Spectroscopic device, optical wiring network unit, and network system

Abstract

The application provides a light splitting device, an optical distribution network unit and a network system. The light splitting device comprises: a star coupling module provided with at least one first common port, a plurality of first side branch interfaces and a plurality of second side interfaces, a plurality of ring members and a plurality of wavelength division multiplexing modules corresponding to the ring members; a third connecting port of each ring member is connected to a second side interface; a first connecting port of each ring member is connected to a first side branch interface; the wavelength division multiplexing module is used for multiplexing a first downstream optical signal to the corresponding first connecting port and combining the upstream optical signal output by the first side branch interface, so that the upstream optical signal entering through the second connecting port can be looped back to the second connecting port through the star coupling module in sequence. Therefore, the light splitting device, the optical distribution network unit and the network system can reduce the power loss of optical signals when the optical network devices directly communicate.

Description

Technical Field

[0001] The embodiments of this application relate to, but are not limited to, the field of communication technology, and particularly to a beam splitting device, an optical distribution network unit, and a network system. Background Technology

[0002] With the rapid growth of modern communication services, Passive Optical Networks (PONs), capable of providing higher bandwidth, have seen rapid development. PON is a point-to-multipoint network, primarily composed of an Optical Line Terminal (OLT) at the central office, Optical Networking Devices (ONTs) at the user end (such as Optical Network Units (ONUs) or Optical Network Terminations (ONTs)), and an Optical Distribution Network (ODN). The ODN of a PON is an optical distribution network used to branch / couple or multiplex / demultiplex optical signals between the OLT and ODN, and can include passive optical devices such as optical fibers, fiber optic connectors, and wavelength division multiplexers. In related technologies, optical splitters are typically used to form optical distribution networks, such as 3xN splitters and 1xN splitters. However, these optical distribution networks with splitters suffer from excessive uplink and downlink optical power loss due to the splitters passing through them twice during direct communication between optical network devices. This makes them unsuitable for existing single-fiber PON scenarios such as Fiber To The Home (FTTH). Therefore, there is an urgent need for a structural or deployment method that can reduce optical power loss during direct communication between optical network devices. Summary of the Invention

[0003] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0004] This application provides a beam splitter, an optical distribution network unit, and a network system that can reduce optical power loss during direct communication between optical network devices.

[0005] In a first aspect, embodiments of this application provide a beam splitting device, including:

[0006] A star-shaped coupling module, wherein multiple first-side interfaces and multiple second-side interfaces are respectively provided on both sides of the star-shaped coupling module, and each second-side interface is connected to multiple first-side interfaces; the multiple first-side interfaces include multiple first-side branch interfaces and at least one first common port;

[0007] Multiple ring-shaped components are provided, each ring-shaped component having a first connection port, a second connection port, and a third connection port that are unidirectionally connected. The first connection port is connected to a first side branch interface in a one-to-one correspondence. The third connection port is connected to a second side interface. The second connection port is used to output the input uplink optical signal from the connected second side interface to the first common port and multiple first side branch interfaces.

[0008] Multiple wavelength division multiplexing (WDM) modules are provided, each corresponding to one of the multiple ring components. Each WDM module is used to combine a first downlink optical signal with an uplink optical signal output from the corresponding first side branch interface to the first connection port. The first downlink optical signal is the optical signal obtained after the downlink optical signal input to the first common port is split.

[0009] Secondly, embodiments of this application also provide an optical distribution network unit, including any of the beam splitting devices described in the first aspect.

[0010] Thirdly, embodiments of this application also provide an optical network system, including:

[0011] At least one optical line terminal;

[0012] The second aspect is the optical distribution network unit;

[0013] Multiple optical network devices are connected to the optical line terminal via the optical splitter.

[0014] Fourthly, embodiments of this application also provide an optical network system, including:

[0015] At least one optical line terminal;

[0016] In the second aspect, the optical distribution network unit includes a single optical splitter, and the optical line terminal is connected to the first common port of the optical splitter in a one-to-one correspondence.

[0017] Multiple optical network devices are provided, each of which is connected to a second connection port of one of the ring components of the beam splitter.

[0018] Fifthly, embodiments of this application also provide an optical network system, including:

[0019] At least one optical line terminal;

[0020] The second aspect of the optical distribution network unit further includes a beam splitter and a plurality of second beam splitting modules. The optical line terminal and the first common port of the beam splitter are connected one-to-one. The third common port of each of the second beam splitting modules is connected one-to-one to the second connection port of the ring component of the beam splitter.

[0021] Multiple optical network devices are provided, each of which is connected to multiple second branch ends of the second optical splitting module.

