Method for detecting injection locking risk of passive optical network, electronic device, readable medium, and computer program product

Abstract

The present disclosure provides a method for detecting an injection locking risk of a passive optical network (PON), comprising: measuring a first transmission quality of an uplink of a first PON; when the first transmission quality does not satisfy a preset condition, adjusting a downlink transmission parameter of a second PON; measuring a second transmission quality of the uplink; and when the second transmission quality is better than the first transmission quality, determining that an optical network unit (ONU) corresponding to the uplink has an injection locking risk caused by the second PON. The embodiments of the present disclosure provide a method for detecting an injection locking risk caused by the second PON to the ONU, thereby solving the problem of mode competition between the second PON and the first PON, and improving the quality of an uplink transmission signal of the first PON. The present disclosure further provides an electronic device, a readable medium, and a computer program product.

Description

Passive optical network injection lockout risk detection methods, electronic devices, readable media and computer program products

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510378826.X, filed with the China Patent Office on March 27, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to, but is not limited to, the field of optical communication technology. Background Technology

[0004] Passive Optical Network (PON) is a communication network formed by connecting a number of optical network terminals (ONTs) or multiple optical network units (ONUs) through an optical distribution network (ODN). With the large-scale application of big data, cloud computing, and the Internet of Things (IoT), and driven by new services (such as telemedicine, intelligent industrial manufacturing, and factory communications), data traffic is increasing exponentially, placing higher demands on network bandwidth. Currently, it is widely accepted to increase the bandwidth of next-generation optical access networks to 50Gbps to gradually replace some 10G EPON (Ethernet Passive Optical Network) and EPON equipment. Therefore, how to achieve a smooth evolution of system bandwidth simply and efficiently has become a hot research topic in the PON field.

[0005] The current 50G PON standard defines a downlink wavelength of 1342nm. However, downlink light at this wavelength, reflected back to the OLT port in the ODN, will enter the EPON and 10G EPON uplink receivers, causing packet loss or even outages for EPON and 10G EPON services. Therefore, considering the coexistence of broadband tri-mode EPON, the 50G PON downlink wavelength needs to avoid the EPON uplink wavelength and the asymmetric, non-narrowed uplink wavelength distribution range of 1260-1360nm of 10G EPON to prevent conflicts with EPON and 10G EPON uplink services.

[0006] Considering the impact of fiber loss and dispersion, a wavelength of 1370nm, which is close to 1360nm, is a feasible option. However, the 1370nm downlink wavelength scheme for 50G PON carries the risk of uplink injection lockout. Therefore, how to detect the uplink injection lockout risk of the 50G PON downlink wavelength has become an urgent problem to be solved. Summary of the Invention

[0007] This disclosure provides a method for detecting injection lockout risk in passive optical networks, an electronic device, a readable medium, and a computer program product.

[0008] In a first aspect, embodiments of this disclosure provide a method for detecting injection lockout risk in a passive optical network, including:

[0009] Test the first transmission quality of the uplink of the first passive optical network (PON);

[0010] If the first transmission quality does not meet the preset conditions, adjust the downlink transmission parameters of the second PON;

[0011] Detect the second transmission quality of the uplink;

[0012] If the second transmission quality is better than the first transmission quality, it is determined that the optical network unit (ONU) corresponding to the uplink is subject to the second PON injection lockout risk.

[0013] Secondly, embodiments of this disclosure provide a method for detecting injection lockout risk in a passive optical network, including:

[0014] Test the first transmission quality of the uplink of the first passive optical network (PON);

[0015] If the first transmission quality does not meet the preset conditions, the link loss of the uplink of the first PON is detected.

[0016] If the link loss is less than a preset first threshold, it is determined that the optical network unit (ONU) corresponding to the uplink has a second PON injection lockout risk.

[0017] Thirdly, embodiments of this disclosure provide an electronic device, including a memory and a processor; the memory stores a computer program that can be executed by the processor, and when the computer program is executed by the processor, it implements the passive optical network injection lock-in risk detection method.

[0018] Fourthly, embodiments of this disclosure provide a computer-readable medium having a computer program stored thereon, which, when executed by a processor, implements the passive optical network injection lock-in risk detection method.

[0019] Fifthly, embodiments of this disclosure provide a computer program product, which includes a computer program that, when executed by a processor, implements the passive optical network injection lock-in risk detection method. Attached Figure Description

[0020] In the accompanying drawings of the embodiments disclosed herein:

[0021] Figure 1 illustrates the uplink injection lock-in risk of the 50G PON downlink wavelength on the EPON transmitter's main peak.

[0022] Figure 2 is a flowchart illustrating a passive optical network injection lockout risk detection method according to an embodiment of this disclosure.

[0023] Figure 3 is a schematic flowchart of a passive optical network injection lockout risk detection method according to an embodiment of this disclosure.

[0024] Figure 4 is a schematic diagram of detecting the first transmission quality of the uplink of a first passive optical network (PON) according to an embodiment of the present disclosure;

[0025] Figure 5 is a flowchart illustrating a passive optical network injection lockout risk detection method according to another embodiment of this disclosure.

[0026] Figure 6 is a schematic flowchart of another embodiment of the passive optical network injection lockout risk detection method provided in this disclosure.

[0027] Figure 7 is a flowchart illustrating a passive optical network injection lockout risk detection method provided in a specific example of this disclosure;

[0028] Figure 8 is a flowchart illustrating a passive optical network injection lockout risk detection method provided in another specific example of this disclosure;

[0029] Figure 9 is a block diagram of the electronic device provided in an embodiment of this disclosure. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of this disclosure, the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings.

