A method and apparatus for multi-path multiplexing OTDR detection

Abstract

This invention relates to the field of optical time-domain reflectometry (OTDR) technology, and provides a method and apparatus for detecting multipath-multiplexed OTDR signals. Once an abnormal OTDR reflection signal is detected at the common reflection output of a DWDM device, the optical path to be detected corresponding to the current OTDR detection signal period is identified. Based on the pre-calculated ideal detection time for each optical path to be detected, one or more optical paths covered by the acquired OTDR reflection signal are selected. For the selected one or more optical paths to be detected, their respective preset initial periods are adjusted to their corresponding ideal detection times, thus performing a second round of OTDR detection based on the selected results, thereby accurately locating the optical path where the OTDR detection anomaly occurred. This invention automatically adapts by setting different numbers of wavelengths and the period of the emitted signal from a tunable wavelength laser.

Description

[Technical Field]

[0001] This invention relates to the field of optical time-domain reflectometry, and in particular to a multipath multiplexing OTDR detection method and apparatus. [Background Technology]

[0002] In the field of optical time domain reflectance technology, it takes a long time to detect each line individually using a conventional OTDR; although the detection time is shorter if multiple OTDRs are used for simultaneous detection, the preparation time is longer, and multiple OTDRs need to be prepared. Compared with the solution described in this invention, this requires more time and material costs.

[0003] For multi-path line detection, if a coarse wavelength division multiplexing (CWDM) multi-wavelength OTDR module is used, it consists of multiple CWDM OTDR sub-modules of different wavelengths. This multi-wavelength OTDR module occupies a large volume and has many sub-light sources. Using CWDM multiplexing, the number of light sources selected is limited, and the number of lines that can be detected is also limited.

[0004] For multi-path line detection, if a dense wavelength division multiplexing (DWDM) multi-wavelength OTDR module is used, it consists of multiple DWDM OTDR sub-modules with different wavelengths. However, the cost of DWDM wavelength light sources is relatively high compared to DWDM, and the large size is also a problem due to the multiple sub-light sources.

[0005] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. [Summary of the Invention]

[0006] The technical problem this invention aims to solve in the field of optical time-domain reflectometry (OTDR) technology is that probing each line individually using a conventional OTDR is time-consuming; while simultaneous probing with multiple OTDRs shortens the probing time, it requires more preparation time and resources compared to the solution described in this invention. For multi-path line probing, using a coarse wavelength division multiplexing (CWDM) multi-wavelength OTDR module, which consists of multiple CWDM sub-modules of different wavelengths, results in a large volume and numerous sub-light sources. Furthermore, the limited number of light sources and procedurally limited lines that can be probed due to the CWDM multiplexing approach restricts the number of CWDM multiplexing methods. Similarly, using a dense wavelength division multiplexing (DWDM) multi-wavelength OTDR module, which consists of multiple DWDM sub-modules of different wavelengths, also presents the problem of large volume due to the higher cost of DWDM wavelength sources and the large number of sub-light sources.

[0007] The present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides an OTDR detection method for multipath multiplexing, comprising:

[0009] Obtain the optical path distance to be detected that is currently coupled to each output port of the DWDM device, and calculate the ideal detection time required to perfectly complete the corresponding detection optical path based on the optical path distance;

[0010] After the tunable laser is started, the center wavelength of the detection signal of each optical path to be tested is switched according to the preset initial cycle, which is used as the OTDR detection signal emitted in each optical path to be tested.

[0011] Once an abnormal OTDR reflection signal is detected at the common reflection output terminal of the DWDM device, the optical path to be detected corresponding to the current OTDR detection signal cycle is identified, and one or more optical paths to be detected that can be covered by the acquired OTDR reflection signal are selected according to the ideal detection time of each optical path to be detected obtained in advance.

[0012] For the selected one or more optical paths to be tested, adjust their respective preset initial periods to their respective ideal detection times, and perform a second round of OTDR detection on the selected results to accurately locate the optical path where the OTDR detection anomaly has occurred.

