Optical assembly, optical module, and related device

Abstract

An optical assembly, an optical module, and a related device. A light splitting unit in the optical assembly receives input signal light obtained after signal optical multiplexing of a number N of passive optical networks in a first direction, and performs optical demultiplexing on the input signal, to obtain first signal light containing a number M of wavelengths, and second signal light containing N-M wavelengths, the first signal light and the second signal light being transmitted to a receiving module, N being an integer greater than 1, M being an integer greater than or equal to 1, and M being less than or equal to N-1. The function of outputting multiple light beams having different wavelengths at corresponding ports can be achieved without requiring an external device, and the included angle between the first direction and a normal line of a first light splitting unit is less than or equal to 45 degrees. Thus, the light splitting unit of the optical assembly implements light splitting based on a small angle, and establishes an extremely narrow light splitting path. The light splitting unit can be directly applied to an optical module of an optical line terminal, further realizing miniaturization of the optical line terminal.

Description

Optical component, optical module and related equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on August 15, 2023, with application number 202311033123.0 and invention name “An optical component, optical module and related equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of optical communication technology, and specifically to an optical component, an optical module, and related equipment. Background Art

[0003] Early gigabit-capable passive optical networks (GPON) provided 100-Mbps broadband access services. However, as users demanded higher bandwidth access speeds, operators upgraded their networks to 10-gigabit-capable passive optical networks (10G PON / XGPON), 10-gigabit-capable symmetric passive optical networks (XGSPON), and even 50-gigabit-capable passive optical networks (50G PON).

[0004] Currently, users are not in urgent need of bandwidth upgrades, and GPON will still be in the network for a long time. However, the high-bandwidth XGSPON is used in commercial scenarios and may be upgraded to 50G PON in the future. In this case, multiple generations of passive optical networks (PON), including GPON, XG(S)PON, and 50G PON, will coexist. To adapt to this situation, external wavelength division multiplexers (WDMs) are currently used on optical line terminals (OLTs) to distribute the different wavelengths of signal light from multiple generations of networks.

[0005] However, the external wavelength division multiplexer not only increases the insertion loss of the optical link, but also increases the complexity of operation and maintenance, especially increasing the size of the OLT.

[0006] Summary of the Invention

[0007] The present invention provides an optical component for miniaturizing an optical line terminal, and also provides a corresponding optical module, an optical line terminal, and an optical network unit.

[0008] In a first aspect, the present application provides an optical component, which includes a splitter module and a receiving module, the splitter module including a first splitter unit; the first splitter unit is used to receive input signal light from a first direction, the input signal light is signal light obtained after multiplexing signal lights of N passive optical networks, and the angle between the first direction and the normal of the first splitter unit is less than or equal to 45 degrees; the first splitter unit is also used to demultiplex the input signal light to obtain a first signal light and a second signal light, and transmit the first signal light and the second signal light to the receiving module, the first signal light includes M wavelengths, the second signal light includes NM wavelengths, the M wavelengths correspond to M types of passive optical networks in the N types of passive optical networks, and the NM wavelengths correspond to NM types of passive optical networks in the N types of passive optical networks; wherein N is an integer greater than 1, M is an integer greater than or equal to 1, and M is less than or equal to N-1.

[0009] The optical component in this application can be applied to an optical module in an optical line terminal.

[0010] The input signal light in this application is the uplink signal light, that is, the signal light sent from the optical network unit on the client side to the optical line terminal on the device side.

[0011] In this application, each of the N passive optical networks corresponds to a wavelength range. The first signal light includes M wavelengths, and the M wavelengths correspond to M wavelength ranges. That is, the M wavelengths belong to M wavelength ranges, and the M wavelength ranges correspond to M passive optical networks. The first signal light can be understood as the signal light obtained by multiplexing the signal lights of the M passive optical networks.

[0012] Similarly, the second signal light includes NM wavelengths, and the NM wavelengths correspond to NM wavelength ranges, that is, the NM wavelengths belong to NM wavelength ranges respectively, and the NM wavelength ranges correspond to NM passive optical networks. The second signal light can be understood as the signal light obtained by multiplexing the signal lights of the NM passive optical networks.

[0013] In the first aspect, the angle between the first direction and the normal of the first spectrometer is less than or equal to 45 degrees. For the first direction, that is, the direction in which the input signal light enters the first spectrometer, the angle between the first direction and the normal of the first spectrometer needs to be considered to separate the first signal light and the second signal light and to meet the miniaturization of the entire optical component.

[0014] When the angle between the first direction and the normal of the first optical splitting unit is less than or equal to 45 degrees, the first optical splitting component can not only separate the first signal light and the second signal light by transmission and reflection, but also make the angle between the first signal light and the second signal light greater than or equal to 90 degrees. In this way, the receiving module for receiving the first signal light and the receiving module for receiving the second signal light can be arranged in the same plane as much as possible, thereby realizing the miniaturization of the optical component. The optical splitting unit of the optical component realizes light splitting based on a small angle, establishing an extremely narrow light splitting optical path. When the optical component is used in the optical module of the optical line terminal, not only is the optical component itself miniaturized, but for the optical line terminal, it also has the function of outputting multiple light beams of different wavelengths at corresponding ports without the need for external devices, further realizing the miniaturization of the optical line terminal.

[0015] In a possible implementation manner of the first aspect, an angle between the first direction and a normal line of the first light splitting unit is less than or equal to 13.5 degrees.

[0016] In this possible implementation, when the angle between the first direction and the normal of the first light splitting unit is less than or equal to 13.5 degrees, the input signal light can be split, which is beneficial to the miniaturization of the optical component and improves the feasibility of the solution.

