit, and a coupling unit; a side wall of the housing has a light outlet for facing a first port of an optical fiber; the optical transmission unit is located inside the housing and includes a first optical transmitter for transmitting a first optical signal and a second optical transmitter for transmitting a second optical signal; the coupling unit is located on a side of the optical transmission unit close to the light outlet, and the coupling unit is used for transmitting the first optical signal and the second optical signal so that the first optical signal and the second optical signal converge and are coupled to the first port through the light outlet. For the optical transmission component provided by the present application, its size can be effectively controlled, facilitating miniaturized design.

Description

Technical Field

[0001] This application relates to the field of optical communication technologies, and in particular, to an optical transmission component, an optical transceiver component, and an optical line terminal. Background Art

[0002] An optical transceiver component is a device used to implement the transmission and reception of optical signals.

[0003] In related technologies, an optical transceiver component mainly includes an optical transmission component and an optical reception component. The optical transmission component is used to convert an electrical signal into an optical signal and input it into an optical fiber. The optical reception component is used to receive the optical signal output from the optical fiber and convert it into an electrical signal. For an optical transmission component, if two different optical signals need to be transmitted, usually two optical transmitters, two collimating lenses, and several mirrors are configured. First, the two optical transmitters are used to output optical signals respectively, and the two optical signals are collimated into parallel optical signals through the collimating lenses. Then, through the mirrors, the two optical signals are reflected onto a multiplexer to use the multiplexer to multiplex and output the parallel optical signals.

[0004] However, the collimating lenses and mirrors will occupy a relatively large layout space, resulting in an overly large size of the optical transmission component. Summary of the Invention

[0005] Embodiments of this application provide an optical transmission component, an optical transceiver component, and an optical line terminal to solve the problem of the overly large size of the optical transmission component. The technical solutions are as follows:

[0006] In a first aspect, an optical transmission component is provided, including a housing, an optical transmission unit, and a coupling unit. The housing is used to accommodate the optical transmission unit and the coupling unit, thereby providing an installation basis and installation space for the optical transmission unit and the coupling unit. In addition, the side wall of the housing has a light outlet, and the light outlet faces the first port of the optical fiber, which can facilitate the transmission of the optical signal from the housing and its coupling to the first port of the optical fiber. The optical transmission unit includes a first optical transmitter and a second optical transmitter. The first optical transmitter is used to transmit a first optical signal, and the second optical transmitter is used to transmit a second optical signal. The wavelengths of the first optical signal and the second optical signal are different. That is to say, the transmission of two optical signals with different wavelengths can be achieved through the optical transmission unit. The coupling unit is located on one side of the optical transmission unit and close to the light outlet. The coupling unit is used to converge the first optical signal and the second optical signal so that the first optical signal and the second optical signal can be coupled to the first port of the optical fiber through the light outlet.

[0007] The optical transmission component provided by the embodiments of this application has at least the following effects:

[0008] When the optical transmission component provided by the embodiment of the present application transmits an optical signal, the optical transmission unit outputs a first optical signal and a second optical signal to the coupling unit, so as to converge with each other under the action of the coupling unit. The converged first optical signal and second optical signal pass through the light output port and are finally coupled to the first port of the optical fiber, so as to further output the first optical signal and the second optical signal through the optical fiber. It can be seen that the optical transmission component provided by the embodiment of the present application can output a first optical signal and a second optical signal through the optical transmission unit, and converge the first optical signal and the second optical signal through the coupling unit to be directly coupled to the first port of the optical fiber. Devices such as collimating lenses and mirrors in the related art are eliminated, so that the size of the optical transmission component can be effectively controlled, facilitating the realization of the miniaturized design of the optical transmission component.

[0009] As an exemplary embodiment, the coupling unit includes a multiplexer and a first lens. The multiplexer is used to multiplex the first optical signal and the second optical signal, and the first lens is used to converge the multiplexed first optical signal and second optical signal and couple them to the first port of the optical fiber. The multiplexer includes a first input port, a second input port and an output port, and the first input port, the second input port and the output port are respectively arranged on the outer side wall of the multiplexer, so as to facilitate the coupling of the first input port with the first optical transmitter, the second input port with the second optical transmitter, and the output port outputs the multiplexed first optical signal and second optical signal. The first lens is located on the side of the multiplexer away from the optical transmission unit and on the light output line of the output port, so that the multiplexed first optical signal and second optical signal can converge with each other through the first lens and be coupled to the first port of the optical fiber.

[0010] As an exemplary embodiment, the multiplexer is a planar lightwave waveguide type multiplexer, which is based on planar lightwave waveguide technology, so that the optical waveguides of the first optical signal and the second optical signal are on the same plane, which is beneficial to controlling the size of the multiplexer and thus facilitating the realization of the miniaturized design of the optical transmission component.

[0011] As an exemplary embodiment, the first lens is installed in the light output port. With such a design, the light output port is used as the installation base of the first lens, so that the first lens is accommodated in the light output port. That is to say, the first lens can not only converge the first optical signal and the second optical signal, but also seal the light output port. In this case, the first optical signal and the second optical signal start to converge through the first lens and at the same time pass through the light output port and are output until they are coupled to the first port of the optical fiber.

[0012] As an exemplary embodiment, the first lens is located in the lumen of the housing. The lumen of the housing is the internal space of the housing. Arranging the first lens in the lumen of the housing can better protect the first lens and is beneficial to the encapsulation of the first lens in the housing. In this case, the first optical signal and the second optical signal first start to converge through the first lens, and during the convergence process, they are output through the light exit port until they are coupled to the first port of the optical fiber.

[0013] As an exemplary embodiment, the optical transmitting component further includes a first flat window cap, which is sleeved outside the light exit port and is used to seal the light exit port. With such a design, the first lens can be located in the lumen of the housing without being embedded in the light exit port of the housing.

[0014] As an exemplary embodiment, the coupling unit includes a second lens and a third lens. The second lens is used to converge the first optical signal and couple it to the first port of the optical fiber, and the third lens is used to converge the second optical signal and couple it to the first port of the optical fiber. In this way, the first optical signal and the second optical signal can both converge towards the first port of the optical fiber and finally be coupled to the first port of the optical fiber. The second lens is arranged opposite to the first optical transmitter and is located on the light output line of the first optical transmitter, which can facilitate the convergence of the first optical signal output by the first optical transmitter by the second lens. For the same reason, the third lens is arranged opposite to the second optical transmitter and is located on the light output line of the second optical transmitter, which can facilitate the convergence of the second optical signal output by the second optical transmitter by the third lens.

