CN117318804A - A passive optical network physical link monitoring system, method and related devices - Google Patents

Abstract

The utility model provides a passive optical network physical link monitoring system, method and relevant device, set up pulse transmitting device, coupling device and detection device, pulse transmitting device launches the light pulse of different wavelength, the wavelength of light pulse corresponds with n optical network units respectively, couple to the optical network through coupling device, detection device acquires the power and the distance corresponding information of light pulse in trunk line link and each branch optical fiber link, can know the condition of each position department on trunk line link and each branch optical fiber link. The method and the device take the light pulses with different wavelengths as monitoring signals to respectively monitor the conditions of each optical fiber link and the trunk link, can sense the potential threat of the physical link in advance and perform early warning, can timely locate the fault point after encountering sudden accidents, and are convenient for daily maintenance and accident emergency repair of the passive optical network link.

Description

A passive optical network physical link monitoring system, method and related devices

Technical field

The present application belongs to a link monitoring system, and specifically relates to a passive optical network physical link monitoring system, method and related devices.

Background technique

Distribution communication network is a critical infrastructure for monitoring and controlling power distribution systems. It connects various power distribution equipment, sensors and monitoring systems through digital communication technology to monitor, manage and control the power distribution network to improve the reliability, efficiency and safety of the power system. The communication services it mainly carries include: real-time monitoring of distribution network, remote control, fault detection and diagnosis, distributed power supply control, intelligent load management, etc. Passive Optical Network (PON) is a common optical fiber communication technology in power distribution communication networks above 35kV, and is a form of power communication access network. It has the characteristics of distributed point-to-multipoint structure, communication TDM uplink and downlink separation, high bandwidth and high information security.

The passive optical network in the distribution communication network mainly relies on the incoming optical cables above 35kV in the distribution network for construction. However, the urban environment is complex, and underground optical cables are prone to digging, extrusion, or wear due to construction activities. Overhead optical cables may also be damaged by animal bites and natural disasters (such as storms or tree collapses), thereby affecting power transmission and power Transmission of communication signals. In addition, due to the large number of control devices involved in medium and high-voltage distribution networks of 35kV and above and the complexity of the distribution communication business organization, the link monitoring and operation and maintenance of passive optical networks has become a major issue for the reliable operation of the distribution communication business, especially respectively. Monitoring the physical link of each ONU is of great significance for assessing distribution network control business operation risks.

Current link monitoring of passive optical network systems is mainly carried out from two aspects: performance data and physical links, and research shows that at least 80% of faults occur in optical fiber physical links. In terms of physical link monitoring, PON link monitoring technology evaluates the status of the physical link of the network through monitoring equipment deployed at the CO (central office) and some other passive devices. It can identify and identify Locate faults in optical fibers, and be able to respond quickly when optical fiber faults occur to learn the cause and location of the fault.

However, the monitoring and operation and maintenance of existing physical links still have the following problems:

(1) It is difficult to identify and locate physical link faults in star topology. Using only PON network management system data monitoring technology, after a fiber physical link fails, it is impossible to distinguish the fault type and locate the fault location.

(2) After setting up a protection topology and a single physical link fails, it is difficult to evaluate the operation risk of the ONU equipment. Since the real-time operation and maintenance of the power distribution communication network is low, after a specific network protection topology is formed, the operation and maintenance repair period for a single channel failure is long. At this stage, it is impossible to evaluate the operation risk of a single ONU.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, this application provides a passive optical network physical link monitoring system, method and related devices.

In order to achieve the above objectives, this application adopts the following technical solutions:

In the first aspect, this application proposes a passive optical network physical link monitoring system. The optical fiber link of the passive optical network physical link includes a first optical line terminal, an optical distribution network and n optical network units, The optical distribution network includes n first unequal optical splitters, where n is an integer greater than or equal to 1; including:

A pulse emitting device, the output end of which is connected to the output end of the first optical line terminal, is used to emit optical pulses of different wavelengths, the wavelengths of the optical pulses respectively correspond to each optical network unit, and the optical pulses correspond to the wavelengths of each optical network unit. Network communication signal wavelengths do not overlap;

A coupling device, connected to the output end of the optical pulse transmitting device, for coupling the optical pulse into the optical wiring network;

A detection device, the receiving end is connected to the output end of the first optical line terminal, and is used to obtain the power and distance corresponding information of the optical pulse in the trunk link and the corresponding branch optical fiber link of each optical network unit, and complete the detection of each branch optical fiber link. monitor.