[0017] In a possible implementation of the first aspect, the optical component further includes a transmitting module, and the light splitting module further includes a second light splitting unit;

[0018] The transmitting module is used to multiplex the signal lights of N passive optical networks to obtain output signal light, and transmit the output signal light to the second splitting unit, which is used to transmit the output signal light.

[0019] In this possible implementation, the optical component is a single-fiber bidirectional optical component, in which the output signal light emitted by the transmitting module is a downlink signal light, that is, the signal light sent by the optical line terminal on the device side to the optical network unit on the customer side, realizing the bidirectional multiplexing and demultiplexing function.

[0020] In a possible implementation manner of the first aspect, the second optical splitting unit is further configured to receive input signal light from the second direction and reflect the input signal light in the first direction to the first optical splitting unit.

[0021] In this possible implementation, by multiplexing the second optical splitting unit, the second optical splitting unit separates the wavelengths of the transmitting and receiving ends, thereby achieving coupling between the transmitting module and the receiving module, which is beneficial to the miniaturization of the optical component.

[0022] In a possible implementation manner of the first aspect, an angle between the second direction and a normal to the second light splitting unit is less than or equal to 45 degrees.

[0023] In this possible implementation, wavelength separation at the transmitting and receiving ends can be achieved when the angle between the second direction and the normal of the second optical splitting unit is less than or equal to 45 degrees, thereby improving the feasibility of the solution.

[0024] In a possible implementation manner of the first aspect, an angle between the second direction and a normal to the second light splitting unit is less than or equal to 13.5 degrees.

[0025] In this possible implementation, when the angle between the second direction and the normal of the second light splitting unit is less than or equal to 13.5 degrees, not only can wavelength separation at the transmitting and receiving ends be achieved, but it is also conducive to miniaturization of optical components.

[0026] In a possible implementation of the first aspect, the optical splitting module further includes a third optical splitting unit; the first optical splitting unit is configured to transmit the first signal light to the third optical splitting unit; and the third optical splitting unit is configured to reflect the first signal light to the receiving module.

[0027] In this possible implementation, by providing an additional third light splitting unit, the direction of the first signal light can be changed, thereby correspondingly changing the position of the receiving module, which is conducive to miniaturization of the optical component.

[0028] In a possible implementation of the first aspect, the optical splitting module further includes a fourth optical splitting unit; the first optical splitting unit is used to reflect the second signal light to the fourth optical splitting unit; and the fourth optical splitting unit is used to reflect the second signal light to the receiving module.

[0029] In this possible implementation, by providing an additional fourth light splitting unit, the direction of the second signal light can be changed, thereby correspondingly changing the position of the receiving module, which is conducive to miniaturization of the optical component.

[0030] In a possible implementation of the first aspect, the optical splitting module further includes a fifth optical splitting unit and a sixth optical splitting unit, and M is greater than 1;

[0031] The third optical splitter unit is specifically used to reflect the first signal light to the fifth optical splitter unit; the fifth optical splitter unit is used to demultiplex the first signal light to obtain the third signal light and the fourth signal light, and transmit the third signal light to the receiving module, and reflect the fourth signal light to the sixth optical splitter unit; the sixth optical splitter unit is used to reflect the fourth signal light to the receiving module.

[0032] In this possible implementation, by providing an additional fifth splitting unit and a sixth splitting unit, the first signal light can be further demultiplexed and sent to different receiving modules for reception, thereby improving the adaptability of the receiving modules and the feasibility of the solution.

[0033] In a possible implementation of the first aspect, the optical splitting module further includes a seventh optical splitting unit and an eighth optical splitting unit, NM is greater than 1; the fourth optical splitting unit is specifically used to reflect the second signal light to the seventh optical splitting unit; the seventh optical splitting unit is used to demultiplex the second signal light to obtain a fifth signal light and a sixth signal light, and transmit the fifth signal light to the receiving module, and reflect the sixth signal light to the eighth optical splitting unit; the eighth optical splitting unit is used to reflect the sixth signal light to the receiving module.

[0034] In this possible implementation, by providing an additional seventh and eighth optical splitting units, the second signal light can be further demultiplexed and sent to different receiving modules for reception, thereby improving the adaptability of the receiving modules and the feasibility of the solution.

[0035] In a possible implementation of the first aspect, the optical splitting module further includes a ninth optical splitting unit, the third optical splitting unit is specifically configured to reflect the first signal light to the ninth optical splitting unit, and the ninth optical splitting unit is configured to reflect the first signal light to the receiving module.

[0036] In this possible implementation, by providing an additional ninth light splitting unit, the direction of the first signal light can be further changed, thereby correspondingly changing the position of the receiving module, which is conducive to miniaturization of the optical component.

[0037] In a possible implementation of the first aspect, the optical splitting module further includes a tenth optical splitting unit, the fourth optical splitting unit is specifically configured to reflect the second signal light to the tenth optical splitting unit, and the tenth optical splitting unit is configured to reflect the second signal light to the receiving module.

[0038] In this possible implementation, by providing an additional tenth optical unit, the direction of the second signal light can be further changed, thereby correspondingly changing the position of the receiving module, which is conducive to miniaturization of the optical component.

[0039] In a possible implementation manner of the first aspect, the receiving module includes a receiving port, the number of the receiving ports is 1 to N, and the receiving port is used to receive signal light of at least one passive optical network.

[0040] In this possible implementation, the receiving port can simultaneously receive signal lights from a variety of different passive optical networks, thereby improving the adaptability of the receiving port and increasing the adaptability of signal lights from different passive optical networks.

[0041] In a possible implementation manner of the first aspect, the receiving port includes a filtering unit, and the filtering unit is configured to pass signal light of a passive optical network matching the receiving port.

