A multi-channel optical link adaptive detection method and device

Abstract

The present invention proposes a multi-channel optical link adaptive detection method and device thereof. The method comprises: in response to a start instruction sent by a controller module, using a first optical time domain reflectometer to monitor the plugging status of optical connectors in multiple channels in a preset order through a wavelength division multiplexer; when the first optical time domain reflectometer obtains feedback data, the controller module generates a connection instruction corresponding to the successfully connected optical connector; using a second optical time domain reflectometer to sequentially detect multiple optical fiber links where the successfully connected optical connector is located; and sequentially completing the interpretation of the plugging status of the optical link of each channel. The present invention adopts dual OTDRs working in collaboration to realize multi-channel optical link adaptive detection. The two OTDR modules use different laser wavelengths and work in parallel without interfering with each other. The first OTDR module completes dynamic monitoring of optical link changes, and the second OTDR module detects the channel according to the output channel number of the first OTDR.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber links, and in particular to a multi-channel optical link adaptive detection method and device thereof. Background Art

[0002] Fiber optic links are essential infrastructure in optical communication networks, and testing them is essential for the installation, commissioning, and maintenance of these facilities. An optical time domain reflectometer (OTDR) is a typical fiber optic link testing device. It can be used to test the entire link from one end, locating connection points, fault points, and defects. OTDRs exist, including general-purpose OTDRs and specialized OTDRs. General-purpose OTDRs are used for testing common fiber optic communication links, while specialized OTDRs are designed for testing fiber optic cables in specialized environments, such as ultra-short and ultra-long fibers, in high-temperature environments, and in dust-contaminated environments.

[0003] However, multi-channel optical links are common in fiber optic networks. Testing multi-channel optical links using existing optical time domain reflectometers (OTDRs) typically involves manual switching. After each group is tested, the connectors are manually switched until all links are tested. This is a relatively cumbersome process.

[0004] With the continuous development of fiber-optic communication technology, its application areas are gradually expanding. Optical link applications in optical switching networks and related fields are experiencing rapid growth. Optical network switching equipment utilizes a large number of optical link connections and switching devices. Frequent and repeated patching of optical connections is a common task during installation, commissioning, testing, repair, and maintenance. Single-channel OTDRs are unable to meet the increasingly complex testing needs of optical networks.

[0005] During the on-orbit installation of optical fiber links on spacecraft payloads, it's necessary to verify the integrity of connectors. An OTDR is required as an auxiliary device to monitor connector installation status. Optical link testing must not only be automated but also include adaptive random connector connection detection. Existing OTDRs struggle to meet the testing requirements of multi-channel optical links in space environments.

[0006] In addition, existing OTDRs and existing patents are difficult to meet the needs of multi-channel optical link detection in other harsh environments such as high temperature, low temperature, pollution, etc. that are not suitable for operators to work in. Summary of the Invention

[0007] The technical problem to be solved by the present invention is how to switch the optical path by optical switches and optical wavelength division multiplexers to achieve adaptive detection of multiple groups of optical fiber links in an unmanned environment. In view of this, the present invention provides a multi-channel optical link adaptive detection method and device.

[0008] The technical solution adopted by the present invention is that a multi-channel optical link includes at least two channels, each channel includes a secondary optical switch, a wavelength division multiplexer, and an optical connector. The multi-channel optical link adaptive detection method includes:

[0009] Step S1, in response to a start instruction sent by the controller module, using a first optical time domain reflectometer, turning on a first primary optical switch, and monitoring the plugging status of sub-optical connectors in multiple channels in a preset order through a wavelength division multiplexer;

[0010] Step S2: When a connection characteristic value indicating successful plugging appears at a corresponding position in the feedback data obtained by the first optical time domain reflectometer, the controller module generates a connection instruction corresponding to the successfully connected optical connector;

[0011] Step S3: In response to the connection instruction sent by the controller module, the second-level optical switch is driven to switch the detection light of the second optical time domain reflectometer to the second-level optical switch corresponding to the connection instruction, and the second optical time domain reflectometer is used to sequentially detect multiple optical fiber links where the successfully connected optical connector is located. At the same time, the first-level optical switch is driven to switch the detection signal of the first optical time domain reflectometer to each wavelength division multiplexer in a different channel from the successfully connected optical connector, and the cycle is repeated.

[0012] Step S4, feeding back the received data of the second optical time domain reflectometer to the controller module, and sending the data to an external device through a data exchange module, wherein the external device is used to complete the determination of the connection status;

[0013] Step S5: In response to the obtained reading result, the connection status of the optical link of each channel is read in sequence.

[0014] In one embodiment, the laser power of the first optical time domain reflectometer is P1, where P1 satisfies 1mW≤P1≤20mW, the laser wavelength is λ1, where λ1 satisfies 500nm≤λ1≤1650nm, the detection range is L1, where L1 includes L1=100m, 400m, 1000m, 5000m, and the minimum distance resolution is δ1=50mm.