Further, it also includes n first wavelength division multiplexers and n second wavelength division multiplexers;

The physical link of the passive optical network adopts a two-way hand-in-hand protection structure, and the backup optical fiber link includes a second optical line terminal and n second unequal optical splitters;

The input terminals of n first wavelength division multiplexers are respectively connected to the output terminals of n first unequal optical splitters, and the input terminals of n second wavelength division multiplexers are respectively connected to nth The output end of the two unequal splitters;

One output end of n first wavelength division multiplexers and n second wavelength division multiplexers is respectively connected to n optical network units, and the other output of n first wavelength division multiplexers is One end is connected to the other end of n second wavelength division multiplexers respectively. The allowed wavelength of each first wavelength division multiplexer corresponds to the optical pulse emitted by the pulse transmitting device respectively, and is connected to the same optical network unit. The allowed passing wavelengths of the first wavelength division multiplexer and the second wavelength division multiplexer are the same.

Further, it also includes an isolation device;

The isolation device is connected between the second optical line terminal and the first and second unequal optical splitters.

Further, the detection device adopts OTDR.

Further, the pulse transmitting device and the detecting device jointly adopt T-OTDR.

Further, both the coupling device and the isolation device adopt wavelength division multiplexers.

In the second aspect, this application proposes a passive optical network physical link monitoring method, which is applied to the above-mentioned power passive optical network physical link monitoring system; including the following steps:

Obtain the power and distance corresponding information of the optical pulse in the trunk link and each branch optical fiber link;

Draw the power-distance curve of the light pulse according to the power and distance corresponding information;

According to the power-distance curve of the optical pulse, the faults and losses of the trunk link and each branch optical fiber link are determined, as well as the locations where the faults and losses occur.

Further, the obtaining of the power and distance corresponding information of the optical pulses in the trunk link and each branch optical fiber link includes:

Obtain the scattering information and reflection information of the optical pulse in the trunk link and each branch optical fiber link, and obtain the power and distance corresponding information of the optical pulse in each trunk link and each branch optical fiber link;

Determining the faults and losses of the trunk link and each branch optical fiber link also includes: issuing a warning message.

In a third aspect, this application proposes a non-volatile storage medium. A program is stored in the non-volatile storage medium. When the program is running, the device where the non-volatile storage medium is located is controlled to execute the above-mentioned A passive optical network physical link monitoring method.

In a fourth aspect, this application proposes an electronic device, including: a memory and a processor, the processor being configured to run a program stored in the memory, wherein when the program is running, the above-mentioned passive optical network physical chain is executed. Road monitoring methods.

Compared with the existing technology, this application has the following beneficial effects:

This application proposes a passive optical network physical link monitoring system, which is provided with a pulse emission device, a coupling device and a detection device. The pulse emission device emits optical pulses of different wavelengths. The wavelengths of the optical pulses correspond to n optical network units respectively. Coupled to the optical distribution network through the coupling device, the detection device obtains the power and distance corresponding information of the optical pulses in the trunk link and each branch optical fiber link, and can know the situation at each position on the trunk link and each branch optical fiber link. This application uses optical pulses of different wavelengths as monitoring signals to monitor the conditions of each optical fiber link and trunk link respectively. It can sense potential threats to the physical link in advance and provide early warning. It can also locate faults in time after encountering a sudden accident. points to clarify the operational risks of a single ONU and facilitate daily maintenance and accident repair of passive optical network links.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a first structural diagram of a passive optical network physical link monitoring system provided by an embodiment of the present application;

Figure 2 is a second structural diagram of a passive optical network physical link monitoring system provided by an embodiment of the present application;

Figure 3 is a third structural diagram of a passive optical network physical link monitoring system provided by an embodiment of the present application;

Figure 4 is a schematic flowchart of a passive optical network physical link monitoring method provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of this application, but not all of them. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the application provided in the appended drawings is not intended to limit the scope of the claimed application, but rather to represent selected embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

It should be noted that similar reference numerals and letters represent similar items in the following figures, therefore, once an item is defined in one figure, it does not need further definition and explanation in subsequent figures.

In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. appear to indicate an orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. , or the orientation or positional relationship in which the product of this application is usually placed when used, is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation or be constructed in a specific orientation. and operation, and therefore cannot be construed as a limitation on this application. In addition, the terms "first", "second", etc. are only used to differentiate descriptions and are not to be understood as indicating or implying relative importance.

