Contamination detection method and apparatus for optical module in passive optical network (PON)

Abstract

Provided in the embodiments of the present disclosure are a contamination detection method and apparatus for an optical module in a passive optical network (PON). The method comprises: acquiring a measured transmitted / received optical power value of an optical module in a PON, and acquiring an actual transmitted / received optical power value of the optical module; performing anomaly determination on an information transmission line of the PON on the basis of the difference between the measured transmitted / received optical power value and the actual transmitted / received optical power value, wherein the information transmission line comprises an uplink line and a downlink line; and on the basis of an anomaly determination result, determining whether there is contamination in the optical module.

Description

Method and device for detecting optical module contamination in passive optical network (PON)

[0001] Cross-references to related publications

[0002] The present disclosure is based on Chinese Patent Publication No. 2023112486683, filed on September 25, 2023, entitled “Method and Device for Detecting Contamination of Optical Modules in Passive Optical Networks (PONs)”, and claims the priority of the patent disclosure, and all of its disclosed contents are incorporated into the present disclosure by reference. Technical Field

[0003] The embodiments of the present disclosure relate to the field of communications, and more particularly, to a method and apparatus for detecting contamination of an optical module in a passive optical network (PON). Background Art

[0004] In the XPON network of the Passive Optical Network (PON), the common networking system consists of a network management server, an optical line terminal (OLT), an optical distribution network (ODN), and several optical network units (ONUs). The OLT, as a central office device, connects and aggregates multiple ONU devices through the ODN network using PON ports as units. The ONU devices enable user service access, thereby realizing functions such as data services and configuration management.

[0005] The central office (OLT) sends data via downlink broadcasts using the optical modules of the PON line cards. Multiple end-point devices (ONTs) transmit data via uplink channels within corresponding time slots. Both upstream and downstream data are transmitted in the form of optical signals. Therefore, data transmission quality is strongly correlated with the optical modules that transmit and receive data, as well as the quality and status of the ODN transmission network. After the ODN network is constructed, its network status is generally considered to be normal. The transmit optical power and receive sensitivity of the optical module directly affect the quality of the optical signal.

[0006] In practice, to ensure service quality, the luminous power of the corresponding PON port (i.e., the central office optical module) is typically measured on-site to ensure that it reaches a certain intensity. However, central office optical modules are easily contaminated during construction or maintenance, resulting in dirty end faces. This can lead to reduced transmitted optical power or poor receiving sensitivity, necessitating appropriate measures in PON and similar systems. Furthermore, because checking the cleanliness of optical module end faces typically requires specialized instruments (e.g., end-face inspection mirrors), implementation efficiency is low and costs are high.

[0007] Summary of the Invention

[0008] The embodiments of the present disclosure provide a method and apparatus for detecting damage to an optical module in a passive optical network (PON), so as to at least solve the problem that a method of directly determining whether an optical module is damaged is difficult and inefficient.

[0009] According to one embodiment of the present disclosure, a method for detecting contamination of an optical module in a passive optical network (PON) is provided, comprising: obtaining a detection value of the transmitted and received optical power of an optical module in the passive optical network (PON), and obtaining an actual value of the transmitted and received optical power of the optical module; performing an abnormality judgment on an information transmission line of the PON based on a difference between the detection value of the transmitted and received optical power and the actual value of the transmitted and received optical power, wherein the information transmission line includes an uplink line and a downlink line; and determining whether the optical module is damaged based on a result of the abnormality judgment.

[0010] According to another embodiment of the present disclosure, a device for detecting contamination of an optical module in a passive optical network (PON) is provided, comprising: a processing module configured to obtain a detection value of the received and received optical power of an optical module in the passive optical network (PON), and to obtain an actual value of the received and received optical power of the optical module; a judgment module configured to perform an abnormality judgment on an information transmission line of the PON based on a difference between the detection value of the received and received optical power and the actual value of the received and received optical power, wherein the information transmission line includes an uplink line and a downlink line; and a determination module configured to determine whether the optical module is damaged based on a result of the abnormality judgment.

[0011] According to another embodiment of the present disclosure, a computer-readable storage medium is provided, in which a computer program is stored. The computer program is configured to execute the steps of any one of the above method embodiments when running.