[0015] In one embodiment, the laser power of the second optical time domain reflectometer is P2, where P2 satisfies 1mW≤P2≤20mW, the laser wavelength is λ2, where λ2 satisfies 500nm≤λ2≤1650nm and |λ2-λ1|≥10nm, the detection range is L2, where L2=L1, and the minimum distance resolution is δ2, where δ2=δ1.

[0016] In one embodiment, the first-level optical switch and the second-level optical switch are one-input and eight-output optical switches, and the second-level optical switches are all one-input and eight-output optical switches.

[0017] In one embodiment, the forward direction of the optical wavelength division multiplexer is a two-input one-output optical wave combiner, and the reverse direction is a one-input two-output optical wave splitter;

[0018] Wherein, when the optical wavelength division multiplexer is in the forward direction, the detection light with a wavelength of λ1 from the first optical time domain reflectometer and the detection light with a wavelength of λ2 from the second optical time domain reflectometer pass through the optical wavelength division multiplexer without affecting each other and enter the first inlet channel of the corresponding optical fiber connector;

[0019] Furthermore, when the optical wavelength division multiplexer is in the forward direction, the reflected echo signal from the optical fiber link where the first channel of the optical fiber connector is located is separated from the corresponding optical wavelength division multiplexer into two beams of light with wavelengths λ1 and λ2. The optical signal with wavelength λ1 returns to the first optical time domain reflectometer, and the optical signal with wavelength λ2 returns to the second optical time domain reflectometer.

[0020] In one embodiment, the first output channel of the secondary optical switch is respectively connected to the second input channel of the optical wavelength division multiplexer, and the second to eighth output channels of the secondary optical switch are respectively connected to the second to eighth input channels of the optical fiber connector, wherein the signal light output by the second optical time domain reflectometer can be switched in all output channels of different secondary optical switches.

[0021] In one embodiment, the data exchange module is an IO interface.

[0022] Another aspect of the present invention further provides a multi-channel optical link adaptive detection device, comprising:

[0023] A controller module, a processor module, a data exchange module, a first optical time domain reflectometer, a second optical time domain reflectometer, a first primary optical switch, a second primary optical switch, a secondary optical switch, an optical wavelength division multiplexer, and an optical fiber connector module. In response to a control instruction from the controller module, the processor module is configured to utilize the first optical time domain reflectometer and the second optical time domain reflectometer to implement the multi-channel optical link adaptive detection method as described in any one of the above items.

[0024] Another aspect of the present invention provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the multi-channel optical link adaptive detection method as described in any one of the above items.

[0025] Another aspect of the present invention further provides a computer storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the multi-channel optical link adaptive detection method as described above are implemented.

[0026] Compared with the prior art, the present invention has at least the following advantages:

[0027] The present invention provides a multi-channel optical link adaptive detection method, which realizes multi-channel optical link adaptive detection by using dual OTDRs working in collaboration. The two OTDR modules use different laser wavelengths and work in parallel without interfering with each other. The first OTDR module dynamically monitors optical link changes, and the second OTDR module detects the channel according to the output channel number of the first OTDR.

[0028] Based on the embodiments of the present invention, continuous automatic detection of multiple channels can be achieved without the need for personnel to repeatedly plug and unplug connectors. In addition, the method realizes parallel processing of monitoring and testing, and the status of other connectors can continue to be monitored during the test process, thereby solving the problem that the status monitoring and testing of a single OTDR module cannot be carried out in parallel and the problem that testing is difficult in unattended conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Flowchart of a multi-channel optical link adaptive detection method according to an embodiment of the present invention;

[0030] Figure 2 is an overall logic flow chart of a multi-channel optical link adaptive detection method according to an embodiment of the present invention;

[0031] Figure 3 2. A structural diagram of a multi-channel optical link adaptive detection device according to an embodiment of the present invention;

[0032] Figure 4 1 is a structural state diagram of a multi-channel optical link adaptive detection device according to an embodiment of the present invention (D1 channel connector is connected);

[0033] Figure 5 1 is a structural state diagram of a multi-channel optical link adaptive detection device according to an embodiment of the present invention (D2 channel connector is connected);

[0034] Figure 6 FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose, the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0036] In the accompanying drawings, the thickness, size and shape of objects have been slightly exaggerated for ease of explanation. The accompanying drawings are only examples and are not drawn strictly to scale.

[0037] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, integers, steps, operations, elements, and / or parts, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0038] As used herein, the terms "substantially," "approximately," and similar terms are used as terms of approximation, not degree, and are intended to account for the inherent variations in measurements or calculations that would be recognized by those having ordinary skill in the art.