[0013] Preferably, the step of selecting one or more optical paths to be detected that can be covered by the acquired OTDR reflection signal, based on the pre-calculated ideal detection time for each corresponding optical path to be detected, specifically includes:

[0014] The starting point for tracing the screening range is based on the moment when an abnormal OTDR reflection signal is received. The ideal detection time corresponding to the detection cycle of the upstream detection optical path is used as the length value of the screening range, thereby constructing the screening range corresponding to each upstream detection optical path.

[0015] Based on the filtering range, the upstream detection optical paths that fall within their respective filtering range at the actual OTDR detection signal transmission time point of their respective detection cycles are identified as the optical paths to be detected covered by the OTDR reflection signal.

[0016] Preferably, after filtering out one or more optical paths to be detected that can be covered by the acquired OTDR reflection signal, the method further includes:

[0017] If the number of optical paths to be tested covered by the OTDR reflection signal exceeds a preset ratio, the preset initial period is adjusted so that the number of optical paths to be tested covered by the OTDR reflection signal falls back to within the preset ratio.

[0018] Preferably, at time t1, the output wavelength of the tunable laser is adjusted to λ1, and a pulse signal of wavelength λ1 is emitted and output to the monitored line 1 through port 1;

[0019] The λ1 optical signal is transmitted in the monitored line 1, and the receiver 1 starts receiving the reflected signal of the λ1 signal light at the common reflection output terminal at time t1.

[0020] The output wavelength of the tunable laser is adjusted to λ2, and after an interval of Δt, a pulse signal of wavelength λ2 is emitted and output to the common detector through the common reflection output terminal.

[0021] The λ2 optical signal is transmitted in the monitored line 2, and the receiver 2 starts receiving the reflected signal of the λ2 signal light at the common reflection output terminal at time t2.

[0022] According to the time sequence, the wavelengths λ3 to λn of the tunable laser are adjusted at t1+2Δt, ..., t1+(n-1)*Δt respectively, and pulse signals of wavelengths λ3 to λn are emitted and output to the common detector through the common reflection output terminal;

[0023] The λ3 to λn signals are transmitted in the monitored lines 3 to n respectively, and the common detector starts to receive the reflected signals of the λ3 to λn signals in their respective lines at times T3 to Tn.

[0024] The Δt is the time interval between sending two wavelength signals, which includes the time for the tunable laser to adjust the wavelength and the waiting time.

[0025] Secondly, the present invention also provides a multipath multiplexing OTDR detection method, comprising:

[0026] Obtain the optical path distance to be detected that is currently coupled to each output port of the DWDM device, and calculate the ideal detection time required to perfectly complete the corresponding detection optical path based on the optical path distance;

[0027] After the tunable laser is started, the center wavelength of the detection signal of each optical path to be tested is switched according to the preset initial cycle, which is used as the OTDR detection signal emitted in each optical path to be tested.

[0028] Once an abnormal OTDR reflection signal is detected at the reflection output end of each optical path to be tested in the DWDM device by a corresponding independently set detector, the optical path where the OTDR detection abnormality occurs can be accurately located.

[0029] Preferably, at time t1, the output wavelength of the tunable laser is adjusted to λ1, and a pulse signal of wavelength λ1 is emitted and output to the monitored line 1 through port 1;

[0030] The λ1 optical signal is transmitted in the monitored line 1, and the receiver 1 starts to receive the reflected signal of the λ1 signal light in the line 1 at time t1.

[0031] The output wavelength of the tunable laser is adjusted to λ2. After a time interval Δt compared to the time interval of λ1, a pulse signal of wavelength λ2 is emitted and output to the monitored line 2 through port 2.

[0032] The λ2 optical signal is transmitted in the monitored line 2, and the receiver 2 starts to receive the reflected signal of the λ2 signal light in the line 2 at time t2.

