CN117318804A - Passive optical network physical link monitoring system, method and related device - Google Patents
Passive optical network physical link monitoring system, method and related device Download PDFInfo
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- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
- H04B10/0771—Fault location on the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
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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
Technical Field
The application belongs to a link monitoring system, and particularly relates to a passive optical network physical link monitoring system, a passive optical network physical link monitoring method and a related device.
Background
A power distribution communication network is a critical infrastructure for power distribution system monitoring and control. The power distribution system is used for connecting various power distribution equipment, sensors and monitoring systems through a digital communication technology, and monitoring, managing and controlling the power distribution network so as to improve the reliability, efficiency and safety of the power system. The communication services mainly carried by the method comprise the following steps: distribution network real-time monitoring, remote control, fault detection and diagnosis, distributed power control, intelligent load management and the like. A passive optical network (Passive Optical Network, PON) is a common optical fiber communication technology in a power distribution communication network above 35kV, and is a form of power communication access network. The system has the characteristics of distributed point-to-multipoint structure, TDM uplink and downlink separation of communication, high bandwidth and higher information security.
A passive optical network in a power distribution communication network is mainly built by relying on an optical cable with the voltage of more than 35kV in the power distribution network. However, the urban environment is complex, the buried optical cable is easy to dig, squeeze or wear due to engineering construction activities, and the aerial optical cable can be damaged by an engaged animal or natural disasters (such as storm or tree collapse), so that the transmission of power transmission and power communication signals is affected. In addition, as the control devices in the medium-high voltage distribution network with 35kV and above are numerous, the distribution communication service organization is complex, so that the link monitoring operation and maintenance of the passive optical network becomes a main problem of reliable operation of the distribution communication service, and especially, the monitoring of the physical links of each ONU is significant for evaluating the operation risk of the distribution network control service.
Current passive optical network system link monitoring is largely extended from both performance data and physical links, and studies have shown that at least 80% of failures occur in fiber optic physical links. In the aspect of physical link monitoring, the PON link monitoring technology evaluates the physical link state of a network through monitoring equipment and other passive devices deployed at a CO (central office), can identify and locate faults in an optical fiber while the PON transmits data, and can quickly respond to the faults of the optical fiber when the faults of the optical fiber occur, so as to learn the cause and the position of the faults.
However, the following problems still remain in the monitoring operation of the existing physical links:
(1) The star topology physical link failure is difficult to identify and locate. Only the network management system data monitoring technology of the PON is used, after the optical fiber physical link fails, the failure type cannot be distinguished, and the failure position cannot be positioned.
(2) And after the protection topology is set and a single physical link fails, the running risk of the ONU equipment is difficult to evaluate. Because the operation and maintenance real-time performance of the distribution communication network is low, after a specific network protection topology is formed, the single-path failure operation and maintenance rush-repair period is long, and at the stage, the single ONU operation risk cannot be evaluated.
Disclosure of Invention
The application provides a passive optical network physical link monitoring system, a passive optical network physical link monitoring method and a related device for solving the problems in the prior art.
In order to achieve the above purpose, the present application is implemented by adopting the following technical scheme:
in a first aspect, the present application proposes a passive optical network physical link monitoring system, where an optical fiber link of a passive optical network physical link includes a first optical line terminal, an optical distribution network, and n optical network units, where the optical distribution network includes n first unequal optical splitters, and n is an integer greater than or equal to 1; comprising the following steps:
the output end of the pulse transmitting device is connected with the output end of the first optical line terminal and is used for transmitting optical pulses with different wavelengths, the wavelengths of the optical pulses respectively correspond to the optical network units, and the optical pulses are not overlapped with the network communication signal wavelengths of the optical network units;
the coupling device is connected to the output end of the optical pulse transmitting device and is used for coupling the optical pulse into the optical wiring network;
and the receiving end is connected with the output end of the first optical line terminal and is used for acquiring the power and distance corresponding information of the optical pulses in the trunk line link and the branch optical fiber links corresponding to the optical network units and completing the monitoring of the branch optical fiber links.
