Optical terminal device and communication system

Abstract

The embodiment of the utility model provides optical terminal equipment and a communication system, which are used for realizing connection between convergence equipment and access equipment, effectively reducing optical fiber resources required by connection between the convergence equipment and the access equipment and detecting whether an optical module is in an in-place state or a separation state. Wherein when the optical module is in the in-place state, the optical module is installed on the optical terminal equipment, and when the optical module is in the out-of-place state, the optical module is not installed on the optical terminal equipment. The optical terminal equipment comprises a fixed frame, a wavelength division multiplexer and M first optical modules, M is any integer not smaller than 1, the fixed frame is provided with the wavelength division multiplexer, a first wavelength division port of the wavelength division multiplexer is connected with a first branch optical fiber, the first optical modules are detachably installed on the fixed frame, and the first optical modules are connected with the first branch optical fiber. And the first optical module is connected with one first wave division port of the wavelength division multiplexer through the first branch optical fiber.

Description

Technical Field

[0001] The present application relates to the field of optical fiber communication technology, and in particular to an optical terminal device and a communication system. Background Art

[0002] The communication system includes a convergence device and an access device. As the number of access devices included in the communication system increases, the demand for optical fiber resources connected between the convergence device and the access device also increases.

[0003] In order to reduce the demand for optical fiber resources, a wavelength combination and demultiplexing device is added on the access device side. The wavelength combination and demultiplexing device receives multiple wavelengths from one or more access devices through different optical fibers, combines the multiple wavelengths into one, and sends it to the aggregation device through one optical fiber.

[0004] However, the existing wavelength combining and demultiplexing devices only have the functions of combining and demultiplexing, and the connection status between the wavelength combining and demultiplexing devices and the optical module needs to be checked manually, which reduces the efficiency of obtaining the connection status between the wavelength combining and demultiplexing devices and the optical module. Utility Model Content

[0005] The embodiment of the present application provides an optical terminal device and a communication system, wherein the optical terminal device is used to realize the connection between the aggregation device and the access device, effectively reducing the optical fiber resources required for the connection between the aggregation device and the access device, and can detect whether the optical module is in the in-place state or the disengaged state. The in-place state of the optical module means that the optical module is installed on the optical terminal device, and the disengaged state of the optical module means that the optical module is not installed on the optical terminal device.

[0006] In the first aspect, an embodiment of the present application provides an optical terminal device, including a fixed frame, a wavelength division multiplexer, and M first optical modules, wherein M is an arbitrary integer not less than 1, the wavelength division multiplexer is installed on the fixed frame, the wavelength division multiplexer's combined wave port is connected to a trunk optical fiber, the wavelength division multiplexer's first split wave port is connected to a first branch optical fiber, the first optical module is detachably mounted on the fixed frame, and the first optical module is connected to one of the first split wave ports of the wavelength division multiplexer through the first branch optical fiber. If it is necessary to detect whether the first optical module is in place, then the convergence device sends a detection optical signal to the wavelength division multiplexer through the trunk optical fiber, and the first optical module reflects an echo optical signal to the convergence device based on the detection optical signal, and the convergence device can successfully detect whether the first optical module is in place based on the amplitude of the echo optical signal.

[0007] According to the present aspect, in the process of detecting whether each optical module on the optical terminal device is in the in-place state, there is no need to power the optical terminal device. Whether the optical module of the optical terminal device is in the in-place state or in the disengaged state can be directly detected at the convergence device. Therefore, in the process of detecting whether the optical module is in the in-place state, there is no need for the operation and maintenance personnel to reach the optical terminal device, which improves the efficiency and accuracy of the detection. If it is necessary to open a service, then the access device is directly connected to the first optical module determined to be in the in-place state, which improves the speed of opening the service.

[0008] Based on the first aspect, in an optional implementation, the optical terminal device further includes a second branch optical fiber, one end of the second branch optical fiber is connected to a second wavelength division port of the wavelength division multiplexer, and the other end of the second branch optical fiber is suspended.

[0009] By adopting this implementation method, the other end of the second branch optical fiber is suspended in the air. Then, the amplitude of the reflection of the second branch optical fiber to the converging device is different from the amplitude of the reflection of the first branch optical fiber to the converging device. The converging device can quickly and accurately locate the optical module in the optical terminal device that is in a disconnected state, thereby improving the efficiency of detecting the state change of the optical module. If the optical module of the optical terminal device is lost (that is, the other end of the second branch optical fiber is suspended in the air), it can be discovered in time.

[0010] Based on the first aspect, in an optional implementation, the optical terminal device further includes a reflective film, which is disposed on the first optical module or the wavelength division multiplexer, and is used to reflect the received detection optical signal.

[0011] By adopting this implementation method, the reflectivity of the reflective film will enable the reflective film to reflect the detection light signal with a specific wavelength toward the convergence device. The convergence device can detect whether the optical module is in place, whether the wavelength division multiplexer is in place, whether the optical terminal device is in place, etc. according to the amplitude of the reflection by the reflective film.

[0012] Based on the first aspect, in an optional implementation, the optical terminal device further includes an outer shell, and the outer shell accommodates the fixing frame. With this implementation, since the fixing frame is located inside the outer shell, the outer shell can protect the fixing frame from dust and water, thereby improving the reliability and service life of the optical terminal device.

[0013] Based on the first aspect, in an optional implementation, the optical terminal device also includes a third branch optical fiber and a second optical module, one end of the second optical module is connected to a third wavelength division port of the wavelength division multiplexer through the third branch optical fiber, and the other end of the second optical module is used to connect to an access device.

[0014] By adopting this implementation method, if the access device needs to be connected to the aggregation device to realize the opening of the service, the second optical module that is determined to be in place can be connected to the access device, so as to realize the conduction of the optical path between the aggregation device and the access device. Because the optical terminal device and the aggregation device are pre-connected through the trunk optical fiber, there is no need to add new optical fiber resources between the aggregation device and the optical terminal device, which effectively saves the optical fiber resources required to connect the access device to the aggregation device and improves the speed of opening the service of the access device.

[0015] Based on the first aspect, in an optional implementation, the fixed frame is installed with an optical coupler, one end of the optical coupler is connected to the combining port of the wavelength division multiplexer, and the other end of the optical coupler is used to connect the first trunk optical fiber and the second trunk optical fiber respectively, and the first trunk optical fiber and the second trunk optical fiber are also used to connect a convergence device.

[0016] By adopting this implementation method, the optical coupler can realize protection switching between the first trunk optical fiber and the second trunk optical fiber, that is, when the first trunk optical fiber is normal, the optical path between the first trunk optical fiber and the wavelength division multiplexer is connected, and when the second trunk optical fiber is normal, the optical path between the second trunk optical fiber and the wavelength division multiplexer is connected, which effectively ensures the reliability of optical signal transmission between the aggregation device and the optical terminal device.

[0017] Based on the first aspect, in an optional implementation, the fixing frame is connected to a dust cover, and the M first optical modules are located in the dust cover. With this implementation, the M first optical modules are located in the dust cover, effectively achieving waterproof, dustproof and other protection effects on the M first optical modules.

[0018] Based on the first aspect, in an optional implementation, the fixing frame includes a mounting groove, the notch of the mounting groove is installed with a protection module, the protection module is used to accommodate the protection module, and the protection module is used to accommodate the first optical module. With this implementation, the detachable connection between the first optical module and the fixing frame is ensured, and the protection module is used to protect the first optical module from dust and water, thereby increasing the service life of the first optical module.

[0019] Based on the first aspect, in an optional implementation, an elastic member is included between the protection module and the mounting groove, and the elastic member is respectively abutted against the protection module and the mounting groove, thereby preventing impurities such as dust or moisture from entering the protection module to damage or contaminate the first optical module, thereby improving the safety of the first optical module.

[0020] In a second aspect, an embodiment of the present application provides a communication system, comprising a convergence device and an optical terminal device as described in any one of the first aspects above, wherein the convergence device and the optical terminal device are connected via a trunk optical fiber.

