Optical module and optical communication equipment

Abstract

The invention provides an optical module and optical communication equipment, the optical module comprises a first optical transmitter, a second optical transmitter, a polarization beam combiner and an interface, the first optical transmitter is used for transmitting first signal light propagating along a first direction, and the polarization state of the first signal light is a first polarization state; the second light emitter is used for emitting second signal light propagating along a second direction, and the polarization state of the second signal light is a second polarization state; the polarization beam combiner is used for receiving the first signal light and the second signal light, combining the first signal light and the second signal light into mixed light, and transmitting the mixed light to the interface. On the basis of a wavelength division multiplexing scheme of a passive optical network at present, two optical transmitters are combined into one path by utilizing a polarization coupling scheme, so that the isolation degree between signal light of a current multi-transmission scheme is ensured, the complexity of an internal optical path is reduced, and a multi-transmission form optical module scheme with high transmission quality, low crosstalk and high integration level is realized.

Description

Technical Field

[0001] This application relates to the field of optical communication, and in particular, to an optical module and an optical communication device. Background Art

[0002] In the background of FTTX, with the rapid development of high-bandwidth access services, the current mainstream PONs are difficult to meet the service requirements. Gigabit Passive Optical Network (G-PON), Asymmetric Gigabit Passive Optical Network (XG-PON), and Symmetric Gigabit Passive Optical Network (XGS-PON) are the technological evolutions of PONs, which further improve the transmission rate of services. In addition to the above network solutions, the Hybrid Passive Optical Network (Combo PON) is a passive optical network that supports multiple PON protocols. Combo PON can internally multiplex G-PON, XG-PON, XGS-PON, etc., support the coexistence of multi-rate modes, and thus smoothly upgrade to a higher-rate optical network. However, in the current broadband optical access network system, wavelength division multiplexing and multiplexing schemes are mostly adopted, which may lead to problems such as light concentration and signal crosstalk if the signal lights of the internal multiplexing have similar wavelengths in the optical line terminal, optical network unit, and optical network terminal. In addition, when integrating multiple optical transmitters and optical receivers together, in order to arrange the coupling optical paths of multiple signal lights, the optical devices have problems such as large volume, high cost, and inconvenient use. Summary of the Invention

[0003] This application provides an optical module and an optical communication device. Based on the wavelength division multiplexing scheme of the passive optical network, a polarization coupling scheme is added to implement a multi-transmission form optical device scheme with low crosstalk, high reliability, and small volume.

[0004] In a first aspect, an optical module is provided, including a first optical transmitter, a second optical transmitter, a polarization beam combiner, and an interface, where: the first optical transmitter is configured to emit a first signal light propagating in a first direction, and the polarization state of the first signal light is a first polarization state; the second optical transmitter is configured to emit a second signal light propagating in a second direction, and the polarization state of the second signal light is a second polarization state, and the first direction and the second direction are not parallel; the polarization beam combiner is configured to receive the first signal light and the second signal light, combine the first signal light and the second signal light into a mixed light, and emit the mixed light to the interface; the interface is configured to connect to an optical transmission medium.

[0005] Based on the wavelength division multiplexing scheme of the current passive optical network, the polarization coupling scheme is used to multiplex two optical transmitters into one path, ensuring the isolation between the signal lights of the current multi-transmission scheme, reducing the complexity of the internal optical path, and implementing a multi-transmission form optical module scheme with high transmission quality, low crosstalk, and high integration.

[0006] In combination with the first aspect, in some implementations of the first aspect, the wavelengths and / or rates of the first signal light and the second signal light are different. In some implementations, based on the different polarization states of the first signal light and the second signal light, the wavelengths of the first signal light and the second signal light are different, so as to ensure that the optical module is compatible with the existing wavelength division multiplexing mode when the optical module is applied to a passive optical network. In some implementations, based on the different polarization states of the first signal light and the second signal light, the rates of the first signal light and the second signal light are different. Thus, the optical module can be applied to a multi-rate modal coexistence scheme and is compatible with more optical network schemes.

[0007] In combination with the first aspect, in some implementations of the first aspect, the wavelength interval between the first signal light and the second signal light is less than 40 nm. In this wavelength interval case, there will be losses when the signal light emitted by the first optical transmitter and the combined signal light emitted by the second optical transmitter are combined. A more complex optical path structure is required. By using polarization multiplexing, the optical path can be simplified and the overall volume of the optical module can be reduced.