[0039] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should 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 technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0040] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] The description of the method flow in the specification and the steps in the flowcharts in the drawings of the specification do not necessarily need to be strictly executed according to the step numbers. The method steps may be executed in a different order. Furthermore, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0042] The first embodiment of the present invention is a multi-channel optical link adaptive detection method, such as Figure 1 As shown, the following specific steps are included:

[0043] Step S1, in response to a start instruction sent by the controller module, using a first optical time domain reflectometer, turning on a first primary optical switch, and monitoring the plugging status of sub-optical connectors in multiple channels in a preset order through a wavelength division multiplexer;

[0044] Step S2: When a connection characteristic value indicating successful plugging appears at a corresponding position in the feedback data obtained by the first optical time domain reflectometer, the controller module generates a connection instruction corresponding to the successfully connected optical connector;

[0045] Step S3: In response to the connection instruction sent by the controller module, the second-level optical switch is driven to switch the detection light of the second optical time domain reflectometer to the second-level optical switch corresponding to the connection instruction, and the second optical time domain reflectometer is used to sequentially detect multiple optical fiber links where the successfully connected optical connector is located. At the same time, the first-level optical switch is driven to switch the detection signal of the first optical time domain reflectometer to each wavelength division multiplexer in a different channel from the successfully connected optical connector, and the cycle is repeated.

[0046] Step S4, feeding back the received data of the second optical time domain reflectometer to the controller module, and sending the data to an external device through a data exchange module, wherein the external device is used to complete the determination of the connection status;

[0047] Step S5: In response to the obtained reading result, the connection status of the optical link of each channel is read in sequence.

[0048] For reference Figure 1 or Figure 2 , the method provided in this embodiment will be described in detail below.

[0049] For the sake of simplicity, the first primary optical switch is denoted as the first-stage optical switch A1, the second primary optical switch is denoted as the first-stage optical switch A2, and different secondary optical switches are denoted as Bi (i=1, 2, 3, 4, 5, 6, 7, 8).

[0050] Driven by the controller module (CPU), the first optical time domain reflectometer (OTDR-1) works with the first-stage optical switch A1 to sequentially detect the first channel of the eight optical connectors. The detection sequence is D1-1 -> D2-1 -> D3-1 -> D4-1 -> D5-1 -> D6-1 -> D7-1 -> D8-1 -> D1-1 -> ..., and the time required to complete one channel detection is t (including the optical switch switching time). During the detection process, the controller module processes and interprets the test results of the first optical time domain reflectometer in real time. When the typical characteristics of the connector appear at the corresponding measurement point in the test data, it indicates that the connector Di (i = 1, 2, 3, 4, 5, 6, 7, 8) on the current optical path of the OTDR-1 has been connected.

[0051] The controller module (CPU) turns on the second optical time domain reflectometer (OTDR-2). The controller module sends the number of Di to the processor module (FPGA). The processor module drives the first-stage optical switch A2 to switch the optical path of the second optical time domain reflectometer (OTDR-2) to the second-stage optical switch Bi (i = 1, 2, 3, 4, 5, 6, 7, 8). OTDR-2 tests channels 1, 2, 3, 4, 5, 6, 7, and 8 of the Di connector in sequence until all channels of Di are tested. At the same time, the control program automatically removes the detection of channel i. The FPGA drives the first-stage optical switch (A1) to switch the optical path of OTDR-1 to the optical wavelength division multiplexer Cj (j = 1, 2, 3, 4, 5, 6, 7, 8 and j ≠ i). OTDR-1 continues The controller periodically checks whether the connectors other than Di are connected. When the controller module (CPU) determines that the OTDR-2 has completed testing Di data and that a Dj (j=1, 2, 3, 4, 5, 6, 7, 8 and j≠i) connector has been connected, the controller sends the Dj number to the FPGA. The FPGA drives the first-stage optical switch A2 to switch the optical path of the second optical time domain reflectometer (OTDR-2) to the second-stage optical switch Bj (i=1, 2, 3, 4, 5, 6, 7, 8 and j≠i). The OTDR-2 tests channels 1, 2, 3, 4, 5, 6, 7, and 8 of the Dj (j≠i) connector in sequence until all channels of the Dj connector are tested. The same process is repeated until the OTDR-2 completes testing of all optical fibers.

[0052] During the test process, after the OTDR-2 completes a set of tests (all 8 optical fiber links corresponding to one connector are tested), the controller module sends the OTDR-2 test results to the data exchange module (IO) in real time. The IO obtains the data and sends it to the external device (CT). After the external device automatically or manually interprets it, it returns the result of whether the Di (i = 1, 2, 3, 4, 5, 6, 7, 8) connector connection is abnormal.

[0053] If there is no abnormality in the connection of Di connector (Di is marked as completed detection), the external device returns the identification of normal connection of Di connector, and OTDR-2 ends the test of the optical link where the current connector Di is located. When any other group of connectors is plugged in, it will automatically trigger OTDR-1 to obtain the position number of the connector, and continue to trigger OTDR-2 to start testing each optical link channel corresponding to the connector.

[0054] If the Di connector connection is abnormal (Di is marked as incomplete detection), the external device returns an indication of the Di connector connection abnormality. The control program automatically adds channel i to the channel number sequence of A1. In the next round of detection, the FPGA drives OTDR-1 and the first-stage optical switch A1 to scan and detect the first channel of Di. The operator receives an instruction to reconnect the Di connector. When the Di connector is reconnected, the controller module (CPU) sends an instruction to detect Di again according to the above procedure. The controller sends the Di number to the FPGA, and OTDR-2 repeats the above process until the Di connector connection is normal.