[0031] The present disclosure will be described more fully below with reference to the accompanying drawings; however, the embodiments shown may be embodied in different forms, and the present disclosure should not be construed as limited to the embodiments set forth below. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will enable those skilled in the art to fully understand the scope of the disclosure.

[0032] The accompanying drawings of the embodiments disclosed herein are provided to further illustrate the embodiments of this disclosure and form part of the specification. They are used together with the detailed embodiments to explain this disclosure and do not constitute a limitation thereof. The above and other features and advantages will become more apparent to those skilled in the art from the description of the detailed embodiments with reference to the accompanying drawings.

[0033] This disclosure may be described with reference to plan and / or cross-sectional views using the ideal schematic diagrams of this disclosure. Therefore, the example illustrations may be modified according to manufacturing techniques and / or tolerances.

[0034] Where there is no conflict, the various embodiments of this disclosure and the features thereof in the embodiments may be combined with each other.

[0035] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the disclosure. The term "and / or" as used in this disclosure includes any and all combinations of one or more of the associated enumerated entries. The singular forms "a" and "the" as used in this disclosure are also intended to include the plural forms, unless the context clearly indicates otherwise. The terms "comprising," "made of," etc., as used in this disclosure specify the presence of the stated feature, integral, step, operation, element, and / or component, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof.

[0036] Unless otherwise specified, all terms used in this disclosure (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this disclosure, and will not be interpreted as having an idealized or overly formal meaning, unless expressly so defined in this disclosure.

[0037] This disclosure is not limited to the embodiments shown in the accompanying drawings, but includes modifications to the configuration based on the manufacturing process. Therefore, the areas illustrated in the drawings are schematic, and the shapes of the areas shown illustrate specific shapes of the areas of an element, but are not intended to be limiting.

[0038] In related technologies, the Transport Convergence Sublayer (TC layer) in the ATM (Asynchronous Transfer Mode) protocol mainly handles cell verification and rate control, as well as the assembly and disassembly of data frames. These functions correspond to the functions of the data link layer in the OSI (Open System Interconnect) model. The operating state of the EPON transmitter is controlled by the TC layer. When the 50G PON downlink wavelength is injected into the EPON uplink, and it is too close to the 1260-1360nm wavelength main mode, a mode competition phenomenon will occur at a specific wavelength, affecting the quality of the ONU's EPON uplink transmission signal and causing EPON uplink service anomalies. Figure 1 is a schematic diagram of the uplink injection lock-in risk of the 50G PON downlink wavelength to the EPON transmitter's main peak. As shown in Figure 1, the wavelength of 50G PON is approximately 1370nm, while the operating wavelength of the EPON transmitter is approximately 1260-1360nm. When 1370nm light is injected into the EPON transmitter, the EPON main peak is close to the 50GPON downlink light, and the 50G PON downlink light is exactly at the corresponding sidelobe peak position. This injection of 50GPON downlink light may cause the power of this submode to be equal to or even suppress the power of the main mode, resulting in continuous packet loss at the TC layer and the risk of injection lockout.

[0039] To address the aforementioned technical problems, this disclosure provides a method for detecting injection lock-in risks in passive optical networks. Figure 2 is a flowchart illustrating one embodiment of the method for detecting injection lock-in risks in passive optical networks provided by this disclosure. As shown in Figure 2, the method for detecting injection lock-in risks in passive optical networks includes the following steps:

[0040] Step S11: Detect the first transmission quality of the uplink of the first PON.

[0041] In this embodiment of the disclosure, the first PON can be an EPON or a 10G EPON. In this step, the first transmission quality of the uplink of the first PON is detected in real time.

[0042] Step S12: If the first transmission quality does not meet the preset conditions, adjust the downlink transmission parameters of the second PON.

[0043] If the first transmission quality does not meet the preset conditions, it indicates that the uplink signal of the first PON has degraded. In this case, the downlink transmission parameters of the second PON are adjusted. In this embodiment of the disclosure, the second PON can be a 50G PON.

[0044] In some embodiments, the first transmission quality failing to meet a preset condition includes at least one of the following:

[0045] The received optical power fluctuation range is greater than the preset second threshold.

[0046] The signal-to-noise ratio of the received electrical signal is less than a preset third threshold.

[0047] The fluctuation amplitude of the received electrical signal is greater than the preset fourth threshold.

[0048] The eye diagram crossover ratio of the received electrical signal is less than the preset fifth threshold;

[0049] The received bit error rate is greater than the preset sixth threshold;

[0050] Generate a Loss of Frame Interface (LoFI) alarm;

[0051] The packet loss rate is greater than the preset seventh threshold.

[0052] Step S13: Detect the second transmission quality of the uplink.

[0053] In this step, the uplink transmission quality of the first PON is checked again to determine whether the adjustment of the downlink transmission parameters of the second PON in step S12 has been effective.

[0054] Step S14: If the second transmission quality is better than the first transmission quality, determine that the ONU corresponding to the uplink has a second PON injection lock-in risk.

[0055] If the second transmission quality is better than the first transmission quality, it means that the transmission quality of the uplink of the first PON has improved, that is, the signal degradation of the uplink of the first PON has been alleviated. Therefore, it can be considered that adjusting the downlink transmission parameters of the second PON has an effect on alleviating the signal degradation of the uplink of the first PON. Thus, it can be determined that the ONU corresponding to this uplink has the risk of second PON injection lockout.

