Method and apparatus for identifying optical fiber connection information

Abstract

The present application relates to the technical field of optical communications, and provides a method and apparatus for identifying optical fiber connection information. The method comprises: sending a plurality of pulse signals to a first optical fiber link, wherein the plurality of pulse signals comprise pulse signals of a plurality of wavelengths or pulse signals of a plurality of pulse widths at a first wavelength, and the plurality of pulse signals are sent one by one; acquiring Rayleigh scattering information of the first optical fiber link on the basis of the plurality of pulse signals to obtain first encoded information of the first optical fiber link; and identifying connection information of the first optical fiber link on the basis of a matching relationship of the first encoded information in an encoded information set, wherein the encoded information set comprises encoded information of a plurality of known optical fiber segments and / or encoded information obtained from the previous detection of the first optical fiber link. By means of the solution of the present application, the efficiency of identifying optical fiber connection information can be improved.

Description

Method and device for identifying optical fiber connection information

[0001] The present application claims priority to Chinese Patent Application No. 202411047832.9, filed on July 31, 2024, entitled "Method and device for identifying optical fiber connection information", and Chinese Patent Application No. 202510974512.6, filed on July 14, 2025, entitled "Method and device for identifying optical fiber connection information", the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the field of optical communication technology, in particular to a method and device for identifying optical fiber connection information. BACKGROUND

[0003] With the rapid growth of data traffic, the requirement for communication rate between devices is also increasing. Optical fiber has gradually become the main medium for communication between devices due to its advantages of large bandwidth, low loss and low cost. For example, long-distance transmission of backbone network, interconnection of core machine room of metropolitan area network, broadband access based on optical distribution network (ODN) of access network, and even front transmission of wireless base station and interconnection between data center switches. Optical fiber has occupied an absolute dominant position. From the optical transmission core machine room to the metropolitan area convergence machine room, to the convergence optical cable junction box, and finally to the first optical splitter of the cell optical cable junction box, the optical path passes through multiple indoor and outdoor optical distribution frames (ODF) for jumper connection. The information of all these optical fiber jumper connections needs to be recorded and maintained manually. Manual management is time-consuming and laborious, prone to errors and difficult to check, which brings inconvenience to the operation and maintenance management of optical fiber network by operators.

[0004] Currently, in order to identify the optical fiber connection relationship, an accessory with an identification code is attached to the optical fiber head, and the connection relationship between the optical fibers is identified by photographing and combining image recognition. Since photographing is required, remote identification is not possible, and the identification efficiency is low. SUMMARY

[0005] The present application provides a method and device for identifying optical fiber connection information, which can improve the identification efficiency of optical fiber connection information. The technical solutions adopted are as follows:

[0006] In a first aspect, the present application provides a method for identifying fiber connection information, the method comprising: sending a plurality of pulse signals to a first fiber link, the plurality of pulse signals comprising pulse signals of a plurality of wavelengths or pulse signals of a first wavelength and a plurality of pulse widths, the plurality of pulse signals being sent one by one, obtaining Rayleigh scattering information of the first fiber link based on the plurality of pulse signals to obtain first encoding information of the first fiber link, identifying connection information of the first fiber link based on a matching relationship of the first encoding information in an encoding information set, the encoding information set comprising encoding information of a plurality of known fiber sections and / or encoding information obtained by last detection of the first fiber link.

[0007] In the scheme shown in the present application, one pulse signal is sent to the fiber link from the remote end each time, and the pulse signal is sent continuously multiple times to obtain a plurality of Rayleigh scattering information corresponding to the plurality of pulse signals, the plurality of Rayleigh scattering information forming the encoding information of the fiber link, and the encoding information is matched with the encoding information of the known fiber section to automatically identify the fiber in the fiber link, thereby identifying the connection information of the fiber link. In this way, not only can the fiber be automatically identified from the remote end to improve the identification efficiency, but also since the plurality of Rayleigh scattering information forms the encoding information of the fiber link, the information amount of a single fiber is relatively large, and the shortest length of the identifiable fiber can also be reduced. The method for identifying fiber connection information is applied to a short fiber identification scene.

[0008] In an optional manner, for a second wavelength in the plurality of wavelengths, the pulse signal of the second wavelength is a pulse signal of a scanning frequency, and the frequency of the pulse signal of the second wavelength overlaps with the frequency of the pulse signal of an adjacent wavelength in the plurality of wavelengths; and the Rayleigh scattering information of the first fiber link is obtained by means of coherent detection.

[0009] In the scheme shown in the present application, the second wavelength is any wavelength in the plurality of wavelengths, and the pulse signal of the second wavelength is a pulse signal of a scanning frequency, that is, the frequency of the pulse signal changes. In this way, since the Rayleigh scattering curve of different frequency components is obtained under single measurement, a larger temperature change can be covered, so that the number of times of sending the pulse signal can be reduced, and the efficiency of establishing the encoding information set and the efficiency of identifying the connection information can be improved.

[0010] In an optional manner, the Rayleigh scattering information of the first fiber link is obtained by means of coherent detection. In this way, the high contrast of the Rayleigh scattering curve can be preserved to support the identification of the fiber under a lower signal-to-noise ratio.