[0022] Sixthly, embodiments of this application also provide an optical network system, including:

[0023] At least one optical line terminal;

[0024] The second aspect of the optical distribution network unit includes multiple optical splitting devices. The optical distribution network unit also includes at least one third optical splitting module. The fourth common port of the third optical splitting module is connected to the optical line terminal one by one. The first common ports of the multiple optical splitting devices are respectively connected to the multiple third branch ends of the third optical splitting module.

[0025] Multiple optical network devices are provided, each of which is connected to the second connection port of the ring component of the beam splitter.

[0026] This application embodiment includes: since each third connection port is connected to a second-side interface, and each second-side interface is connected to multiple first-side interfaces, and the first-side interfaces are connected to their corresponding first connection ports, for each uplink optical signal input through the second connection port, after passing through a star coupling module, it will be looped back to the optical path where the first-side branch interface 112 and the corresponding first connection port are located, and then combined with the first downlink signal and output from the second connection port. This enables direct communication with multiple optical network devices with only one pass through the star coupling module. Furthermore, the uplink optical signals from multiple second-side interfaces will also be sent to the first common port for output. When the uplink optical signal is a service signal, uplink transmission of single-fiber services can be achieved. Similarly, after the downlink optical signal is divided into multiple first downlink optical signals, the first downlink optical signals will be multiplexed to the first connection port through the corresponding wavelength division multiplexing module and output from the second connection port, achieving downlink transmission of service signals. Compared to related technologies that use optical splitters, the optical splitting device of this application embodiment enables optical signals for direct communication between optical network devices to pass through only one star coupling module (without reflection) while transmitting services in a single-fiber scenario. This results in lower optical power loss and is beneficial for practical applications. Therefore, the optical splitting device, optical distribution network unit, and network system of this application embodiment can reduce optical power loss when optical network devices communicate directly. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a beam splitter device according to one embodiment of this application;

[0028] Figure 2 This is a schematic diagram of a beam splitter device according to another embodiment of this application;

[0029] Figure 3 This is a schematic diagram of the star-coupled module in an embodiment of this application;

[0030] Figure 4 This is a schematic diagram of PON networking in existing technology;

[0031] Figure 5 This is a network topology diagram of the network system in the first embodiment of this application;

[0032] Figure 6 This is an embodiment of the present application. Figure 5 A schematic diagram of the ONU structure in a network system topology diagram;

[0033] Figure 7 This is a network topology diagram of the network system of the second embodiment in this application;

[0034] Figure 8 This is a network topology diagram of the network system in the third embodiment of this application.

[0035] Figure label:

[0036] 100 beam splitter, 110 star-shaped coupling module, 111 first common port, 112 first side branch interface, 113 second side interface, 120 ring component, 131 first wavelength division multiplexing component, 132 third wavelength division multiplexing component, 133 second wavelength division multiplexing component, 140 first beam splitter module, 141 second common port, 142 first branch end.

[0037] Optical Line Terminal 200

[0038] Optical distribution network unit 300, second optical splitting module 310, third common port 311, third optical splitting module 320, first optical splitting device 330, second optical splitting device 340.

[0039] Optical Network Device 400

[0040] Three-port circulator 500. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0042] It should be noted that although functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0043] With the rapid growth of modern communication services, Passive Optical Networks (PONs), capable of providing higher bandwidth, have seen rapid development. PON is a point-to-multipoint network, primarily composed of an Optical Line Terminal (OLT) at the central office, Optical Networking Devices (ONTs) at the user end (such as Optical Network Units (ONUs) or Optical Network Terminations (ONTs)), and an Optical Distribution Network (ODN). The ODN of a PON is an optical distribution network used to branch / couple or multiplex / demultiplex optical signals between the OLT and ODN, and can include passive optical devices such as optical fibers, fiber optic connectors, and wavelength division multiplexers. In related technologies, optical splitters are typically used to form optical distribution networks, such as 3xN splitters and 1xN splitters. However, in these optical distribution networks, when optical network devices communicate directly (e.g., during burst signal transmission), the optical signal emitted by the optical network device needs to pass through the common end of the splitter before being forwarded. During forwarding, it also needs to pass through another splitter before being received by other optical network devices that need to communicate. Therefore, there is optical power loss due to passing through the splitter twice, resulting in excessive loss of uplink and downlink signal optical power. Consequently, this approach is not suitable for existing single-fiber PON scenarios such as Fiber to the Home (FTTH). Therefore, there is an urgent need for a structure or deployment method that can reduce optical power loss during direct communication between optical network devices. Based on this, this application proposes an optical splitter, an optical distribution network unit, and a network system that can reduce optical power loss during direct communication between optical network devices.