[0033] According to the time sequence, the wavelengths λ3 to λn of the tunable laser are adjusted at t1+2Δt, ..., t1+(n-1)*Δt respectively, and pulse signals of wavelengths λ3 to λn are emitted and output to the monitored lines 3 to n through ports 3 to n;

[0034] The λ3 to λn signals are transmitted in the monitored lines 3 to n respectively, and the receivers 3 to n begin receiving the reflected signals of the λ3 to λn signals in their respective lines at times T3 to Tn.

[0035] The Δt is the time interval between sending two wavelength signals, which includes the time for the tunable laser to adjust the wavelength and the waiting time.

[0036] Preferably, the method further includes:

[0037] After the transmitter completes the first round of adjustment λ1~λn and outputs the corresponding signal, it repeats the transmission and reception of the transmitted signal with wavelengths λ1~λn again after n*Δt; the number of repetitions is determined by the number of samples required by the OTDR processor to calculate the accurate line events.

[0038] Thirdly, the present invention also includes a multipath multiplexing OTDR detection device, comprising:

[0039] A tunable wavelength laser is used to emit optical signals of different wavelengths in time sequence, λ1 is emitted at t1, λ2 is emitted at t2, ..., λn is emitted at tn;

[0040] There are n receivers, including PD1 to PDn, used to receive the reflected optical signal from the line; at time T1, PD1 receives the reflected signal of λ1, at time T2, PD2 receives the reflected signal of λ2, ..., at time Tn, PDn receives the reflected signal of λn; where n>2.

[0041] A circulator, with port 1 connected to the output of the transmitter, port 2 connected to the input of the wavelength division multiplexing device, and the third port connected to the input of the receiver.

[0042] Preferred options also include:

[0043] The first wavelength division multiplexer (WDM) of 1xn includes a common terminal for transmitting signals of different wavelengths and n output terminals, each of which transmits a signal of a different wavelength. The first WDM is used to receive signals of different wavelengths transmitted by the transmitter and demultiplex them to different output ports. It also receives signals reflected back from different output ports and returns them to port 2 of the circulator.

[0044] The second wavelength division multiplexer (WDM) of 1xn includes a common terminal for transmitting signals of different wavelengths and n output terminals, each of which transmits a signal of a different wavelength. The first wavelength division multiplexer is used to input signal light returning from n lines and separate each wavelength for connection to a separate receiver.

[0045] Fourthly, the present invention also provides a multipath multiplexing OTDR detection apparatus for implementing the multipath multiplexing OTDR detection method described in the first aspect, the apparatus comprising:

[0046] At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the processor for performing the multipath multiplexing OTDR detection method described in the first and second aspects.

[0047] Fifthly, the present invention also provides a non-volatile computer storage medium storing computer-executable instructions that are executed by one or more processors to perform the multipath multiplexing OTDR detection method described in the first aspect.

[0048] This invention does not impose a precise limit on the number of lines that need to be detected. Instead, it automatically adapts to different application scenarios of the lines by setting different numbers of wavelengths of the tunable wavelength laser and the period of the emitted signal. This invention does not limit the length of the n lines, and the length of each line can be different. [Attached Image Description]

[0049] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0050] Figure 1 This is a schematic diagram of a multi-path multiplexing OTDR detection method provided in an embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of a multi-path multiplexing OTDR detection method provided in an embodiment of the present invention;

[0052] Figure 3 This is a schematic diagram of a multi-path multiplexing OTDR detection device provided in an embodiment of the present invention;

[0053] Figure 4 This is a schematic diagram of the scenario architecture applicable to the multi-path multiplexing OTDR detection method provided in this embodiment of the invention;

[0054] Figure 5 This is a schematic diagram of a multi-path multiplexing OTDR detection method provided in an embodiment of the present invention;

[0055] Figure 6 This is a schematic diagram of a multi-path multiplexing OTDR detection device provided in an embodiment of the present invention;

[0056] Figure 7 This is a schematic diagram of a multi-path multiplexing OTDR detection device provided in an embodiment of the present invention;

[0057] Figure 8 This is a schematic diagram of a multi-path multiplexing OTDR detection device provided in an embodiment of the present invention.