[0012] According to another embodiment of the present disclosure, an electronic device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to perform the steps in any one of the above method embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] 1 is a hardware structure block diagram of a computer terminal of a method for detecting optical module contamination in a passive optical network (PON) according to an embodiment of the present disclosure;

[0014] FIG2 is a diagram of a system for detecting contamination of an optical module in a passive optical network (PON) according to an embodiment of the present disclosure;

[0015] 3 is a flow chart of a method for detecting contamination of an optical module in a passive optical network PON according to an embodiment of the present disclosure;

[0016] FIG4 is a structural block diagram of a device for detecting contamination of an optical module in a passive optical network PON according to an embodiment of the present disclosure;

[0017] FIG5 is a flowchart of a method for detecting optical module contamination in a passive optical network (PON) according to yet another embodiment of the present disclosure. DETAILED DESCRIPTION

[0018] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings and in conjunction with embodiments.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0020] The method embodiments provided in the embodiments of the present disclosure can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a computer terminal as an example, FIG1 is a hardware structure block diagram of a computer terminal of a method for detecting contamination of an optical module in a passive optical network PON according to an embodiment of the present disclosure. As shown in FIG1 , the computer terminal may include one or more (only one is shown in FIG1 ) processors 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 configured to store data, wherein the above-mentioned computer terminal may also include a transmission device 106 and an input and output device 108 configured to have a communication function. It will be understood by those skilled in the art that the structure shown in FIG1 is only for illustration and does not limit the structure of the above-mentioned computer terminal. For example, the computer terminal may also include more or fewer components than those shown in FIG1 , or have a configuration different from that shown in FIG1 .

[0021] Memory 104 can be configured to store computer programs, such as software programs and modules for application software, such as the computer program corresponding to the method for detecting optical module contamination in a passive optical network (PON) in the embodiments of the present disclosure. Processor 102 executes the computer program stored in memory 104 to perform various functional applications and data processing, thereby implementing the aforementioned method. Memory 104 can include high-speed random access memory (RAM) and can also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, memory 104 can further include memory remotely located relative to processor 102, and such remote memory can be connected to a computer terminal via a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0022] The transmission device 106 is configured to receive or transmit data via a network. A specific example of the aforementioned network may include a wireless network provided by a communications provider of a computer terminal. In one embodiment, the transmission device 106 includes a network interface controller (NIC) that can be connected to other network devices via a base station to enable communication with the Internet. In another embodiment, the transmission device 106 may be a radio frequency (RF) module that is configured to communicate with the Internet wirelessly.

[0023] The embodiments of the present disclosure can run on the passive optical network system shown in Figure 2. As shown in Figure 2, the system includes an element management system (EMS) 100, an optical line terminal (OLT) 200, an optical distribution network (ODN) 300, and an optical network unit (ONU) 400.

[0024] EMS 100 is configured to configure, manage, and maintain the OLT 200 and xPON network. The EMS manages and maintains historical information, alarms, and notifications for the OLT 200 and ONU 400. Based on these alarms and notifications, it can identify specific abnormal ONUs and locate their physical locations.

[0025] OLT 200 is configured to initiate ONU discovery, assign a link identifier to ONU 400, complete ONU 400 registration and authentication on OLT 200, and allocate an upstream timeslot to ONU 400. ONU 400 then uploads data in the timeslot assigned by OLT 200. Normally, each upstream timeslot is exclusively occupied by that ONU. OLT 200 maintains a table of ONU online history information on a per-PON basis. It triggers long-duration detection based on RTT drift or ONU upstream error alarms and uses relevant strategies to locate the long-duration ONU.

[0026] The ODN 300 is configured to connect different numbers of ONUs 400 under the OLT 200 and serves as a direct physical connection channel between the OLT 200 and the ONUs 400. The ODN 300 may be composed of a combination of multiple physical devices.

[0027] ONU 400 is configured to act as a terminal device for a home user, accepts the management of OLT 200, accepts the link identifier assigned by OLT 200 during the registration process, and uploads data in the time slot window uniformly assigned by OLT 200 to complete the service.