[0055] According to the above process, when all connectors are connected and the OTDR-2 detects all channels as normal, OTDR-2 and OTDR-1 are turned off in sequence, and the task is completed.

[0056] The second embodiment of the present invention is a multi-channel optical link adaptive detection device, which can be referred to Figures 3 to 5 , used to implement the method provided in the first embodiment, comprising a controller module, a processor module, an optical time domain reflectometer module, an optical switch module, an optical wavelength division multiplexer module, a data exchange module, and an optical connector module. It is characterized in that:

[0057] Specifically, the device includes a controller module (CPU), a processor module (FPGA), a data exchange module (IO), a first optical time domain reflectometer (OTDR-1), a second optical time domain reflectometer (OTDR-2), a first-stage optical switch (A1, A2), a second-stage optical switch (B1, B2, B3, B4, B5, B6, B7, B8), an optical wavelength division multiplexer (C1, C2, C3, C4, C5, C6, C7, C8), and an optical fiber connector module (D1, D2, D3, D4, D5, D6, D7, D8);

[0058] Specifically, the controller module (CPU) is used to control the operation of the optical time domain reflectometer, optical switch, processor module, and data exchange module system of the device;

[0059] Specifically, the processor module (FPGA) is used to drive the first optical time domain reflectometer (OTDR-1) and the second optical time domain reflectometer (OTDR-2) to emit optical signals in real time, receive and process data collected by the time domain reflectometers in real time, drive the optical switch in real time, and send data processing results in real time;

[0060] Specifically, the data exchange module (IO) is used to receive instructions from external devices and send data to external devices;

[0061] Specifically, the first optical time domain reflectometer (OTDR-1) is controlled by the controller module (CPU) to turn on / off the detection function, with a laser power of P1 (1 mW ≤ P1 ≤ 20 mW), a laser wavelength of λ1 (500 nm ≤ λ1 ≤ 1650 nm), a detection range of L1 (L1 = 100 m, 400 m, 1000 m, 5000 m), and a minimum distance resolution of δ1 = 50 mm.

[0062] Specifically, the second optical time domain reflectometer (OTDR-2) is turned on / off by the controller module (CPU), the laser power is P2 (1mW≤P2≤20mW), the laser wavelength is λ2 (500nm≤λ2≤1650nm and |λ2-λ1|≥10nm), the detection range is L2 (L2=L1), and the minimum distance resolution is δ2 (δ2=δ1);

[0063] Specifically, the first-stage optical switches (A1, A2) are one-input and eight-output optical switches, and the processor module (FPGA) drives the channel selection;

[0064] Furthermore, the inlet channel of the first-stage optical switch A1 is connected to the laser output end of the first optical time domain reflectometer (OTDR-1) through an optical fiber. The optical signal of the first optical time domain reflectometer is incident from the inlet channel of the optical switch A1 and is emitted from the outlet channel of the optical switch A1. The outlet channels 1, 2, 3, 4, 5, 6, 7, and 8 of A1 are respectively connected to the inlet channels 1 of the optical wavelength division multiplexers C1, C2, C3, C4, C5, C6, C7, and C8. Driven by the processor module, the output signal light of the first optical time domain reflectometer can be arbitrarily switched among the inlet channels 1 of the wavelength division multiplexers C1, C2, C3, C4, C5, C6, C7, and C8.

[0065] Furthermore, the inlet channel of the first-stage optical switch A2 is connected to the laser output end of a second optical time domain reflectometer (OTDR-2) via an optical fiber. The optical signal of the second optical time domain reflectometer enters the inlet channel of the optical switch A2 and exits from the outlet channel of the optical switch A2. The outlet channels 1, 2, 3, 4, 5, 6, 7, and 8 of A1 are respectively connected to the inlet channels of the second-stage optical switches B1, B2, B3, B4, B5, B6, B7, and B8. Driven by the processor module, the output signal light of the second optical time domain reflectometer can be arbitrarily switched at the inlet channels of the second-stage optical switches B1, B2, B3, B4, B5, B6, B7, and B8.