[0011] In an optional mode, the first optical fiber link includes a plurality of optical fiber segments connected in series, and the first encoding information includes encoding information of each optical fiber segment in the plurality of optical fiber segments; and the matching relationship of the first encoding information in the encoding information set is used to identify the connection information of the first optical fiber link, including: for each optical fiber segment, determining second encoding information matching the encoding information of the optical fiber segment in the encoding information set, and determining the optical fiber segment as a known optical fiber segment to which the second encoding information belongs; and sorting the determined known optical fiber segments according to the order of the plurality of optical fiber segments in the first optical fiber link to obtain the optical fiber connection relationship in the first optical fiber link.

[0012] In the scheme shown in the present application, the first optical fiber link includes a plurality of optical fiber segments, and the encoding information of each optical fiber segment can be used to identify the corresponding known optical fiber segment of the plurality of optical fiber segments. In this way, not only can the optical fiber connection relationship of the optical fiber link be automatically identified to improve the identification efficiency, but also the use of multiple Rayleigh scattering information encodings for each optical fiber segment can improve the identification accuracy.

[0013] In an optional mode, each known optical fiber segment is connected with a fusion fiber tray port of a fiber cable junction box or a fiber distribution frame; and the method further includes: generating a connection relationship of the fusion fiber tray ports in the fiber cable junction box or the fiber distribution frame based on the optical fiber connection relationship.

[0014] In the scheme shown in the present application, when the optical fiber segment is a fusion fiber tray port connected optical fiber segment, the optical fiber connection relationship can be used to identify the connection relationship of the fusion fiber tray ports in the fiber cable junction box or the fiber distribution frame, thereby improving the identification efficiency.

[0015] In an optional mode, the matching relationship of the first encoding information in the encoding information set is used to identify the connection information of the first optical fiber link, including: if the first encoding information matches the encoding information obtained by detecting the first optical fiber link last time, it is determined that the optical fiber connection relationship of the first optical fiber link has not changed; and if the first encoding information does not match the encoding information obtained by detecting the first optical fiber link last time, it is determined that the optical fiber connection relationship of the first optical fiber link has changed.

[0016] In the scheme shown in the present application, the encoding information of the first optical fiber link obtained at adjacent times is acquired, and it is determined whether the encoding information of the first optical fiber link obtained at adjacent times matches, so that it can be automatically determined whether the connection relationship of the optical fiber segment of the first optical fiber link has changed, thereby improving the identification efficiency.

[0017] In an optional mode, each known fiber section is a tail fiber of an optical communication device; and the matching relationship of the first encoding information in the encoding information set is used to identify the connection information of the first fiber link, including: determining third encoding information matching the first encoding information in the encoding information set; if the third encoding information corresponds to the to-be-tested optical communication device, it is determined that the first fiber link is connected to the to-be-tested optical communication device; and if the third encoding information does not correspond to the to-be-tested optical communication device, it is determined that the first fiber link is not connected to the to-be-tested optical communication device.

[0018] In the scheme shown in the application, the optical communication device is connected with a tail fiber, a binding relationship of encoding information between the optical communication device and the tail fiber is established, one pulse signal is sent from a remote end to the fiber link each time, and multiple pulse signals are sent continuously to obtain the encoding information of the tail fiber in the fiber link, and the optical communication device connected in the fiber link is determined by comparing the encoding information with the encoding information of the tail fiber connected to the optical communication device, so that the optical communication device connected to the fiber link can be automatically identified from the remote end, and the identification efficiency is improved.

[0019] In an optional mode, each known fiber section is a tail fiber of a port of an optical communication device; and the matching relationship of the first encoding information in the encoding information set is used to identify the connection information of the first fiber link, including: determining fourth encoding information matching the first encoding information in the encoding information set; if the fourth encoding information corresponds to the to-be-tested port, it is determined that the first fiber link is connected to the to-be-tested port; and if the fourth encoding information does not correspond to the to-be-tested port, it is determined that the first fiber link is not connected to the to-be-tested port.

[0020] In the scheme shown in the application, the port of the optical communication device is connected with a tail fiber, a binding relationship of encoding information between the port and the tail fiber is established, one pulse signal is sent from a remote end to the fiber link each time, and multiple pulse signals are sent continuously to obtain the encoding information of the tail fiber in the fiber link, and the port connected in the fiber link is determined by comparing the encoding information with the encoding information of the tail fiber connected to the port, so that the port connected to the fiber link can be automatically identified from the remote end, and the identification efficiency is improved.

[0021] In an optional mode, the Rayleigh scattering information of the first fiber link is obtained based on the multiple pulse signals to obtain the first encoding information of the first fiber link, including: obtaining multiple Rayleigh scattering curves of the first fiber link based on the multiple pulse signals, and combining the multiple Rayleigh scattering curves to obtain the first encoding information of the first fiber link.

[0022] In the scheme shown in the present application, the Rayleigh scattering information under each pulse signal is a Rayleigh scattering curve, and the Rayleigh scattering curves under multiple pulse signals are combined to obtain the encoding information. In this way, the content of the encoding information is rich, and the identification accuracy is high.