[0021] For a description of the beneficial effects of this aspect, please refer to the first aspect. The aggregation device shown in this aspect can also detect the quality parameters of each optical fiber link between the aggregation device and the optical terminal device based on the amplitude of the reflection of the first optical module, so as to facilitate operation and maintenance, fault identification, troubleshooting and other operation and maintenance operations for each optical fiber link. The aggregation device can also detect the on and off of each optical fiber link. For example, if it is detected that the optical module is in place, it means that the optical fiber link between the aggregation device and the optical module is in a conducting state. Then, based on the detection of each optical fiber link, the aggregation device effectively avoids the optical fiber link from becoming a dumb resource that cannot be detected or found, realizes the digital management of each optical fiber link, improves the speed and efficiency of communication system construction, and reduces the difficulty of operation and maintenance.

[0022] In the third aspect, the embodiment of the present application provides a convergence device, including a wavelength division multiplexer, a service optical module and a monitoring module, wherein the service optical module and the monitoring module are respectively connected to the wavelength division multiplexer's wavelength division port, the wavelength division multiplexer's wavelength combination port is connected to one end of the trunk optical fiber, and the other end of the trunk optical fiber is used to connect to the optical terminal device. For the description of the beneficial effects of this aspect, please refer to the second aspect, and the specific details will not be repeated. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A structural example diagram of a communication system provided in an embodiment of the present application;

[0024] Figure 2 This is a diagram showing an example structure of the first embodiment of the optical terminal device provided in this application;

[0025] Figure 3 This is a diagram showing an example structure of the first embodiment of the convergence device provided in this application;

[0026] Figure 4 This is a first example diagram for detecting each channel of echo optical signal;

[0027] Figure 5 A second example diagram for detecting each channel of echo optical signal;

[0028] Figure 6 To remove Figure 2 An example diagram of an optical module in the optical terminal device shown;

[0029] Figure 7 For the general Figure 6 An example diagram showing an optical module connected to an access device;

[0030] Figure 8 for Figure 2 The example diagram of the connection between the optical terminal equipment and the access equipment shown;

[0031] Fig. 9 This is a diagram showing an example of the structure of a second embodiment of the optical terminal device provided in this application;

[0032] Fig.10 This is a diagram showing an example structure of a second embodiment of a convergence device provided in the present application;

[0033] Fig.11 A diagram showing a third embodiment of the optical terminal device provided in this application;

[0034] Fig.12 for Fig.11 An example diagram of the panel structure of the optical terminal equipment shown;

[0035] Fig.13 This is a structural example diagram in which the first optical module has not yet been installed on the optical module fixing seat;

[0036] Fig.14 This is a structural example diagram of a first optical module being installed on an optical module fixing seat. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0038] The embodiment of the present application provides an optical terminal device. The optical terminal device is applied to a communication system, effectively reducing the optical fiber resources required by the communication system, and can detect whether the optical module is in place or out of place. The optical module is in place, which means that the optical module is located inside the optical terminal device. The optical module is out of place, which means that the optical module is detached from the optical terminal device (for example, the optical module is lost). In order to better understand the optical terminal device provided in the embodiment of the present application, combined with Figure 1 As shown, the communication system used by the optical terminal equipment is described. Figure 1 An example structural diagram of a communication system provided in an embodiment of the present application.

[0039] The communication system shown in this embodiment includes a convergence device 100, an optical terminal device, and an access device. Figure 1As shown, the physical area can be divided into multiple areas, for example, area A and area B. For example, area A can be an area where one or more buildings are located. For another example, area A can be an area where a factory is located. This embodiment does not limit the scope and number of divided areas. Taking area A as an example, area A includes J access devices, namely access device 111, and so on to access device 11J, where J is an arbitrary integer not less than 1. The optical terminal device 110 is connected to each access device in area A through a branch optical fiber. Then, the optical terminal device 110 is respectively connected to the access device 111 and the access device 11J. Each access device in area A is connected to one or more terminals. Similarly, area B includes K access devices, namely access device 121, and so on to access device 12K, where K is an arbitrary integer not less than 1. The optical terminal device 120 is connected to each access device in area B through a branch optical fiber. Then, the optical terminal device 120 is respectively connected to the access device 121 and the access device 12K. Each access device in area B is connected to one or more terminals. The optical terminal devices in each area are connected to the aggregation device 100 through the trunk optical fiber, so the optical terminal devices 110 and the optical terminal devices 120 are both connected to the aggregation device 100.

[0040] For example, the aggregation device 100 may be a building base band unit (BBU), and each access device may be a radio remote unit (RRU). For another example, the aggregation device 100 includes a central unit (CU) and a distributed unit (DU). Each access device is an active antenna unit (AAU). For example, if the communication system is a packet transport network (PTN), an internet protocol (IP) network, or an optical transport network (OTN), then the aggregation device 100 is a network core (Provider, P) device, and each access device is a network edge (Provider Edge, PE) device. For another example, the aggregation device 100 is a broadband remote access server (BRAS), and each access device may be an optical line terminal (OLT) or an optical communication system terminal (ONT). For another example, the aggregation device 100 is a core router (CR), and each access device is a switch or a router. This embodiment does not limit the types of the aggregation device 100 and each access device. For example, the aggregation device 100 and each access device may also be a computing server (usually referred to as a server), a high performance computer (HPC), a storage server, or a memory resource pool, etc., as long as the aggregation device 100 and each access device have an electro-optical conversion function and an optical interface that can be connected to an optical fiber. This embodiment does not limit the type of terminal. For example, the terminal may be a computing device, a laptop computer, an optical network unit (ONU), an OTN device, a smart terminal (such as a mobile phone, a wearable device, etc.), an office device (such as a printer, a copier, a scanner, etc.), a smart home device (such as a sweeping robot, a smart light bulb, a smart socket, a smart camera, etc.), a smart TV, or a terminal in a future-evolved public land mobile network (PLMN).

[0041] The following instructions Figure 1 Technical effects of the communication system shown:

[0042] Figure 1In the communication system shown, if an access device needs to be connected to the aggregation device 100, it is not necessary to directly connect the access device to the aggregation device 100 through an optical fiber. Instead, the access device is connected to the optical terminal device in the area through a branch optical fiber, and the purpose of connecting the access device to the aggregation device 100 is achieved through the connected optical terminal device. For example, if the access device 111 needs to be connected to the aggregation device 100, then the access device 111 is directly connected to the optical terminal device 110 in area A through a branch optical fiber. The optical terminal device 110 is connected to the aggregation device 100 through a trunk optical fiber, so the purpose of connecting the access device 111 to the aggregation device 100 is achieved through the optical terminal device 110. Compared with the solution in which each access device is directly connected to the aggregation device 100 through an optical fiber, Figure 1 The communication system shown effectively saves optical fiber resources. For example, the aggregation device is connected to J access devices in area A, and only one optical terminal device 110 needs to be connected through the trunk optical fiber. The aggregation device 100 does not need to be connected to each access device in area A through multiple optical fibers, which effectively saves the optical fiber resources between the aggregation device 100 and the optical terminal device. Because the communication system effectively saves optical fiber resources, the convergence of optical fiber resources is improved, where the convergence of optical fiber resources refers to the process of integrating scattered and inefficient optical fiber resources to achieve efficient utilization. Improve the convergence of optical fiber resources, and then effectively improve the utilization rate of optical fiber resources. Then, the optical terminal device 110 in area A is used as the anchor point for service deployment to achieve batch coverage of each access device in area A, so as to ensure that each access device is connected to the aggregation device 100 through the optical terminal device 110, so as to ensure that the aggregation device 100 and each access device in area A can achieve service intercommunication.

[0043] Figure 1The communication system shown can also achieve pre-deployment. With the wide application of services, new services need to be opened continuously. For example, in area A, new access devices will be added at any time as needed to realize the opening of new services. Pre-deployment means that an optical terminal 110 is set in area A. If a new access device needs to be added in area A later, the newly added access device is directly connected to the optical terminal device 110 through a branch optical fiber, so that the newly added access device can be connected to the aggregation device 100 to realize the intercommunication of new services. Moreover, when adding a new access device in the area, since it is not necessary to directly connect the access device to the aggregation device through an optical fiber, then for the newly added access device, there is no need to find an independent optical fiber connected between the aggregation device and the access device. It can be understood that because the communication system can achieve pre-deployment, the optical terminal device does not need to be configured according to the access device, but is configured according to the area to realize pre-deployment of each area. It effectively reduces the time required for the newly added access device to connect to the aggregation device 100 to open the service, and improves the efficiency of service opening.