[0042] In this possible implementation, since the optical splitting unit has limited isolation for signal light of different wavelength ranges, a filtering unit is also provided at the receiving port to filter out signal light of wavelengths that do not match the receiving port, thereby improving the receiving stability of the optical component.

[0043] In a possible implementation manner of the first aspect, the receiving port is any one of a coaxial package TO, a butterfly package, or a chip-on-board package COB.

[0044] In this possible implementation, the receiving port can adopt multiple encapsulation forms, which improves the feasibility of the solution.

[0045] In a possible implementation of the first aspect, the transmission module includes N optical transmitters and N-1 to N+1 transmission splitting units, and the N-1 to N+1 transmission splitting units are used to multiplex the signal lights emitted by the N optical transmitters to obtain output signal lights.

[0046] In this possible implementation, N optical transmitters of the transmitting module are combined and integrated, further realizing the miniaturization of the optical component.

[0047] In a possible implementation of the first aspect, the optical assembly further includes an isolation plate, the isolation plate being used to separate the transmitting module from the receiving module, and an optical window being provided on the isolation plate, the optical window being used to transmit the output signal light.

[0048] In this possible implementation, the transmitting module and the receiving module in the optical component can be coupled, thereby further miniaturizing the optical component without affecting the optical performance.

[0049] In a possible implementation manner of the first aspect, the first light splitting unit is any one of a filter, a light splitting prism, or a wave splitter.

[0050] In this possible implementation, there are multiple options for the optical splitting unit, which improves the feasibility of the solution.

[0051] In a possible implementation of the first aspect, the N types of passive optical networks include any N of a gigabit passive optical network (GPON), a 10 gigabit passive optical network (10G PON / XGPON), a 10 gigabit symmetric passive optical network (XGSPON), a 50 gigabit passive optical network (50G PON), an Ethernet passive optical network (EPON), a 10 gigabit Ethernet passive optical network (10G EPON), and a 50 gigabit Ethernet passive optical network (50G EPON).

[0052] In this possible implementation, the optical component supports multiple generations of passive optical networks, improving the feasibility of the solution.

[0053] A second aspect of the present application provides an optical module, which includes an optical component according to the first aspect or any possible implementation of the first aspect.

[0054] A third aspect of the present application provides an optical line terminal, which includes an optical module according to the second aspect or any possible implementation of the second aspect.

[0055] A fourth aspect of the present application provides an optical network unit, which includes an optical module according to the second aspect or any possible implementation of the second aspect.

[0056] In an embodiment of the present application, a splitter unit in an optical component receives an input signal light obtained after multiplexing signal lights of N passive optical networks from a first direction, and demultiplexes the input signal light to obtain a first signal light comprising M wavelengths and a second signal light comprising NM wavelengths, and transmits the first signal light and the second signal light to a receiving module, wherein N is an integer greater than 1, M is an integer greater than or equal to 1, and M is less than or equal to N-1, and has the function of outputting a plurality of light beams of different wavelengths at corresponding ports without the need for external devices, and the angle between the first direction and the normal of the first splitter unit is less than or equal to 45 degrees, so that the splitter unit of the optical component realizes splitting based on a small angle, establishes an extremely narrow splitting optical path, and can be directly applied to the optical module of the optical line terminal, further realizing the miniaturization of the optical line terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] FIG1 is a schematic diagram of the architecture of a passive optical network;

[0058] FIG2 is a schematic diagram of the structure of an optical line terminal provided in an embodiment of the present application;

[0059] FIG3 is a schematic diagram of an embodiment of an optical assembly provided in an embodiment of the present application;

[0060] 4A and 4B are schematic diagrams of an embodiment of an optical assembly provided in an embodiment of the present application;

[0061] 5A-5C are schematic diagrams of embodiments of a transmitting module provided in an embodiment of the present application;

[0062] 6 to 11 are schematic diagrams of embodiments of optical components provided in embodiments of the present application;

[0063] FIG12 is a schematic diagram of an embodiment of a passive optical network provided in an embodiment of the present application. DETAILED DESCRIPTION

[0064] The following describes the embodiments of the present application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present application, rather than all the embodiments. Those skilled in the art will appreciate that with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0065] The terms "first," "second," and the like in the specification and claims of this application and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions, e.g., a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or apparatus.

[0066] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0067] In addition, numerous specific details are provided in the detailed description below to better illustrate the present application. Those skilled in the art will appreciate that the present application can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0068] The following examples illustrate the application scenarios involved in the embodiments of the present application.

[0069] A passive optical network (PON) is a point-to-multipoint passive optical network. It's a combination of network components within an optical access network based on an optical distribution network (ODN), without any electronic components or power supplies. The ODN consists entirely of passive components, such as optical splitters. A PON consists of an optical line terminal (OLT) installed at a central control station and multiple optical network units (ONUs) installed at user locations. It implements a specific set of physical media layers, transmission convergence layers, and management protocols.

[0070] As shown in Figure 1, the optical line terminal (OLT) is connected to two optical network units (ONUs) via an optical distribution network (ODN). The ODN refers to the entire passive optical network between the OLT port and each ONU port. It should be understood that in other networking scenarios, a single OLT can connect to a larger number of ONUs. The OLT and the ODN must be interconnected via optical modules. These modules convert the electrical signals sent by the OLT into optical signals, which are then transmitted to the ONUs via the ODN. Furthermore, the optical modules convert the optical signals transmitted by the ONUs via the ODN into electrical signals, which are then transmitted to the OLT.