Further, the system also comprises n first wavelength division multiplexers and n second wavelength division multiplexers;
the passive optical network physical link adopts a bidirectional hand-held protection structure, and the standby optical fiber link comprises a second optical line terminal and n second unequal optical splitters;
the input ends of the n first wavelength division multiplexers are respectively connected with the output ends of the n first halving optical splitters, and the input ends of the n second wavelength division multiplexers are respectively connected with the output ends of the n second halving optical splitters;
the n first wavelength division multiplexers and the n second wavelength division multiplexers have one output end respectively connected with n optical network units, the other output end of the n first wavelength division multiplexers is respectively connected with the other end of the n second wavelength division multiplexers, the allowed passing wavelength of each first wavelength division multiplexer corresponds to the optical pulse transmitted by the pulse transmitting device, and the allowed passing wavelength of the first wavelength division multiplexer and the second wavelength division multiplexer connected with the same optical network unit is the same.
Further, the device also comprises an isolation device;
the isolation device is connected between the second optical line terminal and the first and second split splitters.
Further, the detection device adopts OTDR.
Further, the pulse transmitting device and the detecting device jointly adopt T-OTDR.
Further, the coupling device and the isolation device both adopt wavelength division multiplexers.
In a second aspect, the present application proposes a passive optical network physical link monitoring method, where the monitoring method is applied to the above-mentioned power passive optical network physical link monitoring system; the method comprises the following steps:
acquiring power and distance corresponding information of optical pulses in a trunk line link and each branch optical fiber link;
drawing a power-distance curve of the light pulse according to the power and distance corresponding information;
based on the power-distance curves of the optical pulses, faults and losses of the trunk link and each branch optical fiber link, and positions where the faults and losses occur, are determined.
Further, the acquiring the power and distance corresponding information of the optical pulse in the trunk line link and each branch optical fiber link includes:
acquiring scattering information and reflection information of the optical pulse in the trunk line link and each branch optical fiber link, and acquiring power and distance corresponding information of the optical pulse in each trunk line link and each branch optical fiber link;
the determining faults and losses of the trunk line link and each branch optical fiber link further comprises: and sending out warning information.
In a third aspect, the present application proposes a non-volatile storage medium, where a program is stored, where when the program runs, the device where the non-volatile storage medium is controlled to execute the above-mentioned passive optical network physical link monitoring method.
In a fourth aspect, the present application proposes an electronic device comprising: the system comprises a memory and a processor, wherein the processor is used for running a program stored in the memory, and the program is used for executing the passive optical network physical link monitoring method when running.
Compared with the prior art, the application has the following beneficial effects:
the utility model provides a passive optical network physical link monitoring system, set up pulse emitter, coupling device and detection device, pulse emitter launches the light pulse of different wavelength, and the wavelength of light pulse corresponds with n optical network units respectively, couples to the optical distribution network through coupling device, and detection device acquires the power and the distance corresponding information of light pulse in trunk line link and each branch fiber link, can know the condition of each position department on trunk line link and each branch fiber link. According to the method and the device, the optical pulses with different wavelengths are used as monitoring signals, the conditions of each optical fiber link and each trunk link are monitored respectively, potential threats of the physical links can be perceived in advance and early warning is carried out, fault points can be positioned in time after sudden accidents are encountered, the running risk of a single ONU is clear, and the daily maintenance and accident emergency repair of the passive optical network link are facilitated.
Drawings
For a clearer description of the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and should therefore not be considered limiting in scope, and that other related drawings can be obtained according to these drawings without the inventive effort of a person skilled in the art.
Fig. 1 is a first block diagram of a passive optical network physical link monitoring system according to an embodiment of the present application;
fig. 2 is a second block diagram of a passive optical network physical link monitoring system according to an embodiment of the present application;
fig. 3 is a third structure diagram of a passive optical network physical link monitoring system according to an embodiment of the present application;
fig. 4 is a schematic flow chart of a method for monitoring a physical link of a passive optical network according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present application, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or an azimuth or a positional relationship that the product of the application is commonly put in use, it is merely for convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
PON has a huge application market and a complex application scenario. It has become increasingly important to improve the reliability of PON, whether in terms of quality or continuity.