[0044] based on Figure 1 The communication system shown below is combined with Figure 2 The figure shows the structure of the optical terminal device provided in the embodiment of the present application. Figure 2 This is a diagram showing an example of the structure of the first embodiment of the optical terminal device provided in the present application. The optical terminal device shown in this embodiment includes a fixed frame, a wavelength division multiplexer (WDM) 201, and M first optical modules, where M is an arbitrary integer not less than 1, and this embodiment does not limit the specific value of M. This embodiment takes each first optical module as a color optical module as an example, wherein the color optical module may also be referred to as a color optical module or a wavelength division optical module. Different color optical modules emit optical signals with different central wavelengths, and can be multiplexed in a trunk optical fiber for transmission, thereby reducing the cost of the link.

[0045] The structure of the fixed frame is described. The fixed frame specifically includes a WDM fixing seat 200 and an optical module fixing seat 210. The WDM fixing seat 200 is used to install WDM201, and M first optical modules are detachably mounted on the optical module fixing seat 210. Among them, the first optical module can be detachably mounted on the optical module fixing seat 210, which means that the first optical module can be installed on the optical module fixing seat 210 at any time as needed, or the first optical module can be taken out from the optical module fixing seat 210, so that the first optical module and the optical module fixing seat 210 are separated from each other. This embodiment does not limit the structure of the optical module fixing seat 210, as long as the M first optical modules can be detachably mounted on the optical module fixing seat 210. This embodiment does not limit the relationship between the optical module fixing seat 210 and the WDM fixing seat 200. For example, the optical module fixing seat 210 is connected to the WDM fixing seat 200. For another example, the optical module fixing seat 210 and the WDM fixing seat 200 are respectively inserted at different positions of the fixed frame. This embodiment does not limit the positional relationship between the optical module fixing seat 210 and the WDM fixing seat 200, as long as the WDM fixing seat 200 does not cause interference with the operation when the first optical module is inserted into the optical module fixing seat 210 or the first optical module is removed from the optical module fixing seat 210. This embodiment does not limit the specific method of installing WDM201 in the WDM fixing seat 200. For example, the WDM fixing seat 200 has a storage space inside, and the storage space is used to accommodate WDM201. For another example, the WDM fixing seat 200 has a slot, and WDM201 is inserted into the slot through the socket of the slot. The WDM201 shown in this embodiment is a device that can decompose one multiplexed optical signal into multiple optical signals with different wavelengths. WDM201 may include multiple optical filters, each of which can pass a specific wavelength, so as to achieve the purpose of WDM201 decomposing the multiplexed optical signal into multiple optical signals with different wavelengths.

[0046] The connection method between WDM201 and the aggregation device is described. WDM201 includes a multiplexing port 221. The WDM fixing seat 200 includes a trunk port 202, and the multiplexing port 221 of WDM201 is connected to the trunk port 202 through an optical fiber. The trunk port 202 is used to connect to the trunk optical fiber 203, and the trunk optical fiber 203 is used to connect to the aggregation device. It can be understood that one end of the trunk optical fiber 203 is connected to the aggregation device, and the other end of the trunk optical fiber 203 is connected to the trunk port 202. For a description of the aggregation device, please refer to Figure 1 The corresponding description is not repeated in detail. The WDM 201 receives an optical signal from a convergence device via the trunk optical fiber 203 , or the WDM 201 sends an optical signal to a convergence device via the trunk optical fiber 203 .

[0047] The connection method between WDM201 and the first optical module is described. WDM201 includes M first demultiplexing ports, each of which is used to emit the optical signal after WDM demultiplexing. For example, WDM201 includes a first demultiplexing port 231, a first demultiplexing port 232 to a first demultiplexing port 23M. The WDM fixing seat 200 includes M first branch ports, for example, a first branch port 241, a first branch port 242 to a first branch port 24M. The first demultiplexing port 231 and the first branch port 241, the first demultiplexing port 232 and the first branch port 242, and the first demultiplexing port 23M and the first branch port 24M are all connected by optical fibers. The optical terminal device also includes M first branch optical fibers, for example, a first branch optical fiber L1, a first branch optical fiber L2 to a first branch optical fiber LM. One end of the first branch optical fiber L1 is connected to the first branch port 241, and the other end of the first branch optical fiber L1 is connected to the first optical module 251. One end of the first branch optical fiber L2 is connected to the first branch port 242, and the other end of the first branch optical fiber L2 is connected to the first optical module 252. One end of the first branch optical fiber LM is connected to the first branch port 24M, and the other end of the first branch optical fiber LM is connected to the first optical module 25M. In this embodiment, the number of first split-wavelength ports, the number of first branch ports, the number of first branch optical fibers, and the number of first optical modules are all M as an example, without limitation, as long as each first optical module can be connected to WDM201 through one branch optical fiber, one branch port, and one split-wavelength port.

[0048] Optionally, the WDM201 shown in this embodiment also includes a second split wave port 261, and the WDM fixing seat 200 also includes a second branch port 262, and the second split wave port 261 is connected to the second branch port 262 through an optical fiber. This embodiment does not limit the number of second split wave ports 261 and second branch ports 262. The second branch port 262 is connected to one end of a second branch optical fiber LP, and the other end of the second branch optical fiber LP is suspended. By comparing the first branch optical fiber L1 and the second branch optical fiber LP, it can be seen that the other end of the second branch optical fiber LP is suspended, which means that the other end of the second branch optical fiber LP is not connected to the optical module.

[0049] The optical terminal device shown in this embodiment can implement a pre-deployment detection event. Based on the pre-deployment detection event, it can detect whether each optical module on the optical terminal device is in place during the pre-deployment stage. In the pre-deployment stage, the optical terminal device is only installed in the corresponding area, and the optical terminal device has not yet been connected to the terminal device. For example, Figure 1In the corresponding example, the optical terminal device 110 is installed in area A. In the pre-deployment stage, the access device has not yet been connected to the optical terminal device. Therefore, based on the pre-deployment detection event, the aggregation device 100 can detect whether each optical module on the optical terminal 110 is in place or out of place.

[0050] Combination Figure 3 The figure illustrates the structure of the aggregation device for implementing the pre-deployment detection event. Figure 3 The first embodiment of the convergence device provided in the present application is shown in the structural example diagram. The convergence device 300 shown in this embodiment specifically includes a detection module 311, multiple service optical modules and WDM310. The detection module 311 shown in this embodiment can be an optical time domain reflectometer (OTDR). The convergence device 300 specifically includes a service optical module 301, a service optical module 302, and a service optical module 303 to a service optical module 304. The combining port 321 of WDM301 is connected to the trunk optical fiber 203. The convergence device 300 is connected to the trunk optical fiber 203 through the trunk optical fiber 203. Figure 2The optical terminal device shown. WDM310 also includes multiple splitter ports, and each service optical module and detection module 311 are connected to the splitter port of WDM310 through optical fiber. For example, the service optical module 301 is connected to the splitter port 322 of WDM310 through optical fiber. Among them, the aggregation device 300 specifically includes a device board, and the device board includes a processor 312, and the processor 312 is respectively connected to each service optical module and the detection module 311. This embodiment does not limit the type of the processor 312. For example, the processor 312 may include one or more chips, or one or more integrated circuits. For example, the processor may include one or more neural processing units (NPUs), optical digital signal processors (oDSPs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), system on chips (SoCs), central processor units (CPUs), network processors (NPs), microcontroller units (MCUs), programmable logic devices (PLDs), network card chips, storage interface chips, or other integrated chips. The details are not repeated here.

