A method and device for switching optical line protection based on 400G all-optical network zero insertion loss OLP

Abstract

The present invention relates to the field of line protection, and discloses a 400G all-optical network zero-insertion-loss OLP optical line protection switching method and device, comprising the following steps: obtaining an optical power value and a signal quality index through real-time monitoring by an optical power monitoring module of an OLP device, comparing the optical power value and the signal quality index of a main optical fiber with corresponding optical power thresholds and signal quality thresholds respectively, and preliminarily judging the main optical fiber fault if at least one of the optical power value or the signal quality index is greater than or equal to the corresponding threshold, obtaining a fault alarm index according to the optical power value and the signal quality index and comparing it with the fault alarm threshold, and re-judging the main optical fiber fault and generating a switching instruction if the fault alarm index is greater than or equal to the fault alarm threshold, judging the network interval according to the time point of generating the switching instruction to judge whether to issue the switching instruction, executing the switching action of switching the main optical fiber to the backup optical fiber after receiving the switching instruction, and switching the backup optical fiber to the main optical fiber when the main optical fiber returns to normal.

Description

Technical Field

[0001] The present invention relates to the field of line protection, and in particular to a 400G all-optical network zero-insertion-loss OLP optical line protection switching method and device. Background Art

[0002] The 400G all-optical network zero insertion loss OLP optical line protection switching system is an automatic monitoring and protection system that is completely independent of the communication transmission system and is built on the physical link of the optical cable. It uses advanced zero insertion loss technology to ensure that no additional optical power loss is introduced during the switching of the main and standby optical fibers, thereby ensuring high-quality transmission of communication signals. Through zero insertion loss technology, high-speed switching capability, transparent transmission, real-time monitoring and fault management, high reliability and flexibility, it provides a strong guarantee for the stable operation of the optical fiber communication network.

[0003] However, there are some problems in the process of switching between the main and backup optical fibers. For example, when the optical power of the main optical fiber is lower than the set threshold or the signal quality is abnormal, the system determines that the main optical fiber is faulty. At this time, the main and backup optical fibers will be switched. However, when the optical power of the main optical fiber is restored or the signal quality is normal, the system will switch back to the main optical fiber. In a short period of time, due to the influence of network peak hours or other factors, there will be frequent fault alarms of the main optical fiber, resulting in frequent switching of the main and backup optical fibers, which seriously affects the transmission quality of the signal. Summary of the invention

[0004] The purpose of the present invention is to provide a method and device for zero insertion loss OLP optical line protection switching based on a 400G all-optical network to solve the above technical problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A 400G all-optical network zero insertion loss OLP optical line protection switching method, which comprises the following steps:

[0007] S1: The optical power monitoring module of the OLP device monitors the optical power and signal quality of the primary and backup optical fibers in real time to obtain the optical power value and signal quality index;

[0008] S2: Compare the optical power value and signal quality index of the main optical fiber with the corresponding optical power threshold and signal quality threshold respectively. If at least one of the optical power value ≥ optical power threshold or the signal quality index ≥ signal quality threshold is satisfied, the main optical fiber is initially judged to be faulty; otherwise, the main optical fiber is judged to be normal.

[0009] S3: A fault alarm index is obtained based on a comprehensive analysis of the optical power value and the signal quality index, and the fault alarm index is compared with the fault alarm threshold. If the fault alarm index ≥ the fault alarm threshold, the main optical fiber is re-judged to be faulty and a main / standby optical fiber switching instruction is generated; otherwise, the main optical fiber is judged to be normal;

[0010] S4: judging the network interval according to the time point of generating the master / slave optical fiber switching instruction to determine whether to issue the master / slave optical fiber switching instruction, wherein the network interval includes a network peak period, a network stable period, and a network low period;

[0011] S5: After receiving the main-backup optical fiber switching instruction, the main optical fiber is switched to the backup optical fiber. When the main optical fiber returns to normal, the backup optical fiber is switched to the main optical fiber.