[0028] The embodiments of the present disclosure relate to any communication technology or system of a PON that adopts a point-to-multipoint (PToMP) topology in an access network. The use of a point-to-multipoint topology is a significant feature of a passive optical network system, and according to the working mechanism, it can be divided into Ethernet-based passive optical network equipment (EPON, Ethernet Passive Optical Network), Gigabit-capable Passive Optical Network equipment (G-PON, Gigabit-capable Passive Optical Network) and passive optical network equipment with other working mechanisms; these passive optical network equipment systems have the same architecture and all include OLT and ONU, wherein the OLT device completes the aggregation of multiple ONU devices through the PON port, that is, constitutes a point (OLT) to multipoint (ONU) topology. The above-mentioned PON technologies are collectively referred to as xPON.

[0029] FIG3 is a flow chart of a method for detecting contamination of an optical module in a passive optical network (PON) according to an embodiment of the present disclosure. As shown in FIG3 , the flow includes the following steps:

[0030] Step S302, obtaining a detected value of the transmitted and received optical power of an optical module in a passive optical network PON, and obtaining an actual value of the transmitted and received optical power of the optical module;

[0031] In an exemplary embodiment of the present disclosure, a method for obtaining a received and received optical power detection value of an optical module in a PON includes obtaining the received and received optical power detection value based on multiple monitoring points inside the optical module and re-detecting after a network change.

[0032] Step S304: determining an abnormality of an information transmission line of the PON based on a difference between the detected value of the received and received optical power and the actual value of the received and received optical power, wherein the information transmission line includes an uplink line and a downlink line;

[0033] In step S304 of this embodiment, the abnormality judgment is performed on the information transmission line of the PON based on the difference between the received and received optical power detection value and the actual received and received optical power value, including: determining whether the uplink line has an abnormality based on the difference between the received and received optical power detection value of the uplink line and the actual received and received optical power value of the uplink line, and determining whether the downlink line has an abnormality based on the difference between the received and received optical power detection value of the downlink line and the actual received and received optical power value of the downlink line.

[0034] In an exemplary embodiment, determining whether there is an abnormality in the downlink line based on the difference between the received and received optical power detection value of the downlink line and the actual received and received optical power value of the downlink line includes: comparing a third difference value obtained by subtracting the actual received optical power value of the downlink line from the received optical power detection value of the downlink line with a third threshold value, and when the third difference value is greater than the third threshold value, determining that there is an abnormality in the downlink line; determining whether there is an abnormality in the downlink line based on the difference between the received and received optical power detection value of the uplink line and the actual received and received optical power value of the downlink line includes: comparing a fourth difference value obtained by subtracting the received optical power detection value of the uplink line from the actual received optical power value of the uplink line with a fourth threshold value, and when the fourth difference value is greater than the fourth threshold value, determining that there is an abnormality in the uplink line.

[0035] Step S306: Determine whether the optical module is damaged according to the result of the abnormality determination.

[0036] Step S306 of this embodiment includes determining whether the optical module is damaged according to whether both the uplink and the downlink have abnormalities.

[0037] In an exemplary embodiment, determining whether the optical module is damaged based on whether both the uplink and the downlink are abnormal includes: for a multi-channel PON, when the uplink or the downlink of a channel with a transmission rate less than a first threshold is normal and both the uplink and the downlink of a channel with a transmission rate greater than the first threshold are abnormal, determining whether the optical module is damaged based on a status of the optical module or a status of a port of the optical module; and terminating the determination of whether the optical module is damaged when both the uplink and the downlink of the channel with a transmission rate less than the first threshold are abnormal and the uplink or downlink of the channel with a transmission rate greater than the first threshold is normal; for a single-channel PON, determining that the optical module is not damaged when the uplink or the downlink is normal; and for a multi-channel PON or a single-channel PON, determining whether the optical module is damaged based on the status of the optical module or the status of the port of the optical module when both the uplink and the downlink are abnormal.

[0038] The multi-channel PON in this embodiment includes 1GPON, 10GPON and higher-speed PON. For multi-channel PON, it is necessary to judge whether the uplink and downlink of different speeds (PON wavelength) are normal respectively. When the result of the low-speed PON is normal and the result of the high-speed PON is abnormal, it means that the high-speed channel is abnormal. The status of the optical module or the status of the port of the optical module is used to judge whether the optical module is damaged; when the result of the low-speed PON is abnormal and the result of the high-speed PON is normal, it is not judged whether it is damaged.

[0039] It should be noted that the method for determining whether an optical module is contaminated in the embodiment of the present disclosure can be applied to an OLT and an ONU, and the determination method is similar.