[0008] In combination with the first aspect, in some implementations of the first aspect, the polarization beam combiner includes a first light input surface, a second light input surface, and a light output surface. The first light input surface is used to receive the first signal light, the second light input surface is used to receive the second signal light, and the light output surface is used to emit the mixed light; the first light input surface and the light output surface are arranged in parallel or coincide, or the second light input surface and the light output surface are arranged in parallel or coincide. Thereby reducing the optical loss caused by polarization beam combination and simplifying the optical path complexity in the optical module. In addition, using a polarizer can reduce the overall cost of the optical module and facilitate the arrangement of the polarization beam combiner in the optical module.

[0009] In combination with the first aspect, in some implementations of the first aspect, the polarization beam combiner is a polarizer. The polarizer is used to transmit the first signal light, and the polarizer is also used to reflect the second signal light.

[0010] In combination with the first aspect, in some implementations of the first aspect, it further includes an optical receiver and a wavelength division multiplexer, where: the optical transmission medium is used to transmit the third signal light, and the interface is used to emit the third signal light; the wavelength division multiplexer is used to receive the third signal light, perform wavelength division processing on the third signal light, and emit the fourth signal light with the first wavelength in the third signal light; the optical receiver is used to receive the fourth signal light and convert the fourth signal light into an electrical signal. By adopting a polarization coupling scheme for the signal light sent by the optical transmitter and a wavelength division multiplexing scheme for the signal light received by the optical receiver, the complexity of the internal optical path is reduced.

[0011] In combination with the first aspect, in some implementations of the first aspect, the wavelength division multiplexer emits a fourth optical signal in the third direction, and any two of the first direction, the second direction, and the third direction are non-parallel. That is, the ports for transmitting or receiving optical signals are respectively located in three different dimensions. Compared with an optical module with multiple ports arranged on the same two-dimensional plane, the device size is reduced and the device space is fully utilized.

[0012] In combination with the first aspect, in some implementations of the first aspect, the optical receiver is in a dual-receiving form.

[0013] In combination with the first aspect, in some implementations of the first aspect, it further includes a housing, which is a polyhedron composed of multiple planes. The first optical transmitter, the second optical transmitter, and the optical receiver are respectively located in different planes among the multiple planes. Thus, the different-dimensional spaces of the housing are fully utilized, and the device integration degree is improved.

[0014] In combination with the first aspect, in some implementations of the first aspect, the housing is a cube or a cuboid. In the current two-dimensional optical module solution, devices such as optical transmitters and optical receivers need to be connected to a single board using flexible printed circuit connectors, which is not conducive to the installation and integration of the optical module. However, the three-dimensional optical module solution of this application does not require the use of connectors, facilitating the on-board installation of the optical module.

[0015] In a second aspect, there is provided an optical communication device, including N single boards, and each single board among the N single boards includes at least one optical module as in the first aspect and any of its possible implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic internal structure diagram of an optical module provided by an embodiment of the present application.

[0017] Figure 2 is a schematic internal structure diagram of another optical module provided by an embodiment of the present application.

[0018] Figure 3 is a schematic internal structure diagram of an optical receiver in a dual-receiving form provided by an embodiment of the present application.

[0019] Figure 4 is a schematic overall structure diagram of an optical module provided by an embodiment of the present application.

[0020] Figure 5 is an optical communication device provided by an embodiment of the present application.

[0021] Figure 6 is a schematic networking structure diagram of an optical network provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0023] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0024] The reference to "one embodiment" or "some embodiments" etc. described in this specification means that a specific feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprise", "include", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized.

[0025] In the description of the embodiments of the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", etc. is defined relative to the orientation or position where the components in the drawings are schematically placed. It should be understood that these directional terms are relative concepts, and they are used for relative description and clarification, rather than indicating or implying that the indicated device or component must have a specific orientation, or be constructed and operated in a specific orientation. It can change accordingly with the change of the orientation where the components in the drawings are placed, and thus should not be construed as a limitation to the present application.