[0044] It should be noted that the accompanying drawings in this application only show partial wiring relationships between the first side interface, the second side interface 113, and the first branch terminal 142. For the same star-coupled module 110, the wiring of the optical network device 400 can be referenced to the wiring shown in the drawings. Similarly, the optical splitter and the first optical splitting module 140, the second optical splitting module 310, and the third optical splitting module 320 only show partial fiber optic line connections. It should be noted that in the following specific embodiments, the optical network device 400 is used as an ONU for example.

[0045] Reference Figures 1 to 8 As shown, a beam splitting device 100 according to an embodiment of this application includes:

[0046] The star-shaped coupling module 110 has multiple first-side interfaces and multiple second-side interfaces 113 on both sides, and each second-side interface 113 is connected to multiple first-side interfaces. The multiple first-side interfaces include multiple first-side branch interfaces 112 and at least one first common port 111.

[0047] Multiple ring components 120 are provided, each with a unidirectionally connected first connection port, second connection port, and third connection port. The first connection port is connected to a first side branch interface 112 in a one-to-one correspondence. The third connection port is connected to a second side interface 113. The second connection port is used to output the input uplink optical signal from the connected second side interface 113 to the first common port 111 and multiple first side branch interfaces 112.

[0048] Multiple wavelength division multiplexing (WDM) modules are provided, and each WDM module corresponds to a ring component 120. The WDM module is used to combine the first downlink optical signal with the uplink optical signal output from the corresponding first side branch interface 112 to the first connection port. The first downlink optical signal is the optical signal obtained after the downlink optical signal input to the first common port 111 is split.

[0049] Therefore, since each third connection port is connected to a second-side interface 113, and each second-side interface 113 is connected to multiple first-side interfaces, and the first-side interfaces are connected to their corresponding first connection ports, for each uplink optical signal input through the second connection port, after passing through the star coupling module 110 once, it will be looped back to the optical path where the first-side branch interface 112 and the corresponding first connection port are located, and then combined with the first downlink signal and output from the second connection port. This enables direct communication with multiple optical network devices 400 with only one pass through the star coupling module 110. Furthermore, the uplink optical signals from multiple second-side interfaces 113 will also be sent to the first common port 111 for output. When the uplink optical signal is a service signal, it can realize the uplink transmission of single-fiber services. Similarly, after the downlink optical signal is divided into multiple first downlink optical signals, the first downlink optical signals will be multiplexed to the first connection port through the corresponding wavelength division multiplexing module and output from the second connection port, realizing the downlink transmission of service signals. Compared to related technologies that use optical splitters, the optical splitter of this application embodiment enables optical signals for direct communication between optical network devices 400 to pass through only one star coupling module without reflection during service transmission in a single-fiber scenario, resulting in lower optical power loss and facilitating practical applications. Therefore, the optical splitter 100, optical distribution network unit 300, and network system of this application embodiment can reduce optical power loss during direct communication between optical network devices 400.

[0050] It should be noted that, referring to Figure 3 As shown, all the interfaces on the first side of the star-coupled module 110 are first-side interfaces, and all the interfaces on the second side of the star-coupled module 110 are second-side interfaces. Uplink optical signals entering from the second-side interface 113 will be output from any one of the first-side interfaces, and downlink optical signals input from the first common port 111 will be output from any one of the second-side interfaces 113.

[0051] It should be noted that in some embodiments, any first-side interface and any second-side interface 113 of the star-coupled module 110 are interconnected, and any one of the multiple first-side interfaces can serve as the first common port 111. In practical applications, one or more first-side interfaces can be manually determined as the first common port 111 according to actual networking requirements, and the remaining first-side interfaces can serve as first-side branch interfaces 112; wherein, the number of first common ports 111 is selectively set according to the number of OLTs connected to the port. In this case, the same number of second-side interfaces 113 as the number of first-side branch interfaces 112 can all be used to connect ONUs. In application, connecting the second-side interface 113 to an ONU can realize direct communication between multiple ONUs and service transmission between the OLT and the ONU.

[0052] It should be noted that in some embodiments, only the second-side interface 113 is unidirectionally connected to the transmission direction of any one of the first-side interfaces, and the first common port 111 is unidirectionally connected to the transmission direction of any one of the second-side interfaces 113. In practical applications, it is necessary to connect the first common port 111 to the OLT.

[0053] It should be noted that this application does not limit whether the number of the first-side interface and the second-side interface 113 are the same.