[0012] As a further technical solution, the process of dividing the network interval of the current main optical fiber is as follows:

[0013] Obtain the network traffic of the main optical fiber through the network traffic monitoring module;

[0014] Establish a coordinate system with time as the horizontal axis and network traffic as the vertical axis;

[0015] The normalization method is used to fit and draw the curve S(t) of the network flow of the main optical fiber changing with time in the coordinate system;

[0016] Get The corresponding time points are marked from left to right as S1, S2, ...S n ;

[0017] Draw two reference curves S based on historical data 01 (t), S 02 (t), where S 02 (t is the upper limit of normal network traffic, S 01 (t) is the lower limit of normal network traffic;

[0018] Will be located in S 02 The interval between S(t) and S(t) is marked as the network peak period. 01 The interval between S(t) and S(t) is marked as the network low period. 02 (t) Below S 01 The interval enclosed above (t) is marked as the network stable period.

[0019] As a further technical solution, the method for obtaining the fault alarm index is:

[0020] By formula:

[0021]

[0022]

[0023] Calculate and obtain the fault alarm index G;

[0024] in, is the historical fluctuation coefficient, P is the optical power value, Q is the signal quality index, P0 and Q0 are the optical power threshold and signal quality threshold respectively;

[0025] P j is the optical power value obtained by the jth detection, Q j is the signal quality index obtained by the jth detection, are the average values ​​of optical power and signal quality index obtained based on historical data, respectively; and n is the total number of detections within a set period of time.

[0026] As a further technical solution, the setting time period is obtained in the following manner:

[0027] The time point at which the primary fiber failure is initially determined in each successful primary / standby fiber switching action is obtained as the starting time point t ik , the time point at which the master / slave fiber switching instruction is generated is taken as the end time point t ik+1 ;

[0028] By formula:

[0029]

[0030] Calculate and obtain the interval duration ΔT;

[0031] According to the interval length ΔT, the set time period [t ik , t ik +ΔT].

[0032] As a further technical solution, the process of determining the network interval according to the time point of generating the master-slave fiber switching instruction to determine whether to issue the master-slave fiber switching instruction is as follows:

[0033] By formula:

[0034]

[0035] Calculate and obtain the alarm coefficient F;

[0036] Where r is the coefficient corresponding to each network interval, x is the number of times the main optical fiber failure is initially determined within a working cycle, and ρ1, ρ2, and ρ3 are preset proportional coefficients.

[0037] As a further technical solution, if the network interval falls into the network peak period, the value of r is 3; if the network interval falls into the network stable period, the value is 2; if the network interval falls into the network trough period, the value is 1.

[0038] As a further technical solution, the method for obtaining the signal quality index Q is:

[0039] Obtain the attenuation value SH, dispersion value SE, and signal-to-noise ratio XI of the main optical fiber through monitoring instruments;

[0040] Substitute the attenuation value SH, dispersion value SE, and signal-to-noise ratio XI into the following formula:

[0041]

[0042] The signal quality index Q is calculated;

[0043] Among them, δ1, δ2, and δ3 are conversion coefficients.

[0044] The attenuation value SH of the current main optical fiber is obtained by detecting with an optical time domain reflectometer, the dispersion value SE of the current main optical fiber is obtained by detecting with a dispersion tester, and the signal-to-noise ratio XI of the current main optical fiber is obtained by detecting with an optical power meter or a spectrometer.

[0045] A 400G all-optical network based zero insertion loss OLP optical line protection switching device, the device comprising: a memory, a processor, and a 400G all-optical network based zero insertion loss OLP optical line protection switching source program stored in the memory and executable on the processor, the 400G all-optical network based zero insertion loss OLP optical line protection switching source program being configured to implement the 400G all-optical network based zero insertion loss OLP optical line protection switching method.