[0026] The terms "include" and "have" and any variants thereof in the embodiments of the present application shown below are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0027] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or explanations. An embodiment or design described as "exemplary" or "for example" should not be construed as being more preferred or having more advantages than other embodiments or designs. The use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific way for easy understanding.

[0028] A passive optical network (PON) is an access network technology that typically includes an optical line termination (OLT), an optical distribution network (ODN), and an optical network unit (ONU). The optical line termination is connected to multiple optical network units in a point-to-multipoint form through the optical distribution network. A passive optical network system is a communication network that does not require any active devices to achieve data distribution between the optical line termination and the optical network unit. The data distribution between the optical line termination and the optical network unit can be achieved through passive optical devices (such as splitters) in the optical distribution network. For example, communication between the optical line termination and the optical network unit can be carried out using a time division multiplexing (TDM) mechanism, a wavelength division multiplexing (WDM) mechanism, or a TDM / WDM hybrid mechanism.

[0029] FTTX is a general term for various application types of broadband optical access networks. "X" has multiple variants, which can be fiber to the building (FTTB), fiber to the curb (FTTC), fiber to the home (FTTH), fiber to the room (FTTR), etc. The FTTX technology range extends from the central office equipment in the regional telecommunications room to the user terminal equipment, including the optical line termination, the optical network unit, and the optical network terminal (ONT).

[0030] FTTH technology has been developed for nearly two decades. Currently, except for some old residential areas, most households are connected to FTTH broadband. In recent years, the speed of home broadband has been continuously increasing. 500M / 1000M broadband has been widely popularized, and 2000M broadband has also started pilot projects. At the same time, operators have begun to promote "FTTR broadband". Based on FTTH, FTTR further extends the optical fiber to each room through the transfer of the main optical modem, and then installs an optical port router in the rooms where needed, transforming the incomplete indoor wired network into a complete all-optical network. FTTR has prominent advantages. Firstly, it has a higher upload and download speed. Most households generally use Category 5 Ethernet cables, which only support speeds up to 100 megabits per second, while optical fibers can support up to 10 gigabits per second of wired speed. Combined with the latest WiFi 6 router, it can achieve an Internet speed of "10 gigabit wired + 1 gigabit wireless" throughout the home local area network, which is a qualitative improvement compared to the previous "100 megabit wired + 100 megabit wireless". That is to say, it is equivalent to equipping each room with a high-speed wired network, and combined with the optical router, it can achieve full coverage of high-speed network in both wired and wireless modes. At the same time, multiple optical routers can also improve the network access capacity, providing a better user experience for smart home devices.

[0031] In the background technology of FTTX, with the rapid development of high-bandwidth access services, the current mainstream PON is difficult to meet the service requirements. Gigabit Passive Optical Network (G-PON), Asymmetric Gigabit Passive Optical Network (XG-PON), and Symmetric Gigabit Passive Optical Network (XGS-PON), as the technological evolution of PON, have further improved the service transmission rate. In addition to the above network solutions, Hybrid Passive Optical Network (Combo PON) is a passive optical network that supports multiple PON protocols. Combo PON can internally multiplex G-PON, XG-PON, XGS-PON, etc., support the coexistence of multi-rate modes, and thus smoothly upgrade to a higher-speed optical network. However, in the current broadband optical access network system, most adopt wavelength division multiplexing and multiplexing schemes. This results in problems such as light concentration and signal crosstalk in the optical line terminal, optical network unit, and optical network terminal if the signal lights of the internal multiplexing are close in wavelength. In addition, when integrating multiple optical transmitters and optical receivers together, in order to arrange the coupling optical paths of multiple signal lights, the optical devices have problems such as large volume, high cost, and inconvenient use.

[0032] In view of this, the present application provides an optical module and an optical communication device. Based on the wavelength division multiplexing scheme of the passive optical network, a polarization coupling scheme is added to achieve a multi-transmission form optical device scheme with low crosstalk, high reliability, and small volume.

[0033] Figure 1 It is a schematic internal structure diagram of an optical module provided by an embodiment of the present application. As Figure 1As shown, the optical module includes a first optical transmitter 110, a second optical transmitter 120, a polarization beam combiner 130, and an interface 140.

[0034] Among them, the first optical transmitter 110 is used to emit a first signal light propagating in a first direction, and the polarization state of the first signal light is a first polarization state. The second optical transmitter 120 is used to emit a second signal light propagating in a second direction, and the polarization state of the second signal light is a second polarization state. Among them, the first polarization state and the second polarization state are different.