[0040] In an exemplary embodiment, whether the optical module is damaged is determined by the status of the optical module or the status of the port of the optical module, including: comparing the difference between the physical online time of the optical module and the online time of the optical network unit ONU associated with the optical module with a second threshold, and determining that the optical module is damaged when the difference is greater than the second threshold; or comparing the average distance difference of the link between the optical module and the ONU associated with the optical module with a third threshold, and determining that the optical module is damaged when the average distance difference is less than the third threshold.

[0041] In an exemplary embodiment, obtaining the received and received optical power detection value of the optical module in the PON and obtaining the actual value of the received and received optical power of the optical module include: obtaining the received optical power detection value of the downlink line through a remote management channel, and calculating the actual value of the transmitted optical power of the downlink line; wherein, the actual value of the transmitted optical power of the optical line terminal OLT of the downlink line = the received optical power detection value of the ONU of the downlink line + the downlink line attenuation; wherein, the downlink line attenuation = splitter insertion loss + line distance * downlink line loss coefficient.

[0042] In an exemplary embodiment, obtaining the received and received optical power detection value of the optical module in the PON and obtaining the actual value of the received and received optical power of the optical module include: obtaining the transmitted optical power detection value of the uplink line through a remote management channel, and calculating the actual value of the received optical power of the uplink line; wherein, the actual value of the received optical power of the OLT of the uplink line = the transmitted optical power detection value of the ONU of the uplink line - the uplink line attenuation; wherein, the uplink line attenuation = splitter insertion loss + line distance * uplink line loss coefficient.

[0043] In an exemplary embodiment, when it is determined that the optical module is damaged, the damage information of the optical module is reported to a network management system via an alarm or notification message.

[0044] Through the disclosed embodiments, by obtaining the detected and actual values ​​of the optical module's transmit and receive optical power in the PON, it is possible to determine whether there are abnormalities in the PON's uplink and downlink lines based on the difference between the detected and actual values, thereby obtaining the results of the uplink and downlink abnormality determination. Finally, based on the determination results, it is determined whether the optical module is damaged. The disclosed embodiments utilize the acquisition and calculation of optical module-related data to determine whether the optical module is damaged, eliminating the need for manual determination. Therefore, the difficulty and low efficiency of directly determining whether an optical module is damaged are resolved, thereby achieving the effect of easily determining whether an optical module is damaged by determining whether the PON's transmission line is abnormal.

[0045] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus the necessary general hardware platform, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present disclosure is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), including a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present disclosure.

[0046] This embodiment also provides a device for detecting contamination of optical modules in a passive optical network (PON). This device is configured to implement the aforementioned embodiments and preferred implementations, and details already described will not be repeated. As used below, the term "module" may refer to a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation using hardware, or a combination of software and hardware, is also possible and contemplated.

[0047] FIG4 is a structural block diagram of an optical module contamination detection device in a passive optical network (PON) according to an embodiment of the present disclosure. As shown in FIG4 , the network intelligent monitoring device 400 includes: a processing module 10 , a judgment module 20 , and a determination module 30 .

[0048] The processing module 10 is configured to obtain a detection value of the optical power transmitted and received by an optical module in a passive optical network PON, and obtain an actual value of the optical power transmitted and received by the optical module;

[0049] a judgment module 20 configured to judge an abnormality of an information transmission line of the PON based on a difference between the detected value of the received and received optical power and the actual value of the received and received optical power, wherein the information transmission line includes an uplink line and a downlink line;

[0050] The determination module 30 is configured to determine whether the optical module is damaged according to the result of the abnormality determination.

[0051] It should be noted that the above modules can be implemented through software or hardware. For the latter, it can be implemented in the following ways, but not limited to: the above modules are all located in the same processor; or the above modules are located in different processors in any combination.

[0052] To facilitate understanding of the technical solutions provided by the present disclosure, embodiments of the present disclosure will be described in detail below with reference to specific scenarios.

[0053] FIG5 is a flow chart of a method for detecting contamination of an optical module in a passive optical network (PON) according to another embodiment of the present disclosure. As shown in FIG5 , the method includes the following steps:

[0054] Step S502: The OLT obtains optical module information and PON port status information;

[0055] The optical module information includes but is not limited to the optical module model, serial number (SN), optical module receive / transmit power indicators (for multi-channel optical modules, the receive / transmit power indicators of each channel are obtained), and the time when the optical module was first put online.