[0015] As an exemplary embodiment, the second lens and the third lens each have their own principal optical axes, and the principal optical axes of the second lens and the third lens intersect on the side away from the optical transmitting unit. In this way, the second lens and the third lens are arranged obliquely to each other, which can not only transmit the first optical signal and the second optical signal respectively to avoid interference between the first optical signal and the second optical signal, but also make more flexible use of the space in the lumen of the housing to avoid the difficulty of miniaturizing the optical transmitting component due to the side-by-side arrangement of the second lens and the third lens. And because the first optical signal and the second optical signal are different, the required coupling efficiencies are also different. Therefore, the principal optical axis of the second lens is located on the first optical transmitter, and there is a gap between the principal optical axis of the third lens and the second optical transmitter. That is to say, one side of the second lens faces the first optical transmitter directly, which can adapt to the first optical signal with a higher required coupling efficiency, and one side of the second lens faces the second optical transmitter obliquely, which can adapt to the second optical signal with a lower required coupling efficiency.

[0016] As an exemplary embodiment, the second lens and the third lens are installed in the light output port. Designed in this way, using the light output port as the installation base for the second lens and the third lens enables the second lens and the third lens to be accommodated in the light output port. That is to say, the second lens and the third lens can not only converge the first optical signal and the second optical signal, but also seal the light output port. In this case, while the first optical signal and the second optical signal start to converge when passing through the second lens and the third lens, they are output through the light output port until being coupled to the first port of the optical fiber.

[0017] As an exemplary embodiment, the second lens and the third lens are located in the lumen of the housing. Arranging the second lens and the third lens in the lumen of the housing can better protect the second lens and the third lens and is conducive to the encapsulation of the second lens and the third lens in the housing. In this case, the first optical signal and the second optical signal first start to converge when passing through the second lens and the third lens respectively, and during the converging process, they are output through the light output port until being coupled to the first port of the optical fiber.

[0018] As an exemplary embodiment, the optical transmission component further includes a second flat window cap, which is sleeved outside the light output port and is used to seal the light output port. Designed in this way, the second lens and the third lens can be located in the lumen of the housing without being installed in the light output port of the housing.

[0019] As an exemplary embodiment, the second lens and the third lens are an integral structural member. Designed in this way, not only can the structure of the second lens and the third lens be more compact to facilitate the miniaturization design of the optical transmission component, but also the manufacturing efficiency of the second lens and the third lens can be improved by using the one-piece forming technology.

[0020] As an exemplary embodiment, the optical transmission component further includes a temperature control unit, which is used to adjust the temperature of the optical transmission unit. The temperature control unit is located inside the housing and is close to the optical transmission unit, which is conducive to the temperature control unit to adjust and control the temperature of the optical transmission unit to avoid the temperature of the optical transmission unit being too high.

[0021] Second aspect, there is also provided an optical transceiver module, which includes a housing, an optical transmission component, an optical reception component, and a wavelength division multiplexer. The housing has a cavity for providing a transmission space for optical signals. The side wall of the housing has three ports, namely an optical transmission port, an optical reception port, and an optical fiber connection port. The optical transmission port, the optical reception port, and the optical fiber connection port are respectively in communication with the cavity to receive the optical signals transmitted in the cavity. The optical transmission port houses the optical transmission component, which is the optical transmission component described in the first aspect and has all the beneficial effects of the optical transmission component described in the first aspect. The optical reception port houses the optical reception component. The optical fiber connection port houses the first port of the optical fiber. The wavelength division multiplexer is located inside the cavity. The wavelength division multiplexer is used to transmit the first optical signal and the second optical signal emitted by the optical transmission component to the first port of the optical fiber, and reflect the third optical signal and the fourth optical signal emitted by the first port of the optical fiber to the optical reception component, thereby realizing the on-demand wavelength division of the first optical signal, the second optical signal, the third optical signal, and the fourth optical signal. That is to say, through the optical transceiver module, the optical transmission component can send the first optical signal and the second optical signal to the first port of the optical fiber, and the optical reception component can receive the third optical signal and the fourth optical signal output from the first port of the optical fiber.

[0022] The optical transceiver module provided by the embodiment of the present application has at least the following effects:

[0023] The optical transceiver module provided by the embodiment of the present application can realize the transmission and reception of optical signals. For the transmission of optical signals, the converging first optical signal and second optical signal are output by the optical transmission component. The converging first optical signal and second optical signal pass through the wavelength division multiplexer and are coupled to the first port of the optical fiber, thereby realizing the transmission of the first optical signal and the second optical signal. For the reception of optical signals, the third optical signal and the fourth optical signal are output from the first port of the optical fiber. The third optical signal and the fourth optical signal are reflected by the wavelength division multiplexer and coupled to the optical reception component, thereby realizing the reception of the third optical signal and the fourth optical signal. Moreover, since the optical transmission component is the optical transmission component described in the first aspect, the size of the optical transmission component is small, so that the size of the optical transceiver module can be effectively controlled, which is convenient for realizing the miniaturized design of the optical transceiver module.

[0024] As an exemplary embodiment, the cavity includes a first optical channel and a second optical channel. One end of the first optical channel is communicated with the optical transmission port, and the other end of the first channel is communicated with the optical fiber port. That is to say, the first optical channel connects the optical transmission port and the optical fiber connection port. One end of the second optical channel is communicated with the optical reception port, and the other end of the second optical channel is communicated with the first optical channel. That is to say, the second optical channel connects the optical reception port and the first optical channel. A demultiplexer is disposed at the connection of the first optical channel and the second optical channel, so that the demultiplexer can transmit the first optical signal and the second optical signal output at the optical transmission port to the optical fiber port, and reflect the third optical signal and the fourth optical signal output at the optical fiber port to the optical connection port, thereby realizing the transmission of at least two different optical signals and the reception of at least two different optical signals.

[0025] In a third aspect, an optical line terminal is further provided. The optical line terminal includes an optical transceiver component. The optical transceiver component is the optical transceiver component described in the second aspect and has all the beneficial effects of the optical transceiver component described in the second aspect. Through the optical transceiver component, the optical line terminal can realize the transmission of at least two different optical signals and the reception of at least two different optical signals. Moreover, since the optical transceiver component is the optical transceiver component described in the second aspect, the size of the optical transceiver component is small, so that the size of the optical line terminal can be effectively controlled, facilitating the realization of the miniaturized design of the optical line terminal. Description of the Drawings

[0026] Figure 1 Structural schematic diagram of the optical transmission component provided by the embodiment of the present application;

[0027] Figure 2 Structural schematic diagram of the optical transmission component with the first coupling unit provided by the embodiment of the present application;

[0028] Figure 3 Structural schematic diagram of the optical transmission component with the first coupling unit provided by the embodiment of the present application;

[0029] Figure 4 Structural schematic diagram of the optical transmission component with the first coupling unit provided by the embodiment of the present application;

[0030] Figure 5 Structural schematic diagram of the optical transmission component with the first coupling unit provided by the embodiment of the present application;

[0031] Figure 6 Structural schematic diagram of the optical transmission component with the second coupling unit provided by the embodiment of the present application;

[0032] Figure 7 Structural schematic diagram of the optical transmission component with the second coupling unit provided by the embodiment of the present application;

[0033] Figure 8 Schematic structural diagram of the optical transceiver module provided by an embodiment of the present application;

[0034] Figure 9 Networking schematic diagram of the passive optical network system provided by an embodiment of the present application.