[0066] Specifically, the second-stage optical switches (B1, B2, B3, B4, B5, B6, B7, and B8) are all one-input and eight-output optical switches, and the processor module drives the channel selection;

[0067] Furthermore, the first outlet channels of the second-stage optical switches B1, B2, B3, B4, B5, B6, B7, and B8 are respectively connected to the second inlet channels of the optical wavelength division multiplexers C1, C2, C3, C4, C5, C6, C7, and C8; the second to eighth outlet channels of the second-stage optical switch B1 are respectively connected to the second to eighth inlet channels of the optical fiber connector D1; the second to eighth outlet channels of the second-stage optical switch B2 are respectively connected to the second to eighth inlet channels of the optical fiber connector D2; the second to eighth outlet channels of the second-stage optical switch B3 are respectively connected to the second to eighth inlet channels of the optical fiber connector D3; and the second to eighth outlet channels of the second-stage optical switch B4 are respectively connected to the second to eighth inlet channels of the optical fiber connector D4. to the eighth inlet channel, the second to eighth outlet channels of the second-stage optical switch B5 are respectively connected to the second to eighth inlet channels of the optical fiber connector D5, the second to eighth outlet channels of the second-stage optical switch B6 are respectively connected to the second to eighth inlet channels of the optical fiber connector D6, the second to eighth outlet channels of the second-stage optical switch B7 are respectively connected to the second to eighth inlet channels of the optical fiber connector D7, and the second to eighth outlet channels of the second-stage optical switch B8 are respectively connected to the second to eighth inlet channels of the optical fiber connector D8. Under the action of the processor module, the signal light output by the second optical time domain reflectometer can be arbitrarily switched to all outlet channels of the second-stage optical switches B1, B2, B3, B4, B5, B6, B7, and B8;

[0068] Specifically, the forward direction of the optical wavelength division multiplexer (C1, C2, C3, C4, C5, C6, C7, C8) is a two-input and one-output optical wave combiner, and the reverse direction is a one-input and two-output optical wave splitter.

[0069] Furthermore, in the forward direction: the probe light with a wavelength of λ1 from the first optical time domain reflectometer OTDR-1 and the probe light with a wavelength of λ2 from the second optical time domain reflectometer OTDR-2 pass through the optical wavelength division multiplexers C1, C2, C3, C4, C5, C6, C7, and C8 without affecting each other and enter the first inlet channels of the optical fiber connectors D1, D2, D3, D4, D5, D6, D7, and D8;

[0070] Furthermore, in the reverse direction: the reflected echo signal from the optical fiber link where the first channel D1, D2, D3, D4, D5, D6, D7, and D8 is located is separated from the optical wavelength division multiplexers C1, C2, C3, C4, C5, C6, C7, and C8 into two beams of wavelength λ1 and λ2. The two beams of wavelength λ1 and λ2 return to the first optical time domain reflectometer and the second optical time domain reflectometer respectively.

[0071] Specifically, the optical fiber connectors (D1, D2, D3, D4, D5, D6, D7, D8) are universal standard optical fiber connectors, which are connected to the connectors of the optical cables to be tested via adapter cables.

[0072] The third embodiment of the present invention can be referred to Figures 2 to 5 This embodiment is an application example combining the first and second embodiments.

[0073] This embodiment provides a multi-channel optical link adaptive detection device, including a controller module (CPU), a processor module (FPGA), a data exchange module (IO), a first optical time domain reflectometer (OTDR-1), a second optical time domain reflectometer (OTDR-2), first-stage optical switches (A1, A2), second-stage optical switches (B1, B2, B3, B4, B5, B6, B7, B8), optical wavelength division multiplexers (C1, C2, C3, C4, C5, C6, C7, C8), and optical fiber connector modules (D1, D2, D3, D4, D5, D6, D7, D8). Specific features include:

[0074] The controller module (CPU) is used to perform the following operations: ① real-time data from the first optical time domain reflectometer, ② determine the channel of the currently connected optical fiber connector based on the processing result, ③ send the channel number of the currently connected optical fiber connector to the processor module (FPGA), ④ process the test data of the second optical time domain reflectometer, ⑤ send the test result to the data exchange module (IO), and ⑥ receive instructions and data from the external device through the data exchange module (IO) and process them in real time;

[0075] The processor module (FPGA) is used to perform the following operations: ① collecting and processing test data of a first optical time domain reflectometer (OTDR-1), ② collecting and processing test data of a second optical time domain reflectometer (OTDR-2), ③ reading the status of each optical switch (1×8), and ④ switching the optical channels of each optical switch (A1, A2, B1, B2, B3, B4, B5, B6, B7, B8) according to the instructions of the controller module (CPU);

[0076] The data exchange module (IO) is used to communicate with external devices to realize instruction reception and data exchange between the device and other devices;

[0077] The first optical time domain reflectometer (OTDR-1) is used to dynamically monitor the connection status of the optical links where each group of optical connectors D1, D2, D3, D4, D5, D6, D7, and D8 are located.

[0078] The second optical time domain reflectometer (OTDR-2) tests the assembled optical link according to the monitoring result of the first optical time domain reflectometer (OTDR-1);

[0079] The first-stage optical switch (A1) is driven by the processor module (FPGA) to switch the detection light of the first optical time domain reflectometer (OTDR-1) to enter the input terminals 1 of the optical wavelength division multiplexers C1, C2, C3, C4, C5, C6, C7 and C8 respectively;

[0080] The first-stage optical switch (A2) is driven by the processor module (FPGA) to switch the detection light of the second optical time domain reflectometer (OTDR-2) to enter the second-stage optical switches B1, B2, B3, B4, B5, B6, B7, and B8 respectively.