[0054] For example, taking the number of second-side interfaces 113 and first-side interfaces being the same, after determining that the number of first common ports 111 is n1, the second-side interfaces 113 with the same number of n1 are discarded among the multiple second-side interfaces 113, so that the other second-side interfaces 113 can all be used to connect one ONU. This allows for normal service processing while communication between ONUs can be achieved through only one star coupling module 110. Assuming that the first-side interfaces of the star coupling module 110 are set to M, and the number of first common ports 111 is 1, then the number of first-side branch interfaces 112 is M-1. Correspondingly, the number of second-side interfaces 113 that can be used for ONUs is M-1. In this case, one star coupling module 110 can connect a maximum of M-1 ONUs.

[0055] For example, if the number of second-side interfaces 113 is inconsistent with the number of first-side interfaces, the number of second-side interfaces 113 is consistent with the maximum number of ONUs actually supported, and the number of first-side interfaces is consistent with the number of second-side interfaces 113 and the number that can be set as the first common port 111. For example, if the specification of second-side interfaces 113 is set to 5, and the number of first common ports 111 that can be set is 3, then the number of first-side interfaces is 8.

[0056] It should be noted that the downlink optical signal λ down The beam splitting processing can be performed by the star-coupled module 110 itself to obtain multiple first downlink optical signals, which are then output by the second-side interface 113, such as... Figure 1 As shown. In other embodiments, the downlink optical signal input to the first common port 111 can also be split by other optical splitting modules to obtain multiple first downlink optical signals, which are then multiplexed to the first connection port 1. When the optical splitting module is a splitter, refer to the example shown below. Figure 2 As shown.

[0057] It should be noted that in practical applications, refer to Figure 4The optical splitter network shown can be directly replaced by the optical splitter (i.e., the Spliter in the figure) in the existing network, or it can be deployed in a new network. The optical splitter 100 in this embodiment can be applied to single-fiber-to-the-home scenarios or other PON application scenarios. Therefore, this embodiment does not limit the use of the optical splitter 100. For example, refer to... Figure 5 As shown, the first public port 111 is connected to the optical line terminal 200, thereby realizing the single fiber to the home scenario.

[0058] It should be noted that, in the embodiments of this application, the beam splitting device 100 can be an integrated component or a combination of independent star-coupled modules 110, ring components 120, and multiplexing modules. For example, taking a combination as an example, a star coupler is used as the star-coupled module 110, a circulator as the ring component 120, and multiple wavelength division multiplexers are combined to form a multiplexing module. In practical applications, the star coupler, multiple circulators, and multiple wavelength division multiplexers are combined according to the optical path to obtain the beam splitting device 100. The number of circulators can be the same as the number of ONUs in actual application or the number of first-side branch interfaces 112. This embodiment of the application does not impose any limitations on this. Taking a single first common port 111 as an example, one of the first-side interfaces on one side of the star coupler is designated as the first common port 111, while one of the second-side interfaces 113 on the other side of the star coupler is discarded. In this case, the uplink optical signal entering the second-side interface 113 can be output from any of the first-side interfaces, and the first-side interface not designated as the first common port 111 can loop back the uplink signal to the first connection port of the circulator. The star coupler will then process the downlink optical signal λ input from the first common port 111. up A first downlink optical signal is output from any second-side interface, and each output first downlink optical signal is multiplexed to a first connection port of a circulator via a wavelength division multiplexer. In other embodiments, other structural combinations may be used to achieve the function of the star-coupled module as described in this application, and this application does not limit the implementation of such modules.

[0059] It should be noted that the optical splitter 100 of this application embodiment can multiplex the uplink optical signal λ used for service processing when communication between optical network devices 400 is required. up and downlink optical signal λ down The wavelength. For example, taking a PON scenario supporting burst mode as an example, the wavelength of the uplink optical signal used for service processing is λ. up The wavelength of the downlink optical signal used for service processing is λ. down In burst mode, the wavelength of the burst signal can be set to λ. up At this point, there is no need to use a third wavelength as the wavelength for the burst signal, thus saving spectrum resources.

[0060] It should be noted that, taking the connection of the second-side interface 113 to the ONU as an example, in burst mode, related technologies typically set a fiber Bragg grating at the common end of the splitter to reflect the optical signal output from the common end of the splitter. Frequency division multiplexing (FDM) is then used for burst signal communication. However, in this embodiment, since loopback is achieved by connecting the first-side interface to the first connection port 121, time division multiplexing can be used for communication when sending burst signals to multiple ONUs. Relatively speaking, the amount of information that ONUs can communicate with each other can be set higher in this embodiment. In other embodiments, burst signals are routed back and forth by the OLT, requiring the OLT to re-queue and re-modulate so that each ONU can receive the burst signal. In this application, however, direct loopback eliminates the need for re-routing, re-queueing, and re-modulation, enhancing network reliability and energy efficiency. This saves downlink bandwidth by reducing the need for the OLT to send re-modulated communication signals between ONUs, thus improving downlink bandwidth utilization. Direct communication between ONUs can also significantly reduce communication latency.