[0035] Legend description:

[0036] 1. Housing; 11. Light output port; 2. Optical transmitting unit; 21. First optical transmitter; 22. Second optical transmitter; 3. Coupling unit; 31. Combiner; 311. First input port; 312. Second input port; 313. Output port; 32. First lens; 33. Second lens; 34. Third lens; 4. First flat window cap; 5. Second flat window cap; 6. Temperature control unit; A. Optical fiber; A'. Port;

[0037] 10. Housing; 101. Cavity; 1011. First optical channel; 1012. Second optical channel; 102. Optical transmitting port; 103. Optical receiving port; 104. Optical fiber connection port; 20. Optical transmitting component; 30. Optical receiving component; 40. Demultiplexer;

[0038] 100. Optical line terminal; 200. Optical distribution network; 300. Optical network unit. Specific embodiments

[0039] The terms used in the embodiments section of the present application are only for explaining the embodiments of the present application and are not intended to limit the present application.

[0040] Optical transmission is a mainstream communication solution. Due to its characteristics of ultra-high bandwidth and low electromagnetic interference, it is currently widely deployed and applied to access networks represented by fiber to the home (FTTH).

[0041] A passive optical network (PON) is the main form applied in the access network. A passive optical network includes an optical line terminal (OLT), an optical distribution network (ODN), and an optical network unit (ONU). The optical line terminal and the optical network unit are connected through the optical distribution network, and there are no active electronic devices between them. Generally speaking, one optical line terminal corresponds to one optical fiber distribution network, and one optical fiber distribution network corresponds to multiple optical network units. Each optical network unit can be regarded as a user. That is to say, one optical line terminal can serve multiple users through the optical transmission of the optical fiber distribution network. For optical transmission, it can be regarded as consisting of two parts: the sending of optical signals and the receiving of optical signals. In order to realize the sending and receiving of optical signals, bi-directional Optical sub-assemblies (BOSAs) are configured in the optical line terminal and the optical network unit. The BOSA mainly includes a transmitting optical sub-assembly (TOSA) and a receiving optical sub-assembly (ROSA). The TOSA and the ROSA are encapsulated in a housing. The electrical signal is converted into an optical signal and sent through the TOSA, and the optical signal is received and converted into an electrical signal through the ROSA, thus realizing the sending and receiving of optical signals.

[0042] At present, there are mainly two types of passive optical networks that have been widely deployed, namely Ethernet Passive Optical Network (EPON) and Gigabit Passive Optical Network (GPON). The rates supported by these two passive optical networks are 2.5 Gbit / s or 1.25 Gbit / s. With the upgrade of network bandwidth, the next-generation passive optical networks to be deployed are 10G-EPON and 10G-GPON (also known as XGPON), and the rates supported by these two passive optical networks are 10 Gbit / s. That is to say, the rates supported by the currently widely deployed passive optical networks and the next-generation passive optical networks to be deployed are different. For the sake of clarity and brevity, GPON will be taken as an example for illustration below, and EPON can be considered similarly. In terms of the wavelength of the optical signal, the optical line terminal in GPON sends optical signals with a wavelength of 1490 nm and receives optical signals with a wavelength of 1310 nm. The optical line terminal in XGPON sends optical signals with a wavelength of 1577 nm and receives optical signals with a wavelength of 1270 nm. That is to say, the wavelengths supported by the currently widely deployed passive optical networks and the next-generation passive optical networks to be deployed are also different.

[0043] If the passive optical network needs to be upgraded, considering the cost, it is less likely to rebuild the passive optical network, but will expand on the currently deployed passive optical network. However, for users, not all users will be willing to upgrade. There will inevitably be some users still using GPON, while some other users will upgrade to XGPON. In this way, it is required that the optical transmission component of the optical transceiver component can be applicable to the optical signals corresponding to the wavelengths of both GPON and XGPON, that is, the optical transmission component can send optical signals of two wavelengths. To achieve this goal, in the related technology, the optical transmission component is configured with two optical transmitters, two collimating lenses, and several reflectors. First, the two optical transmitters are used to output optical signals respectively, and the two optical signals are collimated into parallel optical signals through the collimating lenses. Then, through the reflectors, the two optical signals are reflected onto the combiner to use the combiner to combine and output the parallel optical signals. However, the collimating lenses and reflectors will occupy a relatively large layout space, resulting in an oversized size of the optical transmission component.

[0044] To solve this technical problem, the embodiment of the present application provides an optical transmission component, Figure 1 which is a schematic structural diagram of the optical transmission component. In combination with Figure 1, the optical transmission component includes a housing 1, an optical transmission unit 2, and a coupling unit 3. The side wall of the housing 1 has a light output port 11 for facing the first port A' of the optical fiber A. The optical transmission unit 2 is located inside the housing 1. The optical transmission unit 2 includes a first optical transmitter 21 and a second optical transmitter 22. The first optical transmitter 21 is used to transmit a first optical signal, and the second optical transmitter 22 is used to transmit a second optical signal. The coupling unit 3 is located on the side of the optical transmission unit 2 close to the light output port 11. The coupling unit 3 is used to transmit the first optical signal and the second optical signal, so that the first optical signal and the second optical signal converge, and are coupled to the first port A' of the optical fiber A through the light output port 11.

[0045] When transmitting an optical signal through the optical transmission component provided by the embodiment of the present application, the optical transmission unit 2 outputs a first optical signal and a second optical signal to the coupling unit 3 to converge with each other under the action of the coupling unit 3. The converged first optical signal and second optical signal pass through the light output port 11 and are finally coupled to the first port A' of the optical fiber A to further output the first optical signal and the second optical signal through the optical fiber. It can be seen that the optical transmission component provided by the embodiment of the present application can output a first optical signal and a second optical signal through the optical transmission unit 2, and converge the first optical signal and the second optical signal through the coupling unit 3. During the convergence process, the propagation directions of the first optical signal and the second optical signal are not affected by other components except the coupling unit 3. After being transmitted by the coupling unit 3, they directly converge to the first port A' of the optical fiber A, that is, directly coupled to the first port A' of the optical fiber A. Devices such as collimating lenses and mirrors in the related art are eliminated, so that the size of the optical transmission component can be effectively controlled, which is convenient for realizing the miniaturized design of the optical transmission component.