Regarding the link monitoring system of the PON, there is no unified and widely used scheme at present, and even in most areas, no effective line protection mechanism is formulated yet. The existing data monitoring technology means mainly generates virtual network topology based on network elements through monitoring host computers, network equipment nodes, user side embedded monitoring equipment and the like, and acquires data state information of a communication network by using a system center manager and adopting a series of network management protocols, so that state sensing and fault positioning of an optical fiber physical link cannot be met.
The PON physical link structure mainly comprises an optical line terminal (Optical Line Terminal, OLT) at the office, an optical network unit (Optical Network Unit, ONU) of the terminal, and an optical distribution network (Optical Distribution Network, ODN). The ODN includes passive devices such as an optical Splitter (Splitter), and does not contain any electronic device or power source, and in the PON, the uplink transmission time is divided into a plurality of time slots, where each time slot corresponds to one ONU. In this way, in the upstream direction, signals of all ONUs can be transmitted to the OLT through one wavelength channel. In the downstream direction, the OLT transmits signals to all ONUs simultaneously, each ONU receives all signals, and then selects only its own slot signal.
Referring to fig. 1, fig. 1 is a first block diagram of a passive optical network physical link monitoring system according to an embodiment of the present application.
The embodiment of the application provides a passive optical network physical link monitoring system, the optical fiber link of passive optical network physical link includes first optical line terminal, optical distribution network and n optical network units, optical distribution network includes n first unequal optical splitters, n is the integer of 1 or more, and monitoring system can include: pulse transmitting device, coupling device and detection device.
The output end of the pulse transmitting device is connected with the output end of the first optical line terminal and is used for transmitting optical pulses with different wavelengths, the wavelengths of the optical pulses respectively correspond to the optical network units, and the optical pulses are not overlapped with the network communication signal wavelengths of the optical network units. And the coupling device is connected to the output end of the optical pulse transmitting device and is used for coupling the optical pulse into the optical wiring network. And the receiving end is connected with the output end of the first optical line terminal and is used for acquiring the power and distance corresponding information of the optical pulses in the trunk line link and the branch optical fiber links corresponding to the optical network units and completing the monitoring of the branch optical fiber links.
In the application, the pulse transmitting device transmits optical pulses with different wavelengths as monitoring signals, so that the optical pulses are not overlapped with the wavelengths of network communication signals of all optical network units in order to avoid influencing normal network communication. The wavelength of the optical pulse corresponds to each optical network unit respectively, so that the application can monitor the branch optical fiber links corresponding to each optical network unit. In addition, the optical pulse monitors each optical network unit and passes through the trunk link, so the application can monitor the trunk link.
The coupling device is used for coupling the optical pulse into the optical distribution network, then the detection device can acquire the corresponding information of the power and the distance of the optical pulse in the trunk line link and each branch optical fiber link, can know whether the trunk line link and each branch optical fiber link have faults or have hidden dangers, and can determine the position information of the faults or the hidden dangers by combining the distance information.
The utility model provides a passive optical network physical link monitoring system, the light pulse and the communication signal coupling of different wavelength to same link, the light pulse and the communication signal that are the monitoring signal do not interfere each other, can accurately monitor the position and the degree that break down or have the hidden danger. The monitoring system can be applied to various passive optical network physical links, has strong universality and is convenient for embodiments.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a physical link monitoring system including a source optical network and a passive optical network according to an embodiment of the present application.
The passive optical network physical link monitoring system provided in this embodiment of the present application takes an electric PON system as an example, and the passive optical network physical link adopts a bidirectional hand protection structure as an example, and is provided with a standby optical fiber link, where the standby optical fiber link includes a second optical line terminal and n second unequal splitters, and may further include a pulse transmitting device, a coupling device, a detecting device, n first wavelength division multiplexers, n second wavelength division multiplexers and an isolating device. In fig. 2, OLT 2 denotes a second optical line terminal, split 1' to split n ' denote second split splitters, OLT 1 denotes a first optical line terminal, split 1 to split n denote n first split splitters, WDM 1 to WDM n denote n first wavelength division multiplexers, WDM 1' to WDM n ' denote n first wavelength division multiplexers, and WDM 0' denotes an isolation device. The Optical Line Terminal (OLT) 1 and the OLT 2 are positioned at two ends of the optical cable of the distribution network, and are respectively connected with the two-port ONU 1 to ONU n and the two OLTs by unequal optical splitters of split 1 to split n and split 1 'to split n', so as to form bidirectional hand protection.