[0061] It should be noted that in this embodiment, the actual service wavelength can be output through the first common port 111 or multiple second connection ports 2. Therefore, in the FTTH scenario, only the FTTH splitter needs to be replaced with the splitter device 100 of this application to realize the single fiber resource to the user using other existing equipment, without the need to deploy additional optical fibers, making the transformation simpler.

[0062] Understandably, referring to Figure 1 As shown, the wavelength division multiplexing (WDM) module includes a first WDM multiplexer 131 and a second WDM multiplexer 133. The first WDM multiplexer 131 is disposed between the first connection port 1 and the first side branch interface 112 of the corresponding ring device 120; the second WDM multiplexer 133 is disposed between the third connection port 3 and the second side interface 113 of the corresponding ring device 120. By configuring the first WDM multiplexer 131 and the second WDM multiplexer 133, the output of the second side interface 113 is multiplexed to the first connection port 1 in the downlink direction to realize the transmission of downlink services.

[0063] It should be noted that the first wavelength division multiplexing (WDM) unit 131 is used to combine the first downlink optical signal with the corresponding uplink optical signal output from the first side branch interface 112 to the first connection port. The second WDM unit 133 is used to output the first downlink optical signal output from the second side interface 113 from the demultiplexing port to the corresponding multiplexing port of the first WDM unit 131.

[0064] It should be noted that in some embodiments, the beam splitter 100 may include a first wavelength division multiplexing (WDM) component 131, a third WDM component 132, a second WDM component 133, and a first beam splitting module 140. When the beam splitter 100 is in a combined state, the components can be combined according to the actual application scenario. When the beam splitter 100 is in an integrated mode, multiple switches can be set to allow the beam splitter 100 to form a certain configuration under certain conditions. Figure 1 The optical signal transmission path shown may, in other cases, cause the beam splitter 100 to form a pattern as described above. Figure 2 The optical signal transmission path is shown; however, this application does not limit the scope of the embodiments.

[0065] Understandably, referring to Figure 2 As shown, the wavelength division multiplexing (WDM) module includes a first WDM multiplexer 131, which is disposed between the first connection port 1 and the first side branch interface 112 of the corresponding ring component 120. By setting the first WDM multiplexer 131, the first downlink signal is multiplexed onto the optical path of the first side branch interface 112 and the first connection port 1, so that the first downlink signal can be output from the first connection port 1 to the second connection port 2.

[0066] It should be noted that the first connection port 1 and the first side branch interface 112 are connected by optical fiber.

[0067] For example, refer to Figure 2 As shown, an external first optical splitter module 140 can be configured, with its first branch ends 142 connected to the first wavelength division multiplexing unit 131 respectively. The number of first branch ends 142 of the first optical splitter module 140 is greater than the number of first wavelength division multiplexing units 131. When the downlink optical signal λ down After outputting from the first branch end 142 of the first optical splitter module 140, it is multiplexed by the first wavelength division multiplexing (WDM) unit 131 onto the optical path between the first connection port 1 and the first side branch interface 112; thus, downlink and uplink optical signals are combined and output from the second connection port. Uplink transmission can be achieved by multiplexing the second common port 141 of the external first optical splitter module 140 and the first common port 111 of the optical splitter device 100 through the external third WDM unit 132. The first optical splitter module 140 can split an optical signal of one wavelength into multiple optical signals of different power, which are then output from the first branch end 142 respectively. When the optical splitter device 100 is combined, in practical applications, the remaining components, the first optical splitter module 140 and the third WDM unit 132, can be purchased and combined according to the application scenario to achieve the desired result. Figure 2 The structure shown is not limited in this application embodiment regarding the structure of the beam splitter 100.

[0068] For example, refer to Figure 1As shown, an external second wave division multiplexing component 133 can also be set to achieve the following: Figure 1 The multiplexing of the first downlink signal is shown.

[0069] Understandably, referring to Figure 2 As shown, the wavelength division multiplexing module also includes a third wavelength division multiplexing component 132; the third wavelength division multiplexing component 132 is connected to the first common port 111.

[0070] It should be noted that the third wavelength division multiplexing component 132 is used to output the downlink optical signal from the demultiplexing port to the second common port 141 of the first optical splitting module 140.