[0046] The mutual convergence of the first optical signal and the second optical signal means that the first optical signal and the second optical signal are emitted from different light sources. After being transmitted by the coupling unit 3, they continue to propagate towards the same target point (the first port A' of the optical fiber A) together until they gradually converge to the target point.

[0047] It should be noted that the optical transmission component provided by the embodiment of the present application can not only be applicable to simultaneously transmit the optical signal corresponding to GPON and the optical signal corresponding to XGPON, but also be applicable to simultaneously transmit at least two or more other optical signals. For example, it can also be applicable to simultaneously transmit the optical signal corresponding to EPON and the optical signal corresponding to 10G-EPON, etc. The present application does not limit this.

[0048] Since the optical transmission unit 2 generates heat during operation, in order to avoid the heat generated by the optical transmission unit 2 affecting the performance of the optical transmission component, see Figure 1, the optical transmission component further includes a temperature control unit 6, which is located in the housing 1 and close to the optical transmission unit 2, and is used to adjust the temperature of the optical transmission unit 2.

[0049] In the above implementation, the temperature control unit 6 is a thermo electric cooler (TEC), which uses the Peltier effect of semiconductor materials to cool down the optical transmission unit 2.

[0050] As can be seen from the foregoing, the coupling unit 3 is a key component for the optical transmission component to achieve miniaturization. Two types of coupling units 3 are provided in the embodiments of the present application, and both of these two types of coupling units 3 can effectively achieve the miniaturization of the optical transmission component. The following will introduce these two types of coupling units 3 respectively.

[0051] Figure 2 is a schematic structural diagram of an optical transmission component having the first coupling unit 3. Combining Figure 2 , in this embodiment, the coupling unit 3 includes a multiplexer 31 and a first lens 32.

[0052] The multiplexer 31 includes a first input port 311, a second input port 312, and an output port 313. The first input port 311, the second input port 312, and the output port 313 are respectively located on the outer sidewall of the multiplexer 31. The first input port 311 is coupled to the first optical transmitter 21, and the second input port 312 is coupled to the second optical transmitter 22. The multiplexer 31 is used to multiplex the first optical signal and the second optical signal, and send the multiplexed first optical signal and second optical signal to the first lens 32. In the above implementation, setting the first input port 311, the second input port 312, and the output port 313 on the outer sidewall of the multiplexer 31 respectively can facilitate the coupling of the first input port 311 with the first optical transmitter 21, the coupling of the second input port 312 with the second optical transmitter 22, and the output of the multiplexed first optical signal and second optical signal from the output port 313.

[0053] The first lens 32 is located on the side of the multiplexer 31 away from the optical transmission unit 2 and on the light output line of the output port 313, so as to converge the first optical signal and the second optical signal output from the output port 313 and couple them to the first port A' of the optical fiber A. The first lens 32 is used to cooperate with the multiplexer 31 to converge the first optical signal and the second optical signal output from the output port 313 and couple them to the first port A' of the optical fiber A.

[0054] The following introduces the process of converging the first optical signal and the second optical signal through the multiplexer 31 and the first lens 32 for the first type of coupling unit 3.

[0055] First, the first input port 311 receives the first optical signal transmitted by the first optical transmitter 21, and the second input port 312 receives the second optical signal transmitted by the second optical transmitter 22, so that the first optical signal and the second optical signal enter the multiplexer 31. Then, under the action of the multiplexer 31, the first optical signal and the second optical signal are multiplexed and output from the output port 313. Finally, the multiplexed first optical signal and second optical signal enter from the side of the first lens 32 close to the multiplexer 31 and are transmitted to the side of the first lens 32 far from the multiplexer 31, so that the first optical signal and the second optical signal are gradually converged under the action of the first lens 32 until they are coupled to the first port A' of the optical fiber A. That is to say, the first coupling unit 3 provided by the embodiment of the present application, through the mutual cooperation between the multiplexer 31 and the first lens 32, first realizes the multiplexing of the first optical signal and the second optical signal, and then converges the multiplexed first optical signal and second optical signal and directly couples them to the first port A' of the optical fiber A, omitting devices such as collimating lenses and mirrors mentioned above, and can effectively realize the miniaturization of the optical transmission component.

[0056] Regarding the type of the multiplexer 31, by way of example, the multiplexer 31 is a planar lightwave waveguide type multiplexer 31, which is based on planar lightwave circuit (PLC) technology. Planar lightwave circuit technology refers to the waveguide technology of arranging optical waveguides on the same plane. Since the optical waveguides of the first optical signal and the second optical signal are on the same plane, it is beneficial to control the size of the multiplexer 31, and thus it is convenient to realize the miniaturized design of the optical transmission component.

[0057] Regarding the structure of the multiplexer 31, there are at least three arrangement ways for the first input port 311, the second input port 312 and the output port 313. The first one is as Figure 2 shown. The first input port 311 and the second input port 312 are located on the same side of the multiplexer 31, and are located on the side of the multiplexer 31 far from the light output port 11, and the output port 313 is located on the side of the multiplexer 31 close to the light output port 11, that is, the output port 313 is located on the opposite side of the multiplexer 31. This arrangement way can make full use of the axial space of the housing 1, facilitate the arrangement of the optical transmission unit 2, the multiplexer 31 and the first lens 32, and is beneficial to the miniaturized design of the optical transmission component. The second one is as Figure 3 shown. The first input port 311 and the second input port 312 are also located on the same side of the multiplexer 31, but the first input port 311 and the second input port 312 are located on the side surface relative to the light output direction of the housing 1, and the position of the output port 313 is the same as that of the first arrangement way, and is still located on the side of the multiplexer 31 close to the light output port 11. The third one is as Figure 4As shown, the first input port 311 and the second input port 312 are respectively located on both sides of the multiplexer 31, and on both sides of the light output direction relative to the housing 1. The position of the output port 313 is the same as that in the first arrangement, and it is still located on the side of the multiplexer 31 close to the light output port 11. This arrangement can make full use of the radial space of the housing 1 and is conducive to the miniaturization design of the optical transmitter module. It should be noted that as the positions of the first input port 311 and the second input port 312 change, in order to facilitate the coupling between the first optical transmitter 21 and the second optical transmitter 22 and the first input port 311 and the second input port 312 respectively, the positions of the first optical transmitter 21 and the second optical transmitter 22 change accordingly.

[0058] The type and structure of the multiplexer 31 were introduced above. Next, the first lens 32 will be introduced.