[0071] Early gigabit-capable passive optical networks (GPON) provided 100-Mbps broadband access services. However, as users demanded higher bandwidth access speeds, operators upgraded their networks to 10-gigabit-capable passive optical networks (10G PON / XGPON), 10-gigabit-capable symmetric passive optical networks (XGSPON), and even 50-gigabit-capable passive optical networks (50G PON).

[0072] Currently, users are not in urgent need of bandwidth upgrades, and GPON will still be in the network for a long time. However, the high-bandwidth XGSPON is used in commercial scenarios and may be upgraded to 50G PON in the future. In this case, multiple generations of passive optical networks (PON), including GPON, XG(S)PON, and 50G PON, will coexist. Because the upstream and downstream wavelengths of GPON, 10G PON, and 50G PON differ, an external wavelength division multiplexer (WDM) is required to adapt to this situation. For example, an external WDM coexistence WDM on the OLT can be used to combine or split the upstream and downstream signals, achieving compatibility and distribution of the different wavelengths of multiple PON generations.

[0073] However, an external wavelength division multiplexer not only increases insertion loss in the optical link but also complicates operation and maintenance, particularly increasing the size of the OLT. To address this issue, embodiments of the present application provide an optical component for miniaturizing an optical line terminal (OLT). Embodiments of the present application also provide a corresponding optical module and OLT.

[0074] As shown in Figure 2, the optical component provided in the embodiment of the present application can be directly set inside the optical module, and there is no need for an external wavelength division multiplexer to increase the volume of the OLT. While the optical module realizes photoelectric conversion, it can also realize the wavelength division function of multiple generations of PON. The optical component establishes an extremely narrow splitting optical path, further ensuring the miniaturization of the optical line terminal.

[0075] It should be understood that the dotted lines in the drawings of the embodiments of the present application represent signal light, and the dotted lines represent normal lines.

[0076] The optical components provided in the embodiments of the present application are described below in conjunction with the above application scenarios.

[0077] As shown in FIG3 , an embodiment of the present application provides an optical component, which includes a light splitting module 100 and a receiving module.

[0078] Specifically, the optical splitting module 100 includes a first optical splitting unit 101, which is used to receive input signal light from a first direction, demultiplex the input signal light, obtain a first signal light and a second signal light, and finally transmit the first signal light and the second signal light to a receiving module. For example, the first optical splitting unit 101 transmits the first signal light to one receiving module and reflects the second signal light to another receiving module.

[0079] The input signal light is a signal light obtained by multiplexing the signal lights of N passive optical networks, where the N passive optical networks include any N of GPON, 10G PON / XGPON, XGSPON, 50G PON, Ethernet passive optical network (EPON), 10G EPON and 50G EPON.

[0080] For example, N is 3, and the three passive optical networks are GPON, 10G PON and 50G PON. Each passive optical network corresponds to a wavelength range (it should be understood that the wavelength ranges of different passive optical networks may overlap). Each wavelength range can be represented by the center wavelength of its wavelength range. Since the input signal light is the uplink signal light (that is, the signal light sent from the ONU on the client side to the OLT on the device side), the uplink center wavelength of GPON is 1310nm, the uplink center wavelength of 10G PON is 1270nm, and the uplink center wavelength of 50G PON is 1286nm. The specific wavelength range is extended with the center wavelength as the center. For example, the wavelength range of GPON is 1290nm to 1330nm, the wavelength range of 10G PON is 1260nm to 1280nm, and the wavelength range of 50G PON is 1284nm to 1288nm. The embodiments of this application will be described later with GPON, 10G PON and 50G PON is used as an example, and different wavelength ranges or center wavelengths are used to represent different passive optical networks.

[0081] It should be understood that with the upgrade of passive optical networks, the optical components provided in the embodiments of the present application are also applicable to the wavelength range of subsequent upgraded next-generation PON or EPON passive optical networks, and the embodiments of the present application do not limit this.

[0082] After demultiplexing the input optical signal, the first optical splitting unit 101 obtains a first optical signal and a second optical signal, wherein the first optical signal includes M wavelengths, and the second optical signal includes NM wavelengths, the M wavelengths corresponding to M types of passive optical networks among the N types of passive optical networks, and the NM wavelengths corresponding to NM types of passive optical networks among the N types of passive optical networks. Wherein N is an integer greater than 1, M is an integer greater than or equal to 1, and M is less than or equal to N-1.

[0083] Exemplarily, the first signal light includes two wavelengths, namely 1300nm and 1275nm, and 1300nm belongs to the wavelength range of GPON, and 1275nm belongs to the wavelength range of 10G PON. The two wavelengths of the first signal light correspond to two passive optical networks, respectively. The first signal light includes the wavelengths of two passive optical networks, GPON and 10G PON.

[0084] Furthermore, the receiving module includes a receiving port 200, the number of which is 1 to N. The receiving port 200 is used to receive signal light of at least one passive optical network, that is, the receiving port 200 can receive signal light of 1 to N wavelength ranges. The receiving port 200 can specifically be a coaxial package (transistor outline, TO), a butterfly package (BOX package) or a chip on board package (chips on board, COB). Taking the receiving port 200 as an example of a TO, the TO can be a single-receiving TO for receiving signal light of one wavelength range, a dual-receiving TO for receiving signal light of two wavelength ranges, or a triple-receiving TO for receiving signal light of three wavelength ranges, etc.

[0085] Exemplarily, when N is 2, M is 1, the input signal light is the signal light obtained by multiplexing GPON and 10G PON, the wavelength of the first signal light is 1310nm (GPON), and the wavelength of the second signal light is 1270nm (10G PON). The receiving module includes two receiving ports, namely a first receiving port and a second receiving port. The first receiving port is used to receive the first signal light of GPON, and the second receiving port is used to receive the second signal light of 10G PON.