[0071] It should be noted that by setting the first wavelength division multiplexing component 131 and the third wavelength division multiplexing component 132 in the beam splitting device 100, only one first beam splitting module 140 needs to be used. In this case, the deployment of the beam splitting device 100 is simpler.

[0072] Understandably, referring to Figure 2 As shown, the beam splitting device 100 also includes a first beam splitting module 140. The second common port 141 of the first beam splitting module 140 is connected to the third wavelength division multiplexing component 132. The multiple first branch ends 142 of the first beam splitting module 140 are respectively connected to the first wavelength division multiplexing component 131 of the multiple wavelength division multiplexing modules.

[0073] It should be noted that by arranging the first beam splitting module 140, the first wavelength division multiplexing component 131, and the third wavelength division multiplexing component 132 all in the beam splitting device 100, the deployment method of the beam splitting device 100 can be further simplified.

[0074] For example, refer to Figure 2 As shown, taking the star coupling module 110 as an example of an (N+1)x(N+1) star coupler, apart from the branch fiber port 1 connected to the OLT via the backbone fiber, the other N ports on the left side of the (N+1)x(N+1) star coupler can be connected to the corresponding right-side distribution fiber via distribution fibers to the ONU's operating wavelength λ. up A burst optical signal receiver. The backbone fiber port 1 on the left side of the star coupler OLT, corresponding to the distribution fiber port 1 on the right side, is discarded and not connected to any ONU; thus, the branch end connected to the backbone fiber port 1 forms the first common port 111. The OLT side operating wavelength λ down For downlink continuous optical signals and operating wavelength λ up The uplink burst optical signal is demultiplexed by a third wavelength division multiplexer (WDM) 132 and then enters a standard 1xN optical splitter to split it into N branch optical fibers for output. The ONU operates at wavelength λ. upThe uplink burst optical signal enters port 2 of the ring assembly 120 via the distributed optical fiber and exits from port 3. It then propagates through the optical fiber on the right side of the star coupler to the left side and exits from any port on the left. The uplink burst optical signal exits from port 1 on the left side of the star coupler and reaches the OLT. The other N ports on the left side also output uplink burst optical signals. The operating wavelength of the output from a certain port on the left is λ. up The uplink burst optical signal is transmitted through the third wavelength division multiplexing unit 132 and the corresponding ordinary optical splitter output at a working wavelength of λ. down The downlink optical signal is combined and enters the first connection port 1 of the ring component 120, and is output from the second connection port 2.

[0075] It is understood that, secondly, the optical distribution network unit 300 according to the embodiments of this application includes at least one optical splitter 100 according to any one of the first aspects. By setting up the optical distribution network unit 300 including the optical splitter 100, the deployment method of the PON system can be simplified.

[0076] Understandably, referring to Figures 5 to 8 Thirdly, the network system provided according to the embodiments of this application includes:

[0077] At least one optical line terminal 200;

[0078] The second aspect is the optical distribution network unit 300;

[0079] Optical network device 400, multiple optical network devices 400 are provided, and optical network devices 400 are connected to optical line terminal 200 through optical splitter 100.

[0080] It should be noted that, referring to Figures 5 to 8 The embodiment shown uses at least one optical splitter 100 in the optical distribution network unit 300, which reduces power loss by one step compared to a scenario where all optical splitters are used. Therefore, it can reduce power loss when communicating between optical network devices 400.

[0081] Understandably, referring to Figure 5 As shown, in a fourth aspect, a network system eliminated according to this application includes:

[0082] At least one optical line terminal 200;

[0083] For example, in the second aspect, the optical distribution network unit 300 includes a splitter 100, and the optical line terminal 200 is connected to the first common port 111 of the splitter 100 in a one-to-one correspondence.

[0084] Multiple optical network devices 400 are connected to the second connection port of a ring component 120 of the optical splitter 100.

[0085] For example, refer to Figure 3 and 4 The PON system consists of an OLT, user-end ONUs, and a splitter 100 forming an optical distribution network (ODN). While maintaining the existing PON wavelength plan and keeping the OLT and other ODN devices unchanged (except for the splitter), point-to-multipoint communication between the optical line terminal 200 (OLT) and optical network units (ONUs) compatible with direct internal communication between ONUs is achieved by replacing the original 1xN splitter with the splitter 100 and replacing the original ONU with a new one.