[0059] Refer to again Figure 2 , for the installation method of the first lens 32, the first lens 32 is installed in the light output port 11. With such a design, the light output port 11 is used as the installation basis for the first lens 32, so that the first lens 32 is accommodated in the light output port 11. That is to say, the first lens 32 can not only converge the first optical signal and the second optical signal, but also seal the light output port 11. In this installation method, when the first optical signal and the second optical signal start to converge through the first lens 32, they are output through the light output port 11 until they are coupled to the first port A' of the optical fiber A.

[0060] Exemplarily, the outer edge of the first lens 32 matches the inner edge of the light output port 11, so that the outer edge of the first lens 32 and the inner edge of the light output port 11 can be fitted together. And for the first lens 32 installed in the light output port 11, its principal optical axis coincides with the central axis of the light output port 11, which is conducive to the output of the first optical signal and the second optical signal through the light output port 11 when they are transmitted through the first lens 32.

[0061] In other embodiments, the first lens 32 can also be installed by Figure 5 the installation method shown. Refer to Figure 5 , the first lens 32 is located in the lumen of the housing 1. The lumen of the housing 1 is the internal space of the housing 1. Arranging the first lens 32 in the lumen of the housing 1 can better protect the first lens 32 and is conducive to the encapsulation of the first lens 32 in the housing 1. In this installation method, the first optical signal and the second optical signal first start to converge through the first lens 32, and during the convergence process, they are output through the light output port 11 until they are coupled to the first port A' of the optical fiber A.

[0062] Exemplarily, the first lens 32 located in the lumen of the housing 1 has its principal optical axis coinciding with the central axis of the light output port 11, which is conducive to the output of the first optical signal and the second optical signal from the light output port 11 after passing through the first lens 32.

[0063] When the first lens 32 is located in the lumen of the housing 1, the light output port 11 is no longer sealed by the first lens 32. In this case, the optical transmitting component further includes a first flat window cap 4 sleeved outside the light output port 11, so that the light output port 11 can be sealed by the first flat window cap 4. The first flat window cap 4 only serves to seal the light output port 11 and does not affect the convergence of the first optical signal and the second optical signal, that is, the first optical signal and the second optical signal directly pass through the first flat window cap 4 and are transmitted out of the housing 1 and coupled to the first port A' of the optical fiber A.

[0064] To achieve the convergence of the first lens 32 for the first optical signal and the second optical signal, the first lens 32 is an aspherical lens. The aspherical lens includes a first curved surface and a second curved surface, and the first curved surface and the second curved surface are respectively located on opposite sides of the aspherical lens. Moreover, both the first curved surface and the second curved surface are convex curved surfaces, that is, the middle part of the first curved surface protrudes away from the second curved surface, and the middle part of the second curved surface protrudes away from the first curved surface.

[0065] Since the first lens 32 is an aspherical lens, the first curved surface and the second curved surface are aspherical surfaces, which can be represented by a formula composed of a conic curve formula (quadratic curve formula) and several higher-order terms, and this formula is called the aspherical lens formula.

[0066] The aspherical lens formula of the first lens 32 is:

[0067]

[0068] Among them, x1 is the abscissa corresponding to the conic curve, y1 is the ordinate corresponding to the conic curve, c1 = 1 / r is the base circle curvature, r is the base circle radius, k1 is the conic constant, k1 = -e 2 , e is the eccentricity, and B1, B2,... are the coefficients of the higher-order terms.

[0069] Exemplarily, the first lens 32 is a glass lens or a resin lens. It is easy to understand that the material of the first lens 32 can be selected according to actual needs. For example, when it is necessary to emphasize that the first lens 32 has characteristics such as high heat resistance, high reliability, and high light transmittance, the first lens 32 is selected as a glass lens. When it is necessary to emphasize that the first lens 32 has characteristics such as low manufacturing cost and low manufacturing difficulty, the first lens 32 is selected as a resin lens. Of course, the first lens 32 can also be selected as a lens of other materials that meet the performance requirements, and the present application does not limit this.

[0070] In addition, when the first lens 32 is a glass lens, it can be manufactured by precision polishing to ensure that the shape of the first lens 32 meets the design requirements and achieve accurate convergence of the first optical signal and the second optical signal. When the first lens 32 is a resin lens, it can be manufactured by injection molding to reduce the manufacturing cost and improve the manufacturing efficiency.

[0071] Figure 6 FIG. 4 is a schematic structural diagram of an optical transmitting component having a second coupling unit 3. Figure 6 In this embodiment, the coupling unit 3 includes a second lens 33 and a third lens 34.

[0072] The second lens 33 faces the first optical transmitter 21 and is located on the light output line of the first optical transmitter 21 to converge the first optical signal transmitted by the first optical transmitter 21 and couple it to the first port A' of the optical fiber A. The third lens 34 faces the second optical transmitter 22 and is located on the light output line of the second optical transmitter 22 to converge the second optical signal transmitted by the second optical transmitter 22 and couple it to the first port A' of the optical fiber A.

[0073] That is to say, in the second coupling unit 3, the first optical signal and the second optical signal are not combined by the combiner 31 first, but the first optical signal and the second optical signal are directly converged by the second lens 33 and the third lens 34 respectively, and finally coupled to the first port A' of the optical fiber A. In this way, it is more conducive to realizing the miniaturized design of the optical transmitting component.

[0074] Moreover, since the second lens 33 is disposed opposite to the first optical transmitter 21 and is located on the light output line of the first optical transmitter 21, it is convenient for the first optical signal output by the first optical transmitter 21 to be converged by the second lens 33. For the same reason, the third lens 34 is disposed opposite to the second optical transmitter 22 and is located on the light output line of the second optical transmitter 22, which is convenient for the second optical signal output by the second optical transmitter 22 to be converged by the third lens 34.

[0075] Next, the process of converging the first optical signal and the second optical signal by the second lens 33 and the third lens 34 in the second coupling unit 3 will be introduced.

[0076] The first optical signal enters from the side of the second lens 33 close to the first optical transmission unit 2 and is transmitted to the side of the second lens 33 far from the first optical transmission unit 2. Under the action of the second lens 33, the first optical signal gradually converges until it is coupled to the first port A' of the optical fiber A. At the same time, the second optical signal enters from the side of the third lens 34 close to the second optical transmission unit 2 and is transmitted to the side of the third lens 34 far from the second optical transmission unit 2. Under the action of the third lens 34, the second optical signal gradually converges until it is coupled to the first port A' of the optical fiber A. That is to say, for the second coupling unit 3 provided in the embodiment of the present application, the first optical signal output by the first optical transmission unit 2 is directly converged by the second lens 33 and directly coupled to the first port A' of the optical fiber A, and the second optical signal output by the second optical transmission unit 2 is directly converged by the third lens 34 and directly coupled to the first port A' of the optical fiber A. This not only omits devices such as the collimating lens and the mirror mentioned above, but also omits the optical combiner 31 in the first coupling unit 3, which is more conducive to realizing the miniaturized design of the optical transmission component.