[0056] The passive optical network injection lock-in risk detection method in this embodiment includes: detecting the first transmission quality of the uplink of the first PON; adjusting the downlink transmission parameters of the second PON when the first transmission quality does not meet preset conditions; detecting the second transmission quality of the uplink, and determining that the optical network unit (ONU) corresponding to the uplink has a second PON injection lock-in risk when the second transmission quality is better than the first transmission quality; this embodiment proposes a method for detecting the injection lock-in risk of the second PON to the ONU, solving the mode competition problem between the second PON and the first PON, and improving the uplink transmission signal quality of the first PON.

[0057] Figure 3 is a schematic flowchart of a passive optical network injection lock-in risk detection method according to an embodiment of this disclosure. As shown in Figure 3, in some embodiments, after detecting the second transmission quality of the uplink (i.e., step S13), the passive optical network injection lock-in risk detection method may further include the following steps:

[0058] Step S15: If the first transmission quality is better than the second transmission quality or the first transmission quality is the same as the second transmission quality, detect the link loss of the uplink of the first PON.

[0059] If the first transmission quality is better than the second transmission quality, or the first transmission quality is the same as the second transmission quality, it means that the transmission quality of the uplink of the first PON has not improved, that is, the signal degradation of the uplink of the first PON has not been alleviated. Then, the link loss of the uplink of the first PON can be further detected to determine whether there is a risk of injection lockout in the second PON.

[0060] Step S16: If the link loss is less than a preset first threshold, determine that the ONU corresponding to the uplink has a second PON injection lock risk.

[0061] If the link loss is less than the preset first threshold, it can be determined that the ONU corresponding to the uplink has a second PON injection lock-in risk.

[0062] In some embodiments, after detecting the uplink link loss of the first PON (i.e., step S15), the passive optical network injection lockout risk detection method may further include the following steps:

[0063] Step S17: If the link loss is greater than or equal to a preset first threshold, determine that the ONU corresponding to the uplink does not have the risk of second PON injection lockout.

[0064] As can be seen from the above steps, if adjusting the downlink transmission parameters of the second PON can alleviate the uplink signal degradation of the first PON, it can be determined that there is a risk of second PON injection lockout; if adjusting the downlink transmission parameters of the second PON cannot alleviate the uplink signal degradation of the first PON, but the link loss of the first PON's uplink is small, it can also be determined that there is a risk of second PON injection lockout; if adjusting the downlink transmission parameters of the second PON cannot alleviate the uplink signal degradation of the first PON, and the link loss of the first PON's uplink is large, it can be determined that there is no risk of second PON injection lockout.

[0065] In some embodiments, when the first transmission quality is better than the second transmission quality or the first transmission quality is the same as the second transmission quality, detecting the uplink link loss of the first PON (i.e., step S15) includes the following steps:

[0066] Step S151: If the first transmission quality is better than the second transmission quality or the first transmission quality is the same as the second transmission quality, adjust the downlink transmission parameters of the second PON multiple times until the second transmission quality is better than the first transmission quality or the number of adjustments reaches the preset first number.

[0067] Step S152: When the number of adjustments reaches the preset first number, and the first transmission quality is better than the second transmission quality or the first transmission quality is the same as the second transmission quality, the link loss of the uplink of the first PON is detected.

[0068] Step S153: If the number of adjustments does not reach the preset first number and the second transmission quality is better than the first transmission quality, it is determined that the ONU corresponding to the uplink has a second PON injection lock risk.

[0069] As can be seen from steps S151-S153, if adjusting the downlink transmission parameters of the second PON cannot alleviate the uplink signal degradation of the first PON, the downlink transmission parameters of the second PON can be adjusted multiple times within a preset number of times. If the uplink signal degradation of the first PON still cannot be alleviated after multiple adjustments, the link loss of the first PON is then detected for further risk assessment. If the uplink signal degradation of the first PON can be alleviated after multiple adjustments within a preset number of times, it can be determined that there is a risk of second PON injection lockout.

[0070] In some embodiments, adjusting the downlink transmission parameters of the second PON (i.e., step S12) includes at least one of the following:

[0071] Adjust the downlink transmission wavelength of the second PON;

[0072] Adjust the downlink transmit optical power of the second PON;

[0073] Close the channel of the second PON.

[0074] In some embodiments, shutting down the channel of the second PON means shutting down the channel of the second PON transmitter on the OLT side.

[0075] In some embodiments, when the downlink transmission parameters of the second PON are adjusted to disable the channel of the second PON, and the second transmission quality is better than the first transmission quality, after determining that the ONU corresponding to the uplink has a second PON injection lock-in risk (i.e., step S14), or after determining that the ONU corresponding to the uplink has a second PON injection lock-in risk (i.e., step S16) when the link loss is less than a preset first threshold, the passive optical network injection lock-in risk detection method may further include the following steps:

[0076] Step S18: Open the channel of the second PON and adjust the downlink transmission wavelength and / or downlink transmission optical power of the second PON multiple times until the second transmission quality is better than the first transmission quality or the number of adjustments reaches the preset first number.

[0077] In this step, some measures can be taken to reduce the impact of the injection lock-in risk of the second PON. That is, after the second PON channel is turned on, the downlink transmission wavelength and / or downlink transmission optical power of the second PON are adjusted multiple times to alleviate the signal degradation of the uplink of the first PON and improve the uplink transmission quality in the EPON tri-mode.