In addition, if the term "level" appears, it does not mean that the component is required to be absolutely horizontal, but may be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical". It does not mean that the structure must be completely horizontal, but can be slightly tilted.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stipulated and limited, if the terms "setting", "installation", "connecting" and "connecting" appear, they should be understood in a broad sense. For example, they can It can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or it can be an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

PON has a huge application market and complex application scenarios. Whether from the perspective of quality or continuity, improving the reliability of PON has become increasingly important.

Regarding the PON link monitoring system, there is currently no unified and widely used solution, and even in most areas, there is no effective line protection mechanism. Existing data monitoring technical means mainly generate virtual network topology based on network elements by monitoring hosts, network equipment nodes, user-side embedded monitoring equipment, etc., and use the system center manager and a series of network management protocols to collect communication networks. Data status information cannot satisfy the status awareness and fault location of optical fiber physical links.

The physical link structure of PON mainly includes the optical line terminal (Optical Line Terminal, OLT) of the central office, the terminal optical network unit (Optical Network Unit, ONU) and the optical distribution network (Optical Distribution Network, ODN). Among them, ODN includes passive components such as optical splitters (Splitter), and does not contain any electronic components and power supplies. In PON, the upstream transmission time is divided into several time slots, and each time slot corresponds to an ONU. In this way, in the upstream direction, all ONU signals can be transmitted to the OLT through one wavelength channel. In the downlink direction, the OLT sends signals to all ONUs at the same time. Each ONU receives all signals and then only selects its own time slot signal.

Please refer to Figure 1. Figure 1 is a first structural diagram of a passive optical network physical link monitoring system provided by an embodiment of the present application.

An embodiment of the present application provides a passive optical network physical link monitoring system. The optical fiber link of the passive optical network physical link includes a first optical line terminal, an optical distribution network and n optical network units. The optical fiber link The distribution network includes n first unequal splitters, where n is an integer greater than or equal to 1. The monitoring system may include: a pulse emission device, a coupling device and a detection device.

A pulse emitting device, the output end of which is connected to the output end of the first optical line terminal, is used to emit optical pulses of different wavelengths, the wavelengths of the optical pulses respectively correspond to each optical network unit, and the optical pulses communicate with the network of each optical network unit Signal wavelengths do not overlap. The coupling device is connected to the output end of the optical pulse transmitting device and is used to couple the optical pulse into the optical wiring network. A detection device, the receiving end is connected to the output end of the first optical line terminal, and is used to obtain the power and distance corresponding information of the optical pulse in the trunk link and the corresponding branch optical fiber link of each optical network unit, and complete the detection of each branch optical fiber link. monitor.

In this application, the pulse transmitting device emits optical pulses of different wavelengths as monitoring signals. In order not to affect the normal communication of the network, the wavelengths of the optical pulses and the network communication signals of each optical network unit do not overlap. The wavelength of the optical pulse corresponds to each optical network unit respectively, so that the present application can monitor the branch optical fiber link corresponding to each optical network unit. In addition, while the optical pulse monitors each optical network unit, it passes through the trunk link. Therefore, this application can also monitor the trunk link.

The coupling device is used to couple the optical pulse into the optical distribution network, and then the detection device can obtain the power and distance corresponding information of the optical pulse in the trunk link and each branch optical fiber link, and can know whether the trunk link and each branch optical fiber link are A fault occurs or a hidden danger exists, and the location information of the fault or hidden danger is determined based on the distance information.

This application proposes a passive optical network physical link monitoring system that couples optical pulses and communication signals of different wavelengths to the same link. The optical pulses and communication signals used as monitoring signals do not interfere with each other and can accurately monitor the occurrence or existence of faults. The location and extent of the hazard. The monitoring system of the present application can be applied to various passive optical network physical links, has strong versatility and is easy to implement.

Please refer to Figure 2. Figure 2 is a schematic structural diagram of a passive optical network physical link monitoring system including a source optical network physical link and an embodiment of the present application.