[0086] Alternatively, the wavelength of the first signal light is 1270 nm (10G PON), the wavelength of the second signal light is 1310 nm (GPON), the first receiving port is used to receive the first signal light of 10G PON, and the second receiving port is used to receive the second signal light of GPON.

[0087] When N is 3 and M is 1, the input signal light is the signal light obtained by multiplexing GPON, 10G PON and 50G PON. The wavelength of the first signal light is 1310nm (GPON), and the second signal light is a signal light containing two wavelengths, which are 1270nm (10G PON) and 1286nm (50G PON). The receiving module includes two receiving ports, namely a first receiving port and a second receiving port. The first receiving port is used to receive the first signal light of GPON, and the second receiving port is used to receive the second signal light of 10G PON and 50G PON. The second receiving port is a dual-receiving TO.

[0088] When N is 3 and M is 2, the input signal light is the signal light obtained by multiplexing GPON, 10G PON and 50G PON. The first signal light includes two wavelengths of signal light, which are 1310nm (GPON) and 1270nm (10G PON), and the wavelength of the second signal light is 1286nm (50G PON). The receiving module includes two receiving ports, namely a first receiving port and a second receiving port. The first receiving port is used to receive the first signal light of GPON and 10G PON, and the second receiving port is used to receive the second signal light of 50G PON. The first receiving port is a dual-receiving TO.

[0089] Optionally, the receiving port 200 includes a filtering unit for passing signal light from a passive optical network (PON) compatible with the receiving port 200. Because the input signal light passes through only one first optical splitter 101, which has limited isolation (approximately 15 dB) for 1286nm wavelength signal light, a small amount of 1286nm wavelength signal light is incident on the dual-receiving TO (receiving port 200 for both 10G PON and GPON). Therefore, two 0-degree filters are placed in each of the dual-receiving TOs, one low-pass, one high-impedance (e.g., on the 10G PON receiving side: passing wavelengths less than 1280nm, but blocking wavelengths greater than 1284nm) and the other high-pass, one low-impedance (e.g., on the GPON receiving side: passing wavelengths greater than 1290nm, but blocking wavelengths less than 1288nm).

[0090] In the embodiment of the present application, the angle between the first direction and the normal of the first splitting unit 101 is less than or equal to 45 degrees. For the first direction, that is, the direction in which the input signal light enters the first splitting unit 101, the angle between the first direction and the normal of the first splitting unit 101 needs to be considered to separate the first signal light and the second signal light and to meet the miniaturization of the entire optical component. When the angle between the first direction and the normal of the first optical splitting unit 101 is less than or equal to 45 degrees, the first optical splitting component can not only separate the first signal light and the second signal light by transmission and reflection, but also make the angle between the first signal light and the second signal light greater than or equal to 90 degrees. In this way, the receiving module for receiving the first signal light and the receiving module for receiving the second signal light can be arranged in the same plane as much as possible, thereby realizing the miniaturization of the optical component. The optical splitting unit of the optical component realizes optical splitting based on a small angle, establishing an extremely narrow optical splitting path. When the optical component is used in the optical module of the optical line terminal, not only is the optical component itself miniaturized, but for the optical line terminal, it also has the function of outputting multiple light beams of different wavelengths at corresponding ports without the need for external devices, further realizing the miniaturization of the optical line terminal.

[0091] Optionally, the angle between the first direction and the normal of the first splitting unit 101 is less than or equal to 13.5 degrees. At this time, the first splitting unit 101 can transmit the first signal light of 50G PON with a wavelength of 1286nm, and reflect the second signal light of 10G PON with a wavelength of 1270nm and GPON with a wavelength of 1310nm. The angle between the first direction and the normal of the first splitting unit 101 can be specifically 13.5 degrees, 13 degrees or 8 degrees, and the angle is adjusted and controlled by active coupling.

[0092] In the embodiment of the present application, the optical splitting module 100 may further include more optical splitting units, which are described in detail below:

[0093] 1. Second Spectral Unit

[0094] As shown in FIG. 4A , the optical component further includes a transmitting module 300 , and the optical splitting module 100 further includes a second optical splitting unit 102 .

[0095] Among them, the transmitting module 300 is used to multiplex the signal lights of N types of passive optical networks to obtain output signal light, and transmit the output signal light to the second splitting unit 102. The second splitting unit 102 is used to transmit the output signal light. The second splitting unit 102 is also used to receive input signal light from the second direction and reflect the input signal light in the first direction to the first splitting unit 101.

[0096] The optical component is a single-fiber bidirectional optical component. The output signal light emitted by the transmitting module 300 is the downlink signal light (i.e., the signal light sent by the OLT on the device side to the ONU on the client side). The corresponding center wavelength of GPON is 1490nm, the center wavelength of 10G PON is 1577nm, and the center wavelength of 50G PON is 1342nm. At this time, the second splitting unit 102 is used to separate the wavelengths of the transmitting and receiving ends.

[0097] The shortest interval difference between the upstream signal light and the downstream signal light is 10nm (i.e., the difference between the wavelength range endpoint 1330nm of the upstream signal light of GPON and the wavelength range endpoint 1340nm of the downstream signal light of 50G PON). In order to separate the upstream signal light and the downstream signal light, the angle between the second direction and the normal of the second splitting unit 102 is less than or equal to 45 degrees. At the same time, in order to ensure the miniaturization of the optical component, the angle between the second direction and the normal of the second splitting unit 102 can be further limited to less than or equal to 13.5 degrees. The angle between the second direction and the normal of the second splitting unit 102 can also be specifically 13.5 degrees, 13 degrees or 8 degrees, and the angle is adjusted and controlled by active coupling.