Detailed Implementation Methods

[0058] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0059] In the description of this invention, the terms "inner", "outer", "longitudinal", "lateral", "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and do not require that this invention must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0060] In the technical problem scenario proposed in this invention, if an integrated tunable laser module with a tunable laser and an optical switch is used, theoretically, the wavelength of the tunable laser can be adjusted in timing, and then switched to different lines via the optical switch. However, the number of lines that the optical switch can switch is limited, and the optical switch has an adjustment time. Matching the adjustment time with the emission timing of the tunable laser source brings difficulties to practical use.

[0061] This invention employs a tunable laser combined with DWDM devices for wave combining and wave splitting to transmit different wavelengths to different lines. DWDM is a passive device, eliminating the need for switching, resulting in higher reliability and timeliness.

[0062] This invention does not impose a precise limit on the number of lines that need to be detected. Instead, it automatically adapts to different application scenarios of the lines by setting different wavelengths of the tunable laser and the period of the emitted signal. This invention does not limit the length of the n lines, and the length of each line can be different.

[0063] Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0064] Example 1:

[0065] Embodiment 1 of the present invention provides an OTDR detection method for multipath multiplexing, such as Figure 1 As shown, it includes:

[0066] In step 201, the optical path distance to be detected coupled to each output port of the DWDM device is obtained, and the ideal detection time required to perfectly complete the corresponding detection optical path is calculated based on the optical path distance.

[0067] The ideal detection time is the OTDR signal transmission time calculated with the farthest end of the optical path as the reflection node.

[0068] In step 202, after the tunable laser is started, the center wavelength of the detection signal of each optical path to be tested is switched according to a preset initial period, and used as the OTDR detection signal emitted in each optical path to be tested.

[0069] The preset initial period can be calculated based on the average time for OTDR detection to be completed in the historical optical path, or it can be set based on the time required to complete OTDR retrieval with the shortest optical path distance. Each has its own advantages and characteristics, and can be set according to actual needs.

[0070] In step 203, once an abnormal OTDR reflection signal is detected at the common reflection output terminal of the DWDM device, the optical path to be detected corresponding to the current OTDR detection signal cycle is identified, and one or more optical paths to be detected that can be covered by the acquired OTDR reflection signal are selected according to the ideal detection time of each optical path to be detected obtained in advance.

[0071] In step 204, for the selected one or more optical paths to be tested, their respective preset initial periods are adjusted to their respective ideal detection times, thereby performing a second round of OTDR detection on the screening results, so as to accurately locate the optical path where the OTDR detection anomaly occurs.

[0072] This invention does not impose a precise limit on the number of lines that need to be detected. Instead, it automatically adapts to different application scenarios of the lines by setting different numbers of wavelengths of the tunable wavelength laser and the period of the emitted signal. This invention does not limit the length of the n lines, and the length of each line can be different.

[0073] In conjunction with embodiments of the present invention, based on the pre-calculated ideal detection time for each optical path to be detected, one or more optical paths to be detected that can be covered by the acquired OTDR reflection signal are selected, such as... Figure 2 As shown, it specifically includes:

[0074] In step 301, the starting point for tracing the screening range is based on the moment when the abnormal OTDR reflection signal is received, and the length value of the screening range is based on the ideal detection time corresponding to the detection cycle of the upstream detection optical path, thereby constructing the screening range corresponding to each upstream detection optical path.

[0075] In step 302, based on the filtering range, the upstream detection optical paths that fall into their respective filtering range at the actual OTDR detection signal transmission time point of their respective detection cycles are identified as the optical paths to be detected covered by the OTDR reflection signal.