An embodiment of the present application provides a passive optical network physical link monitoring system. Taking the power PON system as an example, the passive optical network physical link adopts a two-way hand-in-hand protection structure as an example. A backup optical fiber link is provided. The backup optical fiber The link includes a second optical line terminal and n second unequal optical splitters, and may also include a pulse emission device, a coupling device, a detection device, n first wavelength division multiplexers, and n second wavelength division multiplexers. devices and isolation devices. In Figure 2, OLT 2 represents the second optical line terminal, Splitter 1' to Splitter n' represent the second unequal optical splitter, OLT 1 represents the first optical line terminal, and Splitter 1 to Splitter n represent n first unequal splitters. Optical splitter, WDM 1 to WDM n represent n first wavelength division multiplexers, WDM 1' to WDM n' represent n first wavelength division multiplexers, and WDM 0' represents an isolation device. Among them, OLT 1 and OLT 2 are located at both ends of the distribution network optical cable. They are composed of unequal optical splitters Splitter 1 to Splitter n and Splitter 1' to Splittern', respectively connecting dual-port ONU 1 to ONU n and two OLTs to form Two-way hand-in-hand protection.

The input terminals of the n first wavelength division multiplexers are respectively connected to the output terminals of the n first unequal splitters, and the input terminals of the n second wavelength division multiplexers are respectively connected to the n second unequal splitters. The output of the optical splitter. One output end of the n first wavelength division multiplexers and n second wavelength division multiplexers is respectively connected to n optical network units, and the other output end of the n first wavelength division multiplexers is respectively connected to the nth At the other end of the two wavelength division multiplexers, the allowed wavelengths of each first wavelength division multiplexer respectively correspond to the optical pulses emitted by the pulse transmitting device, and are connected to the first wavelength division multiplexer of the same optical network unit. It is the same as the allowed passing wavelength of the second wavelength division multiplexer.

This application can allocate a special "monitoring signal wavelength" to each optical network unit, and form a monitoring bypass through the first wavelength division multiplexer and the second wavelength division multiplexer of the corresponding wavelength. The optical network units of each branch optical fiber link are bridged so that the monitoring signal can bypass the optical network unit and reach the backup optical fiber link, so that the complete dual-homing protected optical fiber link is under monitoring.

In some embodiments of the present application, an isolation device can also be deployed on the second optical line terminal side, and the isolation device is connected between the second optical line terminal and the first second unequal optical splitter. For the two-way hand-in-hand protection structure, the monitoring signal input can be avoided on the second optical line terminal side. The specific structure of the isolation device can be selected according to actual needs and is not limited in this application.

In other embodiments of the present application, both the coupling device and the isolation device can use wavelength division multiplexers, which facilitates design and application.

Please refer to Figure 3. Figure 3 is a schematic structural diagram of a passive optical network physical link monitoring system including a source optical network physical link and an embodiment of the present application.

An embodiment of the present application provides a passive optical network physical link monitoring system. Taking the power PON system as an example, the passive optical network physical link adopts a two-way hand-in-hand protection structure as an example. A backup optical fiber link is provided. The backup optical fiber The link includes a second optical line terminal and n second unequal optical splitters, and may also include a pulse emission device, a coupling device, a detection device, n first wavelength division multiplexers, and n second wavelength division multiplexers. devices and isolation devices.

In practical applications, the pulse transmitting device only needs to be able to emit optical pulses of different wavelengths, and the detection device only needs to be able to obtain corresponding information about the power and distance of the optical pulses in the link. The specific device type and structure used can be determined as needed. Make your choice, there are no restrictions in this application.

In some embodiments of the present application, the detection device can use OTDR (Optical Time Domain Reflectometry, optical time domain reflectometry). Further preferably, the detection device and the pulse emission device can be integrated into one, using T-OTDR (Tunable OTDR, Tunable wavelength optical time domain reflectometer). T-OTDR can measure optical fiber characteristics of different wavelengths by changing the wavelength of emitted light pulses, and can be used for analysis and testing of multi-wavelength optical fiber networks, as well as more complex measurements and applications in the fields of optical fiber communications and sensing. The backscattering caused by Rayleigh scattering and Fresnel reflection when light is transmitted in the optical fiber is used to understand the uniformity, defects, fractures, connector coupling and other properties of the optical fiber. When the light pulse encounters cracks during the propagation of the optical fiber, , breakpoints, joints, bends, etc., the light pulse will produce a sudden reflection or attenuation. This reflection or attenuation information is captured by the OTDR and used to analyze the characteristics of the optical fiber. The Rayleigh scattering power obtained by OTDR is an exponential attenuation curve, which represents the loss along the optical fiber. OTDR can obtain the power and distance information of the optical fiber by measuring the backscattering and reflection information in the optical fiber. The T-OTDR device detects ONU links individually by changing different wavelengths, and generates "power-distance" curves corresponding to the trunk link and each branch optical fiber link, thereby obtaining fault and loss information of each optical fiber link. It also solves the basic problems encountered by ordinary OTDR in point-to-multipoint network monitoring, and can identify different branch users and accurately locate and analyze faults. T-OTDR is deployed on the OLT 1 side, and its optical pulse is a wavelength-tunable laser source. The T-OTDR is coupled into the optical distribution network ODN through WDM 0.