[0046] Beneficial effects of the present invention:

[0047] The present invention obtains a preliminary judgment result of the main optical fiber by comparing the signal quality index and the optical power value with their respective thresholds, and then re-judgments the fault alarm index obtained by comprehensive analysis of the signal quality index and the optical power value to confirm the status of the main optical fiber and avoid the impact on communication quality caused by short-term frequent switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The present invention will be further described below in conjunction with the accompanying drawings.

[0049] Figure 1 It is a diagram of the method steps of the present invention. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] See also Figure 1 As shown, the present invention is a 400G all-optical network zero insertion loss OLP optical line protection switching method, which specifically includes the following steps:

[0052] S1: The optical power monitoring module of the OLP device monitors the optical power and signal quality of the primary and backup optical fibers in real time to obtain the optical power value and signal quality index;

[0053] S2: Compare the optical power value and signal quality index of the main optical fiber with the corresponding optical power threshold and signal quality threshold respectively. If at least one of the optical power value ≥ optical power threshold or the signal quality index ≥ signal quality threshold is satisfied, the main optical fiber is initially judged to be faulty; otherwise, the main optical fiber is judged to be normal.

[0054] S3: A fault alarm index is obtained based on a comprehensive analysis of the optical power value and the signal quality index, and the fault alarm index is compared with the fault alarm threshold. If the fault alarm index ≥ the fault alarm threshold, the main optical fiber is re-judged to be faulty and a main / standby optical fiber switching instruction is generated; otherwise, the main optical fiber is judged to be normal;

[0055] S4: judging the network interval according to the time point of generating the master / slave optical fiber switching instruction to determine whether to issue the master / slave optical fiber switching instruction, wherein the network interval includes a network peak period, a network stable period, and a network low period;

[0056] S5: After receiving the main-backup optical fiber switching instruction, the main optical fiber is switched to the backup optical fiber. When the main optical fiber returns to normal, the backup optical fiber is switched to the main optical fiber.

[0057] In this embodiment, a specific method for switching optical line protection based on a 400G all-optical network with zero insertion loss OLP is provided. First, the optical power and signal quality of the main and standby optical fibers are monitored in real time through the optical power monitoring module of the OLP device to obtain the optical power value and the signal quality index, so as to quantitatively compare the communication quality of the main and standby optical fibers in the form of the optical power value and the signal quality index, which is more concise and clear. Secondly, the optical power value and the signal quality index of the main optical fiber are compared with the corresponding optical power threshold and the signal quality threshold respectively. If at least one of the optical power value ≥ the optical power threshold or the signal quality index ≥ the signal quality threshold is satisfied, the main optical fiber is initially judged to be faulty. Otherwise, the main optical fiber is judged to be normal. Once any one or both of the above two parameters exceed the threshold, it is judged that there is a communication fault in the main optical fiber. At this time, in order to ensure normal optical fiber communication, it is necessary to switch to the standby optical fiber. However, in order to prevent the fault alarm from being smaller than the threshold each time, resulting in a frequency The fault alarm index is obtained by comprehensive analysis based on the optical power value and the signal quality index, and the fault alarm index is compared with the fault alarm threshold. If the fault alarm index ≥ the fault alarm threshold, the main optical fiber fault is re-judged and a main-standby optical fiber switching instruction is generated. Otherwise, the main optical fiber is judged to be normal, thereby confirming the status of the main optical fiber and avoiding the impact on the communication quality caused by short-term frequent switching. Finally, the network interval is judged according to the time point when the main-standby optical fiber switching instruction is generated to determine whether to issue the main-standby optical fiber switching instruction. The network interval includes the network peak period, the network stable period and the network low period. It is judged again whether the signal jam is caused by the large network traffic. Obviously, the fault alarm that occurs during the network low period has a higher probability of main optical fiber failure. Therefore, after receiving the main-standby optical fiber switching instruction, the switching action of switching the main optical fiber to the standby optical fiber is executed. When the main optical fiber returns to normal, the standby optical fiber is switched to the main optical fiber.