[0081] The second-stage optical switches B1, B2, B3, B4, B5, B6, B7, and B8, driven by the processor module (FPGA), are used to switch the detection light from the second optical time domain reflectometer (OTDR-2) of the first-stage optical switch (A2) to channel 2 of the optical wavelength division multiplexers C1, C2, C3, C4, C5, C6, C7, and C8 or channels 2 to 8 of the optical connectors D1, D2, D3, D4, D5, D6, D7, and D8;

[0082] The optical wavelength division multiplexers C1, C2, C3, C4, C5, C6, C7, and C8 are used to couple two optical fibers to another optical fiber to achieve forward optical beam combining and reverse optical beam splitting. The output ends of the optical wavelength division multiplexers C1, C2, C3, C4, C5, C6, C7, and C8 are connected to channel 1 of the optical connectors D1, D2, D3, D4, D5, D6, D7, and D8 respectively;

[0083] The optical fiber connector module includes 8 optical fiber connectors D1, D2, D3, D4, D5, D6, D7, and D8, which are standard aerospace connectors. Each connector contains 8 cores and is used to connect to the connector plug of the test optical cable;

[0084] like Figure 3 As shown, in this embodiment, the optical fiber connectors D1, D2, D3, D4, D5, D6, D7, and D8 select the optical connector sockets (holes) of model J599, and the corresponding optical fiber connectors E1, E2, E3, E4, E5, E6, E7, and E8 of the test cable select the optical connector plugs (pins) of model J599;

[0085] like Figure 3 As shown, in this embodiment, the change in the optical link status of the optical cable under test is the plugging and unplugging of optical connectors F1, F2, F3, F4, F5, F6, F7, and F8 of model JYH;

[0086] like Figure 3As shown, the external device (CT) is connected to the data exchange module (IO) via a communication link (LK), and the controller module (CPU) realizes real-time data exchange with the external device;

[0087] like Figure 3 As shown, the first optical time domain reflectometer (OTDR-1) dynamically monitors the connection status of optical connectors F1, F2, F3, F4, F5, F6, F7, and F8. When optical connector F1 is connected, a connection characteristic value appears at the position corresponding to F1 in the first optical time domain reflectometer data. The controller module (CPU) sends "D1" to the processor module (FPGA). The processor module drives the first-stage optical switch A2 to switch the second optical time domain reflectometer detection light to the second-stage optical switch B1. The second optical time domain reflectometer (OTDR-2) sequentially detects the eight optical fiber links where D1 is located. The processor module also drives the first-stage optical switch A1 to switch the first optical time domain reflectometer detection signal to C2, C3, C4, C5, C6, C7, and C8 in a cyclical manner. The controller module receives the data of the second optical time domain reflectometer in real time through the processor module and sends the data to the external device (CT) through the data exchange module (IO). The external device performs manual or automatic interpretation.

[0088] If the external device (CT) determines that all optical links in D1 are in normal state, the optical connector F1 is properly connected. The external device sends a "Y" to the controller module, and the second optical time domain reflectometer continues to wait for the number of the next set of optical cable connectors to be connected.

[0089] If the external device (CT) determines that any optical link in D1 is abnormal, indicating an abnormal connection of optical connector F1, the external device sends an "N" signal to the controller module. The controller module then adds the optical cable connector number to the monitored list. The first optical time domain reflectometer scans the connector number, changing the scan order to C1, C2, C3, C4, C5, C6, C7, and C8. When the optical link to which the connector belongs is reconnected, the controller module sends the connector number to the processor module again, and the second optical time domain reflectometer retests it until the optical link to which the D1 connector belongs returns to normal.

[0090] The fourth embodiment of the present invention is another application example similar to the third embodiment.

[0091] Figure 3The figure shows that F1 has been connected normally and F2 is being connected. A connection characteristic value appears at the position corresponding to F2 in the first optical time domain reflectometer data. The controller module (CPU) will send "D2" to the processor module (FPGA). The processor module drives the first-stage optical switch A2 to switch the second optical time domain reflectometer detection light to the second-stage optical switch B2. The second optical time domain reflectometer (OTDR-2) sequentially detects the eight optical fiber links where D2 is located. The processor module also drives the first-stage optical switch A1 to switch the first optical time domain reflectometer detection signal to C3, C4, C5, C6, C7, and C8 in a cyclical manner. The controller module receives the data from the second optical time domain reflectometer in real time through the processor module and sends the data to the external device (CT) through the data exchange module (IO). The external device performs manual or automatic interpretation.

[0092] If the external device (CT) determines that all optical links in D2 are in normal state, the optical connector F2 is properly connected. The external device sends a "Y" to the controller module, and the second optical time domain reflectometer continues to wait for the number of the next optical cable connector to be connected.

[0093] If the external device (CT) determines that any optical link in D2 is abnormal, the optical connector F2 is abnormally plugged in. The external device sends an "N" to the controller module, which then adds the optical cable connector number to the monitored object. The first optical time domain reflectometer scan list will add the connector number and change the scan order to C2, C3, C4, C5, C6, C7, and C8. When the optical link where the D2 connector is located is plugged in again, the connector number will be sent to the processor module by the controller module again, and the second optical time domain reflectometer will detect it again until the optical link where the D2 connector is located is normal.