[0098] The transmitting module 300 includes N optical transmitters 301 and N-1 to N+1 transmitting optical splitting units 302. The N-1 to N+1 transmitting optical splitting units 302 are used to multiplex the signal lights emitted by the N optical transmitters 301 to obtain output signal lights. Specifically, the optical transmitter 301 can be a laser.

[0099] Optionally, a collimating lens 303 may be provided in front of each of the N optical transmitters 301 , and a collimating lens 303 may also be provided in front of an output port for outputting signal light.

[0100] Optionally, as shown in Figure 4B, the transmitting module 300 and the receiving module are integrally formed or coupled. In this case, the optical component also includes an isolation plate 305, which is used to separate the transmitting module 300 from the receiving module. An optical window 306 is provided on the isolation plate 305, which is used to transmit the output signal light while ensuring the airtightness of the transmitting module 300.

[0101] Optionally, an isolator 304 is also provided in the receiving module. After the output signal light is output from the optical window, it passes through the isolator 304 to prevent the output signal light from being refracted back to the optical transmitter 301. Then the output signal light passes through the second splitting unit 102 and the collimating lens 303 and is output.

[0102] Optionally, the transmitting module 300 can have various forms. For example, as shown in Figures 5A-5C, N is 3, and the signal lights emitted by the two optical transmitters 301 are first combined into one, and then combined with the signal light emitted by another optical transmitter 301 and output together.

[0103] The number of emission spectrometer units 302 can range from N-1 to N+1. As shown in FIG5A , there are N-1 emission spectrometer units 302, as shown in FIG5B , there are N emission spectrometer units 302, and as shown in FIG5C , there are N+1 emission spectrometer units 302. It should be understood that the number of emission spectrometer units 302 can also be adjusted according to actual needs, and the embodiment of the present application does not limit the number of emission spectrometer units.

[0104] Second, the third splitting unit

[0105] As shown in FIG. 6 , the optical splitting module 100 further includes a third optical splitting unit 103 .

[0106] The first optical splitting unit 101 is used to transmit the first signal light to the third optical splitting unit 103 , and the third optical splitting unit 103 is used to reflect the first signal light to the receiving module.

[0107] In this case, by providing an additional third light splitting unit 103 , the direction of the first signal light can be changed, thereby correspondingly changing the position of the receiving module, which is conducive to miniaturization of the optical component.

[0108] 3. The fourth spectroscopic unit

[0109] Based on the second case, as shown in FIG7 , the optical splitting module 100 further includes a fourth optical splitting unit 104 .

[0110] The first optical splitting unit 101 is used to reflect the second signal light to the fourth optical splitting unit 104 , and the fourth optical splitting unit 104 is used to reflect the second signal light to the receiving module.

[0111] In this case, by providing an additional fourth light splitting unit 104 , the direction of the second signal light can be changed, thereby correspondingly changing the position of the receiving module, which is conducive to miniaturization of the optical component.

[0112] It should be understood that the fourth light splitting unit 104 can be provided separately, and is not limited to being superimposed on the second light splitting unit 102 or the third light splitting unit 103 .

[0113] 4. The fifth and sixth spectroscopic units

[0114] Based on the third case, as shown in FIG8 , the optical splitting module 100 further includes a fifth optical splitting unit 105 and a sixth optical splitting unit 106 , and M is greater than 1.

[0115] Among them, the third splitting unit 103 is specifically used to reflect the first signal light to the fifth splitting unit 105, the fifth splitting unit 105 is used to demultiplex the first signal light to obtain the third signal light and the fourth signal light, and transmit the third signal light to the receiving module, and reflect the fourth signal light to the sixth splitting unit 106, and the sixth splitting unit 106 is used to reflect the fourth signal light to the receiving module.

[0116] In this case, the first signal light is a signal light obtained by multiplexing signal lights of at least two wavelengths. By providing an additional fifth splitting unit 105 and a sixth splitting unit 106 , the first signal light can be further demultiplexed and sent to different receiving modules for reception.

[0117] For example, when N is 4 and M is 3, the third signal light or the fourth signal light is a signal light obtained by multiplexing signal lights of two wavelengths. At this time, the receiving module corresponding to receiving the multiplexed signal light can be a dual-receiving TO. Therefore, the optical component provided in the embodiment of the present application can support 4 or more signal lights with different wavelengths or wavelength ranges multiplexed.

[0118] When the third signal light is a signal light obtained by multiplexing signal lights of two wavelengths, a filtering unit 201 is provided on the corresponding receiving module.

[0119] It should be understood that the fifth light splitting unit 105 and the sixth light splitting unit 106 are only required to be provided on the basis of the third light splitting unit 103 , and are not limited to being provided on the basis of the fourth light splitting unit 104 .

[0120] 5. Seventh and Eighth Spectroscopic Units

[0121] Based on the fourth case, as shown in FIG9 , the optical splitting module 100 further includes a seventh optical splitting unit 107 and an eighth optical splitting unit 108 , and NM is greater than 1.

[0122] Among them, the fourth splitting unit 104 is specifically used to reflect the second signal light to the seventh splitting unit 107, the seventh splitting unit 107 is used to demultiplex the second signal light to obtain the fifth signal light and the sixth signal light, and transmit the fifth signal light to the receiving module, and reflect the sixth signal light to the eighth splitting unit 108, and the eighth splitting unit 108 is used to reflect the sixth signal light to the receiving module.

[0123] In this case, the second signal light is a signal light obtained by multiplexing signal lights of at least two wavelengths. By providing an additional seventh splitting unit 107 and an eighth splitting unit 108, the second signal light can be further demultiplexed and sent to different receiving modules for reception.