[0051] In the pre-deployment stage, based on the pre-deployment detection event, it is possible to detect whether each optical module on the optical terminal device is in place. To this end, the detection module 311 can pre-store a first detection list as shown in Table 1.

[0052] Table 1

[0053] wavelength Identification of branch optical fibers Optical module identification λa1 L1 251 λa2 L2 252 λa3 LM 25M …… …… …… λaP LP 25P

[0054] In the first detection list shown in Table 1, the correspondence between different branch fiber identifiers, optical module identifiers and wavelengths on the optical terminal device is created. The optical modules shown in Table 1 have been pre-installed on the optical terminal device. Based on the pre-deployment detection events, it is possible to detect whether the optical modules shown in Table 1 are lost, detached from the optical terminal device, etc. For example, based on the first detection list shown in Table 1, it is possible to detect whether the optical module with identifier 251 is in place. Among them, the optical module with identifier 251 is in place, which means that the optical module with identifier 251 is in a connected state with the branch optical fiber with identifier L1 in the optical terminal device. The optical module with identifier 251 is not in place (i.e., in a detached state), which means that one end of the branch optical fiber with identifier L1 is in a suspended state, i.e., the end of the branch optical fiber L1 is not connected to the optical module. This indicates that the optical module with identifier 251 is lost. If you want to detect whether the optical module with identification 251 is in the in-place state, then, on the aggregation device side, the detection module 311 sends a detection optical signal with a wavelength of λa1 to the optical terminal device through WDM310. This detection optical signal is referred to as the detection optical signal λa1 below. By analogy, if you want to detect whether the optical module with identification 25P is in the in-place state, then the detection module 311 sends a detection optical signal with a wavelength of λaP to the optical terminal device through WDM310. This detection optical signal is referred to as the detection optical signal λaP below. WDM310 multiplexes the detection optical signal λa1 to the detection optical signal λaP to obtain a multiplexed optical signal. WDM310 sends the multiplexed optical signal to the optical terminal device through the trunk optical fiber 203. This embodiment takes the detection module 311 sending multiple detection optical signals to WDM310 as an example. In other examples, the detection module 311 may also send each detection optical signal to the WDM 310 in a time-division manner, and the WDM 310 sends each detection optical signal in sequence to the optical terminal device through the trunk optical fiber 203 .

[0055] The WDM201 of the optical terminal equipment receives the multiplexed optical signal through the trunk optical fiber 203. The WDM201 decomposes the multiplexed optical signal to obtain the detection optical signal λa1, the detection optical signal λa2 to the detection optical signal λaP. Taking the detection optical signal λa1 as an example, the WDM201 transmits the detection optical signal λa1 to the first demultiplexing port 231, and transmits it to the first optical module 251 via the first branch optical fiber L1. The first optical module 251 shown in this embodiment is installed on the optical module fixing seat 210. The first optical module 251 is connected to the WDM210 via the first branch optical fiber L1. The detection optical signal λa1 decomposed by the WDM201 is transmitted to the first optical module 251 via the first demultiplexing port 231, the first branch port 241 and the first branch optical fiber L1 in sequence. After receiving the detection optical signal λa1, the first optical module 251 will reflect the echo optical signal λa1. The echo optical signal λa1 is reflected to the convergence device 300 via the first branch optical fiber L1, the first branch port 241, the first split wave port 231, the WDM201 and the trunk optical fiber 203. The WDM310 of the convergence device 300 reflects the echo optical signal λa1 to the detection module 311. By analogy, the WDM201 at the optical terminal device transmits the detection optical signal λaP to the second branch optical fiber LP via the second split wave port 261 and the second branch port 262 in sequence. The end of the second branch optical fiber LP is suspended in the air, and then the end of the second optical fiber LP reflects the echo optical signal λaP. The echo optical signal λaP is reflected to the convergence device 300 via the second branch optical fiber LP, the second branch port 262, the second split wave port 261, the WDM201 and the trunk optical fiber 203. The WDM310 of the convergence device 300 reflects the echo optical signal λaP to the detection module 311.

[0056] The detection module 311 can obtain the following information based on the echo optical signals: Figure 4 An example of detection is shown in the figure. Figure 4 This is a first example diagram for detecting each channel of echo optical signal. Figure 4In the example diagram shown, the horizontal axis is the echo optical signal of each path, and the vertical axis is the amplitude of each received echo optical signal. After the detection module 311 receives the echo optical signal of each path, it obtains the amplitude of each echo optical signal. For example, after the detection module 311 receives the echo optical signal λa1, it obtains the amplitude of the echo optical signal λa1, in decibels (dB). After the detection module 311 obtains the echo optical signal λa2, it obtains the amplitude of the echo optical signal λa2, and so on. After the detection module 311 obtains the echo optical signal λaP, it obtains the amplitude of the echo optical signal λaP. The detection module 311 shown in this embodiment can specifically determine which optical signal is the echo optical signal λa1 from multiple echo optical signals according to the time when each echo optical signal is received, and so on. For another example, the detection module 311 includes a wavelength detection device, and the detection module 311 determines which optical signal is the echo optical signal λa1 from multiple echo optical signals based on the wavelength of each echo optical signal, and so on. It should be noted that this embodiment does not limit the manner in which the detection module 311 determines each echo optical signal.

[0057] Taking the echo optical signal λa1 and the echo optical signal λaP as examples, since the end of the first branch optical fiber L1 that reflects the echo optical signal λa1 is connected to the first optical module 251, and since the first optical module 251 is an optical device that realizes the photoelectric conversion function, when the first optical module 251 receives the detection optical signal λa1, it will absorb a part of the detection optical signal λa1 and then reflect the remaining detection optical signal λa1. Then, the amplitude of the echo optical signal λa1 reflected by the first optical module 251 to the convergence device is A401. Since the end of the second branch optical fiber LP that reflects the echo optical signal λaP is not connected to the optical module. Then, the echo optical signal λaP is reflected by the end of the second branch optical fiber LP to the convergence device. Since the end of the second branch optical fiber LP is not connected to the optical module, the amplitude of the echo optical signal λaP reflected by the end of the second branch optical fiber LP to the convergence device is A402. The end of the second branch optical fiber LP is exposed to the air, resulting in the absorption degree of the detection optical signal by the end of the second branch optical fiber LP being weaker than the absorption degree of the detection optical signal by the first optical module 251. Then, the amplitude A402 detected by the detection module 311 is greater than the amplitude A401. Therefore, based on the amplitude A401, the detection module 311 detects that the first optical module 251 corresponding to the echo optical signal λa1 is in the in-place state. It is also possible to detect that the optical module 25P corresponding to the echo optical signal λaP is not in the in-place state based on the amplitude A402, that is, the second branch optical fiber LP is not connected to the optical module. Then, the optical module marked as 25P is in a state of being lost or detached from the optical terminal device.

[0058] Then, the detection module 311 can be based on Figure 4The echo optical signals of each path are shown to obtain a first result list such as shown in Table 2:

[0059] Table 2

[0060] Optical module identification Identification of branch optical fibers In-position status 251 L1 reign 252 L2 reign …… …… 25P LP Breakaway

[0061] The aggregation device can display the first result list as shown in Table 2. For another example, the aggregation device sends the first result list shown in Table 2 to the terminal device (such as a mobile phone, laptop computer, etc.) held by the operation and maintenance personnel, and the display screen of the terminal device displays the first result list as shown in Table 2. The first result list includes the correspondence between the optical module identification, the in-place status, and the branch optical fiber identification. Then, based on what is shown in Table 2, the operation and maintenance personnel can directly obtain which optical modules are in-place and which optical modules are in a disconnected state in the optical terminal device without having to go to the site where the optical terminal device is located. It is also possible to directly obtain the identification of the branch optical fiber that is disconnected from the optical module. For example, if the optical module with identification 25P is in a disconnected state, then the corresponding second branch optical fiber with identification LP is not connected to the optical module.