[0058] The process of dividing the network interval of the current main optical fiber is as follows:

[0059] Obtain the network traffic of the main optical fiber through the network traffic monitoring module;

[0060] Establish a coordinate system with time as the horizontal axis and network traffic as the vertical axis;

[0061] The normalization method is used to fit and draw the curve S(t) of the network flow of the main optical fiber changing with time in the coordinate system;

[0062] Get The corresponding time points are marked from left to right as S1, S2, ...S n ;

[0063] Draw two reference curves S based on historical data 01 (t), S 02 (t), where S02 (t is the upper limit of normal network traffic, S 01 (t) is the lower limit of normal network traffic;

[0064] Will be located in S 02 The interval between S(t) and S(t) is marked as the network peak period. 01 The interval between S(t) and S(t) is marked as the network low period. 02 (t) Below S 01 The interval enclosed above (t) is marked as the network stable period.

[0065] In this embodiment, a specific method for dividing the network interval is provided. First, a coordinate system is established with time as the horizontal axis and network traffic as the vertical axis. 01 (t), S 02 (t) comparison, so that the 02 The interval between S(t) and S(t) is marked as the network peak period. 01 The interval between S(t) and S(t) is marked as the network low period. 02 (t) Below S 01 (t) The area enclosed above is marked as the network stable period; through the above process, the time period corresponding to the part that obviously exceeds the upper limit of network traffic is set as the network peak period, and the network congestion during the network peak period obviously has a greater impact on the signal quality; for example: as the network traffic increases, the transmission distance of light in the optical fiber increases, and the signal strength will naturally decay. This attenuation is an inherent characteristic of optical fiber transmission and has no direct relationship with the size of the traffic. However, when the traffic is large, the signal attenuation has a more significant impact on the overall signal quality; under the condition of large traffic, the optical power density in the optical fiber increases, which may cause nonlinear effects, such as self-phase modulation (SPM), cross-phase modulation (XPM) and four-wave mixing (FWM), etc. These effects will further reduce the signal quality.

[0066] The method for obtaining the fault alarm index is:

[0067] By formula:

[0068]

[0069]

[0070] Calculate and obtain the fault alarm index G;

[0071] in, is the historical fluctuation coefficient, P is the optical power value, Q is the signal quality index, P0 and Q0 are the optical power threshold and signal quality threshold respectively;

[0072] P j is the optical power value obtained by the jth detection, Q j is the signal quality index obtained by the jth detection, are the average values ​​of optical power and signal quality index obtained based on historical data, respectively; n is the total number of detections within a set period of time; It is a preset weight coefficient, which is determined comprehensively based on historical experimental data and empirical data.

[0073] In this embodiment, a method for obtaining a fault alarm index G is provided. First, Calculate the historical fluctuation coefficient. Obviously, the larger the historical fluctuation coefficient of the previous cycle, the higher the probability of failure of the main optical fiber. If the historical fluctuation coefficient is small, if the signal quality index or optical power value of the main optical fiber is slightly lower than the set threshold, it means that there is frequent switching due to the over-sensitivity of the set threshold. Therefore, the historical fluctuation coefficient, real-time optical power value and signal quality index are combined with their respective thresholds to establish The model can obtain a more accurate fault alarm index, which can accurately evaluate the main fiber fault and prevent invalid main and standby fiber switching caused by misjudgment.

[0074] The method for obtaining the set time period is as follows:

[0075] The time point at which the primary fiber failure is initially determined in each successful primary / standby fiber switching action is obtained as the starting time point t ik , the time point at which the master / slave fiber switching instruction is generated is taken as the end time point t ik+1 ;

[0076] By formula:

[0077]

[0078] Calculate and obtain the interval duration ΔT;

[0079] According to the interval length ΔT, the set time period [t ik , t ik +ΔT].