[0124] It should be understood that the seventh light splitting unit 107 and the eighth light splitting unit 108 are only required to be provided on the basis of the fourth light splitting unit 104 , and are not limited to being provided on the basis of the third light splitting unit 103 or other light splitting units.

[0125] 6. Ninth Spectroscopic Unit

[0126] Based on the third case, as shown in FIG10 , the optical splitting module 100 further includes a ninth optical splitting unit 109 .

[0127] The third optical splitting unit 103 is specifically used to reflect the first signal light to the ninth optical splitting unit 109 , and the ninth optical splitting unit 109 is used to reflect the first signal light to the receiving module.

[0128] In this case, by providing an additional ninth light splitting unit 109 , the direction of the first signal light can be further changed, thereby correspondingly changing the position of the receiving module, which is conducive to miniaturization of the optical component.

[0129] For example, based on the additional arrangement of the ninth light splitting unit 109 and the corresponding adjustment of the angle of the fourth light splitting unit 104 , two receiving modules can be arranged on the same side, thereby further miniaturizing the optical component.

[0130] It should be understood that the ninth light splitting unit 109 is only required to be provided on the basis of the third light splitting unit 103 , and is not limited to being provided on the basis of the fourth light splitting unit 104 .

[0131] 7. The tenth light unit

[0132] Based on the sixth case, as shown in FIG11 , the light splitting module 100 further includes a tenth light splitting unit 110 .

[0133] The fourth optical splitting unit 104 is specifically used to reflect the second signal light to the tenth optical splitting unit 110, and the tenth optical splitting unit 110 is used to reflect the second signal light to the receiving module.

[0134] In this case, by providing an additional tenth optical unit 110, the direction of the second signal light can be further changed, thereby correspondingly changing the position of the receiving module, which is conducive to miniaturization of the optical component.

[0135] For example, by additionally providing the tenth optical splitting unit 110 and correspondingly adjusting the angle of the third optical splitting unit 103 , the two receiving modules can be arranged on the same side, thereby further miniaturizing the optical component.

[0136] It should be understood that the tenth light splitting unit 110 is only required to be provided on the basis of the fourth light splitting unit 104 and is not limited to being provided on the basis of the first light splitting unit 103 or other light splitting units.

[0137] Optionally, the first to tenth optical splitting units 101 to 110 and the emission optical splitting unit 302 in the embodiment of the present application can be any one of a filter, a spectroscopic prism or a wave splitter. Each optical splitting unit in the embodiment of the present application is illustrated by a filter.

[0138] It should be understood that in the embodiments of the present application, the optical paths of the input signal light, the output signal light, the first signal light and other signal lights are all parallel optical paths.

[0139] Summarizing the above embodiments, it can be seen that the beneficial effects of the optical assembly provided in the embodiments of the present application include but are not limited to the following three points:

[0140] (1) By setting the angle between the light path and the normal of the light splitting unit, the light splitting unit of the optical component can split light based on a small angle, thereby establishing an extremely narrow light splitting path and realizing the miniaturization of the optical component;

[0141] (2) The built-in wavelength division multiplexer function of the optical component can be directly set in the optical module of the optical line terminal. The optical line terminal can output multiple different wavelength light beams at the corresponding ports without external devices, realizing the miniaturization of the optical line terminal and avoiding the operation and maintenance management problems caused by the addition of new devices;

[0142] (3) By setting up multiple splitting units to change the optical path and correspondingly adjusting the position of the receiving module, the miniaturization of the optical component can be further achieved.

[0143] The optical components provided in the embodiments of the present application are introduced above. The optical module, optical line terminal and optical network unit provided in the embodiments of the present application are introduced below with reference to the accompanying drawings.

[0144] As shown in FIG12 , an embodiment of the present application provides a passive optical network, which may be the passive optical network shown in FIG1 . The passive optical network includes an optical line terminal 400 , an optical network unit 500 , and an optical distribution network 600 .

[0145] The optical line terminal 400 includes an optical module 401, which includes an optical component 402 provided in an embodiment of the present application. The optical network unit 500 also includes an optical module 501, which includes an optical component 502 provided in an embodiment of the present application.

[0146] It should be noted that the optical component 402 in the optical line terminal 400 can directly correspond to any optical component in Figures 3-11, and the optical component 502 in the optical network unit 500 has the opposite propagation direction of the signal light. Any optical component in Figures 3-11 needs to adjust the input signal light, output signal light and the splitter unit in the splitter module to adapt to the signal light in the corresponding wavelength range before it can be directly used in the optical network unit 500.

[0147] Taking the optical line terminal 400 as an example, the optical module 401 provided in the embodiment of the present application may also include devices such as a photoelectric conversion unit. The photoelectric conversion unit is connected to the optical component 402 provided in the embodiment of the present application. However, the embodiment of the present application does not limit the specific internal structure and devices of the optical module 401. The optical component 402 in the optical module 401 can be connected to other devices or adopt other connection methods.

[0148] In the optical line terminal 400 provided in the embodiment of the present application, the optical line terminal 400 may further include devices such as a medium access control (MAC) chip and a line card. The optical module 401 may be connected to the MAC chip through the line card, but the embodiment of the present application does not limit the specific internal structure and devices of the optical line terminal 400. The optical module 401 in the optical line terminal 400 may be connected to other devices or adopt other connection methods.

[0149] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of this application.