[0078] To completely eliminate the risk of injection lockout, in some embodiments, after adjusting the downlink transmit parameters of the second PON to close the channel of the second PON, and after determining that the ONU corresponding to the uplink has the risk of injection lockout (i.e., step S14) when the second transmission quality is better than the first transmission quality, or after determining that the ONU corresponding to the uplink has the risk of injection lockout (i.e., step S16) when the link loss is less than a preset first threshold, or after opening the channel of the second PON and repeatedly adjusting the downlink transmit wavelength and / or downlink transmit optical power of the second PON until the second transmission quality is better than the first transmission quality or the number of adjustments reaches a preset first number (i.e., step S18), the passive optical network injection lockout risk detection method may further include the following steps:

[0079] Step S19: Filter the downlink transmission wavelength of the second PON and / or reduce the downlink transmission optical power of the second PON; or, replace the ONU corresponding to the uplink.

[0080] To avoid unnecessary adjustments due to misjudgment of risks, in some embodiments, filtering the downlink transmission wavelength of the second PON and / or reducing the downlink transmission optical power of the second PON; or, replacing the ONU corresponding to the uplink, includes the following steps: when the number of times it is determined that the ONU corresponding to the uplink has a second PON injection lock-in risk reaches a preset second number, filtering the downlink transmission wavelength of the second PON and / or reducing the downlink transmission optical power of the second PON; or, replacing the ONU corresponding to the uplink. Specifically, a counter can be set to count the number of times it is determined that the ONU corresponding to the uplink has a second PON injection lock-in risk.

[0081] In some embodiments, at least one of the following means may be employed:

[0082] Add a filter at any point in the link between the splitter branch port corresponding to the risky EPON ONU and the ONU input port to filter out the downlink transmission wavelength of the second PON;

[0083] Add an optical attenuator at any point in the link between the splitter branch port and the ONU input port corresponding to the risky EPON ONU to reduce the downlink transmit optical power of the second PON.

[0084] Replacement risk EPON ONU.

[0085] It should be noted that the risk EPON ONU mentioned here refers to an ONU that has the risk of being locked by a second PON injection.

[0086] It should be noted that the above-mentioned measures to completely eliminate the injection lock-in risk can be taken after it is determined that the ONU corresponding to the uplink has a second PON injection lock-in risk; alternatively, after it is determined that the ONU corresponding to the uplink has a second PON injection lock-in risk, the operation of mitigating the signal degradation of the uplink of the first PON can be performed first, i.e., step S18 can be executed, and then the above-mentioned measures to completely eliminate the injection lock-in risk can be taken; alternatively, the above-mentioned measures to completely eliminate the injection lock-in risk can be taken after it is determined that the ONU corresponding to the uplink has a second PON injection lock-in risk a certain number of times.

[0087] In some embodiments, detecting the first transmission quality of the uplink of the first PON (i.e., step S11) includes at least one of the following:

[0088] The first parameter of the optical signal received by the optical line terminal (OLT) in the uplink is detected.

[0089] The second parameter of the electrical signal output by the OLT receiver in the uplink is detected. The electrical signal is the electrical signal obtained by converting the optical signal received by the OLT receiver.

[0090] The third parameter is detected in the output signal of the analog-to-digital converter (ADC) within the OLT in the uplink. The OLT includes an OLT receiver and an ADC, with the input of the ADC connected to the output of the OLT receiver.

[0091] Figure 4 is a schematic diagram of detecting the first transmission quality of the uplink of the first PON according to an embodiment of the present disclosure. As shown in Figure 4, the transmission quality of the EPON uplink can be detected by detecting the following three signals:

[0092] (1) Detect the optical signal received by the OLT in the EPON uplink.

[0093] The optical power of the received optical signal before entering the EPON OLT receiver is monitored. When injection lock-in risk occurs, the optical power of the received signal will fluctuate abnormally. If the optical power exceeds the set optical power range, it can be determined that the first transmission quality does not meet the preset conditions.

[0094] (2) Detect the electrical signal output from the OLT receiver to the ADC.

[0095] Monitor the electrical signal output from the EPON OLT receiver to the ADC. When injection lock-in risk occurs, the possible anomalies include, but are not limited to, at least one of the following: deterioration of the signal-to-noise ratio of the electrical signal, abnormal amplitude fluctuations, and a decrease in the eye diagram crossing point.

[0096] (3) Detect the ADC output signal

[0097] Monitor the data converted after entering the EPON OLT. When injection lock risk occurs, the possible data anomalies include, but are not limited to: increased bit error rate of received data, generation of LoFI alarms, and increased packet loss rate.

[0098] This disclosure also provides a method for detecting injection lock-in risk in a passive optical network. Figure 5 is a flowchart illustrating another embodiment of this disclosure of a method for detecting injection lock-in risk in a passive optical network. As shown in Figure 5, the method for detecting injection lock-in risk in a passive optical network includes the following steps:

[0099] Step S21: Detect the first transmission quality of the uplink of the first PON.

[0100] In this embodiment of the disclosure, the first PON can be an EPON or a 10G EPON. In this step, the first transmission quality of the uplink of the first PON is detected in real time.

[0101] Step S22: If the first transmission quality does not meet the preset conditions, detect the link loss of the uplink of the first PON.

[0102] If the first transmission quality does not meet the preset conditions, it indicates that the uplink signal of the first PON is degraded. In this case, instead of adjusting the downlink transmission parameters of the second PON, the link loss of the uplink of the first PON can be directly detected to further detect the injection lockout risk of the second PON, which can improve the efficiency of injection lockout risk detection.

[0103] In some embodiments, the first transmission quality failing to meet a preset condition includes at least one of the following:

[0104] The received optical power fluctuation range is greater than the preset second threshold.

[0105] The signal-to-noise ratio of the received electrical signal is less than a preset third threshold.

[0106] The fluctuation amplitude of the received electrical signal is greater than the preset fourth threshold.