[0080] In this embodiment, the time span between the start time point and the end time point of each main and standby optical fiber switching action is statistically analyzed, and then a reference interval length is obtained by summing and averaging. According to the interval length ΔT, the set time period [t ik , t ik +ΔT], the above process can provide a more accurate data source for the calculation of the historical volatility coefficient and obtain a more precise historical volatility coefficient.

[0081] The process of determining the network interval according to the time point of generating the master / slave fiber switching instruction to determine whether to issue the master / slave fiber switching instruction is as follows:

[0082] By formula:

[0083]

[0084] Calculate and obtain the alarm coefficient F;

[0085] Among them, r is the coefficient corresponding to each network interval, x is the number of times the main optical fiber fault is initially judged in a working cycle, and ρ1, ρ2, and ρ3 are preset proportional coefficients, which are selected and determined based on historical data and experimental data. If the network interval falls into the network peak period, r is 3; if the network interval falls into the network stable period, r is 2; if the network interval falls into the network valley period, r is 1.

[0086] In this embodiment, by Calculate the alarm coefficient F. According to the above formula, the larger the fault alarm index G, the The larger the value of , and r is the coefficient corresponding to each network interval, the larger the network traffic, the higher the possibility of misjudgment. The smaller the value, on the contrary, the larger the fault alarm index G, the smaller the network traffic, the smaller the corresponding coefficient r, and the greater the probability of main fiber failure. The switching frequency can be known according to the total number of main and standby fiber switches in a cycle. Obviously, the higher the switching frequency, the greater the possibility that the set threshold is too sensitive. The above parameters are combined to achieve accurate re-judgment of the main fiber failure and improve the effectiveness of the main and standby fiber switching.

[0087] The method for obtaining the signal quality index Q is:

[0088] Obtain the attenuation value SH, dispersion value SE, and signal-to-noise ratio XI of the main optical fiber through monitoring instruments;

[0089] Substitute the attenuation value SH, dispersion value SE, and signal-to-noise ratio XI into the following formula:

[0090]

[0091] The signal quality index Q is calculated;

[0092] Among them, δ1, δ2, and δ3 are conversion coefficients, which are selected based on comprehensive analysis of historical data and experimental data.

[0093] The attenuation value SH of the current main optical fiber is obtained by the optical time domain reflectometer, the dispersion value SE of the current main optical fiber is obtained by the dispersion tester, and the signal-to-noise ratio XI of the current main optical fiber is obtained by the optical power meter or spectrometer.

[0094] In this embodiment, the attenuation value SH of the current main optical fiber is obtained by detecting with an optical time domain reflectometer, the dispersion value SE of the current main optical fiber is obtained by detecting with a dispersion tester, and the signal-to-noise ratio XI of the current main optical fiber is obtained by detecting with an optical power meter or a spectrometer. The attenuation value SH, the dispersion value SE, and the signal-to-noise ratio XI are substituted into the following formula: The signal quality index Q is calculated; obviously, the smaller the dispersion value and the attenuation value, the better the signal quality, and the larger the signal-to-noise ratio, the better the signal quality. The signal quality model is established through the above parameters, and the accurate signal quality index is calculated.

[0095] A 400G all-optical network based zero insertion loss OLP optical line protection switching device, the device comprising: a memory, a processor, and a 400G all-optical network based zero insertion loss OLP optical line protection switching source program stored in the memory and executable on the processor, the 400G all-optical network based zero insertion loss OLP optical line protection switching source program being configured to implement the 400G all-optical network based zero insertion loss OLP optical line protection switching method.

[0096] It should be noted that the calculation formulas and various parameters involved in the calculation in the present invention have been dimensionally processed in advance, and the process of dimensionless processing is well known in the industry and will not be described here.