[0076] In this embodiment of the invention, after filtering out one or more optical paths to be detected that are covered by the OTDR reflection signal that can be acquired, the method further includes:

[0077] If the number of optical paths to be tested covered by the OTDR reflection signal exceeds a preset ratio, the preset initial period is adjusted so that the number of optical paths to be tested covered by the OTDR reflection signal falls back to within the preset ratio.

[0078] by Figure 3 The structure shown is used as a scene description. At time t1, the output wavelength of the tunable laser is adjusted to λ1, and a pulse signal of wavelength λ1 is emitted and output to the monitored line 1 through port 1.

[0079] The λ1 optical signal is transmitted in the monitored line 1, and the receiver 1 starts receiving the reflected signal of the λ1 signal light at the common reflection output terminal at time t1.

[0080] The output wavelength of the tunable laser is adjusted to λ2, and after an interval of Δt, a pulse signal of wavelength λ2 is emitted and output to the common detector through the common reflection output terminal.

[0081] The λ2 optical signal is transmitted in the monitored line 2, and the receiver 2 starts receiving the reflected signal of the λ2 signal light at the common reflection output terminal at time t2.

[0082] According to the time sequence, the wavelengths λ3 to λn of the tunable laser are adjusted at t1+2Δt, ..., t1+(n-1)*Δt respectively, and pulse signals of wavelengths λ3 to λn are emitted and output to the common detector through the common reflection output terminal;

[0083] The λ3 to λn signals are transmitted in the monitored lines 3 to n respectively, and the common detector starts to receive the reflected signals of the λ3 to λn signals in their respective lines at times T3 to Tn.

[0084] The Δt is the time interval between sending two wavelength signals, which includes the time for the tunable laser to adjust the wavelength and the waiting time.

[0085] like Figure 4 The diagram illustrates the application scenario applicable to the embodiments of the present invention. If each line is detected individually using a conventional OTDR, the time required is considerable. While simultaneous detection using multiple OTDRs results in a shorter detection time, the preparation time is longer, requiring the preparation of multiple OTDRs, which necessitates more time and material costs compared to the solution described in this invention. For multi-path line detection, if a coarse wavelength division multiplexing (CWDM) multi-wavelength OTDR module is used, it comprises multiple CWDM sub-modules of different wavelengths, resulting in a large volume and numerous sub-light sources. Furthermore, the CWDM multiplexing method limits the number of light sources that can be selected, consequently limiting the number of lines that can be detected.

[0086] For multi-path line detection, if a dense wavelength division multiplexing (DWDM) multi-wavelength OTDR module is used, it consists of multiple DWDM sub-modules with different wavelengths. However, the cost of DWDM wavelength sources is relatively high compared to DWDM, and the large size due to the multiple sub-sources also presents challenges. If an Integrable Tunable Laser Assembly (ITLA) with an optical switch is used, theoretically, the wavelength of the ITLA can be adjusted in time, and then switched to different lines via the optical switch. However, the number of paths that the optical switch can switch is limited, and the adjustment time of the optical switch, along with the timing of the ITLA's emission, presents difficulties in practical application. A better approach is to use an ITLA with DWDM devices for multiplexing and demultiplexing to transmit different wavelengths to different lines. DWDM is a passive device, eliminating the need for switching, resulting in higher reliability and timeliness.

[0087] This invention does not impose a precise limit on the number of lines that need to be detected. It automatically adapts to different application scenarios of the lines by setting different numbers of wavelengths and the period of the transmitted signal. This invention does not limit the length of the n lines, and the length of each line can be different.

[0088] Example 2:

[0089] This invention also provides a multi-path multiplexing OTDR detection method. Compared to Embodiment 1, the cost of this invention is higher, but the process is relatively simpler. Figure 5 As shown, it includes:

[0090] In step 401, the optical path distance to be detected coupled to each output port of the DWDM device is obtained, and the ideal detection time required to perfectly complete the corresponding detection optical path is calculated based on the optical path distance.