[0107] The eye diagram crossover ratio of the received electrical signal is less than the preset fifth threshold;

[0108] The received bit error rate is greater than the preset sixth threshold;

[0109] Generate a Loss of Frame Interface (LoFI) alarm;

[0110] The packet loss rate is greater than the preset seventh threshold.

[0111] Step S23: If the link loss is less than a preset first threshold, determine that the ONU corresponding to the uplink has a second PON injection lock-in risk.

[0112] In this embodiment of the disclosure, the second PON may be a 50G PON.

[0113] The passive optical network injection lockout risk detection method in this embodiment includes: detecting the first transmission quality of the uplink of the first PON; detecting the link loss of the uplink of the first PON when the first transmission quality does not meet the preset conditions; and determining that the optical network unit (ONU) corresponding to the uplink has a second PON injection lockout risk when the link loss is less than a preset first threshold. This embodiment proposes a method for detecting the injection lockout risk of the second PON to the ONU, which solves the mode competition problem between the second PON and the first PON and improves the uplink transmission signal quality of the first PON.

[0114] Figure 6 is a schematic flowchart of another embodiment of the passive optical network injection lockout risk detection method provided in this disclosure. As shown in Figure 6, in some embodiments, after detecting the link loss of the uplink of the first PON (i.e., step S22), the passive optical network injection lockout risk detection method may further include the following steps:

[0115] Step S24: If the link loss is greater than or equal to a preset first threshold, adjust the downlink transmission parameters of the second PON and detect the second transmission quality of the uplink.

[0116] If the link loss of the uplink of the first PON is greater than or equal to a preset first threshold, the transmission quality of the uplink can be further detected to determine whether there is a risk of injection lockout in the second PON.

[0117] Step S25: If the second transmission quality is better than the first transmission quality, determine that the ONU corresponding to the uplink has a second PON injection lock-in risk.

[0118] If the second transmission quality is better than the first transmission quality, it means that the uplink transmission quality of the first PON has improved, that is, the uplink signal degradation of the first PON has been alleviated. Therefore, it can be determined that the ONU corresponding to the uplink has the risk of injection lock-in by the second PON.

[0119] Step S26: If the first transmission quality is better than the second transmission quality or the first transmission quality is the same as the second transmission quality, determine that the ONU corresponding to the uplink does not have the risk of second PON injection lockout.

[0120] If the first transmission quality is better than the second transmission quality, or the first transmission quality is the same as the second transmission quality, it indicates that the uplink transmission quality of the first PON has not improved, that is, the signal degradation of the uplink of the first PON has not been alleviated. In other words, after detecting the link loss of the uplink of the first PON and adjusting the downlink transmission parameters of the second PON, and after two injection lock-in risk assessments, it is determined that the ONU corresponding to the uplink does not have the risk of injection lock-in of the second PON.

[0121] In some embodiments, adjusting the downlink transmission parameters of the second PON and detecting the second transmission quality of the uplink (i.e., step S24) includes the following steps: repeatedly adjusting the downlink transmission parameters of the second PON until the second transmission quality is better than the first transmission quality or the number of adjustments reaches a preset first number. That is, when the uplink link loss is large, the downlink transmission parameters of the second PON can be adjusted multiple times within the preset number of adjustments (i.e., the first number).

[0122] In some embodiments, after repeatedly adjusting the downlink transmission parameters of the second PON until the second transmission quality is better than the first transmission quality or the number of adjustments reaches a preset first-time number, the passive optical network injection lock-in risk detection method may further include the following steps: If the number of adjustments reaches the preset first-time number, and the first transmission quality is better than the second transmission quality, or the first transmission quality is the same as the second transmission quality, then it is determined that the ONU corresponding to the uplink does not have a second PON injection lock-in risk. If the number of adjustments does not reach the preset first-time number, and the second transmission quality is better than the first transmission quality, then it is determined that the ONU corresponding to the uplink has a second PON injection lock-in risk. That is, if multiple adjustments to the downlink transmission parameters of the second PON have reached a preset maximum number of adjustments but have not alleviated the uplink signal degradation of the first PON, then it is considered that the ONU corresponding to the uplink does not have a second PON injection lock-in risk; if the uplink signal degradation of the first PON has been alleviated before reaching the preset maximum number of adjustments, then no further adjustments are made, and it is considered that the ONU corresponding to the uplink has a second PON injection lock-in risk.

[0123] To mitigate the signal degradation of the uplink in the first PON and improve the uplink transmission quality in EPON tri-mode, in some embodiments, after determining that the ONU corresponding to the uplink has a second PON injection lock-in risk (i.e., step S23), the passive optical network injection lock-in risk detection method may further include the following steps:

[0124] Step S27: Adjust the downlink transmission parameters of the second PON.

[0125] In some embodiments, adjusting the downlink transmission parameters of the second PON may include:

[0126] Adjust the downlink transmission wavelength of the second PON;

[0127] Adjust the downlink transmit optical power of the second PON;

[0128] Close the channel of the second PON.

[0129] In some embodiments, adjusting the downlink transmission parameters of the second PON (i.e., step S27) includes the following steps: repeatedly adjusting the downlink transmission wavelength and / or downlink transmission optical power of the second PON until the second transmission quality is better than the first transmission quality or the number of adjustments reaches a preset third time. That is, when it is determined that the ONU corresponding to the uplink has a risk of second PON injection lockout, the downlink transmission wavelength and / or downlink transmission optical power of the second PON are adjusted multiple times within a preset number of adjustments (i.e., the third time) to alleviate the signal degradation of the uplink of the first PON and improve the uplink transmission quality in the EPON tri-mode.