[0056] The PON port status information includes but is not limited to the generation and recovery time of a PON port alarm (such as PON LOS), and ONU registration information (including ONU type, number of online ONUs, and registration distance of each ONU).

[0057] Step S504: The OLT measures the optical power transmitted and received by the PON port.

[0058] Specifically, the PON device obtains the transmit and receive optical power of the relevant optical module based on the internal monitoring point of the optical module (central office / terminal); and re-detects after the corresponding ODN network changes. For example, for the central office optical module, re-detection is performed after the PON LOS alarm is detected and restored; for the terminal optical module, re-detection is performed after the PON LOSi is detected and restored or the network is back online.

[0059] Furthermore, after the ODN network changes, a counter Couter1 is set, wherein Couter1 can be set manually, and the default value is 3.

[0060] It should be noted that for OLT equipment, the equipment detects the optical power Toltx (downstream direction) sent by the optical module based on the PON port, and the optical power Roltx (upstream direction) received by the OLT side based on each ONUx under the PON port.

[0061] For multi-channel optical modules, the transmit optical power and receive optical power of each channel involved are measured at the central office. The multiple channels include but are not limited to 1GPON / 10GPON / 50GPON, etc.

[0062] For the ONT device, the device detects the transmit optical power Tonux (upstream direction) and receive optical power Ronux (downstream direction) of its PON port optical module.

[0063] Step S506: The OLT calculates the actual transmit and receive optical power of the PON port.

[0064] Specifically, the optical power transmitted and received by the opposite-end device is obtained, and the actual optical power transmitted / received by the local-end device is calculated in combination with the ODN information.

[0065] The OLT obtains the transmit and receive optical power on the ONU side and calculates the actual transmit and receive optical power of the OLT / ONU based on the ODN information.

[0066] It should be noted that this embodiment only describes the calculation method of the actual transmitted optical power and the actual received optical power of the OLT. The calculation method of the actual transmitted optical power and the actual received optical power of the ONU is similar to that of the OLT.

[0067] The OLT obtains the received optical power Ronux of the ONU corresponding to each PON port through the remote management channel, and reversely calculates the actual transmitted optical power T'oltx = Ronux + downstream line attenuation based on the ONU registration information.

[0068] Wherein, downlink line attenuation = splitter insertion loss + downlink line loss = splitter insertion loss + line distance * downlink line loss coefficient.

[0069] The remote management channel includes but is not limited to: an extended OAM channel of EPON and an OMCI channel of GPON.

[0070] The OLT obtains the transmit optical power Tonux of the ONU under the corresponding PON port through the remote management channel (including but not limited to: the extended OAM channel of EPON and the OMCI channel of GPON), and reversely calculates the actual receive optical power R'oltx = Tonux - upstream line attenuation based on the ONU registration information.

[0071] Wherein, uplink line attenuation = splitter insertion loss + uplink line loss = splitter insertion loss + line distance * uplink line loss coefficient;

[0072] Step S508, setting a threshold and determining whether the downlink direction is normal;

[0073] Specifically, a threshold is set based on the actual optical power of the local end, and whether the downlink direction is normal is determined according to the threshold.

[0074] The threshold is calculated based on the nominal transmit and receive optical power ranges of different optical module types. The calculation method includes but is not limited to the following:

[0075] Static setting, set for the entire optical module according to the nominal value of the optical module type: Transmit threshold = (current measured average optical power - nominal minimum transmit optical power of this type of optical module) * N, where N is a percentage and the default is 50%.

[0076] Receiving threshold = (current measured average optical power - the nominal minimum receiving optical power of this type of optical module) * N, where N is a percentage and the default value is 50%.

[0077] Dynamic setting is set for each terminal according to the corresponding optical path attenuation of the PON port, that is, the OLT's transmit and receive thresholds for different ONUs are dynamically set: threshold = corresponding optical path full line attenuation * M, where M is a percentage, the default is 10%.

[0078] The OLT determines whether there are any abnormalities in the downstream direction (or in each channel) based on the optical power measured by the OLT and the actual optical power. The method for determining whether an ONU is abnormal is similar to that of the OLT. The specific judgment method is as follows:

[0079] (1) Set and maintain the threshold Threshold1 and the counter Nab (Nab is initialized to 0). When Toltx-T'oltx>Threshold1, it is considered that there is an abnormality in the downstream direction of branch X, and Nab=Nab+1.