[0077] Since the second coupling unit 3 can realize the convergence of the first optical signal and the second optical signal only through the second lens 33 and the third lens 34, the second lens 33 and the third lens 34 will be introduced in detail below.

[0078] Continue to refer to Figure 6 , for the arrangement of the second lens 33 and the third lens 34, the principal optical axis L of the second lens 33 and the principal optical axis L' of the third lens 34 intersect on the side far from the optical transmission unit 2. The principal optical axis L of the second lens 33 is located on the first optical transmitter 21, and there is a gap between the principal optical axis L' of the third lens 34 and the second optical transmitter 22.

[0079] It can be seen that since the principal optical axis L of the second lens 33 and the principal optical axis L' of the third lens 34 intersect on the side far from the optical transmission unit 2, the second lens 33 and the third lens 34 are arranged obliquely to each other. This can not only transmit the first optical signal and the second optical signal respectively to avoid interference between the first optical signal and the second optical signal, but also make more flexible use of the space in the cavity of the housing 1, avoiding the difficulty in realizing the miniaturized design of the optical transmission component due to the side-by-side arrangement of the second lens 33 and the third lens 34.

[0080] In addition, since the principal optical axis L of the second lens 33 is located on the first optical transmitter 21, and there is a gap between the principal optical axis L' of the third lens 34 and the second optical transmitter 22, the second lens 33 is more suitable for optical signals with higher coupling efficiency. For example, the first optical transmitter 21 is used to transmit a first optical signal with a wavelength of 1490 nm corresponding to GPON, and the second optical transmitter 22 is used to transmit a second optical signal with a wavelength of 1577 nm corresponding to XGPON. In this way, the first optical signal with a smaller wavelength can obtain a higher coupling efficiency.

[0081] Continue to refer to Figure 6 , for the installation methods of the second lens 33 and the third lens 34, the second lens 33 and the third lens 34 are embedded in the light output port 11. With such a design, the light output port 11 is used as the installation basis for the second lens 33 and the third lens 34, so that the second lens 33 and the third lens 34 are accommodated in the light output port 11. That is to say, the second lens 33 and the third lens 34 can not only converge the first optical signal and the second optical signal, but also seal the light output port 11. In this installation method, when the first optical signal and the second optical signal start to converge through the second lens 33 and the third lens 34, they are output through the light output port 11 until they are coupled to the first port A' of the optical fiber A.

[0082] Exemplarily, the outer edges of the second lens 33 and the third lens 34 match the inner edge of the light output port 11, so that the outer edges of the second lens 33 and the third lens 34 and the inner edge of the light output port 11 can be fitted together, which is beneficial to the output of the first optical signal and the second optical signal through the light output port 11 when they are transmitted through the second lens 33 and the third lens 34.

[0083] In other embodiments, the second lens 33 and the third lens 34 can also be installed by Figure 7 the installation method shown. Refer to Figure 7 , the second lens 33 and the third lens 34 are located in the lumen of the housing 1. Arranging the second lens 33 and the third lens 34 in the lumen of the housing 1 can better protect the second lens 33 and the third lens 34 and is beneficial to the encapsulation of the second lens 33 and the third lens 34 in the housing 1. In this installation method, the first optical signal and the second optical signal first start to converge through the second lens 33 and the third lens 34, and during the convergence process, they are output through the light output port 11 until they are coupled to the first port A' of the optical fiber A.

[0084] When the second lens 33 and the third lens 34 are located in the lumen of the housing 1, the light exit 11 is no longer sealed by the second lens 33 and the third lens 34. In this case, the optical transmission component further includes a second flat window cap 5, which is sleeved outside the light exit 11 to seal the light exit 11. With such a design, the second lens 33 and the third lens 34 can be located in the lumen of the housing 1 without being embedded in the light exit 11 of the housing 1. The second flat window cap 5 only serves to seal the light exit 11 and does not affect the convergence of the first optical signal and the second optical signal. That is, the first optical signal and the second optical signal directly pass through the second flat window cap 5 and are transmitted out of the housing 1 and coupled to the first port A' of the optical fiber A.

[0085] In order to achieve the convergence of the first optical signal and the second optical signal by the second lens 33 and the third lens 34, the second lens 33 and the third lens 34 are aspherical lenses. The second lens 33 and the third lens 34 are similar in shape to the first lens 32 and are also biconvex lenses.

[0086] The structures of the second lens 33 and the third lens 34 are similar to that of the first lens 32 and will not be elaborated here. The second lens 33 and the third lens 34 can also be represented by the aspherical lens formula.

[0087] The aspherical lens formula of the second lens 33 is:

[0088]

[0089] where x2 is the abscissa corresponding to the conic curve, y2 is the ordinate corresponding to the conic curve, c2 = 1 / r is the base circle curvature, r is the base circle radius, k2 is the conic constant, k2 = -e 2 , e is the eccentricity, and B1, B2,... are the polynomial coefficients.

[0090] The aspherical lens formula of the third lens 34 is:

[0091]

[0092] where x3 is the abscissa corresponding to the conic curve, y3 is the ordinate corresponding to the conic curve, c3 = 1 / r is the base circle curvature, r is the base circle radius, k3 is the conic constant, k3 = -e 2 , e is the eccentricity, and B1, B2,... are the polynomial coefficients.

[0093] Exemplarily, the second lens 33 and the third lens 34 are an integral structural member. With such a design, not only can the structures of the second lens 33 and the third lens 34 be made more compact to facilitate the miniaturization design of the optical transmission component, but also the manufacturing efficiency of the second lens 33 and the third lens 34 can be improved by using the integral molding technology.

[0094] Exemplarily, the second lens 33 and the third lens 34 are made of the same material, which is a glass lens or a resin lens. It is easy to understand that the materials of the second lens 33 and the third lens 34 can be selected according to actual requirements. For example, when it is necessary to emphasize that the second lens 33 and the third lens 34 have characteristics such as high heat resistance, high reliability, and high light transmittance, the second lens 33 and the third lens 34 are selected as glass lenses. When it is necessary to emphasize that the second lens 33 and the third lens 34 have characteristics such as low manufacturing cost and low manufacturing difficulty, the second lens 33 and the third lens 34 are selected as resin lenses. Of course, the second lens 33 and the third lens 34 can also be selected as lenses made of other materials that meet the performance requirements, and this application does not limit this.