[0130] To completely eliminate the risk of injection lockout, in some embodiments, after determining that the ONU corresponding to the uplink has a second PON injection lockout risk when the number of adjustments has not reached a preset first number and the second transmission quality is better than the first transmission quality, or after determining that the ONU corresponding to the uplink has a second PON injection lockout risk when the second transmission quality is better than the first transmission quality (i.e., step S25), the passive optical network injection lockout risk detection method may further include the following steps:

[0131] Step S28: Filter the downlink transmission wavelength of the second PON and / or reduce the downlink transmission optical power of the second PON; or, replace the ONU corresponding to the uplink.

[0132] To avoid unnecessary adjustments due to misjudgment of risks, in some embodiments, if the number of times it is determined that the ONU corresponding to the uplink has a second PON injection lock risk reaches a preset second number, the downlink transmission wavelength of the second PON is filtered and / or the downlink transmission optical power of the second PON is reduced; or, the ONU corresponding to the uplink is replaced.

[0133] In some embodiments, detecting the first transmission quality of the uplink of the first PON (i.e., step S11) includes at least one of the following:

[0134] The first parameter of the optical signal received by the optical line terminal (OLT) in the uplink is detected.

[0135] The second parameter of the electrical signal output by the OLT receiver in the uplink is detected. The electrical signal is the electrical signal obtained by converting the optical signal received by the OLT receiver.

[0136] The third parameter is detected in the output signal of the analog-to-digital converter (ADC) within the OLT in the uplink. The OLT includes an OLT receiver and an ADC, with the input of the ADC connected to the output of the OLT receiver.

[0137] To clearly illustrate the scheme of the embodiments of this disclosure, the following detailed description of the passive optical network injection lockout risk detection process is provided with reference to FIG7, through a specific example, wherein the first PON is EPON and the second PON is 50G PON.

[0138] As shown in Figure 7, the passive optical network injection lockout risk detection method includes the following steps:

[0139] Step S101: Detect the signal quality of the EPON uplink.

[0140] Step S102: Determine whether the EPON uplink signal has deteriorated. If the EPON uplink signal has deteriorated, proceed to step S103; otherwise, return to step S101.

[0141] Step S103: Adjust the 50G PON downlink transmit power or downlink wavelength.

[0142] Step S104: Determine whether the signal degradation of the EPON uplink has been alleviated. If not, proceed to step S105; if so, proceed to step S109.

[0143] Step S105: Determine whether the number of adjustments to the 50G PON has reached the preset number N1. If it has, proceed to step S106; otherwise, proceed to step S103.

[0144] Step S106: Detect EPON uplink loss.

[0145] Step S107: Determine whether the EPON uplink loss is less than the preset threshold M. If it is less, determine that the ONU corresponding to the EPON uplink has a 50G PON injection lock risk; otherwise, proceed to step S108.

[0146] Step S108: Determine that the ONU corresponding to the EPON uplink does not have the risk of 50G PON injection lockout.

[0147] Step S109: Determine that the ONU corresponding to the EPON uplink has a 50G PON injection lock risk.

[0148] Furthermore, after determining in step S104 that the ONU corresponding to the EPON uplink has a 50G PON injection lockout risk, the following steps may also be included:

[0149] Step S110: Determine whether the number of times the ONU corresponding to the uplink has been found to have 50G PON injection lock risk has reached the preset number N2. If it has, proceed to step S111; otherwise, return to step S101.

[0150] Step S111: Filter out the 50G PON wavelength or reduce the 50GPON downlink transmit power in the risk link corresponding to the EPON uplink, or replace the ONU corresponding to the EPON uplink.

[0151] To clearly illustrate the scheme of the embodiments of this disclosure, the following describes in detail the passive optical network injection lockout risk detection process through another specific example with reference to FIG8, wherein the first PON is EPON and the second PON is 50G PON.

[0152] As shown in Figure 8, the passive optical network injection lockout risk detection method includes the following steps:

[0153] Step S201: Detect the signal quality of the EPON uplink.

[0154] Step S202: Determine whether the EPON uplink signal has deteriorated. If the EPON uplink signal has deteriorated, proceed to step S203; otherwise, return to step S201.

[0155] Step S203: Detect EPON uplink loss.

[0156] Step S204: Determine whether the EPON uplink loss is less than the preset threshold M. If it is less, proceed to step S209; otherwise, proceed to step S205.

[0157] Step S205: Adjust the 50G PON downlink transmit power or downlink wavelength.

[0158] Step S206: Determine whether the signal degradation of the EPON uplink has been alleviated. If not, proceed to step S207; if so, proceed to step S209.

[0159] Step S207: Determine whether the number of adjustments to the 50G PON has reached the preset number N1. If it has, proceed to step S208; otherwise, proceed to step S205.

[0160] Step S208: Determine that the ONU corresponding to the EPON uplink does not have the risk of 50G PON injection lockout.

[0161] Step S209: Determine that the ONU corresponding to the EPON uplink has a 50G PON injection lockout risk.

[0162] Furthermore, after determining in step 209 that the ONU corresponding to the EPON uplink has a 50G PON injection lockout risk, the following steps may also be included:

[0163] Step S210: Filter out the 50G PON wavelength or reduce the 50GPON downlink transmit power in the risk link corresponding to the EPON uplink, or replace the ONU corresponding to the EPON uplink.

[0164] This disclosure applies to scenarios where various types of passive optical networks coexist, specifically EPON tri-mode 50G PON downlink scenarios, enabling the detection and resolution of EPON injection lock-in risks from 50G PON. This disclosure creatively addresses the EPON uplink injection lock-in risk problem caused by the 50G PON downlink wavelength in EPON tri-mode, facilitating early planning and deployment of EPON tri-mode 50G PON downlink wavelength schemes.