[0080] Traverse all ONUx under the corresponding PON port, update and assign Nab.

[0081] Furthermore, when the optical module corresponding to the PON port of the OLT is online for the first time, Nab is initialized to 0. The system detects the optical module presence information based on the PON port. When the optical module is offline, the OLT starts the timer T based on the PON port. opti , and set the timeout period. After the optical module comes back online, stop the timer T opti The timing is initialized and matched according to the optical module SN and other information. If the optical module information does not match (i.e., the optical module is replaced), Nab is reinitialized to 0.

[0082] When the optical module information matches, according to the timer T opti Whether Nab is reinitialized to 0 after timeout: When the timer T opti Timeout, initialize Nab to 0; when timer T opti If it does not time out, the current Nab value is maintained.

[0083] Furthermore, the optical power difference is calculated based on the channel type supported by the PON module and the downstream ONU type, and a corresponding threshold Threshold1n and counter Nabn are set and maintained for each channel.

[0084] (2) Set thresholds Threshold 2 and Threshold 3. When Nab > Threshold 2 or the number of online ONUs at the Nab / PON port > Threshold 3, it is determined that there is an abnormality in the downstream OLT trunk fiber of the corresponding PON port.

[0085] Specifically, multi-channel thresholds Threshold2n and Threshold3n are set. When Nabn>Threshold2n or the number of online ONUs in the corresponding channel under the Nabn / PON port is>Threshold3n, it is determined that there is an abnormality in the downstream of the OLT trunk optical fiber in this channel; further, when there are abnormalities in the downstream of all channels (or it is determined that there are abnormalities in the downstream of multiple channels based on the ratio), it is determined that there is an abnormality in the downstream of the OLT trunk optical fiber corresponding to the PON port.

[0086] Step S510, setting a threshold and determining whether the uplink direction is normal;

[0087] Specifically, the threshold is calculated based on the nominal transmit and receive optical power ranges of different optical module types. The calculation method includes but is not limited to the following:

[0088] Static setting, set for the entire optical module according to the nominal value of the optical module type: Transmit threshold = (current measured average optical power - nominal minimum transmit optical power of this type of optical module) * N, where N is a percentage and the default is 50%.

[0089] Receiving threshold = (current measured average optical power - the nominal minimum receiving optical power of this type of optical module) * N, where N is a percentage and the default value is 50%.

[0090] Dynamic setting is set for each terminal according to the optical path loss corresponding to the PON port, that is, the OLT's sending and receiving thresholds for different ONUs are dynamically set.

[0091] Threshold = corresponding optical path attenuation*M, where M is a percentage and the default value is 10%.

[0092] It should be noted that this embodiment only describes the calculation method of the OLT-related thresholds, and the calculation method of the ONU-related thresholds is similar to that of the OLT.

[0093] The OLT determines whether there is an abnormality in the upstream direction (or each channel) based on the OLT measured optical power and actual optical power. The methods include but are not limited to:

[0094] (1) Set and maintain the threshold Threshold4 and the counter Mab (Mab is initialized to 0). When R'oltx-Roltx>Threshold4, it is considered that there is an abnormality in the upstream direction of branch X, and Mab=Mab+1, and Mab is initialized to 0.

[0095] Traverse all ONUx under the corresponding PON port, update and assign Mab.

[0096] Furthermore, when the optical module corresponding to the PON port of the OLT is online for the first time, Mab is initialized to 0. The system detects the optical module presence information based on the PON port. When the optical module is offline, the OLT starts the timer T based on the PON port. opti , and set the timeout period. After the optical module comes back online, stop the timer T opti Timing and initialization, matching based on optical module SN and other information. If the optical module information does not match (i.e., the optical module is replaced), Mab is reinitialized to 0;

[0097] When the optical module information matches (i.e. the optical module has not changed), according to the timer T opti Whether it times out, determine whether Mab is reinitialized to 0: When the timer T opti Timeout, initialize Mab to 0; when timer T opti If it does not time out, the current Mab value is maintained.