[0086] For example, refer to Figure 5 and Figure 6 As shown; taking the star coupling module 110 as an (N+1)x(N+1) star coupler as an example, apart from the branch fiber port 1 (corresponding to the first common port 111) on the left side connected to the OLT via the backbone fiber, the other N ports on the left can be connected to the corresponding ONU burst optical signal receivers on the right side via distribution fibers. The backbone fiber port 1 on the left side of the star coupler corresponding to the distribution fiber port 1 on the right side is discarded, i.e., not connected to any ONU. The OLT operating wavelength is λ. down The downlink continuous optical signal is transmitted to the right via the backbone fiber on the left side of the star coupler (corresponding to the first common port 111), and output from all branch fibers on the right side (corresponding to the second side interface 113). The operating wavelength is λ. down Downlink continuous optical signal and operating wavelength of λ up The uplink burst optical signal is wavelengthly divided by a second wavelength division multiplexer (WDM) 133 and then extracted separately from the port branch fiber. The ONU operates at wavelength λ. up The uplink burst optical signal enters the second connection port 2 of the ring component 120 through the distributed optical fiber and is output from the third connection port 3. It is then transmitted through the optical fiber on the right side of the star coupler to the left side of the star coupler and output from any port on the left. The uplink burst optical signal is output from port 1 on the left side of the star coupler to reach the OLT; the other N ports on the left side also output uplink burst optical signals. Let the operating wavelength of the output from a certain port on the left be λ. up Taking the uplink burst optical signal as an example, the operating wavelength λ is obtained by the first wavelength division multiplexing unit 131 and the corresponding right port by the second wavelength division multiplexing unit 133. down The downlink optical signal is combined and enters the first connection port 1 of the circulator, and is output from the second connection port 2. (Refer to...) Figure 6As shown, the ONU includes a downlink optical signal continuous / burst receiver, an uplink optical signal burst transmitter, and a three-port circulator 500. The wavelength λ of the downlink continuous / burst transmitted optical signal is... down and operating wavelength λ up The uplink burst optical signal enters port 2 of the three-port circulator 500 from the distribution fiber, and exits from port 3 of the three-port circulator 500 before entering the continuous optical signal receiver and the burst optical signal receiver, respectively. The wavelength of the uplink burst optical signal is λ. up The uplink burst optical signal enters port 1 of the three-port circulator 500 and is output from port 2 of the three-port circulator 500 to the second connection port 2 of the ring component 120 of the beam splitter 100.

[0087] Understandably, referring to Figure 7 As shown, in a fifth aspect, a network system according to an embodiment of this application includes:

[0088] At least one optical line terminal 200;

[0089] The second aspect is the optical distribution network unit 300, which further includes a beam splitter 100 and a plurality of second beam splitting modules 310. The optical line terminal 200 and the first common port 111 of the beam splitter 100 are connected one-to-one. The third common port 311 of each of the second beam splitting modules 310 is connected one-to-one to the second connection port of the ring member 120 of the beam splitter 100.

[0090] Multiple optical network devices 400 are connected to multiple second branches of the second optical splitting module 310.

[0091] For example, refer to Figure 7 As shown, in a multi-level optical splitter network (ODN), a splitter device 100 can be used to achieve flexible network topology. By using the splitter device 100 in the first-level splitter and keeping the traditional splitter (corresponding to the second splitter module 310) in the second-level splitter, direct communication between all ONUs can be achieved. Uplink burst optical signals only need to pass through the first-level splitter device 100 once, but the second-level splitter requires two passes. Compared to a structure where both the first and second levels use splitters, the embodiment of this application reduces power consumption by one step.

[0092] Understandably, referring to Figure 8 As shown, in a sixth aspect, the network system proposed according to embodiments of this application includes:

[0093] At least one optical line terminal 200;

[0094] The second aspect is the optical distribution network unit 300, which includes multiple optical splitting devices 100. The optical distribution network unit 300 also includes at least one third optical splitting module 320. The fourth common port of the third optical splitting module 320 is connected to the optical line terminal 200. The first common ports 111 of the multiple optical splitting devices 100 are respectively connected to the multiple third branch ends of the third optical splitting module 320.

[0095] Multiple optical network devices 400 are connected to the second connection port of the ring component 120 of the beam splitter 100.

[0096] It should be noted that, referring to Figure 8 As shown, in the second-stage optical splitter, a splitter 100 is used. For uplink burst optical signals, direct communication between ONUs located in the second-stage optical splitter can be achieved by passing through the first-stage optical splitter 100 only once, without needing to pass through the first-stage optical splitter at all. Therefore, compared to traditional two-stage optical splitters, the network system of this application embodiment can reduce communication losses between ONUs.