[0062] The detection module shown in this embodiment is an OTDR, so the detection module can measure the quality parameters of the optical fiber link according to the intensity of each echo optical signal reflection, the change of each echo optical signal reflection intensity, etc. The quality parameters include but are not limited to the insertion loss, attenuation, transmission performance, etc. of the optical fiber link, so as to facilitate fault detection and maintenance of each optical fiber link according to the quality parameters. Taking the echo optical signal λa1 as an example, the optical fiber link FL1 measured by the echo optical signal λa1 is the optical path between the detection module 311 and the first optical module 251, and the optical path specifically includes the optical fiber between the detection module 311 and the WDM310, the trunk optical fiber 203, the optical fiber between the trunk port 202 and the WDM201, the optical fiber between the first splitter port 231 and the first branch port 241, and the first branch optical fiber L1. It can be understood that the first optical module 251 can receive the detection optical signal λa1 from the detection module 311 via the optical fiber link FL1, and transmit the echo optical signal λa1 to the detection module 311 via the optical fiber link FL1. By analogy, the optical fiber link FLP measured by the detection module 311 through the echo optical signal λaP is the optical path between the detection module 311 and the second branch optical fiber LP. For the description of the optical fiber link LP, please refer to the description of the optical fiber link L1, and the details are not repeated here. It can be understood that the second branch optical fiber LP can receive the detection optical signal λaP from the detection module 311 via the optical fiber link FLP. And transmit the echo optical signal λaP to the detection module 311 via the optical fiber link FLP.

[0063] Then, the detection module can obtain the second result list as shown in Table 3:

[0064] Table 3

[0065] Optical module identification Identification of branch optical fibers In-position status Fiber optic link quality parameters 251 L1 reign Quality parameters of optical fiber link FL1 252 L2 reign Quality parameters of optical fiber link FL2 …… …… 25P LP Breakaway Quality parameters of optical fiber link FLP

[0066] For instructions on how the operation and maintenance personnel obtain the second result list shown in Table 3, please refer to the instructions on how the operation and maintenance personnel obtain the first result list shown in Table 2, and the details are not repeated here. The second result list includes the correspondence between the optical module identification, the in-place status, the branch optical fiber identification, and the optical fiber link quality parameters in which the optical module is located. For example, taking the first optical module with identification 251 as an example, based on the second result list shown in Table 3, it can be detected that the first optical module 251 is in the in-place state, and the quality parameters of the optical fiber link FL1 can be obtained. Then, based on what is shown in Table 3, the operation and maintenance personnel can directly obtain which optical modules are in the in-place state and which optical modules are in the disengaged state in the optical terminal device without going to the site where the optical terminal device is located. Moreover, it is also possible to determine the quality parameters of the optical fiber link between the convergence device and the optical terminal device, so as to facilitate operation and maintenance, fault identification, troubleshooting and other operation and maintenance operations for each optical fiber link.

[0067] Optionally, each first optical module shown in this embodiment includes a reflective film, which is located on the transmission optical path of the detection optical signal. After receiving the detection optical signal, the reflective film will reflect the echo optical signal with a higher reflectivity. The reflective film is usually composed of a metal film or a dielectric film with a high reflectivity. This embodiment does not limit the specific material of the reflective film. As long as the reflective film receives the detection optical signal, it can reflect the echo optical signal with a higher reflectivity. This embodiment does not limit the position of the reflective film in the first optical module. For example, the first optical module includes an optical receiver assembly (receiveroptical subassembly, ROSA). The ROSA is used to receive the optical signal and perform photoelectric conversion on the optical signal. The ROSA includes a reflective film so that when the ROSA receives the optical signal, the reflective film is located on the transmission optical path of the detection optical signal. For example, the reflective film is located at the position where the ROSA is connected to the first branch optical fiber.

[0068] Figure 5 This is a second example diagram for detecting each channel of echo optical signal. Figure 5 For an explanation of the coordinates shown, see Figure 4 As shown, the details are not repeated here. After the detection module 311 receives the echo light signals of each path, it obtains the amplitude of each echo light signal. For example, after the detection module 311 receives the echo light signal λa1, it obtains the amplitude A501 of the echo light signal λa1. By analogy, after the detection module 311 obtains the echo light signal λaP, it obtains the amplitude A402 of the echo light signal λaP. For the description of how the detection module 311 obtains the amplitude of each echo light signal, please refer to Figure 4 The corresponding instructions are not detailed here. Figure 4 as well as Figure 5 As shown, for the echo optical signal λa1, Figure 4 In the illustrated embodiment, the amplitude of the echo optical signal λa1 is A401. Figure 5 In the embodiment shown, the amplitude of the echo optical signal λa1 is A501. Since the first optical module 251 includes a reflective film, the amplitude A501 of the echo optical signal λa1 emitted by the first optical module 251 is greater than the amplitude A402 of the echo optical signal λaP reflected by the second branch optical fiber LP.

[0069] The above example uses the installation of the detection module 311 on the device single board of the convergence device as an example. In other examples, the detection module 311 may also be a device independent of the convergence device. Then, when it is necessary to detect whether each optical module of the optical terminal device is in the in-place state, the detection module 311 is connected to the WDM310 of the convergence device. This embodiment does not limit the specific manner in which the detection module 311 sends the detection optical signal to the optical terminal device. For example, the detection module 311 may continuously send each channel of detection optical signals to the optical terminal device, so that the detection module 311 detects in real time whether each optical module of the optical terminal device is in the in-place state. For another example, the detection module 311 may periodically send each channel of detection optical signals to the optical terminal device, so that the detection module 311 can periodically detect whether each optical module of the optical terminal device is in the in-place state. For another example, the detection module 311 may detect whether a specific optical module is in the in-place state, such as detecting whether the first optical module 251 is in the in-place state alone, etc., which is not specifically limited.

[0070] By using the optical terminal device shown in this embodiment, it is not necessary to power the optical terminal device during the process of detecting whether each optical module on the optical terminal device is in the in-place state. The optical terminal device can detect whether each optical module of the optical terminal device is in the in-place state in real time or periodically during the pre-deployment stage. Then, whether the optical module of the optical terminal device is in the in-place state or in the disengaged state can be detected by the convergence device. The detection of whether the optical module of the optical terminal device is in the in-place state does not require the operation and maintenance personnel to go to the optical terminal device for manual inspection, which improves the efficiency and accuracy of the detection. Moreover, if the optical module in the optical terminal device changes from the in-place state to the disengaged state, the convergence device can quickly locate the optical module in the disengaged state based on the echo optical signal, which improves the efficiency of detecting the change of the optical module state. If the optical module of the optical terminal device is lost, it can be discovered in time. The convergence device can display whether each optical module of the optical terminal device is in the in-place state by displaying the result list shown above, which improves the efficiency of the operation and maintenance personnel in obtaining the various states of the optical terminal device. In the pre-deployment stage, the optical terminal device 110 is set in area A. Then, when a new access device is added in area A later, the optical module in the in-place state can be connected to the access device, so as to realize the intercommunication of services between the aggregation device and the newly added access device, and improve the speed of opening services. The operation and maintenance personnel can realize the visual and manageable status of each optical module of the optical terminal device on the aggregation device side, and improve the operation and maintenance efficiency. The aggregation device can also detect the quality parameters of each optical fiber link between the aggregation device and the optical terminal device, so as to facilitate the operation and maintenance of each optical fiber link, fault identification, troubleshooting and other operation and maintenance operations. The aggregation device can also detect the on-off of each optical fiber link. For example, if it is detected that the optical module 251 is in the in-place state, it means that the optical fiber link FL1 between the aggregation device and the optical module 251 is in the on state. Then, based on the detection of each optical fiber link, the aggregation device effectively avoids the optical fiber link from becoming a dumb resource that cannot be detected or found, realizes the digital management of each optical fiber link, improves the speed and efficiency of the communication system construction, and reduces the difficulty of operation and maintenance.