[0035] Among them, the optical transmitters in the first optical transmitter 110 and the second optical transmitter 120 may specifically include optical chips, and the optical chips are intercepted with electrical chips. The electrical chip is used to generate an electrical signal according to data, and the optical chip is used to generate a corresponding signal light according to the electrical signal. The optical chip is used to emit a signal light with a polarization state.

[0036] There may be a gap between any two of the first optical transmitter 110, the second optical transmitter 120, the polarization beam combiner 130, and the interface 140. The first optical transmitter 110 and the polarization beam combiner 130 are arranged at intervals along the first direction. The second optical transmitter 120 and the polarization beam combiner 130 are arranged at intervals along the second direction. The first direction and the second direction are not parallel. In some implementation manners, as Figure 1 shown in (a) Figure 1 and Figure 1 shown in (b), the first direction and the second direction are in the same plane, that is, the signal light directions emitted by the first optical transmitter 110 and the second optical transmitter 120 are in the same plane. In some implementation manners, as

[0037] shown in (c), the first direction and the second direction are in different planes. The signal light emitted by the first optical transmitter 110 is in the first plane, and the signal light emitted by the second optical transmitter 120 is in the second plane, and the first plane and the second plane intersect or are perpendicular.

[0038] In some implementations, based on the different polarization states of the first signal light and the second signal light, the speeds of the first signal light and the second signal light are different. Thus, the optical module can be applied to a multi-rate modal coexistence scheme and be compatible with more optical network schemes.

[0039] The polarization beam combiner 130 is used to receive the first signal light and the second signal light, combine the first signal light and the second signal light into a mixed light, and emit the mixed light to the interface 140. Among them, the polarization beam combiner 130 can be optical glass, and the specific form of the polarization beam combiner 130 is determined according to the actual situation. In addition, according to the specific scenario, the polarization beam combiner can also be understood as a polarization beam splitter, a polarization combiner / splitter, a polarization filter, etc., and this application does not limit this.

[0040] In some implementations, as Figure 1 shown in (a) of, the polarization beam combiner 130 is in the form of a polarizer. For example, the polarizer can specifically be a dichroic polarizer, a thin film polarizer, a glass sheet coated with a dielectric coating, etc., which is determined according to the actual situation. The polarizer can include a first light incident surface 131, a second light incident surface 132, and a light output surface 133. The first light incident surface 131 is used to receive the first signal light, the second light incident surface 132 is used to receive the second signal light, and the light output surface 132 is used to emit the mixed light. Among them, the first light incident surface 131 and the light output surface 133 are parallel, and the second light incident surface 132 and the light output surface 133 coincide. The polarizer can specifically be used to transmit the first signal light, and the polarizer is also used to reflect the second signal light. That is, the incident direction of the first signal light on the polarization beam splitter 130 is the same as the output direction of the mixed light on the light output surface 133. Thus, the optical loss caused by polarization beam combination is reduced, and the complexity of the optical path in the optical module is simplified. In addition, using a polarizer can reduce the overall cost of the optical module and facilitate the arrangement of the polarization beam combiner in the optical module. In some implementations, the incident angle when the first signal light or the second signal light is incident on the polarizer is less than 50 degrees, so as to realize the polarization beam combination of the first signal light and the second signal light and output the mixed light to the interface. In some implementations, the incident angle is 45 degrees.

[0041] In some implementations, as Figure 1As shown in (b) or (c), the polarization beam combiner 130 is in the form of a prism. For example, the polarization beam combiner 130 can specifically be a Wollaston prism, a Glan Thompson prism, a Glan-Foucault prism, a Glan Taylor prism, etc., which is determined according to the actual situation. In addition, the polarization beam combiner 130 can also be a combination of multiple prisms. The prisms among the multiple prisms can be in close contact or have a gap, and this application does not limit this. The prism can include a first light incident surface 131, a second light incident surface 132, and a light output surface 133. The first light incident surface 131 is used to receive the first signal light, the second light incident surface 132 is used to receive the second signal light, and the light output surface 132 is used to emit the mixed light.