[0097] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A 400G all-optical network zero insertion loss OLP optical line protection switching method, characterized in that: The steps include: S1: The optical power monitoring module of the OLP device monitors the optical power and signal quality of the primary and backup optical fibers in real time to obtain the optical power value and signal quality index; S2: Compare the optical power value and signal quality index of the main optical fiber with the corresponding optical power threshold and signal quality threshold respectively. If at least one of the optical power value ≥ optical power threshold or signal quality index ≥ signal quality threshold is met, the main optical fiber is initially judged to be faulty; otherwise, the main optical fiber is judged to be normal; the signal quality index The method to obtain is: Obtain the attenuation value of the main optical fiber through the monitoring instrument , dispersion value , signal-to-noise ratio ; The attenuation value , dispersion value , signal-to-noise ratio Substitute the following formula: ； Calculate the signal quality index ; in, , , is the conversion factor; S3: A fault alarm index is obtained based on a comprehensive analysis of the optical power value and the signal quality index, and the fault alarm index is compared with the fault alarm threshold. If the fault alarm index ≥ the fault alarm threshold, the main optical fiber fault is re-judged and a main-standby optical fiber switching instruction is generated. Otherwise, the main optical fiber is judged to be normal. The method for obtaining the fault alarm index is: By formula: ； ； Calculate the fault alarm index ; in, is the historical volatility coefficient, is the optical power value, is the signal quality index, , are the optical power threshold and signal quality threshold respectively. , is the preset weight coefficient; is the optical power value obtained by the jth detection, is the signal quality index obtained by the jth detection, , are the average values ​​of optical power and signal quality index based on historical data, The total number of tests within a set period of time; S4: judging the network interval according to the time point of generating the master-slave fiber switching instruction to determine whether to issue the master-slave fiber switching instruction, wherein the network interval includes a network peak period, a network stable period, and a network low period; the process of dividing the current main fiber into network intervals is as follows: Obtain the network traffic of the main optical fiber through the network traffic monitoring module; Establish a coordinate system with time as the horizontal axis and network traffic as the vertical axis; The normalization method is used to fit and draw the curve of the network flow of the main optical fiber over time in the coordinate system. ; Get The corresponding time points are marked from left to right as ; Draw two reference curves based on historical data , ,in is the upper limit of normal network traffic. It is the lower limit of normal network traffic; Will be located at Above The area enclosed below is marked as the network peak period. Below The area enclosed above is marked as the network trough period, which will be located at Below The interval enclosed above is marked as the network stable period; S5: After receiving the main-backup optical fiber switching instruction, the main optical fiber is switched to the backup optical fiber. When the main optical fiber returns to normal, the backup optical fiber is switched to the main optical fiber.

2. The method for switching optical line protection based on 400G all-optical network zero insertion loss OLP according to claim 1 is characterized in that: The method for obtaining the set time period is as follows: The time point of initial determination of the main fiber failure in each successful main / standby fiber switching action is obtained as the starting time point The time point at which the master / slave fiber switching instruction is generated is used as the end time point ; By formula: ； Calculate the interval duration ; According to the interval length You can get the set time period .

3. The method for switching optical line protection based on 400G all-optical network zero insertion loss OLP according to claim 1 is characterized in that: The process of determining the network interval according to the time point of generating the master / slave fiber switching instruction to determine whether to issue the master / slave fiber switching instruction is as follows: By formula: ； Calculate the alarm coefficient ; in is the coefficient corresponding to each network interval, is the number of times the main optical fiber fault is initially judged within a working cycle, is the preset scale factor.

4. The method for switching optical line protection based on 400G all-optical network zero insertion loss OLP according to claim 3 is characterized in that: If the network interval you fall into is the network peak period, The value is 3. If the network interval is a stable period, the value is 2. If the network interval is a low period, the value is 1.

5. A 400G all-optical network zero insertion loss OLP optical line protection switching device, characterized in that: The device includes: a memory, a processor, and a 400G all-optical network zero insertion loss OLP optical line protection switching source program stored in the memory and executable on the processor, wherein the 400G all-optical network zero insertion loss OLP optical line protection switching source program is configured to implement the 400G all-optical network zero insertion loss OLP optical line protection switching method according to claim 1.

Images