[0071] The optical terminal equipment can switch from the pre-deployment stage to the service activation stage. The service activation stage refers to the transmission of services between the convergence equipment and the optical terminal equipment. Figure 1 As shown, after the optical terminal device 110 is pre-deployed, the optical terminal device 110, as the anchor point for service deployment, needs to be deployed in each access device in area A. Instead of directly connecting to the aggregation device, the optical terminal device 110 is directly connected to realize the intercommunication of services between the aggregation device 100 and the access device 111. In the service activation stage, it is also possible to detect whether the optical module is in an online state. The specific detection methods include online detection and offline detection:

[0072] First, the offline detection method is described:

[0073] Figure 6 To remove Figure 2 An example diagram of an optical module in an optical terminal device is shown. Figure 7 For the general Figure 6 The example diagram of the optical module connected to the access device is shown. Figure 2 , Figure 6 as well as Figure 7 As shown, in order to achieve the purpose of connecting the access device 220 to the optical terminal device, three actions are required:

[0074] Action 1: Take out at least one optical module installed in the optical terminal device from the optical module fixing seat 210. For example, in this example, the first optical module 25M installed in the optical module fixing seat 210 is taken out from the optical module fixing seat 210. In this embodiment, in order to distinguish the position state of the optical module in the optical module fixing seat 210 and the position state of the optical module taken out from the optical module fixing seat 210, the first optical module 25M taken out from the optical module fixing seat 210 is changed to the second optical module 25M, and when the branch optical fiber is connected to the first optical module 25M, it is called the second branch optical fiber LM, and when the branch optical fiber is connected to the second optical module 25M, it is called the third branch optical fiber LM.

[0075] Action 2: Connect the second optical module 25M to the optical interface of the access device 220. The optical interface of the access device 220 is used to connect the optical module to achieve the conduction of the optical signal between the access device 220 and the convergence device.

[0076] Action three, keep one end of the third branch optical fiber LM connected to the second optical module 25M, but switch the third branch optical fiber LM from a state connected to the first branch port 24M to a state connected to the third branch port 602. Since the third branch port 602 is connected to the third wavelength division port 601 of WDM201 through an optical fiber, then when one end of the third branch optical fiber LM is connected to the second optical module 25M and the other end is connected to the third branch port 602, a connection between the access device 220 and WDM201 is established.

[0077] It can be understood that, through actions 1 to 3, the connection between the access device 220 and the second optical module 25M is realized. Then, if the aggregation device needs to send a service to the access device 220, combined with Figure 3 as well as Figure 7 As shown, the processor 312 pre-stores a service list as shown in Table 4:

[0078] Table 4

[0079] Service optical module identification Optical module identification of optical terminal equipment Wavelength of the service optical module 301 251 λb1 302 252 λb2 303 25M λbM 304 25P λbP …… …… ……

[0080] As shown in the service list in Table 4, the identification of different service optical modules on the aggregation device side, the wavelength of the service optical module, and the correspondence between the optical module identification of the optical terminal device are created. The service optical module shown in this embodiment is a color optical module. For the description of the color optical module, please refer to the description of the first optical module as a color optical module, and the specific details are not repeated. As shown in Table 4, since the second optical module 25M has been connected to the access device 220, the aggregation device can send downlink services to the second optical module 25M, and the second optical module 25M can also send uplink services to the aggregation device, so that the aggregation device and the access device 220 can achieve service interoperability. Specifically, if it is necessary to send a downlink service to the second optical module 25M, then the processor 312 at the aggregation device obtains the service optical module with identification 303 corresponding to the second optical module 25M according to Table 4. To this end, the processor 312 of the aggregation device sends a downlink service to the service optical module 303. The service optical module 303 modulates the downlink service to obtain a service optical signal, and the wavelength of the service optical signal is λbM, and sends the service optical signal to WDM310. WDM310 sends the service optical signal to the optical terminal device through the trunk optical fiber 203. Because the wavelength of the service optical signal is λbM, after the WDM201 of the optical terminal device receives the service optical signal, it can send the service optical signal to the third splitter port 601, and emit it from the third branch port 602 to send it to the second optical module 25M via the third branch optical fiber LM. It can be understood that the branch port connected to the switching branch optical fiber shown in this embodiment is to ensure that the second optical module can successfully receive the service optical signal from the convergence device. The second optical module 25M demodulates the service optical signal to obtain the downlink service, and sends the downlink service to the processor of the access device 220. The access device 220 may also send an uplink service to the aggregation device. For a description of the process of the access device 220 sending an uplink service to the aggregation device, please refer to the description of the aggregation device sending a downlink service to the access device 220, which will not be described in detail.

[0081] For the second optical module 25M that has been inserted into the access device 220, the aggregation device can detect whether the second optical module is in a state of connection with the access device by means of in-band detection. For example, the service optical signal sent by the second optical module 25M to the aggregation device includes multiple transmission frames, and the indication message can be carried through the overhead of the transmission frame. The indication message can be used to indicate the in-place status of the second optical module 25M. This example does not limit the specific content carried by the indication message. The indication message can carry a message used to indicate that the second optical module 25M is connected to the access device 220. For another example, the indication message can also carry the wavelength that the second optical module 25M can emit, the wavelength that it can receive, the emitted optical power, monitoring information, alarm information, etc., without specific limitation. For instructions on how the aggregation device detects whether each first optical module is in-place, please refer to Figures 2 to 5 The corresponding instructions are not elaborated in detail.

[0082] Let me explain the online detection method:

[0083] In the above offline detection method, if the second optical module needs to be connected to the access device, then the branch optical fiber connected to the second optical module needs to be switched, and the connection relationship between the branch optical fiber connected to the second optical module and the branch port and the WDM splitter port needs to be switched. However, during the online detection process, there is no need to switch the connection relationship between the branch optical fiber connected to the second optical module and the branch port and the WDM splitter port. Figure 8 for Figure 2 The second optical module 25M taken out from the optical module fixing seat 210, for the description of the second optical module 25M, see Figure 6 The second branch optical fiber connected to the second optical module 25M does not need to change the connection relationship with the branch port, but directly connects the second optical module 25M to the access device 220. Then, the detection module of the convergence device sends a detection optical signal to the second optical module 25M, and determines whether the second optical module is in a state of being connected to the branch optical fiber according to the amplitude of the echo optical signal reflected by the second optical module 25M. For the description of the detection, please refer to Figure 4 as well as Figure 5 The details are not described in detail.

[0084] In the above embodiment, it is possible to detect whether the first optical module is in place, and the present embodiment is also capable of detecting whether the optical terminal device is in place. The optical terminal device being in place means that the optical terminal device is connected to the trunk optical fiber 203. Then, when the access device is connected to the optical terminal device in place, the access device can be connected to the convergence device. In order to realize the detection of whether the optical terminal device is in place, the optical terminal device includes a reflective film. The present embodiment does not limit the position of the reflective film in the optical terminal device, as long as the reflective film is located on the transmission optical path of the detection optical signal. For example, the reflective film is located at any of the following positions:

[0085] On the combining port 221 of WDM201, on a demultiplexing port of WDM201, inside WDM201, between the combining port 221 and the trunk port 202, between the demultiplexing port and the branch port, in the trunk optical fiber 203, in a branch optical fiber connected to WDM201, and an optical module fixed on the optical module fixing seat 210. After the reflective film receives the detection optical signal, for example, the wavelength is λc. The reflective film reflects the echo optical signal λc to the convergence device, and the convergence device detects whether the optical terminal device is in the in-place state or in the offline state (that is, the optical terminal device is not connected to the trunk optical fiber) based on the amplitude of the echo optical signal λc. For instructions on how the convergence device detects whether the optical terminal device is in the in-place state based on the reflective film, please refer to Figure 4 or Figure 5 As shown, the details are not repeated here.