[0042] Among them, the first light incident surface 131 and the light output surface 133 can be parallel. That is, the incident direction of the first signal light on the polarization beam splitter 130 is the same as the output direction of the mixed light on the light output surface 133. Thereby reducing the optical loss caused by polarization beam combination and simplifying the optical path complexity in the optical module. In some implementation manners, the angle of the polarization prism is less than 50 degrees, so as to realize the polarization beam combination of the first signal light and the second signal light and output the mixed light to the interface. In some implementation manners, the angle of the polarization prism is 45 degrees.

[0043] The interface 140 is used to connect the optical transmission medium. The optical transmission medium can be an optical fiber. Specifically, the interface 140 is connected to the pigtail of a single fiber.

[0044] In the optical module as shown in Figure 1 , based on the wavelength division multiplexing scheme of the current passive optical network, the polarization coupling scheme is used to combine the two optical transmitters into one path, ensuring the isolation between the signal lights in the current multiple transmission scheme, reducing the complexity of the internal optical path, and realizing an optical module scheme with high transmission quality, low crosstalk, and high integration for multiple transmissions.

[0045] Figure 2 It is a schematic diagram of the internal structure of another optical module provided by an embodiment of this application. Figure 2 In (a) and Figure 2 In (b), the three-dimensional optical paths in the optical module are shown at two different angles respectively. Among them, the optical module includes a first optical transmitter 210, a second optical transmitter 220, a polarization beam combiner 230, an interface 240, a wavelength division multiplexer 250, and an optical receiver 260. Among them, the first optical transmitter 210, the second optical transmitter 220, and the polarization beam combiner 230 are similar to those in Figure 1 , and will not be elaborated here.

[0046] Among them, the optical transmission medium connected to the interface 240 is used to transmit the third signal light, and the interface 240 is used to emit the third signal light.

[0047] The wavelength division multiplexer 250 is used to receive the third optical signal, perform wavelength division processing on the third optical signal, and transmit the fourth optical signal with the first wavelength in the third optical signal. Among them, the wavelength division multiplexer 250 can also be understood as a filter, a filter plate, a dichroic mirror, a beam splitting prism, etc. according to the specific scenario, and is determined according to the actual situation.

[0048] The optical receiver 260 is used to receive the fourth optical signal and convert the fourth optical signal into an electrical signal. Specifically, the optical receiver 260 may include an optical receiving chip and a signal processing chip. The optical receiving chip is used to convert the fourth optical signal into an electrical signal, and the signal processing chip is used to process the data carried in the converted electrical signal.

[0049] Among them, the wavelength division multiplexer 250 can transmit the fourth optical signal along the third direction, and any two of the first direction, the second direction, and the third direction are non-parallel. That is, the ports for transmitting or receiving optical signals are respectively located in three different dimensions. Compared with an optical module with multiple ports arranged on the same two-dimensional plane, the device size is reduced and the device space is fully utilized.

[0050] In some implementation manners, the optical receiver 260 is in a dual-receiving form. That is, the optical module has two receiving optical paths and two transmitting optical paths.

[0051] In Figure 2 In the optical module shown, by adopting a polarization coupling scheme for the optical signal transmitted by the optical transmitter and a wavelength division multiplexing scheme for the optical signal received by the optical receiver, the complexity of the internal optical path is reduced.

[0052] Figure 3 It is a schematic diagram of the internal structure of a dual-receiving optical receiver provided by an embodiment of the present application. As Figure 3 shown, the optical receiver includes a first filter 310, a second filter 320, a third filter 330, a first optical receiving chip 340, and a second optical receiving chip 350.

[0053] Among them, the first filter 310 can be used to divide the fourth signal light into a fifth signal light with a second wavelength and a sixth signal light with a third wavelength after receiving the fourth signal light, transmit the fifth signal light to the first optical receiving chip 340, and transmit the sixth signal light to the second filter 320. After receiving the sixth signal light, the second filter reflects the sixth signal light to the third filter 330. The third filter 330 filters the sixth signal light to obtain a seventh signal light with a fourth wavelength in the sixth signal light, and transmits the seventh signal light to the second optical receiving chip 350. After receiving the fifth signal light, the first optical receiving chip 340 can convert the fifth signal light into a corresponding electrical signal. After receiving the seventh signal light, the second optical receiving chip 350 can convert the seventh signal light into a corresponding electrical signal.