[0095] In addition, when the second lens 33 and the third lens 34 are glass lenses, they can be manufactured by precision polishing and forming to ensure that the shapes of the second lens 33 and the third lens 34 can meet the design requirements and achieve the accurate convergence of the first optical signal and the second optical signal. When the second lens 33 and the third lens 34 are resin lenses, they can be manufactured by injection molding in one piece, thereby reducing the manufacturing cost and improving the manufacturing efficiency.

[0096] The two implementation methods of the coupling unit 3 are introduced above respectively. For the first type of coupling unit 3, through the mutual cooperation between the multiplexer 31 and the first lens 32, the multiplexing of the first optical signal and the second optical signal is first realized, and then the multiplexed first optical signal and second optical signal are converged and directly coupled to the first port A' of the optical fiber A. For the second type of coupling unit 3, the first optical signal and the second optical signal are directly converged by the second lens 33 and the third lens 34 and finally coupled to the first port A' of the optical fiber A. Both of these two types of coupling units 3 can effectively realize the miniaturization of the optical transmission component.

[0097] Next, Figure 1 will be used to introduce the package 1 and the optical transmission unit 2 again.

[0098] The shape of the package 1 is determined by the package type of the optical transmission component. When the optical transmission component is in a transistor-outline can (TO CAN) package, the package 1 is a cylindrical housing 10 with one end open. The open end of the package 1 is welded to a socket with metal pins to form a transistor-outline package, and the light output port 11 is arranged at the other end of the package 1. And, in order to prevent devices such as the optical transmission unit 2 and the coupling unit 3 from deteriorating due to factors such as water vapor and oxygen in the external environment, a hermetic packaging process is generally adopted, that is, in a pure nitrogen environment, the package 1 and the socket are welded and packaged together. Of course, in addition to the transistor-outline package, the optical transmission component can also be a butterfly package, a box package, etc., and this application does not limit this.

[0099] The first optical transmitter 21 and the second optical transmitter 22 of the optical transmission unit 2 are laser diodes to realize the transmission of the first optical signal and the second optical signal. It is easy to understand that the first optical transmitter 21 and the second optical transmitter 22 are connected to the header to receive electrical signals and convert the received electrical signals into the first optical signal and the second optical signal. Additionally, in other embodiments, the optical transmission unit 2 is not limited to including only two optical transmitters, namely the first optical transmitter 21 and the second optical transmitter 22, but can also include other numbers of optical transmitters according to requirements, such as 3, 4, etc., and the present application does not limit this.

[0100] As can be seen from the foregoing, the optical transmission component is one of the components of the optical transceiver component. Next, the optical transceiver component including the above optical transmission component will be introduced.

[0101] Figure 8 FIG. 9 is a schematic structural diagram of an optical transceiver component provided by an embodiment of the present disclosure. The optical transceiver component includes a housing 10, an optical transmission component 20, an optical reception component 30, and a wavelength division multiplexer 40.

[0102] The housing 10 has a cavity 101. The side wall of the housing 10 has an optical transmission port 102, an optical reception port 103, and an optical fiber connection port 104. The optical transmission port 102, the optical reception port 103, and the optical fiber connection port 104 are respectively in communication with the cavity 101. The optical fiber connection port 104 is used to accommodate the first port A' of the optical fiber A. The optical transmission component 20 is the above optical transmission component 20, and the optical transmission component 20 is located in the optical transmission port 102. The optical reception component 30 is located in the optical reception port 103. The wavelength division multiplexer 40 is located in the cavity 101. The wavelength division multiplexer 40 is used to transmit the first optical signal and the second optical signal emitted by the optical transmission component 20 to the first port A' of the optical fiber A, and reflect the third optical signal and the fourth optical signal emitted by the first port A' of the optical fiber A to the optical reception component 30.

[0103] Through the optical transceiver component provided by the embodiment of the present application, the transmission and reception of optical signals can be realized. For the transmission of optical signals, the converging first optical signal and second optical signal are output by the optical transmission component 20. The converging first optical signal and second optical signal pass through the wavelength division multiplexer 40 and are coupled to the first port A' of the optical fiber A, thereby realizing the transmission of the first optical signal and the second optical signal. For the reception of optical signals, the third optical signal and the fourth optical signal are output by the first port A' of the optical fiber A. The third optical signal and the fourth optical signal are reflected by the wavelength division multiplexer 40 and are coupled to the optical reception component 30, thereby realizing the reception of the third optical signal and the fourth optical signal. Moreover, since the optical transmission component 20 is the above optical transmission component 20, the size of the optical transmission component 20 is small, so that the size of the optical transceiver component can be effectively controlled, facilitating the realization of the miniaturized design of the optical transceiver component.

[0104] The cavity 101 is used to provide a transmission space for optical signals. Exemplarily, the cavity 101 includes a first optical channel 1011 and a second optical channel 1012. One end of the first optical channel 1011 is connected to the optical transmission port 102, and the other end is connected to the optical fiber connection port 104. One end of the second optical channel 1012 is connected to the optical reception port 103, and the other end is connected to the first optical channel 1011. The optical splitter 40 is located at the connection of the first optical channel 1011 and the second optical channel 1012.

[0105] Thus, it can be seen that the first optical channel 1011 connects the optical transmission port 102 and the optical fiber connection port 104, and the second optical channel 1012 connects the optical reception port 103 and the first optical channel 1011. By setting the optical splitter 40 at the connection of the first optical channel 1011 and the second optical channel 1012, the optical splitter 40 can transmit the first optical signal and the second optical signal output at the optical transmission port 102 to the first port A' of the optical fiber A, and reflect the third optical signal and the fourth optical signal output at the first port A' of the optical fiber A to the optical reception port, so as to realize the transmission of at least two different optical signals and the reception of at least two different optical signals.

[0106] As can be seen from the foregoing, the optical transceiver component is one of the components of the optical line terminal 100. An embodiment of the present application further provides an optical line terminal 100, which includes a chassis and the above optical transceiver component, and the optical transceiver component is accommodated in the chassis. Through the optical transceiver component, the optical line terminal 100 can realize the transmission of at least two different optical signals and the reception of at least two different optical signals. Moreover, since the optical transceiver component is the above optical transceiver component, the size of the optical transceiver component is small, so that the size of the optical line terminal 100 can be effectively controlled, which is convenient for realizing the miniaturized design of the optical line terminal 100.

[0107] As can be seen from the foregoing, the optical line terminal 100 is one of the components of the passive optical network system. The following introduces the passive optical network system including the above optical line terminal 100.