[0098] (2) Set thresholds Threshold 5 and Threshold 6. When Mab > Threshold 5 or the number of online ONUs under the Mab / PON port > Threshold 6, it is determined that there is an abnormality in the upstream of the OLT trunk fiber;

[0099] Furthermore, multi-channel thresholds Threshold5n and Threshold6n are set. When Mabn>Threshold5n or the number of online ONUs in the corresponding channel under Mabn / PON port>Threshold6n, it is determined that there is an abnormality in the upstream of the OLT trunk optical fiber of the corresponding PON port; further, when there is an abnormality in the upstream direction of all channels (or according to a certain strategy, such as judging that there are abnormalities in multiple channels based on the ratio), it is determined that there is an abnormality in the upstream of the OLT trunk optical fiber of the corresponding PON port.

[0100] Step S512, determining whether the optical module is damaged;

[0101] (1) If the upstream / downstream of the OLT trunk optical fiber is not judged to be abnormal at the same time, it is judged that the non-OLT optical module is contaminated;

[0102] (2) When an abnormality is detected in both the upstream and downstream directions of the OLT trunk optical fiber, the status of the corresponding PON port / optical module is combined to determine whether the corresponding optical module is damaged. The status of the PON port / optical module includes but is not limited to:

[0103] Set and maintain the threshold Threshold 7. If the difference between the time when the optical module of the corresponding PON port is online and the time when the first ONU connected to the PON port comes online is greater than Threshold 7, the corresponding OLT optical module is considered to be damaged.

[0104] Set and maintain the threshold Threshold 8. If a PON LOS alarm occurs on the corresponding PON port and is restored, and the distance between the ONUs on the PON port does not change significantly (including but not limited to the average distance difference between the online ONUs and the OLT before and after the PON LOS occurs is less than Threshold 8), the corresponding OLT optical module is considered to be damaged.

[0105] It should be noted that this embodiment only describes whether the OLT side optical module is damaged. The method for determining whether the ONU side optical module is damaged is similar to that for the OLT.

[0106] Step S514: Report an alarm or notification.

[0107] Specifically, the above-mentioned optical module contamination is reported to the network management or other operation and maintenance platform through an alarm or notification message. According to a certain strategy and combined with user account information, the installation of new users (ONUs) is actively restricted or the specific location is found and handled on site.

[0108] An embodiment of the present disclosure further provides a computer-readable storage medium, in which a computer program is stored. The computer program is configured to execute the steps of any one of the above method embodiments when run.

[0109] In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk, or an optical disk.

[0110] An embodiment of the present disclosure further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to perform the steps in any of the above method embodiments.

[0111] In an exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0112] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail here.

[0113] Obviously, those skilled in the art should understand that the modules or steps of the present disclosure described above can be implemented using a general-purpose computing device, they can be concentrated on a single computing device, or distributed across a network composed of multiple computing devices, they can be implemented using program code executable by the computing device, and thus, they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be performed in a different order than herein, or they can be fabricated into separate integrated circuit modules, or multiple modules or steps can be fabricated into a single integrated circuit module for implementation. Thus, the present disclosure is not limited to any particular combination of hardware and software.

[0114] The foregoing description is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations of the present disclosure are possible. Any modifications, equivalent substitutions, or improvements made within the principles of the present disclosure shall be included within the scope of protection of the present disclosure.

Claims

1. A method for detecting contamination of an optical module in a passive optical network PON, comprising: Obtaining a detection value of the transmit / receive light power of an optical module in a passive optical network PON, and obtaining an actual value of the transmit / receive light power of the optical module; Based on the difference between the received and received optical power detection value and the received and received optical power actual value, an abnormality judgment is made on the information transmission line of the PON, wherein the information transmission line includes an uplink line and a downlink line; Determine whether the optical module is contaminated according to the result of the abnormality judgment.

2. The method according to claim 1, wherein: Determining whether the optical module is damaged according to the result of the abnormality judgment includes: Whether the optical module is damaged is determined according to whether both the uplink line and the downlink line are abnormal.

3. The method according to claim 2, wherein: Judging whether the optical module is damaged according to whether the uplink line and the downlink line are abnormal at the same time includes: For a multi-channel PON, when the uplink or downlink of the channel with a transmission rate less than a first threshold is normal, and the uplink and downlink of the channel with a transmission rate greater than the first threshold are both abnormal, determine whether the optical module is damaged by the state of the optical module or the state of the port of the optical module; when the uplink and downlink of the channel with a transmission rate less than the first threshold are both abnormal, and the uplink or downlink of the channel with a transmission rate greater than the first threshold is normal, the determination of whether the optical module is damaged is terminated; For a single-channel PON, when the uplink or the downlink is normal, determining that the optical module is not damaged; For the multi-channel PON and the single-channel PON, when both the uplink and the downlink are abnormal, it is determined whether the optical module is contaminated by the state of the optical module or the state of the port of the optical module.