[0150] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0151] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0152] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0153] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0154] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

Claims

1. An optical component, characterized in that: It includes a light splitting module and a receiving module, wherein the light splitting module includes a first light splitting unit; The first optical splitter unit is used to receive input signal light from a first direction, the input signal light is signal light obtained by multiplexing signal lights of N passive optical networks, and the angle between the first direction and the normal of the first optical splitter unit is less than or equal to 45 degrees; The first optical splitter unit is further used to demultiplex the input signal light to obtain a first signal light and a second signal light, and transmit the first signal light and the second signal light to the receiving module, the first signal light includes M wavelengths, the second signal light includes NM wavelengths, the M wavelengths correspond to M passive optical networks among the N passive optical networks, and the NM wavelengths correspond to NM passive optical networks among the N passive optical networks; Wherein, N is an integer greater than 1, M is an integer greater than or equal to 1, and M is less than or equal to N-1.

2. The optical assembly according to claim 1, characterized in that An angle between the first direction and a normal line of the first light splitting unit is less than or equal to 13.5 degrees.

3. The optical component according to claim 1 or 2, characterized in that: The optical component further includes a transmitting module, and the light splitting module further includes a second light splitting unit; The transmitting module is used for multiplexing signal lights of N passive optical networks to obtain output signal lights, and transmits the output signal lights to the second optical splitting unit, and the second optical splitting unit is used for transmitting the output signal lights.

4. The optical assembly according to claim 3, characterized in that: The second light splitting unit is further used for receiving input signal light from a second direction, and reflecting the input signal light in the first direction to the first light splitting unit.

5. The optical assembly according to claim 4, characterized in that: An angle between the second direction and a normal line of the second light splitting unit is less than or equal to 45 degrees.

6. The optical assembly according to claim 5, characterized in that: An angle between the second direction and a normal line of the second light splitting unit is less than or equal to 13.5 degrees.

7. The optical assembly according to any one of claims 1 to 6, characterized in that: The light splitting module also includes a third light splitting unit; The first light splitting unit is used to transmit the first signal light to the third light splitting unit; The third light splitting unit is used to reflect the first signal light to the receiving module.

8. The optical assembly according to any one of claims 1 to 7, characterized in that: The light splitting module also includes a fourth light splitting unit; The first light splitting unit is used to reflect the second signal light to the fourth light splitting unit; The fourth light splitting unit is used to reflect the second signal light to the receiving module.

9. The optical assembly according to claim 7 or 8, characterized in that: The light splitting module further includes a fifth light splitting unit and a sixth light splitting unit, and M is greater than 1; The third light splitting unit is specifically used to reflect the first signal light to the fifth light splitting unit; The fifth optical splitter unit is used to demultiplex the first signal light to obtain a third signal light and a fourth signal light, transmit the third signal light to the receiving module, and reflect the fourth signal light to the sixth optical splitter unit; The sixth light splitting unit is used to reflect the fourth signal light to the receiving module.

10. The optical assembly according to claim 8 or 9, characterized in that: The optical splitting module further includes a seventh optical splitting unit and an eighth optical splitting unit, and NM is greater than 1; The fourth light splitting unit is specifically used to reflect the second signal light to the seventh light splitting unit; The seventh optical splitter unit is used to demultiplex the second signal light to obtain a fifth signal light and a sixth signal light, transmit the fifth signal light to the receiving module, and reflect the sixth signal light to the eighth optical splitter unit; The eighth light splitting unit is used to reflect the sixth signal light to the receiving module.

11. The optical assembly according to claim 7 or 8, characterized in that: The optical splitting module further includes a ninth optical splitting unit. The third optical splitting unit is specifically used to reflect the first signal light to the ninth optical splitting unit. The ninth optical splitting unit is used to reflect the first signal light to the receiving module.

12. The optical assembly according to claim 8 or 9, characterized in that: The optical splitting module further includes a tenth optical splitting unit, and the fourth optical splitting unit is specifically used to reflect the second signal light to the tenth optical splitting unit, and the tenth optical splitting unit is used to reflect the second signal light to the receiving module.

13. The optical assembly according to any one of claims 1 to 12, characterized in that: The receiving module comprises receiving ports, the number of which is 1 to N, and the receiving ports are used to receive signal light of at least one passive optical network.

14. The optical assembly according to claim 13, characterized in that: The receiving port comprises a filtering unit, and the filtering unit is used for passing the signal light of the passive optical network matched with the receiving port.

15. The optical assembly according to claim 13 or 14, characterized in that: The receiving port is any one of a coaxial package TO, a butterfly package or a chip-on-board package COB.

16. The optical assembly according to any one of claims 3 to 15, characterized in that: The transmitting module includes N optical transmitters and N-1 to N+1 transmitting light splitting units, and the N-1 to N+1 transmitting light splitting units are used to multiplex the signal lights emitted by the N optical transmitters to obtain the output signal lights.

17. The optical assembly according to any one of claims 3 to 16, characterized in that: The optical assembly further includes an isolation plate, which is used to separate the transmitting module from the receiving module. An optical window is disposed on the isolation plate, which is used to transmit the output signal light.

18. The optical assembly according to any one of claims 1 to 17, characterized in that: The first light splitting unit is any one of a filter, a light splitting prism or a wave splitter.

19. The optical assembly according to any one of claims 1 to 18, characterized in that: The N types of passive optical networks include any N types of gigabit passive optical network GPON, 10 gigabit passive optical network 10G PON / XGPON, 10 gigabit symmetric passive optical network XGSPON, 50 gigabit passive optical network 50G PON, Ethernet passive optical network EPON, 10 gigabit Ethernet passive optical network 10G EPON and 50 gigabit Ethernet passive optical network 50G EPON.

20. An optical module, characterized in that: Comprising the optical component as claimed in any one of claims 1-19.

21. An optical line terminal, characterized in that: Comprising the optical module as claimed in claim 20.

22. An optical network unit, characterized in that: Comprising the optical module as claimed in claim 20.

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