[0165] This disclosure also provides an electronic device, as shown in FIG9, which includes a memory 1 and a processor 2; the memory 1 stores a computer program that can be executed by the processor, and when the computer program is executed by the processor, it implements any of the passive optical network injection lock risk detection methods of this disclosure.

[0166] Among them, processor 2 is a device with data processing capabilities, including but not limited to a central processing unit (CPU); memory is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (FLASH); I / O interface (read-write interface) is connected between processor and memory, enabling information exchange between memory 1 and processor 2, including but not limited to data bus (Bus).

[0167] This disclosure also provides a computer-readable medium having a computer program stored thereon, which, when executed by the processor, implements any of the passive optical network injection lock-in risk detection methods of this disclosure.

[0168] This disclosure also provides a computer program product, which includes a computer program that, when executed by a processor, implements any of the passive optical network injection lockout risk detection methods of this disclosure.

[0169] Among them, the processor is a device with data processing capabilities, including but not limited to the central processing unit (CPU); the memory is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and flash memory (FLASH); the I / O interface (read-write interface) is connected between the processor and the memory, enabling information exchange between the memory and the processor, including but not limited to the data bus (Bus).

[0170] Those skilled in the art will understand that all or some of the steps, systems, and devices disclosed above, as functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0171] In hardware implementations, the division between functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be executed by several physical components working together.

[0172] Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit (CPU), digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software may be distributed on a computer-readable medium, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technique for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (FLASH) or other disk storage; read-only optical disc (CD-ROM), digital versatile disc (DVD) or other optical disc storage; magnetic cartridges, magnetic tapes, disk storage or other magnetic storage; and any other media that can be used to store desired information and can be accessed by a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0173] This disclosure has disclosed exemplary embodiments, and although specific terminology has been used, it is for general illustrative purposes only and should not be construed as limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in conjunction with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of this disclosure as set forth by the appended claims.

Claims

1. A method for detecting injection lockout risk in a passive optical network, comprising: Test the first transmission quality of the uplink of the first passive optical network (PON); If the first transmission quality does not meet the preset conditions, adjust the downlink transmission parameters of the second PON; Detect the second transmission quality of the uplink; If the second transmission quality is better than the first transmission quality, it is determined that the optical network unit (ONU) corresponding to the uplink is subject to the second PON injection lockout risk.

2. The method according to claim 1, wherein, After detecting the second transmission quality of the uplink, the method further includes: If the first transmission quality is better than the second transmission quality or the first transmission quality is the same as the second transmission quality, the link loss of the uplink of the first PON is detected. If the link loss is less than a preset first threshold, it is determined that the ONU corresponding to the uplink has the risk of second PON injection lockout.

3. The method according to claim 2, wherein, After detecting the uplink link loss of the first PON, the method further includes: If the link loss is greater than or equal to the preset first threshold, it is determined that the ONU corresponding to the uplink does not have the risk of the second PON injection lockout.

4. The method according to claim 2, wherein, The step of detecting the uplink link loss of the first PON when the first transmission quality is better than the second transmission quality or the first transmission quality is the same as the second transmission quality includes: If the first transmission quality is better than the second transmission quality or the first transmission quality is the same as the second transmission quality, the downlink transmission parameters of the second PON are adjusted multiple times until the second transmission quality is better than the first transmission quality or the number of adjustments reaches the preset first number. When the number of adjustments reaches the preset first number, and the first transmission quality is better than the second transmission quality or the first transmission quality is the same as the second transmission quality, the link loss of the uplink of the first PON is detected.

5. The method according to claim 4, wherein, When the first transmission quality is better than the second transmission quality, or the first transmission quality is the same as the second transmission quality, the downlink transmission parameters of the second PON are adjusted multiple times until the second transmission quality is better than the first transmission quality or the number of adjustments reaches a preset first time. This process then further includes: If the number of adjustments does not reach the preset first number, and the second transmission quality is better than the first transmission quality, it is determined that the ONU corresponding to the uplink has a second PON injection lock-in risk.

6. The method according to claim 2, wherein, The adjustment of the downlink transmission parameters of the second PON includes at least one of the following: Adjust the downlink transmission wavelength of the second PON; Adjust the downlink transmit optical power of the second PON; Shut down the channel of the second PON.

7. The method according to claim 6, wherein, The adjustment of the downlink transmission parameters of the second PON includes shutting down the channel of the second PON. After determining that the ONU corresponding to the uplink has a risk of second PON injection lockout when the second transmission quality is better than the first transmission quality, or after determining that the ONU corresponding to the uplink has a risk of second PON injection lockout when the link loss is less than a preset first threshold, the adjustment further includes: The channel of the second PON is activated, and the downlink transmission wavelength and / or downlink transmission optical power of the second PON are adjusted multiple times until the second transmission quality is better than the first transmission quality or the number of adjustments reaches the preset first number.

8. The method according to claim 2, wherein, After determining that the ONU corresponding to the uplink has the risk of the second PON injection lockout when the second transmission quality is better than the first transmission quality, or after determining that the ONU corresponding to the uplink has the risk of the second PON injection lockout when the link loss is less than a preset first threshold, the method further includes: Filter the downlink transmission wavelength of the second PON and / or reduce the downlink transmission optical power of the second PON; or replace the ONU corresponding to the uplink.