[0054] In the case as Figure 3 shown, the first filter 310 and the first optical receiving chip 340 can be arranged at intervals along the first transmission path, and the second filter 320, the third filter 330, and the second optical receiving chip can be arranged at intervals along the second transmission path. The first transmission path can be parallel to the second transmission path.

[0055] In addition, the first optical receiving chip 340 and the second optical receiving chip 350 may not be on the same horizontal plane. For example, columns, grooves, bumps, etc. can be used to adjust the heights of the first optical receiving chip 340 and the second optical receiving chip 350. In addition, the optical receiver may include a sub-package structure for accommodating the first optical receiving chip 340 or the second optical receiving chip 350.

[0056] Figure 4 is a schematic diagram of the overall structure of an optical module provided by an embodiment of the present application. As Figure 4 shown, the optical module includes a first optical transmitter 410, a second optical transmitter 420, a polarization beam combiner 430, an interface 440, a wavelength division multiplexer 450, an optical receiver 460, and a housing 470. Among them, the first optical transmitter 410, the second optical transmitter 420, the polarization beam combiner 430, the interface 440, the wavelength division multiplexer 450, and the optical receiver 460 are Figure 1 or Figure 2 similar to those described therein, and will not be elaborated here.

[0057] The housing 470 is used to assemble components such as a first optical transmitter 410, a second optical transmitter 420, an interface 440, and an optical receiver 460. The housing 470 is a polyhedron composed of multiple planes, and the first optical transmitter 410, the second optical transmitter 420, and the interface 440 are respectively located in different planes among the multiple planes. When the optical module includes an optical receiver 460, the optical receiver 460 is also located in a different plane among the multiple planes. Thus, the different-dimensional spaces of the housing are fully utilized to improve the device integration. In some implementation manners, the housing 470 is a cube or a cuboid. In the current two-dimensional optical module solution, devices such as optical transmitters and optical receivers need to be connected to a single board using flexible printed circuit connectors, which is not conducive to the installation and integration of the optical module. However, the three-dimensional optical module solution of the present application does not require the use of connectors, facilitating the on-board installation of the optical module.

[0058] As a specific implementation manner, as Figure 4 shown in (a) of FIG., the first optical transmitter 410 is located in the YZ plane of the housing 470, and the first signal light emitted by the first optical transmitter 410 is directed towards the X axis. The second optical transmitter 420 is located in the XY plane of the housing 470, and the second signal light emitted by the second optical transmitter 420 is directed towards the Z axis. The optical receiver 460 is located in the XZ plane of the housing 470, and the third signal light received by the optical receiver is directed towards the Y axis direction. Figure 4 FIG. (b) shows the internal device mounting situation of the housing 470 structure. Among them, the polarization beam combiner 430 forms an angle of 45 degrees with the X axis, and the polarization beam combiner 430 forms an angle of 45 degrees with the Z axis. The wavelength division multiplexer 450 forms an angle of 45 degrees with the X axis, and the wavelength division multiplexer 450 forms an angle of 45 degrees with the Y axis. The specific positions of the polarization beam combiner 430 and the wavelength division multiplexer 450 are determined according to the actual situation, and the present application does not limit this.

[0059] It should be understood that in the optical device as Figures 1 to 4 shown, an optical transmitter and an optical receiver in the form of a transistor outline (TO) with coaxial packaging are used as an illustration. In addition, the optical transmitter and the optical receiver can also be in other specific forms, and the present application does not limit this. It should be understood that only the key devices in the optical module are shown in the above figures. In addition, a cooler, a heat sink, etc. can also be provided inside the optical module, which is determined according to the actual installation process of the optical module. Optical paths inside the optical module, such as the central area of the housing, or between multiple optical transmitters and optical receivers, can also be provided with collimating lenses, mirrors, isolators, etc., subject to the actual optical path.

[0060] In addition, as Figures 1 to 4The optical device shown only shows the case where the optical transmitter and the optical receiver are arranged in three planes of the optical module. In the case where the housing specifically includes more than four planes, the polarization coupling scheme provided by the present application can also be used to arrange the optical transmitter on other surfaces of the housing. In addition, the wavelength division multiplexing scheme provided by the present application can be used to arrange the optical receiver on other surfaces of the housing. In addition, any one of the above optical transmitters can specifically be in a single-issue form or a multi-issue form, and any one of the above optical receivers can specifically be in a single-receive form or a multi-receive form, which is determined according to the actual optical module design.