[0108] Figure 9 FIG. is a networking schematic diagram of a passive optical network system provided by an embodiment of the present disclosure. The passive optical network system includes an optical line terminal 100, an optical distribution network 200, and at least two optical network units 300. The optical line terminal 100 is the above optical line terminal 100, and each optical network unit 300 is respectively connected to the optical line terminal 100 through the optical distribution network 200.

[0109] Since the optical line terminal 100 is the above-mentioned optical line terminal 100, it has all the beneficial effects of the above-mentioned optical line terminal 100. The optical distribution network 200 is connected between the optical line terminal 100 and each optical network unit 300, and is used to provide an optical transmission channel between the optical line terminal 100 and each optical network unit 300. The passive optical network system sends the first optical signal and the second optical signal to the first port A' of the optical fiber A through the optical line terminal 100, and then sequentially transmits them to each optical network unit 300 through the second port of the optical fiber A and the optical distribution network 200. The passive optical network system receives the third optical signal and the fourth optical signal sent by each optical network unit 300 and transmitted by the optical distribution network 200 through the optical line terminal 100, that is, the transmission of at least two different optical signals and the reception of at least two different optical signals are realized.

[0110] The above specific implementation manners further elaborate on the purpose, technical solutions, and beneficial effects of the present application. It should be understood that the above are only the specific implementation manners of the present application and are not used to limit the protection scope of the present application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the present application shall be included in the protection scope of the present application.

Claims

1. An optical transmission component, characterized in that, It includes a package (1), an optical transmitting unit (2) and a coupling unit (3); The side wall of the package (1) has a light outlet (11), and the light outlet (11) is used to face the first port (A') of the optical fiber (A); The optical transmitting unit (2) is located inside the package (1). The optical transmitting unit (2) includes a first optical transmitter (21) and a second optical transmitter (22). The first optical transmitter (21) is used to transmit a first optical signal, and the second optical transmitter (22) is used to transmit a second optical signal; The coupling unit (3) is located on the side of the optical transmitting unit (2) close to the light outlet (11). The coupling unit (3) is used to transmit the first optical signal and the second optical signal, so that the first optical signal and the second optical signal converge and propagate together towards the first port (A') until the first optical signal and the second optical signal are coupled to the first port (A') through the light outlet (11).

2. The optical transmission component according to claim 1, characterized in that, The coupling unit (3) includes a wavelength division multiplexer (31) and a first lens (32); The wavelength division multiplexer (31) includes a first input port (311), a second input port (312) and an output port (313). The first input port (311), the second input port (312) and the output port (313) are respectively located on the outer side wall of the wavelength division multiplexer (31). The first input port (311) is coupled to the first optical transmitter (21), and the second input port (312) is coupled to the second optical transmitter (22); The first lens (32) is located on the side of the wavelength division multiplexer (31) away from the optical transmitting unit (2) and on the light output line of the output port (313) to converge the first optical signal and the second optical signal output from the output port (313) and couple them to the first port (A').

3. The optical transmission component according to claim 2, characterized in that The wavelength division multiplexer (31) is a planar lightwave circuit type wavelength division multiplexer.

4. The optical transmission component according to claim 2, wherein The first lens (32) is embedded in the light outlet (11).

5. The optical transmission component according to claim 2, characterized in that, The first lens (32) is located in the cavity of the package (1).

6. The optical transmission component according to claim 5, characterized in that, The optical transmitting assembly further includes a first flat window cap (4), and the first flat window cap (4) is sleeved outside the light outlet (11).

7. The optical transmission component according to claim 1, wherein The coupling unit (3) includes a second lens (33) and a third lens (34); The second lens (33) is opposite to the first optical transmitter (21) and is located on the light output line of the first optical transmitter (21) to converge the first optical signal transmitted by the first optical transmitter (21) and couple it to the first port (A'); The third lens (34) is opposite to the second optical transmitter (22) and is located on the light output line of the second optical transmitter (22) to converge the second optical signal transmitted by the second optical transmitter (22) and couple it to the first port (A').

8. The optical transmission component according to claim 7, characterized in that, The principal optical axis (L) of the second lens (33) and the principal optical axis (L') of the third lens (34) intersect on the side away from the optical transmission unit (2). The principal optical axis (L) of the second lens (33) is located on the first optical transmitter (21), and there is a gap between the principal optical axis (L') of the third lens (34) and the second optical transmitter (22).

9. The optical transmission component according to claim 7, wherein The second lens (33) and the third lens (34) are fitted in the light outlet (11).

10. The optical transmission component according to claim 7, characterized in that, The second lens (33) and the third lens (34) are located in the cavity of the housing (1).

11. The optical transmission component according to claim 10, characterized in that, The optical transmission assembly further includes a second flat window cap (5), and the second flat window cap (5) is sleeved outside the light outlet (11).

12. The optical transmission component according to claim 7, wherein The second lens (33) and the third lens (34) are an integral structural member.

13. The optical transmission component according to any one of claims 1-12, characterized in that, The optical transmission assembly further includes a temperature control unit (6). The temperature control unit (6) is located inside the housing (1) and close to the optical transmission unit (2), and the temperature control unit (6) is used to adjust the temperature of the optical transmission unit (2).

14. An optical transceiver module, characterized in that, Comprising: A housing (10), an optical transmission assembly (20), an optical reception assembly (30), and a wavelength division multiplexer (40); The housing (10) has a cavity (101). The side wall of the housing (10) has an optical transmission port (102), an optical reception port (103), and an optical fiber connection port (104). The optical transmission port (102), the optical reception port (103), and the optical fiber connection port (104) are respectively communicated with the cavity (101), and the optical fiber connection port (104) is used to accommodate the first port (A') of the optical fiber (A). The optical transmission assembly (20) is the optical transmission assembly (20) according to any one of claims 1-13, and the optical transmission assembly (20) is located inside the optical transmission port (102). The optical reception assembly (30) is located inside the optical reception port (103). The wavelength division multiplexer (40) is located inside the cavity (101). The wavelength division multiplexer (40) is used to transmit the first optical signal and the second optical signal emitted by the optical transmission assembly (20) to the first port (A'), and reflect the third optical signal and the fourth optical signal emitted by the first port (A') to the optical reception assembly (30).

15. The optical transceiver module according to claim 14, characterized in that, The cavity (101) includes a first optical channel (1011) and a second optical channel (1012). One end of the first optical channel (1011) is communicated with the optical transmission port (102), and the other end is communicated with the optical fiber connection port (104). One end of the second optical channel (1012) is communicated with the optical reception port (103), and the other end is communicated with the first optical channel (1011). The wavelength division multiplexer (40) is located at the communication place of the first optical channel (1011) and the second optical channel (1012).

16. An optical line terminal, characterized in that, An optical transceiver assembly according to claim 14 or 15.

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