9. The method according to claim 8, wherein, The filtering of the downlink transmission wavelength of the second PON and / or reduction of the downlink transmission optical power of the second PON; Alternatively, replace the ONU corresponding to the uplink, including: If the number of times that the ONU corresponding to the uplink has the risk of second PON injection lockout reaches a preset second number, the downlink transmission wavelength of the second PON is filtered and / or the downlink transmission optical power of the second PON is reduced. Alternatively, replace the ONU corresponding to the uplink.

10. The method according to any one of claims 1-9, wherein, The detection of the first transmission quality of the uplink of the first passive optical network (PON) includes at least one of the following: Detect the first parameter of the optical signal received by the optical line terminal (OLT) in the uplink; The second parameter of the electrical signal output by the OLT receiver in the uplink is detected, wherein the electrical signal is the electrical signal obtained by converting the optical signal received by the OLT receiver; The third parameter of the output signal of the analog-to-digital converter (ADC) within the OLT in the uplink is detected, wherein the OLT includes an OLT receiver and an ADC, and the input terminal of the ADC is connected to the output terminal of the OLT receiver.

11. A method for detecting injection lockout risk in a passive optical network, comprising: Test the first transmission quality of the uplink of the first passive optical network (PON); If the first transmission quality does not meet the preset conditions, the link loss of the uplink of the first PON is detected. If the link loss is less than a preset first threshold, it is determined that the optical network unit (ONU) corresponding to the uplink has a second PON injection lockout risk.

12. The method according to claim 11, wherein, After detecting the uplink link loss of the first PON, the method further includes: If the link loss is greater than or equal to a preset first threshold, the downlink transmission parameters of the second PON are adjusted, and the second transmission quality of the uplink is detected. If the second transmission quality is better than the first transmission quality, it is determined that the ONU corresponding to the uplink is subject to the second PON injection lock-in risk.

13. The method according to claim 12, wherein, The adjustment of the downlink transmission parameters of the second PON and the detection of the second transmission quality of the uplink include: The downlink transmission parameters of the second PON are adjusted multiple times until the second transmission quality is better than the first transmission quality or the number of adjustments reaches the preset first time.

14. The method according to claim 13, wherein, After repeatedly adjusting the downlink transmission parameters of the second PON until the second transmission quality is better than the first transmission quality or the number of adjustments reaches a preset first number, the process further includes: If the number of adjustments reaches the preset first number, and the first transmission quality is better than the second transmission quality or the first transmission quality is the same as the second transmission quality, it is determined that the ONU corresponding to the uplink does not have the risk of the second PON injection lockout.

15. The method according to claim 13, wherein, After repeatedly adjusting the downlink transmission parameters of the second PON until the second transmission quality is better than the first transmission quality or the number of adjustments reaches a preset first number, the process further includes: If the number of adjustments does not reach the preset first number, and the second transmission quality is better than the first transmission quality, it is determined that the ONU corresponding to the uplink has a second PON injection lock-in risk.

16. The method according to claim 12, wherein, After determining that the optical network unit (ONU) corresponding to the uplink has a second PON injection lock risk, the method further includes: adjusting the downlink transmission parameters of the second PON.

17. The method according to claim 16, wherein, The adjustment of the downlink transmission parameters of the second PON includes at least one of the following: Adjust the downlink transmission wavelength of the second PON; Adjust the downlink transmit optical power of the second PON; Shut down the channel of the second PON.

18. The method according to claim 17, wherein, The adjustment of the downlink transmission parameters of the second PON includes: The downlink transmission wavelength and / or downlink transmission optical power of the second PON are adjusted multiple times until the second transmission quality is better than the first transmission quality or the number of adjustments reaches a preset third time.

19. The method according to claim 12, wherein, After determining that the ONU corresponding to the uplink has the risk of the second PON injection lockout when the second transmission quality is better than the first transmission quality, the method further includes: Filter the downlink transmission wavelength of the second PON and / or reduce the downlink transmission optical power of the second PON; or replace the ONU corresponding to the uplink.

20. The method according to claim 19, wherein, The filtering of the downlink transmission wavelength of the second PON and / or reduction of the downlink transmission optical power of the second PON; Alternatively, replace the ONU corresponding to the uplink, including: If the number of times that the ONU corresponding to the uplink has the risk of second PON injection lockout reaches a preset second number, the downlink transmission wavelength of the second PON is filtered and / or the downlink transmission optical power of the second PON is reduced. Alternatively, replace the ONU corresponding to the uplink.

21. The method according to any one of claims 11-20, wherein, The detection of the first transmission quality of the uplink of the first passive optical network (PON) includes at least one of the following: Detect the first parameter of the optical signal received by the optical line terminal (OLT) in the uplink; The second parameter of the electrical signal output by the OLT receiver in the uplink is detected, wherein the electrical signal is the electrical signal obtained by converting the optical signal received by the OLT receiver; The third parameter of the output signal of the analog-to-digital converter (ADC) within the OLT in the uplink is detected, wherein the OLT includes an OLT receiver and an ADC, and the input terminal of the ADC is connected to the output terminal of the OLT receiver.

22. An electronic device comprising a memory and a processor; the memory storing a computer program executable by the processor, wherein the computer program, when executed by the processor, implements the passive optical network injection lock-in risk detection method according to any one of claims 1-10, or the passive optical network injection lock-in risk detection method according to any one of claims 11-21.

23. A computer-readable medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the passive optical network injection lock-in risk detection method according to any one of claims 1-10, or the passive optical network injection lock-in risk detection method according to any one of claims 11-21.

24. A computer program product comprising a computer program that, when executed by a processor, implements the passive optical network injection lock-in risk detection method according to any one of claims 1-10, or the passive optical network injection lock-in risk detection method according to any one of claims 11-21.

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