[0094] With reference to the third embodiment and the fourth embodiment, the test ends when all optical links are tested and are in normal status.

[0095] The multi-channel optical link adaptive detection and device provided by the present invention can realize the adaptive detection of the connection status of multi-channel optical fiber links. A set of tests can complete the test of 64 channels (but not limited to 64 channels) of optical links.

[0096] The multi-channel optical link adaptive detection and device provided by the present invention is used to detect the on-orbit installation process of multi-channel optical fiber links used by spacecraft payloads. The device can realize multi-channel optical link adaptive detection in an unmanned environment, solving the problem of real-time detection of multi-channel optical fiber links in an unmanned environment.

[0097] It is understandable that, with reference to the third embodiment and the fourth embodiment, similar multi-channel optical link adaptive detection methods can be implemented by changing the connector model.

[0098] It can be understood that, with reference to the third embodiment and the fourth embodiment, a similar multi-channel optical link adaptive detection method can be implemented by increasing the number of connectors.

[0099] It can be understood that, with reference to the third embodiment and the fourth embodiment, similar multi-channel optical link adaptive detection methods can be implemented by changing the device level and protection level of the apparatus.

[0100] It can be understood that, with reference to the third embodiment and the fourth embodiment, similar multi-channel optical link adaptive detection methods can be implemented by changing external devices and their communication links.

[0101] A fourth embodiment of the present invention is an electronic device, such as Figure 6 As shown, it can be understood as a physical device, including a processor and a memory storing instructions executable by the processor. When the instructions are executed by the processor, the following operations are performed:

[0102] Step S1, in response to a start instruction sent by the controller module, using a first optical time domain reflectometer, turning on a first primary optical switch, and monitoring the connection status of optical connectors in multiple channels in a preset order through a wavelength division multiplexer;

[0103] Step S2: When a connection characteristic value indicating successful plugging appears at a corresponding position in the feedback data obtained by the first optical time domain reflectometer, the controller module generates a connection instruction corresponding to the successfully connected optical connector;

[0104] Step S3: In response to the connection instruction sent by the controller module, the second-level optical switch is driven to switch the detection light of the second optical time domain reflectometer to the second-level optical switch corresponding to the connection instruction, and the second optical time domain reflectometer is used to sequentially detect multiple optical fiber links where the successfully connected optical connector is located. At the same time, the first-level optical switch is driven to switch the detection signal of the first optical time domain reflectometer to each wavelength division multiplexer in a different channel from the successfully connected optical connector, and the cycle is repeated.

[0105] Step S4, feeding back the received data of the second optical time domain reflectometer to the controller module, and sending the data to an external device through a data exchange module, wherein the external device is used to complete the determination of the connection status;

[0106] Step S5: In response to the obtained reading result, the connection status of the optical link of each channel is read in sequence.

[0107] The fifth embodiment of the present invention is a method for real-time pseudorange quality control of a Beidou satellite-based augmentation system. The process of this embodiment is the same as that of the first, second, or third embodiments. The difference is that, in terms of engineering implementation, this embodiment can be implemented using software plus a required general-purpose hardware platform. Of course, it can also be implemented through hardware, but in many cases the former is a more preferred implementation method. Based on this understanding, the method of the present invention can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, or optical disk) and includes a number of instructions for enabling a device to execute the method described in the embodiment of the present invention.

[0108] Compared with the prior art, this embodiment has at least the following advantages:

[0109] The present invention provides a multi-channel optical link adaptive detection method, which realizes multi-channel optical link adaptive detection by using dual OTDRs working in collaboration. The two OTDR modules use different laser wavelengths and work in parallel without interfering with each other. The first OTDR module dynamically monitors optical link changes, and the second OTDR module detects the channel according to the output channel number of the first OTDR.

[0110] Based on the embodiments of the present invention, continuous automatic detection of multiple channels can be achieved without the need for personnel to repeatedly plug and unplug connectors. In addition, the method realizes parallel processing of monitoring and testing, and the status of other connectors can continue to be monitored during the test process, thereby solving the problem that the status monitoring and testing of a single OTDR module cannot be carried out in parallel and the problem that testing is difficult in unattended conditions.

[0111] The multi-channel optical link adaptive detection method provided by the present invention can realize the multi-channel optical link state adaptive detection;

[0112] The multi-channel optical link adaptive detection method provided by the present invention is particularly suitable for on-orbit installation process status detection of multi-channel optical links on spacecraft payloads;

[0113] The multi-channel optical link adaptive detection method provided by the present invention is also applicable to other complex optical fiber switching network detection;

[0114] The multi-channel optical link adaptive detection method provided by the present invention is also suitable for monitoring the connection status of optical fiber networks in harsh environments such as high temperature and low temperature.