[0091] In step 402, after the tunable laser is started, the center wavelength of the detection signal of each optical path to be tested is switched according to a preset initial period, and used as the OTDR detection signal emitted in each optical path to be tested.

[0092] In step 403, once an abnormal OTDR reflection signal is detected by a corresponding independently set detector at the reflection output end of each optical path to be tested in the DWDM device, the optical path where the OTDR detection abnormality occurs can be accurately located.

[0093] This invention does not impose a precise limit on the number of lines that need to be detected. Instead, it automatically adapts to different application scenarios of the lines by setting different numbers of wavelengths of the tunable wavelength laser and the period of the emitted signal. This invention does not limit the length of the n lines, and the length of each line can be different.

[0094] refer to Figure 6 In the example scenario shown, at time t1, the output wavelength of the tunable laser is adjusted to λ1, and a pulse signal of wavelength λ1 is emitted and output to the monitored line 1 through port 1.

[0095] The λ1 optical signal is transmitted in the monitored line 1, and the receiver 1 starts to receive the reflected signal of the λ1 signal light in the line 1 at time t1.

[0096] The output wavelength of the tunable laser is adjusted to λ2. After a time interval Δt compared to the time interval of λ1, a pulse signal of wavelength λ2 is emitted and output to the monitored line 2 through port 2.

[0097] The λ2 optical signal is transmitted in the monitored line 2, and the receiver 2 starts to receive the reflected signal of the λ2 signal light in the line 2 at time t2.

[0098] According to the time sequence, the wavelengths λ3 to λn of the tunable laser are adjusted at t1+2Δt, ..., t1+(n-1)*Δt respectively, and pulse signals of wavelengths λ3 to λn are emitted and output to the monitored lines 3 to n through ports 3 to n;

[0099] The λ3 to λn signals are transmitted in the monitored lines 3 to n respectively, and the receivers 3 to n begin receiving the reflected signals of the λ3 to λn signals in their respective lines at times T3 to Tn.

[0100] The Δt is the time interval between sending two wavelength signals, which includes the time for the tunable laser to adjust the wavelength and the waiting time.

[0101] After the transmitter completes the first round of adjustment λ1~λn and outputs the corresponding signal, it repeats the transmission and reception of the transmitted signal with wavelengths λ1~λn again after n*Δt; the number of repetitions is determined by the number of samples required by the OTDR processor to calculate the accurate line events.

[0102] Example 3:

[0103] like Figure 6 As shown, this embodiment of the invention also provides a multi-path multiplexing OTDR detection device, comprising:

[0104] A tunable wavelength laser is used to emit optical signals of different wavelengths in time sequence, λ1 is emitted at t1, λ2 is emitted at t2, ..., λn is emitted at tn;

[0105] There are n receivers, including PD1 to PDn, used to receive the reflected optical signal from the line; at time T1, PD1 receives the reflected signal of λ1, at time T2, PD2 receives the reflected signal of λ2, ..., at time Tn, PDn receives the reflected signal of λn; where n>2.

[0106] A circulator, with port 1 connected to the output of the transmitter, port 2 connected to the input of the wavelength division multiplexing device, and the third port connected to the input of the receiver.

[0107] This invention does not impose a precise limit on the number of lines that need to be detected. Instead, it automatically adapts to different application scenarios of the lines by setting different numbers of wavelengths of the tunable wavelength laser and the period of the emitted signal. This invention does not limit the length of the n lines, and the length of each line can be different.

[0108] Furthermore, in this embodiment of the invention, a 1xn first wavelength division multiplexer is also provided, including a common terminal for transmitting signals of different wavelengths, and n output terminals, each output port transmitting signals of different wavelengths; the first wavelength division multiplexer is used to receive signals of different wavelengths transmitted by the transmitter, and demultiplex them to different output ports; it also receives signals reflected back from different output ports and returns them to port 2 of the circulator.