[0061] In addition, an embodiment of the present application also provides an optical communication device. As Figure 5 shown, the optical communication device includes N single boards, such as Figure 5 the single board 1, single board 2,..., single board N shown in (a) in the figure. Each of the N single boards includes one or more optical modules described in the above figures. For example, as Figure 5 shown in (b) in the figure, the single board 1 specifically includes optical module 1, optical module 2,..., optical module M. Each optical module includes the optical modules described in the above figures. Among them, the specific form of the optical communication device can be an optical transmission device, an optical access device, an optical switching device, a fiber optic modem, etc., which is determined according to the actual situation. When applied to a passive optical network, the optical communication device can be an optical line terminal, an optical distribution network, an optical network unit, and an optical network terminal, etc.

[0062] In some implementation manners, the above optical module is arranged in an optical network unit in an FTTR networking structure, and the optical network unit can also be understood as the main optical modem or the main router in the networking structure. In the FTTR networking structure, if wavelength multiplexing of, for example, GPON and 10GPON is performed at the optical line terminal, additional supporting devices such as an OLT chassis and a rack need to be added, which occupies a large amount of computer room space and is not conducive to management and maintenance. By adopting the Combo PON scheme of integrating optical modules in the optical network unit and multiplexing signal lights of multiple rates and wavelengths in one optical module, the original equipment chassis can be reused, the network upgrade is simple, the maintenance is easy, and a smooth upgrade to a higher-rate optical network can be achieved.

[0063] Figure 6 It is a schematic diagram of a networking structure of an optical network provided by an embodiment of the present application. The optical module and the optical communication device provided by the embodiment of the present application can be applied to Combo PON.

[0064] As a networking structure, the electrical chip 610 is used to generate a first electrical signal based on data, and the rate of the first electrical signal can be 10G or 2.5G. The optical chip in the first optical transmitter 620 is used to convert the first electrical signal into a first signal light, and the wavelength of the first signal light is 1270±10nm. The electrical chip 610 is also used to generate a second electrical signal based on data, and the rate of the second electrical signal can be 1.25G. The optical chip in the second optical transmitter 630 is used to convert the second electrical signal into a second signal light, and the wavelength of the second signal light is 1310±20nm. The polarization beam combiner 650 is used to combine the first signal light and the second signal light into a mixed light and send the mixed light to the interface 670. The interface 670 is also used to send the third signal light transmitted in the optical fiber to the wavelength division multiplexer 660, and the wavelength division multiplexer 660 separates the fourth signal light of the third signal light from other signal lights. The wavelength of the fourth signal light is 1490nm and 1577nm. The fourth signal light is received by the optical receiver 640. The first optical receiving chip in the optical receiver 640 is used to process the fifth signal light with a wavelength of 1490nm and convert the fifth signal light into a third electrical signal. The second optical receiving chip in the optical receiver 640 is used to process the seventh signal light with a wavelength of 1577nm and convert the seventh signal light into a fourth electrical signal. The electrical chip 610 is also used to convert the third electrical signal and the fourth electrical signal into corresponding data.

[0065] As another networking structure, the electrical chip 610 is used to generate a first electrical signal based on data, and the rate of the first electrical signal can be 50G or 25G. The optical chip in the first optical transmitter 620 is used to convert the first electrical signal into a first signal light, and the wavelength of the first signal light is 1284~1288nm. The electrical chip 610 is also used to generate a second electrical signal based on data, and the rate of the second electrical signal can be 10G. The optical chip in the second optical transmitter 630 is used to convert the second electrical signal into a second signal light, and the wavelength of the second signal light is 1260~1280nm. The polarization beam combiner 650 is used to combine the first signal light and the second signal light into a mixed light and send the mixed light to the interface 670. The interface 670 is also used to send the third signal light transmitted in the optical fiber to the wavelength division multiplexer 660, and the wavelength division multiplexer 660 separates the fourth signal light of the third signal light from other signal lights. The wavelength of the fourth signal light is 1340~1344nm and 1575~1580nm. The fourth signal light is received by the optical receiver 640. The first optical receiving chip in the optical receiver 640 is used to process the fifth signal light with a wavelength of 1340~1344nm and convert the fifth signal light into a third electrical signal with a rate of 50G. The second optical receiving chip in the optical receiver 640 is used to process the seventh signal light with a wavelength of 1575~1580nm and convert the seventh signal light into a fourth electrical signal with a rate of 25G. The electrical chip 610 is also used to convert the third electrical signal and the fourth electrical signal into corresponding data.