The input ends of the n first wavelength division multiplexers are respectively connected with the output ends of the n first halving optical splitters, and the input ends of the n second wavelength division multiplexers are respectively connected with the output ends of the n second halving optical splitters. One output end of the n first wavelength division multiplexers and one output end of the n second wavelength division multiplexers are respectively connected with n optical network units, the other output end of the n first wavelength division multiplexers are respectively connected with the other ends of the n second wavelength division multiplexers, the allowed passing wavelengths of the first wavelength division multiplexers respectively correspond to the optical pulses transmitted by the pulse transmitting device, and the allowed passing wavelengths of the first wavelength division multiplexers and the second wavelength division multiplexers connected with the same optical network unit are the same.
The method can allocate a special 'monitoring signal wavelength' for each optical network unit, and a monitoring bypass is formed by the first wavelength division multiplexer and the second wavelength division multiplexer of the corresponding wavelengths. The optical network units of the branch optical fiber links are bridged, so that the monitoring signals can bypass the optical network units to reach the standby optical fiber links, and the complete dual-homing protection optical fiber links are in a monitoring state.
In some embodiments of the present application, an isolation device may also be disposed at the second optical line terminal, the isolation device being connected between the second optical line terminal and the first and second split splitters. With the two-way handle protection structure, the monitoring signal input can be avoided at the second optical line terminal side. The specific structure of the isolation device can be selected according to actual needs, and the application is not limited.
In other embodiments of the present application, the coupling device and the isolation device may each be a wavelength division multiplexer, which is convenient for design and application.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a physical link monitoring system including a source optical network and a passive optical network according to an embodiment of the present application.
The passive optical network physical link monitoring system provided in this embodiment of the present application takes an electric PON system as an example, and the passive optical network physical link adopts a bidirectional hand protection structure as an example, and is provided with a standby optical fiber link, where the standby optical fiber link includes a second optical line terminal and n second unequal splitters, and may further include a pulse transmitting device, a coupling device, a detecting device, n first wavelength division multiplexers, n second wavelength division multiplexers and an isolating device.
In practical application, the pulse emitting device can emit light pulses with different wavelengths, the detecting device can correspondingly obtain the corresponding information of the power and the distance of the light pulses in the link, the type and the structure of the device can be selected according to the needs, and the application is not limited.
In some embodiments of the present application, the detection device may use an OTDR (Optical Time Domain Reflectometry, optical time domain reflectometer), and further preferably, the detection device may be integrated with the pulse emitting device, and a T-OTDR (tuneable OTDR, optical time domain reflectometer with Tunable wavelength) may be used. The T-OTDR can measure the optical fiber characteristics of different wavelengths by changing the wavelength of the emitted optical pulse, can be used for analysis and testing of multi-wavelength optical fiber networks, and can be used for more complex measurement and application in the fields of optical fiber communication and sensing. The optical fiber is characterized in that the optical fiber is subjected to various performances such as uniformity, defects, breakage, joint coupling and the like by utilizing Rayleigh scattering and back scattering generated by Fresnel reflection when light rays are transmitted in the optical fiber, when light pulses encounter cracks, breakpoints, joints, bends and the like in the optical fiber propagation process, the light pulses generate abrupt reflection or attenuation, and the information of the reflection or attenuation is captured by an OTDR and used for analyzing the characteristics of the optical fiber. The rayleigh scattering power obtained by OTDR is an exponentially decaying curve showing the loss along the fiber. The OTDR can obtain the power and distance information of the optical fiber by measuring the back-scattering and reflection information in the optical fiber. The T-OTDR equipment independently detects ONU links by changing different wavelengths, and generates a power-distance curve corresponding to a trunk line link and each branch optical fiber link, so as to acquire fault and loss information of each optical fiber link. The method also solves the basic problems encountered by the common OTDR in the point-to-multipoint network monitoring, and can identify different branch users and accurately locate and analyze faults. And (3) deploying a T-OTDR at the side of the OLT 1, wherein the optical pulse is a wavelength-tunable laser source, and the T-OTDR is coupled into an optical distribution network ODN through WDM 0.