[0086] The optical terminal equipment shown in this embodiment can also implement protection switching. Fig. 9 This is a diagram showing an example structure of the second embodiment of the optical terminal device provided in this application. Fig. 9 The optical terminal device shown includes a WDM fixing seat 900, an optical module fixing seat 210, a WDM201 and M first optical modules. For details, see Figure 2 The corresponding instructions are not elaborated in detail. Fig. 9 The optical terminal equipment shown is relative to Figure 2The difference between the optical terminal equipment shown in the embodiment is that the optical terminal equipment shown in this embodiment also includes an optical coupler 901. The optical coupler 901 is connected to the multiplexing port 911 of WDM201. The WDM fixing frame 900 includes a first trunk port 903 and a second trunk port 904, and the optical coupler 901 is connected to the first trunk port 903 and the second trunk port 904 through optical fibers. The first trunk port 903 is connected to the first trunk optical fiber 902, and the second trunk port 904 is connected to the second trunk optical fiber 905. The function of the optical coupler 901 is to conduct the optical path between the first trunk optical fiber 902 and WDM201, and to conduct the optical path between the second trunk optical fiber 905 and WDM201. This embodiment does not limit the specific structure of the optical coupler 901, as long as the optical coupler 901 can achieve the conduction of the optical path. This embodiment does not limit the type of the optical coupler 901. For example, the type of the optical coupler 901 may be a directional coupler (DC) or a multimode interference coupler (MMI coupler).

[0087] Combination Fig.10 The structure of the convergence device for implementing protection switching is shown in FIG. Fig.10 This is a diagram showing a second embodiment of the structure of the convergence device provided in this application. The convergence device shown in this embodiment includes a processor 312, multiple service optical modules, a detection module 311 and WDM1001. For details, see Figure 3 The corresponding description is not repeated here. Figure 3 The difference shown is that the convergence device further includes an optical switch 1002, which is connected to the WDM 1001. The optical switch 1002 is also connected to the first trunk optical fiber 902 and the second trunk optical fiber 905 respectively. The optical switch 1002 of the convergence device may include one or more optical couplers. For an explanation of the types of optical couplers, see Fig. 9 The description of the optical coupler 901 of the corresponding optical terminal device is not repeated in detail. The optical switch 1002 of the convergence device can also be implemented by a Mach-Zehnder interferometer (MZI), a microelectro mechanical system (MEMS), a liquid crystal optical switch or a holographic grating switch, etc., without specific limitation. The function of the optical switch 1002 is to conduct the optical path between the first trunk optical fiber 902 and the WDM1001, or to conduct the optical path between the second trunk optical fiber 905 and the WDM1001.

[0088] The following describes the process of protection switching between the convergence device and the optical terminal device. At the convergence device, if it is determined that the optical fiber link of the first trunk optical fiber 902 is in a normal state, the optical switch 1002 at the convergence device conducts the optical path between the first trunk optical fiber 902 and WDM1001. The optical coupler 901 at the optical terminal device has conducted the optical path between the first trunk optical fiber 902 and WDM201, and between the second trunk optical fiber 905 and WDM201. Then, the convergence device and the optical terminal device realize the intercommunication of services through the first trunk optical fiber 902. If it is determined that the optical fiber link of the first trunk optical fiber 902 is in an abnormal state at the convergence device, the optical switch 1002 at the convergence device conducts the optical path between the second trunk optical fiber 905 and WDM1001. The optical coupler 901 at the optical terminal device has conducted the optical path between the first trunk optical fiber 902 and WDM201, and between the second trunk optical fiber 905 and WDM201. Then, the convergence device and the optical terminal device realize the intercommunication of services through the second trunk optical fiber 905. Among them, the abnormality of the first trunk optical fiber 902 refers to that the first trunk optical fiber 902 is damaged, the light attenuation (also known as the energy attenuation of the light quantum) of the first trunk optical fiber 902 is too large, the first trunk optical fiber 902 is excessively bent, the first optical fiber connector is damaged, the connection between the first optical fiber connector and the first optical fiber adapter is poorly contacted, the second optical fiber connector is damaged, and the connection between the second optical fiber connector and the second optical fiber adapter is poorly contacted. Among them, the two ends of the first trunk optical fiber 902 are respectively connected to the first optical fiber connector and the second optical fiber connector. The first optical fiber connector is connected to the first optical fiber adapter at the convergence device. The second optical fiber connector is connected to the second optical fiber adapter at the optical terminal device. The description of the abnormality of the first trunk optical fiber 902 in this embodiment is an optional example and is not limited. As long as the first trunk optical fiber 902 is abnormal, it will cause the service transmitted via the first trunk optical fiber 902 to be interrupted, the bit error rate is too high, the packet loss rate is too high, etc. For the description of the abnormality of the second trunk optical fiber 905, please refer to the description of the abnormality of the first trunk optical fiber 902, and the details are not repeated here.

[0089] Fig.11 The optical terminal device shown in this embodiment includes a WDM fixing seat 200, an optical module fixing seat 210, a WDM201 and M first optical modules. For details, please refer to Fig. 9The corresponding description is not described in detail. The optical terminal device shown in this embodiment also includes an outer shell 1100. The outer shell 1100 accommodates the fixing frame. This embodiment does not limit the specific material of the outer shell 1100. For example, the outer shell 1100 can be made of plastic or metal. Specifically, the outer shell 1100 has a closed structure, and the closed structure accommodates the WDM fixing seat 200 so that the WDM fixing seat 200 is located inside the outer shell 1100. Then, due to the protective effect of the outer shell 1100 on the WDM201, the outer shell 1100 can provide dustproof and waterproof protection for the WDM201. The first branch optical fiber and the second branch optical fiber connected to the WDM fixing seat 200 both extend in the space between the WDM fixing seat 200 and the outer shell 1100, so that one end of the first branch optical fiber is connected to the first branch port on the WDM fixing seat 200, and the other end is connected to the first optical module. For the description of the first branch optical fiber and the second branch optical fiber, please refer to Figure 2 The corresponding description is not repeated in detail. Because the first branch optical fiber and the second branch optical fiber extend in the space between the WDM fixing seat 200 and the outer shell 1100, the outer shell 1100 can protect the first branch optical fiber and the second branch optical fiber, that is, the outer shell 1100 can protect the first branch optical fiber and the second branch optical fiber from dust and water, effectively improving the reliability of the first branch optical fiber and the second branch optical fiber and the service life of the branch optical fiber. The outer shell 1100 shown in this embodiment is installed in an area (for example Figure 1 As shown in area A), this embodiment does not limit the specific installation method. For example, the outer shell 1100 can be installed in a cabinet, mounted on a wall, or installed on a desktop.

[0090] Combination Fig.11 as well as Fig.12 As shown, Fig.12 for Fig.11 The panel structure example diagram of the optical terminal device shown in the figure. The outer shell 1100 shown in this embodiment includes a panel 1200. The panel 1200 is a side surface of the outer shell 1100. The panel 1200 includes multiple fiber outlets. The multiple fiber outlets may include a first trunk fiber outlet 1201 and a second trunk fiber outlet 1202, wherein a first trunk optical fiber 1211 is connected to the first trunk fiber outlet 1201, and a second trunk optical fiber 1212 is connected to the second trunk fiber outlet 1202. For a description of the first trunk optical fiber 1211 and the second trunk optical fiber 1212, please refer to Fig. 9 It should be noted that in this embodiment, the panel 1200 includes two main fiber outlets. If the optical terminal device is Figure 2In the embodiment shown, only one trunk optical fiber is connected, so the panel 1200 may include only one trunk fiber outlet. The first trunk fiber outlet 1201 is connected to the first trunk port 903 by an optical fiber, so that the conduction of the optical path between the combining port of WDM201 and the first trunk optical fiber 1211 is guaranteed. The second trunk fiber outlet 1202 is connected to the second trunk port 904 by an optical fiber, so that the conduction of the optical path between the combining port of WDM201 and the second trunk optical fiber 1212 is guaranteed. The multiple fiber outlets on the panel 1200 also include multiple branch fiber outlets, such as branch fiber outlet 1203, branch fiber outlet 1204 and branch fiber outlet 1205. It should be clear that the description of the arrangement positions of the multiple fiber outlets included on the panel in this embodiment is an optional example and is not limited. The branch fiber outlet 1203, the branch fiber outlet 1204 and the branch fiber outlet 1205 are respectively used to connect the third branch optical fiber. For the description of the third branch optical fiber, see Figure 8 The corresponding description is not repeated in detail. It can be understood that one end of the third branch optical fiber is connected to a branch fiber outlet on the panel 1200, and the other end is connected to the second optical module. This embodiment does not limit the specific number of branch fiber outlets. The panel 1200 may also include an extended fiber outlet 1206, which is used to access the extended wavelength, so that based on the extended fiber outlet 1206, the optical terminal device can access services with more wavelengths.