[0109] The second wavelength division multiplexer (WDM) of 1xn includes a common terminal for transmitting signals of different wavelengths and n output terminals, each of which transmits a signal of a different wavelength. The first wavelength division multiplexer is used to input signal light returning from n lines and separate each wavelength for connection to a separate receiver.

[0110] like Figure 7 As shown, when there are too many lines, the topology can be changed by using an optical switch SOW. This expansion configuration scheme is also applicable to Example 1.

[0111] Example 4:

[0112] like Figure 8 The diagram shown is an architectural schematic of a multipath multiplexing OTDR detection device according to an embodiment of the present invention. This multipath multiplexing OTDR detection device includes one or more processors 21 and a memory 22. Figure 8 Take a processor 21 as an example.

[0113] Processor 21 and memory 22 can be connected via a bus or other means. Figure 8 Taking the example of a connection between China and Israel via a bus.

[0114] The memory 22, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs and non-volatile computer-executable programs, such as the multipath-multiplexed OTDR detection method in Embodiment 1. The processor 21 executes the multipath-multiplexed OTDR detection method by running the non-volatile software programs and instructions stored in the memory 22.

[0115] Memory 22 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 22 may optionally include memory remotely located relative to processor 21, which can be connected to processor 21 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0116] The program instructions / modules are stored in the memory 22. When executed by one or more processors 21, they perform the multipath multiplexing OTDR detection method described in Embodiment 1 above, for example, the method described above. Figure 1 , Figure 2 and Figure 5 The steps shown.

[0117] It is worth noting that the information interaction and execution process between the modules and units in the above-mentioned device and system are based on the same concept as the processing method embodiment of the present invention. For details, please refer to the description in the method embodiment of the present invention, and will not be repeated here.

[0118] Those skilled in the art will understand that all or part of the steps in the various methods of the embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, which may include: read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, etc.

[0119] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multipath multiplexed OTDR detection method, characterized in that, The method comprises the following steps: acquiring the optical path distance of each to-be-detected optical path coupled to each output port of the DWDM device, and calculating the ideal detection time required for theoretically completing the corresponding detection optical path according to the optical path distance; wherein the ideal detection time is the OTDR signal transmission time calculated by taking the farthest end of the optical path as the reflection node; after starting the tunable laser, the center wavelength of the detection signal introduced into each to-be-detected optical path is switched according to a preset initial period, serving as the OTDR detection signal emitted in each to-be-detected optical path; once an abnormal OTDR reflection signal is detected at the common reflection output end of the DWDM device, the to-be-detected optical path corresponding to the current OTDR detection signal period is confirmed, and one or more to-be-detected optical paths covered by the OTDR reflection signal that can be acquired are screened out according to the ideal detection time of each to-be-detected optical path calculated in advance; for the one or more to-be-detected optical paths screened out, the preset initial period of each is adjusted to the ideal detection time corresponding to each, so as to perform a second round of OTDR detection on the screening result, thereby accurately locating the optical path where the OTDR detection abnormality occurs.

2. The multiplexed OTDR detection method of claim 1, wherein, The screening of the one or more to-be-detected optical paths covered by the OTDR reflection signal that can be acquired according to the ideal detection time of each to-be-detected optical path calculated in advance comprises the following steps: taking the time when the abnormal OTDR reflection signal is currently received as the starting point of the screening range, and taking the ideal detection time corresponding to the detection period of the upstream detection optical path as the length value of the screening range, so as to construct the screening range corresponding to each upstream detection optical path; if the actual emission OTDR detection signal time point of the corresponding detection optical path in the detection period falls into the upstream detection optical path of the corresponding screening range, the to-be-detected optical path is classified as the to-be-detected optical path covered by the OTDR reflection signal.

3. The multiplexed OTDR detection method of claim 2, wherein, After the one or more to-be-detected optical paths covered by the OTDR reflection signal that can be acquired are screened out, the method further comprises the following steps: if the number of to-be-detected optical paths covered by the OTDR reflection signal exceeds a preset proportion value, the preset initial period is adjusted, so that the number of to-be-detected optical paths covered by the OTDR reflection signal falls within the preset proportion value.