4. The method according to claim 3, wherein: Judging whether the optical module is damaged according to the state of the optical module or the state of the port of the optical module includes: Compare the difference between the physical online time of the optical module and the online time of the optical network unit ONU associated with the optical module with a second threshold, and determine that the optical module is damaged if the difference is greater than the second threshold; or The average distance difference of the link between the optical module and the ONU associated with the optical module is compared with a third threshold, and when the average distance difference is smaller than the third threshold, it is determined that the optical module is damaged.

5. The method according to claim 1, wherein: The abnormality judgment is performed on the information transmission line of the PON based on the difference between the received and received optical power detection value and the received and received optical power actual value, including: Determine whether the uplink line is abnormal based on the difference between the received and received optical power detection value of the uplink line and the actual value of the received and received optical power of the uplink line, and determine whether the uplink line is abnormal based on the difference between the received and received optical power detection value of the downlink line and the received and received optical power of the downlink line. The difference in the actual value of the luminous power determines whether there is an abnormality in the downlink.

6. The method according to claim 5, wherein: Determining whether there is an abnormality in the downlink based on the difference between the transmitted and received optical power detection value of the downlink and the actual value of the transmitted and received optical power of the downlink, comprising: comparing a third difference value obtained by subtracting the actual value of the transmitted optical power of the downlink from the transmitted optical power detection value of the downlink with a third threshold value, and determining that there is an abnormality in the downlink when the third difference value is greater than the third threshold value; Determining whether there is an abnormality in the downlink line based on the difference between the received and received optical power detection value of the uplink line and the received and received optical power actual value of the downlink line includes: comparing a fourth difference value obtained by subtracting the received optical power detection value of the uplink line from the actual received optical power value of the uplink line with a fourth threshold value, and when the fourth difference value is greater than the fourth threshold value, determining that there is an abnormality in the uplink line.

7. The method according to any one of claims 1 to 6, wherein: Obtaining the detected value of the transmitted and received optical power of the optical module in the PON, and obtaining the actual value of the transmitted and received optical power of the optical module, including: Obtaining a received optical power detection value of the downlink line through a remote management channel, and calculating an actual value of a transmitted optical power of the downlink line; Wherein, the actual value of the transmitted optical power of the optical line terminal OLT of the downlink line = the detected value of the received optical power of the ONU of the downlink line + the downlink line attenuation; Wherein, the downlink line attenuation=splitter insertion loss+line distance*downlink line loss coefficient.

8. The method according to any one of claims 1 to 6, wherein: Obtaining the detected value of the optical power of the optical module in the PON, and obtaining the actual value of the optical power of the optical module, including: Obtaining a transmission optical power detection value of the uplink line through a remote management channel, and calculating an actual value of the reception optical power of the uplink line; Wherein, the actual value of the received optical power of the OLT of the uplink line = the detected value of the sent optical power of the ONU of the uplink line - the uplink line attenuation; The uplink line attenuation=splitter insertion loss+line distance*uplink line loss coefficient.

9. The method according to claim 1, wherein: Also includes: When it is determined that the optical module is damaged, the damage information of the optical module is reported to the network management through an alarm or a notification message.

10. A device for detecting contamination of an optical module in a passive optical network (PON), comprising: A processing module is configured to obtain a detection value of the optical power of an optical module in a passive optical network PON, and obtain an actual value of the optical power of the optical module; A judgment module, configured to judge an abnormality of an information transmission line of the PON based on a difference between the received and received optical power detection value and the received and received optical power actual value, wherein the information transmission line includes an uplink line and a downlink line; The determination module is configured to determine whether the optical module is damaged according to the result of the abnormality determination.

11. A computer-readable storage medium having a computer program stored therein, wherein: When the computer program is executed by a processor, the steps of the method described in any one of claims 1 to 6 are implemented.

12. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in any one of claims 1 to 6 when executing the computer program.

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