The optical pulses do not overlap with the wavelengths of the network communication signals of each optical network unit. As an example, the optical pulses emitted by the T-OTDR can be located in the U-band or L-band, and the OTDR is used to carry out link monitoring and assist in operation, maintenance and maintenance. At the same time, the wavelength of the communication signal is in the C-band.

As an example, in distribution networks of 35kV and above, OLT 1, OLT 2 and T-OTDR are deployed in 110kV substations, and ONUs are deployed in medium and high-voltage distribution network substations, distribution rooms, and switching stations, forming a hand-in-hand protection structure , through the monitoring method of this application, large-scale physical link monitoring of distribution network passive optical networks can be realized. In another example, in a medium and low-voltage distribution network where optical cables are partially deployed, OLT 1, OLT 2 and T-OTDR are deployed in the 35kV substation, and the ONU is deployed in the ring main unit, switching station, 10kV station area transformer, and distribution network. The electric room and the electric vehicle charging station form a hand-in-hand protection structure. Through the monitoring method of this application, large-scale physical link monitoring of the passive optical network of the distribution network can be realized.

This application adopts a chain topology in the distribution network and configures corresponding network protection, which is suitable for passive optical network physical link monitoring in various fields. In the power PON system, the optical fiber protection switching mechanism should be adopted, and the optical fiber link topology should be laid according to dual-homing protection. The OLT and PON interfaces of the optical fiber link and the backup optical fiber link are both in working status. The OLT should ensure that the service information of the active PON interface can be synchronously backed up to the standby PON interface, so that during the protection switching process, the standby PON interface can maintain the service attributes of the ONU unchanged. Both ONU and OLT detect the link status and decide whether to switch based on the link status.

Please refer to Figure 4. Figure 4 is a schematic flow chart of a passive optical network physical link monitoring method according to an embodiment of the present application.

The embodiment of the present application provides a passive optical network physical link monitoring method, which may include the following steps:

S101: Obtain the power and distance corresponding information of the optical pulse in the trunk link and each branch optical fiber link.

In practical applications, optical pulses of different wavelengths can be emitted. Since the monitoring signal wavelength of each ONU is different, the trunk link and each branch optical fiber link can be detected separately to obtain the corresponding information of power and distance. If T-OTDR is used, optical pulses of different wavelengths can be emitted, and the corresponding information of power and distance can also be obtained. By obtaining the scattering and reflection information of the optical pulse in the trunk link and each branch optical fiber link, various information can be obtained. Corresponding information about the power and distance of optical pulses in the trunk link and each branch optical fiber link.

S102: Draw the power-distance curve of the light pulse based on the power and distance corresponding information.

S103. According to the power-distance curve of the optical pulse, determine the faults and losses of the trunk link and each branch optical fiber link, as well as the locations where the faults and losses occur.

In some embodiments of the present application, warning information can also be issued when failure or loss occurs, or different warning information can be issued according to the type and location of failure and loss.

Embodiments of the present application also provide a non-volatile storage medium with a program stored in the non-volatile storage medium, wherein when the above-mentioned program is running, the passive light source on the device where the non-volatile storage medium is located is controlled to execute. Network physical link monitoring methods.

The above-mentioned non-volatile storage medium is used to store programs that perform the following functions: obtain the power and distance corresponding information of the optical pulse in the trunk link and each branch optical fiber link; draw the power of the optical pulse based on the power and distance corresponding information -Distance curve; according to the power-distance curve of the optical pulse, determine the faults and losses of the trunk link and each branch optical fiber link, as well as the location of the faults and losses.

An embodiment of the present application also provides an electronic device. The electronic device includes: a memory and a processor. The processor is configured to run a program stored in the memory. When the program is running, the above passive optical network physical link monitoring method is executed. .