[0097] It should be noted that, Figures 5 to 8 This is a preferred network configuration for an embodiment of the present application. In practical applications, the optical splitter 100 can be applied to, except for... Figures 5 to 8 Other network configurations, such as those using splitters with 3 or more levels, are available in [the following context]. Figure 8 Other beam splitters or beam splitters may be added between the two beam splitters 100. Those skilled in the art can, based on any of the beam splitters 100 in the first aspect and in conjunction with the appendix... Figure 1 and Figure 2 A network system other than those described in this application can be obtained.

[0098] It should be noted that the first wavelength division multiplexing component 131, the third wavelength division multiplexing component 132, and the second wavelength division multiplexing component 133 can be devices with the same function as a wavelength division multiplexer, or they can be wavelength division multiplexers.

Claims

1. A beam splitting device, the beam splitting device comprising: A star-shaped coupling module, wherein multiple first-side interfaces and multiple second-side interfaces are respectively provided on both sides of the star-shaped coupling module, and each second-side interface is connected to multiple first-side interfaces; the multiple first-side interfaces include multiple first-side branch interfaces and at least one first common port; Multiple ring-shaped components are provided, each ring-shaped component having a first connection port, a second connection port, and a third connection port that are unidirectionally connected. The first connection port is connected to a first side branch interface in a one-to-one correspondence. The third connection port is connected to a second side interface. Multiple wavelength division multiplexing modules, each corresponding one-to-one with a multiple ring element; in, Each of the ring components receives an uplink optical signal through the second connection port and outputs it through the third connection port. The uplink optical signal output from the third connection port enters the corresponding second-side interface and is split by the star coupling module before being output from each of the first-side branch interfaces and the first common port. The uplink optical signal output from each first-side branch interface is looped back to the corresponding wavelength division multiplexing module. The wavelength division multiplexing module is used to combine the first downlink optical signal with the uplink optical signal output from the corresponding first-side branch interface to the first connection port. Each ring component receives the signal combined by the corresponding wavelength division multiplexing module through the first connection port and outputs it through the second connection port. The first downlink optical signal is the optical signal obtained after the downlink optical signal input to the first common port is split.

2. The spectrophotometer according to claim 1, characterized in that... The wavelength division multiplexing module includes a first wavelength division multiplexing component and a second wavelength division multiplexing component. The first wavelength division multiplexing component is disposed between the first connection port of the corresponding ring component and the first side branch interface; the second wavelength division multiplexing component is disposed between the third connection port of the corresponding ring component and the second side interface.

3. The spectrophotometer according to claim 1, characterized in that... The wavelength division multiplexing module includes a first wavelength division multiplexing component, which is disposed between the first connection port of the corresponding ring component and the first side branch interface.

4. The spectrophotometer according to claim 3, characterized in that... The beam splitting device further includes a third wavelength division multiplexing (WDM) component; the third WDM component is connected to the first common port.

5. The spectrophotometer according to claim 4, characterized in that... The beam splitting device further includes a first beam splitting module, the second common port of the first beam splitting module is connected to the third wavelength division multiplexing component, and the multiple first branch ends of the first beam splitting module are respectively connected to the first wavelength division multiplexing components of the multiple wavelength division multiplexing modules.

6. An optical distribution network unit, the optical distribution network unit comprising at least one beam splitter as described in any one of claims 1 to 5.

7. A network system, the network system comprising: At least one optical line terminal; The optical distribution network unit as described in claim 6; Multiple optical network devices are connected to the optical line terminal via the optical splitter.

8. A network system, the network system comprising: At least one optical line terminal; As described in claim 6, the optical distribution network unit is configured as one, and the optical line terminal is connected to the first common port of the optical splitter in a one-to-one correspondence. Multiple optical network devices are provided, each of which is connected to a second connection port of one of the ring components of the beam splitter.

9. A network system, the network system comprising: At least one optical line terminal; The optical distribution network unit as described in claim 6 further includes one of the optical splitting devices and a plurality of second optical splitting modules, wherein the optical line terminal and the first common port of the optical splitting device are connected one-to-one; and the third common port of each of the second optical splitting modules is connected one-to-one to the second connection port of the ring component of the optical splitting device. Multiple optical network devices are provided, each of which is connected to multiple second branch ends of the second optical splitting module.

10. A network system, the network system comprising: At least one optical line terminal; As described in claim 6, the optical distribution network unit includes multiple optical splitting devices, and the optical distribution network unit further includes at least one third optical splitting module. The fourth common port of the third optical splitting module is connected to the optical line terminal one by one, and the first common ports of the multiple optical splitting devices are respectively connected to the multiple third branch ends of the third optical splitting module. Multiple optical network devices are provided, each of which is connected to the second connection port of the ring component of the beam splitter.

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