[0115] The multi-channel optical link adaptive detection and device provided by the present invention is used to detect the on-orbit installation process of multi-channel optical fiber links used in spacecraft payloads. The device can realize multi-channel optical link adaptive detection in an unmanned environment, solving the problem of real-time detection of multi-channel optical fiber links in an unmanned environment.

[0116] Through the description of the specific implementation methods, a deeper and more specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose should be obtained. However, the accompanying drawings are only for reference and illustration purposes and are not intended to limit the present invention.

Claims

1. A multi-channel optical link adaptive detection method, characterized in that: The multi-channel optical link includes at least two channels, each channel includes a secondary optical switch, a wavelength division multiplexer, and an optical connector, and the method includes: Step S1, in response to a start instruction sent by the controller module, using a first optical time domain reflectometer, turning on a first primary optical switch, and monitoring the plugging status of sub-optical connectors in multiple channels in a preset order through a wavelength division multiplexer; Step S2: When a connection characteristic value indicating successful plugging appears at a corresponding position in the feedback data obtained by the first optical time domain reflectometer, the controller module generates a connection instruction corresponding to the successfully connected optical connector; Step S3: In response to the connection instruction sent by the controller module, the second-level optical switch is driven to switch the detection light of the second optical time domain reflectometer to the second-level optical switch corresponding to the connection instruction, and the second optical time domain reflectometer is used to sequentially detect multiple optical fiber links where the successfully connected optical connector is located. At the same time, the first-level optical switch is driven to switch the detection signal of the first optical time domain reflectometer to each wavelength division multiplexer in a different channel from the successfully connected optical connector, and the cycle is repeated. Step S4, feeding back the received data of the second optical time domain reflectometer to the controller module, and sending the data to an external device through a data exchange module, wherein the external device is used to complete the determination of the connection status; Step S5, in response to the obtained reading result, the connection status of the optical link of each channel is read in sequence; The laser power of the first optical time domain reflectometer is P1, where P1 satisfies 1mW≤P1≤20mW, the laser wavelength is λ1, where λ1 satisfies 500nm≤λ1≤1650nm, the detection range is L1, where L1 is one of 100m, 400m, 1000m, and 5000m, and the minimum distance resolution is δ1=50mm; The laser power of the second optical time domain reflectometer is P2, where P2 satisfies 1 mW≤P2≤20 mW, the laser wavelength is λ2, where λ2 satisfies 500 nm≤λ2≤1650 nm and |λ2-λ1|≥10 nm, the detection range is L2, where L2=L1, and the minimum distance resolution is δ2, where δ2=δ1; The data exchange module is an IO interface.

2. The multi-channel optical link adaptive detection method according to claim 1, characterized in that: The first-level optical switch and the second-level optical switch are one-input and eight-output optical switches, and the second-level optical switches are one-input and eight-output optical switches.

3. The multi-channel optical link adaptive detection method according to claim 1, wherein: The forward direction of the wavelength division multiplexer is a two-input one-output optical wave combiner, and the reverse direction is a one-input two-output optical wave splitter. Wherein, when the wavelength division multiplexer is in the forward direction, the detection light with a wavelength of λ1 from the first optical time domain reflectometer and the detection light with a wavelength of λ2 from the second optical time domain reflectometer pass through the wavelength division multiplexer without affecting each other and enter the first inlet channel of the corresponding optical fiber connector; Furthermore, when the wavelength division multiplexer is in the forward direction, the reflected echo signal from the optical fiber link where the first channel of the optical fiber connector is located is separated from the corresponding wavelength division multiplexer into two beams of light with wavelengths λ1 and λ2. The optical signal with wavelength λ1 returns to the first optical time domain reflectometer, and the optical signal with wavelength λ2 returns to the second optical time domain reflectometer.

4. The multi-channel optical link adaptive detection method according to claim 1, characterized in that: The first outlet channels of the secondary optical switch are respectively connected to the second inlet channels of the wavelength division multiplexer, and the second to eighth outlet channels of the secondary optical switch are respectively connected to the second to eighth inlet channels of the optical fiber connector. The signal light output by the second optical time domain reflectometer can be switched across all outlet channels of the different secondary optical switches.

5. A multi-channel optical link adaptive detection device, characterized in that: include: A controller module, a processor module, a data exchange module, a first optical time domain reflectometer, a second optical time domain reflectometer, a first primary optical switch, a second primary optical switch, a secondary optical switch, a wavelength division multiplexer, and an optical connector. In response to a control instruction of the controller module, the processor module is configured to use the first optical time domain reflectometer and the second optical time domain reflectometer to implement the multi-channel optical link adaptive detection method according to any one of claims 1 to 4.

6. An electronic device, characterized in that: The electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the steps of the multi-channel optical link adaptive detection method according to any one of claims 1 to 4 are implemented.

7. A computer storage medium, characterized in that The computer storage medium stores a computer program, which, when executed by a processor, implements the steps of the multi-channel optical link adaptive detection method according to any one of claims 1 to 4.

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