The above-mentioned processor is used to run a program that performs the following functions: obtains the power and distance corresponding information of the optical pulse in the trunk link and each branch optical fiber link; draws the power-distance curve of the optical pulse according to the power and distance corresponding information; The power-distance curve of the optical pulse determines the faults and losses of the trunk link and each branch fiber link, as well as the location where the faults and losses occur.

The above sequence of the embodiments of the present application is only for description and does not represent the advantages and disadvantages of the embodiments.

In the above-mentioned embodiments of the present application, each embodiment is described with its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units may be a logical functional division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or may be Integrated into another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the units or modules may be in electrical or other forms.

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

In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or contributes to the relevant technology, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, It includes several instructions to cause a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage media include: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program code. .

The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection scope of this application.

Claims (10)

1. A passive optical network physical link monitoring system. The optical fiber link of the passive optical network physical link includes a first optical line terminal, an optical distribution network and n optical network units. The optical distribution The network includes n first unequal splitters, n is an integer greater than or equal to 1; it is characterized by including: A pulse emitting device, the output end of which is connected to the output end of the first optical line terminal, is used to emit optical pulses of different wavelengths, the wavelengths of the optical pulses respectively correspond to each optical network unit, and the optical pulses correspond to the wavelengths of each optical network unit. Network communication signal wavelengths do not overlap; A coupling device, connected to the output end of the optical pulse transmitting device, for coupling the optical pulse into the optical wiring network; A detection device, the receiving end is connected to the output end of the first optical line terminal, and is used to obtain the power and distance corresponding information of the optical pulse in the trunk link and the corresponding branch optical fiber link of each optical network unit, and complete the detection of each branch optical fiber link. monitor. 2. The power passive optical network physical link monitoring system according to claim 1, characterized in that: it also includes n first wavelength division multiplexers and n second wavelength division multiplexers; The physical link of the passive optical network adopts a two-way hand-in-hand protection structure, and the backup optical fiber link includes a second optical line terminal and n second unequal optical splitters; The input terminals of n first wavelength division multiplexers are respectively connected to the output terminals of n first unequal optical splitters, and the input terminals of n second wavelength division multiplexers are respectively connected to nth The output end of the two unequal splitters; One output end of n first wavelength division multiplexers and n second wavelength division multiplexers is respectively connected to n optical network units, and the other output of n first wavelength division multiplexers is One end is connected to the other end of n second wavelength division multiplexers respectively. The allowed wavelength of each first wavelength division multiplexer corresponds to the optical pulse emitted by the pulse transmitting device respectively, and is connected to the same optical network unit. The allowed passing wavelengths of the first wavelength division multiplexer and the second wavelength division multiplexer are the same. 3. The power passive optical network physical link monitoring system according to claim 2, characterized in that: it further includes an isolation device; The isolation device is connected between the second optical line terminal and the first and second unequal optical splitters. 4. The power passive optical network physical link monitoring system according to any one of claims 1 to 3, characterized in that: the detection device adopts an OTDR. 5. The power passive optical network physical link monitoring system according to claim 4, characterized in that: the pulse transmitting device and the detecting device both adopt T-OTDR. 6. The power passive optical network physical link monitoring system according to claim 5, characterized in that: both the coupling device and the isolation device adopt wavelength division multiplexers. 7. A passive optical network physical link monitoring method, characterized in that the monitoring method is applied to the power passive optical network physical link monitoring system of any one of claims 1 to 6; including the following steps: Obtain the power and distance corresponding information of the optical pulse in the trunk link and each branch optical fiber link; Draw the power-distance curve of the light pulse according to the power and distance corresponding information; According to the power-distance curve of the optical pulse, the faults and losses of the trunk link and each branch optical fiber link are determined, as well as the locations where the faults and losses occur. 8. A passive optical network physical link monitoring method according to claim 7, characterized in that said obtaining the power and distance corresponding information of optical pulses in the trunk link and each branch optical fiber link includes: Obtain the scattering information and reflection information of the optical pulse in the trunk link and each branch optical fiber link, and obtain the power and distance corresponding information of the optical pulse in each trunk link and each branch optical fiber link; Determining the faults and losses of the trunk link and each branch optical fiber link also includes: issuing a warning message. 9. A non-volatile storage medium, characterized in that a program is stored in the non-volatile storage medium, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the claims. The passive optical network physical link monitoring method described in 7 or 8. 10. An electronic device, characterized by comprising: a memory and a processor, the processor being configured to run a program stored in the memory, wherein when the program is run, the wireless device of claim 7 or 8 is executed. Source optical network physical link monitoring method.