The optical pulses do not overlap with the network communication signal wavelengths of the optical network units. As an example, the optical pulse emitted by the T-OTDR may be located in the U-band or the L-band, and the OTDR is used to perform link monitoring, to assist in operation and maintenance and overhaul. Meanwhile, the wavelength of the communication signal is located in the C-band.
As an example, in a power distribution network of 35kV and above, OLT 1, OLT 2 and T-OTDR are deployed at 110kV substations, and ONU are deployed at medium-high voltage distribution network substations, distribution rooms and switching stations to form a hand-in-hand protection structure, and by the monitoring method of the present application, wide-range physical link monitoring of a distribution network passive optical network can be realized. In another example, in a medium-low voltage distribution network with optical cables partially deployed, an OLT 1, an OLT 2 and a T-OTDR are deployed in a 35kV transformer substation, and an ONU is deployed in a ring main unit, an switching station, a 10kV transformer, a distribution room and an electric vehicle charging station to form a hand-in-hand protection structure, so that the monitoring method can realize the monitoring of a physical link of a distribution network passive optical network in a large range.
The method adopts chain topology in the power distribution network, configures corresponding network protection, and is suitable for monitoring the physical links of the passive optical network in various fields. The optical fiber protection switching mechanism is preferably adopted in the power PON system, and the optical fiber link topology is paved according to the dual homing protection. The OLT and PON interfaces of the optical fiber link and the standby optical fiber link are in working states. 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 the standby PON interface can maintain the service attribute of the ONU unchanged in the protection switching process. And the ONU and the OLT both detect the link state and determine whether to switch according to the link state.
Referring to fig. 4, fig. 4 is a flow chart of a method for monitoring a physical link of a passive optical network according to an embodiment of the present application.
The method for monitoring the physical link of the passive optical network provided by the embodiment of the application can comprise the following steps:
s101, acquiring power and distance corresponding information of optical pulses in a trunk line link and each branch optical fiber link.
In practical application, optical pulses with different wavelengths can be emitted, and because the monitoring signal wavelength of each ONU is different, the trunk line link and each branch optical fiber link can be detected respectively, and corresponding information of power and distance can be obtained. If T-OTDR is used, the optical pulses with different wavelengths can be transmitted, and the corresponding information of the power and the distance can be obtained, and the corresponding information of the power and the distance of the optical pulses in each trunk link and each branch optical fiber link can be obtained by obtaining the scattering information and the reflection information of the optical pulses in each trunk link and each branch optical fiber link.
And S102, drawing a power-distance curve of the light pulse according to the power and distance corresponding information.
S103, determining faults and losses of the trunk line link and each branch optical fiber link and positions where the faults and losses occur according to the power-distance curve of the optical pulse.
In some embodiments of the present application, the warning information may be sent out when the fault and the loss occur, and different warning information may be sent out according to the fault and the loss type and the occurrence position.
The embodiment of the application also provides a nonvolatile storage medium, wherein the nonvolatile storage medium stores a program, and the program is used for controlling equipment where the nonvolatile storage medium is located to execute the passive optical network physical link monitoring method.
The above-described nonvolatile storage medium is used to store a program that performs the following functions: acquiring power and distance corresponding information of optical pulses in a trunk line link and each branch optical fiber link; drawing a power-distance curve of the light pulse according to the power and distance corresponding information; based on the power-distance curves of the optical pulses, faults and losses of the trunk link and each branch optical fiber link, and positions where the faults and losses occur, are determined.
The embodiment of the application also provides electronic equipment, which comprises: the system comprises a memory and a processor, wherein the processor is used for running a program stored in the memory, and the program executes the passive optical network physical link monitoring method.