4. The multipath multiplexed OTDR detection method of any of claims 1-3, wherein, At t1, the output wavelength of the tunable laser is adjusted to λ1, and a pulse signal of wavelength λ1 is emitted and output to the monitored line 1 through port 1; The λ1 optical signal is transmitted in the monitored line 1, and the receiver 1 starts to receive the reflection signal of the λ1 signal light in the common reflection output end at t1; The output wavelength of the tunable laser is adjusted to λ2, and a pulse signal of wavelength λ2 is emitted and output to the common detector through the common reflection output end after an interval of Δt; The λ2 optical signal is transmitted in the monitored line 2, and the receiver 2 starts to receive the reflection signal of the λ2 signal light in the common reflection output end at t2; According to time sequence, respectively at t1+2Δt, ……t1+ (n-1) *Δt, respectively adjust the wavelength λ3~λn of the tunable laser, and emit pulse signals of λ3~λn wavelengths, output to the common detector through the common reflection output end; The λ3~λn signals are transmitted in the monitored line 3~line n respectively, and the common detector starts to receive the reflection signals of the λ3~λn signals in the respective lines at T3~Tn time; The Δt is the time interval between the transmission of two wavelength signals, which includes the time for the tunable laser to adjust the wavelength, and the waiting time.

5. A method of multipath multiplexed OTDR detection, the method comprising: It comprises: Obtaining the optical path distance to be detected currently coupled with each output port of the DWDM device, and calculating the ideal detection time required for theoretically completing the corresponding detection optical path according to the optical path distance; After starting the tunable laser, the center wavelength of the detection signal introduced into each of the to-be-detected optical paths is switched according to a preset initial period, as the OTDR detection signal emitted in each to-be-detected optical path; Once the abnormal OTDR reflection signal is detected by the corresponding independently set detector at the reflection output end of the DWDM device corresponding to each to-be-detected optical path, the optical path where the OTDR detection abnormality occurs is accurately located; At t1 time, the output wavelength of the tunable laser is adjusted to λ1, and a pulse signal of λ1 wavelength is emitted and output to the monitored line 1 through port 1; The λ1 optical signal is transmitted in the monitored line 1, and the receiver 1 starts to receive the reflection signal of the λ1 signal light in the line 1 at t1 time; The output wavelength of the tunable laser is adjusted to λ2, and after an interval Δt time compared with the time of emitting λ1, a pulse signal of λ2 wavelength is emitted and output to the monitored line 2 through port 2; The λ2 optical signal is transmitted in the monitored line 2, and the receiver 2 starts to receive the reflection signal of the λ2 signal light in the line 2 at t2 time; According to time sequence, respectively at t1+2Δt, ……t1+ (n-1) *Δt, respectively adjust the wavelength λ3~λn of the tunable laser, and emit pulse signals of λ3~λn wavelengths, output to the common detector through the common reflection output end; The λ3~λn signals are transmitted in the monitored line 3~line n respectively, and the common detector starts to receive the reflection signals of the λ3~λn signals in the respective lines at T3~Tn time; The Δt is the time interval between the transmission of two wavelength signals, which includes the time for the tunable laser to adjust the wavelength, and the waiting time.

6. The multiplexed OTDR method of claim 5, wherein, The method further comprises: After the transmitter completes the first adjustment of λ1~λn and outputs the corresponding signals, the wavelength λ1~λn is repeatedly transmitted and the signal is received again after n*Δt; wherein the number of repetitions is determined according to the number of samples required by the OTDR processor to calculate the accurate line event.

7. A multipath multiplexed OTDR detection apparatus, characterized by, The device comprises: At least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the processor to perform the multi-path multiplexed OTDR detection method of any one of claims 1-6.

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