[0091] The panel 1200 and the outer shell 1100 shown in this embodiment can be in a detachable connection state. Then, when it is necessary to change the connection relationship between the first optical module and the splitter port of WDM201, the panel 1200 can be removed from the outer shell 1100 to achieve the purpose of changing the connection relationship between the first optical module and the splitter port of WDM201. For instructions on changing the connection relationship between the first optical module and the splitter port of WDM201, refer to Figure 6The corresponding instructions are not described in detail. It can be understood that when the panel 1200 is removed from the outer shell 1100, one end of the first branch optical fiber can be removed from the first branch port on the WDM fixing frame 200 and connected to the branch fiber outlet (for example, the branch fiber outlet 1203) to achieve the conduction of the optical path between the second optical module and the WDM201. This embodiment does not limit the method of detachable connection between the panel 1200 and the outer shell 1100, for example, it can be achieved by any method such as screws, locks, mechanical plug-ins, buckles, snaps, magnets, slide rails, etc., to ensure that the panel 1200 and the outer shell 1100 can be disassembled and reassembled through simple operations without destroying or damaging any parts. Optionally, to improve the safety of the optical terminal device, the panel 1200 and the outer shell 1100 are detachably connected through a locking structure. When the locking mechanism is in a locked state, the panel 1200 is installed on the outer shell 1100. When the locking mechanism is in an unlocked state (for example, a special key is inserted into the locking mechanism to unlock), the WDM fixing seat inside the outer shell 1100 is exposed, so as to facilitate the insertion, removal, and change of connection relationship of the branch optical fiber on the WDM fixing seat. This embodiment does not limit the locking mechanism, as long as the locking and unlocking states can be achieved.

[0092] In this example, each branch fiber outlet can be a fiber adapter. One end of the branch fiber connected to the second optical module has a fiber connector, which can be inserted into the fiber adapter to achieve the conduction of the optical path between the second optical module and WDM201. The fiber adapter can be a Lucent connector (LC), a standard connector (SC), a subscriber connector (ST), a ferrule connector (FC), a miniature unit connector (MU), etc. This embodiment does not limit the specific type of the fiber adapter.

[0093] Fig.11 Taking one fiber outlet on the outer shell 1100 connected to one optical fiber as an example, in other examples, one fiber outlet can be connected to multiple optical fibers. For example, one fiber outlet can be connected to the first trunk optical fiber and the second trunk optical fiber at the same time. In another example, one fiber outlet can be connected to multiple branch optical fibers. This embodiment does not limit the number of optical fibers connected to each fiber outlet.

[0094] Continue to see Fig.11As shown, the outer shell 1100 can also be detachably connected to a dust cover 1110, and the M first optical modules are located in the dust cover 1110. Then, the dust cover 1110 can protect the M first optical modules from dust and water. For the description of the M first optical modules, please refer to Figure 2 The corresponding instructions are not described in detail. For the instructions on the detachable connection between the outer shell 1100 and the dust cover 1110 shown in this embodiment, please refer to the instructions on the detachable connection between the outer shell 1100 and the panel 1200, which are not described in detail. When the dust cover 1110 is removed from the outer shell 1100, the M first optical modules on the optical module fixing seat 210 are exposed. Then, the first optical module can be taken out from the optical module fixing seat 210 at any time as needed, or the first optical module can be installed on the optical module fixing seat 210. In this embodiment, the dust cover 1110 and the panel 1200 are two independent parts on the outer shell 1100 as an example. In other examples, the dust cover 1110 and the panel 1200 can be the same part on the outer shell 1100, that is, the dust cover 1110 and the panel 1200 are connected to form an integral body.

[0095] It should be clear that the description of the 1100 structure in this embodiment is an optional example and is not limited, as long as the outer shell 1100 can achieve dust-proof, waterproof and other protection functions for the WDM fixing seat, the optical module fixing seat, the M first optical modules and each branch optical fiber.

[0096] The following combination Figure 2 as well as Fig.13 The figure specifically illustrates the specific structure of the optical module fixing seat 210. Fig.13 1 is a structural example diagram in which the first optical module has not yet been installed in the optical module fixing seat. The optical module fixing seat 210 includes a plurality of mounting slots 1300, each of which has a notch 1302. The mounting module 1301 can be inserted into the interior of the mounting slot 1300 through the notch of the mounting slot 1300, or the mounting module 1301 can be taken out from the interior of the mounting slot 1300 through the notch of the mounting slot 1300. Fig.14This is a structural example diagram of the first optical module being installed in the optical module fixing seat. When the installation module 1301 is taken out from the inside of the installation slot 1300, the first optical module can be placed inside the installation module 1301, and then the installation module 1301 is inserted into the inside of the installation slot 1300 to achieve the dustproof, waterproof and other protective effects of the installation module 1301 on the first optical module. Optionally, in order to enhance the protective effect on the first optical module, an elastic member is included between the protection module 1301 and the installation slot 1300, so that the elastic member is supported between the protection module 1301 and the installation slot 1300, thereby preventing the protection module 1301 from detaching from the inside of the installation slot 1300 without the operation of the operation and maintenance personnel, and enhancing the dustproof and waterproof protective effect. It should be clear that the description of the structure of the optical module fixing seat 210 in this embodiment is an optional example and is not limited, as long as the optical module fixing seat 210 can fix the first optical module. For example, the optical module fixing seat may include multiple slots, and the first optical module can be directly inserted into the slots.

[0097] The present application also provides a communication system. For a description of the structure of the communication system, see Figure 1 The corresponding instructions are not elaborated in detail.

[0098] In the several embodiments provided in this application, it should be understood that the disclosed systems, structures and components can be implemented in other ways. For example, the embodiments described above are only schematic, for example, the division of each component is only a logical function division, and there may be other division methods in actual implementation, such as multiple components can be combined or integrated into another system, or some features can be ignored. Another point is that the positional relationship or connection relationship between each other shown or discussed can be mechanical or other forms.

Claims

1. An optical terminal device, characterized in that: It includes a fixed frame, a wavelength division multiplexer and M first optical modules, where M is an arbitrary integer not less than 1, the wavelength division multiplexer is installed on the fixed frame, the first wavelength division port of the wavelength division multiplexer is connected to the first branch optical fiber, the first optical module is detachably installed on the fixed frame, and the first optical module is connected to one of the first wavelength division ports of the wavelength division multiplexer through the first branch optical fiber.

2. The optical terminal device according to claim 1, characterized in that: The optical terminal device further comprises a second branch optical fiber, one end of which is connected to a second wavelength division port of the wavelength division multiplexer, and the other end of which is suspended.

3. The optical terminal device according to claim 1 or 2, characterized in that: The optical terminal device further includes a reflective film, which is disposed on the first optical module or the wavelength division multiplexer and is used to reflect the received detection optical signal.

4. The optical terminal device according to claim 1, characterized in that: The optical terminal device further comprises an outer shell, and the outer shell accommodates the fixing frame.

5. The optical terminal device according to claim 4, characterized in that: The outer shell is detachably connected to a dust cover, and the M first optical modules are located inside the dust cover.

6. The optical terminal device according to claim 1, characterized in that: The optical terminal device also includes a third branch optical fiber and a second optical module, one end of the second optical module is connected to a third wavelength division port of the wavelength division multiplexer through the third branch optical fiber, and the other end of the second optical module is used to connect to an access device.

7. The optical terminal device according to claim 1, characterized in that: The fixing frame is installed with an optical coupler, one end of the optical coupler is connected to the wavelength division multiplexer's combining port, and the other end of the optical coupler is used to connect the first trunk optical fiber and the second trunk optical fiber respectively. The first trunk optical fiber and the second trunk optical fiber are also used to connect to a convergence device.

8. A communication system, characterized in that: It comprises a converging device and an optical terminal device as claimed in any one of claims 1 to 7, wherein the converging device and the optical terminal device are connected via a trunk optical fiber.

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