The processor is configured to execute a program that performs the following functions: acquiring power and distance corresponding information of optical pulses in a trunk line link and each branch optical fiber link; drawing a power-distance curve of the light pulse according to the power and distance corresponding information; based on the power-distance curves of the optical pulses, faults and losses of the trunk link and each branch optical fiber link, and positions where the faults and losses occur, are determined.
The foregoing order of embodiments of the present application is merely for illustration, and does not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may 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 may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be essentially or a part contributing to the related art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. The optical fiber link of the physical link of the passive optical network comprises a first optical line terminal, an optical distribution network and n optical network units, wherein the optical distribution network comprises n first unequal optical splitters, and n is an integer greater than or equal to 1; characterized by comprising the following steps:
the output end of the pulse transmitting device is connected with the output end of the first optical line terminal and is used for transmitting optical pulses with different wavelengths, the wavelengths of the optical pulses respectively correspond to the optical network units, and the optical pulses are not overlapped with the network communication signal wavelengths of the optical network units;
the coupling device is connected to the output end of the optical pulse transmitting device and is used for coupling the optical pulse into the optical wiring network;
and the receiving end is connected with the output end of the first optical line terminal and is used for acquiring the power and distance corresponding information of the optical pulses in the trunk line link and the branch optical fiber links corresponding to the optical network units and completing the monitoring of the branch optical fiber links.
2. The power passive optical network physical link monitoring system of claim 1, wherein: the system also comprises n first wavelength division multiplexers and n second wavelength division multiplexers;
the passive optical network physical link adopts a bidirectional hand-held protection structure, and the standby optical fiber link comprises a second optical line terminal and n second unequal optical splitters;
the input ends of the n first wavelength division multiplexers are respectively connected with the output ends of the n first halving optical splitters, and the input ends of the n second wavelength division multiplexers are respectively connected with the output ends of the n second halving optical splitters;
the n first wavelength division multiplexers and the n second wavelength division multiplexers have one output end respectively connected with n optical network units, the other output end of the n first wavelength division multiplexers is respectively connected with the other end of the n second wavelength division multiplexers, the allowed passing wavelength of each first wavelength division multiplexer corresponds to the optical pulse transmitted by the pulse transmitting device, and the allowed passing wavelength of the first wavelength division multiplexer and the second wavelength division multiplexer connected with the same optical network unit is the same.
3. The power passive optical network physical link monitoring system of claim 2, wherein: the device also comprises an isolation device;
the isolation device is connected between the second optical line terminal and the first and second split splitters.
4. A passive optical network physical link monitoring system according to any one of claims 1 to 3, characterized in that: the detection device adopts OTDR.
5. The system for monitoring a physical link of a power passive optical network of claim 4, wherein: the pulse transmitting device and the detecting device jointly adopt T-OTDR.
6. The system for monitoring a physical link of a power passive optical network of claim 5, wherein: the coupling device and the isolation device are both wavelength division multiplexers.
7. A passive optical network physical link monitoring method, wherein the monitoring method is applied to the power passive optical network physical link monitoring system according to any one of claims 1 to 6; the method comprises the following steps:
acquiring power and distance corresponding information of optical pulses in a trunk line link and each branch optical fiber link;
drawing a power-distance curve of the light pulse according to the power and distance corresponding information;
based on the power-distance curves of the optical pulses, faults and losses of the trunk link and each branch optical fiber link, and positions where the faults and losses occur, are determined.
8. The method for monitoring the physical link of the passive optical network according to claim 7, wherein the step of obtaining the power and distance correspondence information of the optical pulses in the trunk link and each branch optical fiber link comprises the steps of:
acquiring scattering information and reflection information of the optical pulse in the trunk line link and each branch optical fiber link, and acquiring power and distance corresponding information of the optical pulse in each trunk line link and each branch optical fiber link;
the determining faults and losses of the trunk line link and each branch optical fiber link further comprises: and sending out warning information.
9. A non-volatile storage medium, wherein a program is stored in the non-volatile storage medium, and wherein the program, when executed, controls a device in which the non-volatile storage medium is located to perform the passive optical network physical link monitoring method according to claim 7 or 8.
10. An electronic device, comprising: a memory and a processor for running a program stored in the memory, wherein the program when run performs the passive optical network physical link monitoring method of claim 7 or 8.
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