[0066] In addition, the optical module and the optical communication device provided in the embodiments of the present application can also be applied to other passive optical networks. For example, next-generation PON (NG-PON), NG-PON1, NG-PON2, 10-gigabit-per-second PON (XG-PON), 10-gigabit-capable symmetric passive optical network (XGS-PON), Ethernet PON (EPON), 10-gigabit-per-second EPON (10G-EPON), next-generation EPON (NG-EPON), wavelength-division multiplexing (WDM) PON, time-and wavelength-division multiplexing (TWDM) PON, point-to-point (P2P) WDM PON (P2P-WDM PON), asynchronous transfer mode PON (APON), broadband PON (BPON), and so on, as well as 25-gigabit-per-second PON (25G-PON), 50-gigabit-per-second PON (50G-PON), 100-gigabit-per-second PON (100G-PON), 25-gigabit-per-second EPON (25G-EPON), 50-gigabit-per-second EPON (50G-EPON), 100-gigabit-per-second EPON (100G-EPON), and GPON, EPON, etc. at other rates.

[0067] As described above, the above are only the specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An optical module, characterized in that, Comprising a first optical transmitter, a second optical transmitter, a polarization beam combiner and an interface, wherein: The first optical transmitter is configured to emit a first signal light propagating in a first direction, and the polarization state of the first signal light is a first polarization state; The second optical transmitter is configured to emit a second signal light propagating in a second direction, and the polarization state of the second signal light is a second polarization state, and the first direction and the second direction are non-parallel; The polarization beam combiner is configured to receive the first signal light and the second signal light, combine the first signal light and the second signal light into a mixed light, and emit the mixed light to the interface; The interface is configured to connect to an optical transmission medium.

2. The optical module according to claim 1, wherein The wavelengths and / or rates of the first signal light and the second signal light are different.

3. The optical module according to claim 1 or 2, characterized in that The wavelength interval between the first signal light and the second signal light is less than 40 nm.

4. The optical module according to any one of claims 1 to 3, characterized in that Wherein: The polarization beam combiner includes a first light incident surface, a second light incident surface and a light output surface. The first light incident surface is configured to receive the first signal light, the second light incident surface is configured to receive the second signal light, and the light output surface is configured to emit the mixed light; The first light incident surface and the light output surface are arranged parallel or coincident, or the second light incident surface and the light output surface are arranged parallel or coincident.

5. The optical module according to claim 4, characterized in that, The polarization beam combiner is a polarizing plate, and the polarizing plate is configured to transmit the first signal light, and further, the polarizing plate is configured to reflect the second signal light.

6. The optical module according to any one of claims 1 to 5, characterized in that Further comprising an optical receiver and a wavelength division multiplexer, wherein: The optical transmission medium is configured to transmit a third signal light, and the interface is configured to emit the third signal light; The wavelength division multiplexer is configured to receive the third signal light, perform wavelength division processing on the third signal light, and emit a fourth signal light with a first wavelength in the third signal light; The optical receiver is configured to receive the fourth signal light and convert the fourth signal light into an electrical signal.

7. The optical module according to claim 6, wherein The wavelength division multiplexer emits the fourth signal light in a third direction, and any two of the first direction, the second direction and the third direction are non-parallel.

8. The optical module according to claim 6 or 7, characterized in that, The optical receiver is in a dual-receiving form.

9. The optical module according to any one of claims 6 to 8, characterized in that Further comprising a housing, the housing being a polyhedron composed of a plurality of planes, and the first optical transmitter, the second optical transmitter and the optical receiver are respectively located in different planes of the plurality of planes.

10. The optical module according to claim 9, wherein, The housing is a cube or a cuboid.

11. An optical communication device, characterized in that, Comprising N single boards, and the single board among the N single boards includes at least one optical module as described in any one of claims 1 to 10.

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