[0023] In an optional mode, the method is applied to a temperature change identification scenario; the multiple pulse signals include N wavelength pulse signals, the wavelength interval of adjacent wavelengths in the N wavelengths is the same, and N is greater than 1; the first encoding information includes N-M sub-encoding information, each sub-encoding information includes Rayleigh scattering information corresponding to pulse signals of M+1 adjacent wavelengths, the minimum wavelength corresponding to the ith sub-encoding information is adjacent to the minimum wavelength corresponding to the i+1th sub-encoding information, i is greater than or equal to 1 and less than or equal to N-M; and the matching relationship of the first encoding information in the encoding information set is used to identify the connection information of the first fiber link, including: if at least one sub-encoding information in the N-M sub-encoding information matches the encoding information in the encoding information set, the connection information of the first fiber link is identified based on the matched encoding information.

[0024] In the scheme shown in the present application, in the temperature change scenario, the Rayleigh scattering information of the pulse signal of the first wavelength at the first temperature is the same as or similar to the Rayleigh scattering information of the pulse signal of the second wavelength at the second temperature. In this way, even if the temperature changes, the Rayleigh scattering information of the pulse signal of certain wavelength can match the Rayleigh scattering information of the pulse signal of another wavelength measured at the original temperature, so that the connection information of the fiber link can be identified in the temperature change scenario.

[0025] In a second aspect, the present application provides a device for identifying fiber connection information, which includes one or more modules for implementing the method shown in the first aspect or any optional mode of the first aspect. The device for identifying fiber connection information in the present application can be integrated on an optical communication device, such as a wavelength division multiplexing device, a passive optical network device or an optical transport network device. BRIEF DESCRIPTION OF DRAWINGS

[0026] FIG. 1 is a structural schematic diagram of an identification device according to an example embodiment of the present application;

[0027] FIG. 2 is a flowchart of a method for identifying fiber connection information according to an example embodiment of the present application;

[0028] FIG. 3 is a schematic diagram of a scenario in which the identification device identifies the port connection relationship according to an example embodiment of the present application;

[0029] FIG. 4 is a system diagram of a system for identifying the encoding information of the tail fiber of a fusion splicing tray according to an example embodiment of the present application;

[0030] Fig. 5 is a flow chart of a method for identifying port connection relationship according to an example embodiment of the present application;

[0031] Fig. 6 is a diagram for identifying fiber segment connection relationship according to an example embodiment of the present application;

[0032] Fig. 7 is a flow chart of a method for identifying fiber connection relationship change of a fiber link according to an example embodiment of the present application;

[0033] Fig. 8 is a system diagram of a device according to an example embodiment of the present application;

[0034] Fig. 9 is a flow chart of a method for identifying fiber link connection device according to an example embodiment of the present application;

[0035] Fig. 10 is a system diagram of a port according to an example embodiment of the present application;

[0036] Fig. 11 is a flow chart of a method for identifying fiber link connection port according to an example embodiment of the present application;

[0037] Fig. 12 is a diagram of wavelength versus time of a non-swept pulse signal according to an example embodiment of the present application;

[0038] Fig. 13 is a diagram of wavelength versus time of a swept pulse signal according to an example embodiment of the present application;

[0039] Fig. 14 is another diagram of a structure of an identification device according to an example embodiment of the present application;

[0040] Fig. 15 is yet another diagram of a structure of an identification device according to an example embodiment of the present application;

[0041] Fig. 16 is a block diagram of a method for identifying port connection relationship according to an example embodiment of the present application. DETAILED DESCRIPTION

[0042] For the purpose of making the object, technical scheme and advantages of the present application more clear, the embodiments of the present application will be described in detail below with reference to the drawings.

[0043] In an optical communication network, optical fibers and passive devices cannot conduct electricity, and the information of optical fiber jumper relationship needs to be recorded and maintained manually. Manual management is time-consuming, laborious, error-prone and difficult to check, which brings great pain to the operation and management of optical communication network for operators. In order to identify the optical fiber connection relationship, an accessory with an identification code is attached to the optical fiber head, and the connection relationship between optical fibers is identified by photographing combined with image recognition mode. However, the identification cannot be remotely identified, and the identification efficiency is low. In another way, the unique characteristics of Rayleigh backscattering curve of optical fiber are used, and the Rayleigh scattering curve of optical fiber is measured by an optical time domain reflectometer (OTDR) device which can detect Rayleigh scattering curve, and is used as a feature of optical fiber, so as to identify the optical fiber. Since the spatial resolution of OTDR is low, when the optical fiber to be identified is short, the Rayleigh scattering curve of the optical fiber segment contains few feature points, therefore, the Rayleigh backscattering curves of different optical fibers at the same wavelength may have high similarity, which may easily cause misjudgment, and does not meet the requirements of optical fiber tail fiber identification in the fusion fiber tray and other short optical fiber identification scenarios.

[0044] In the embodiments of the present application, a scheme for multi-dimensional coding of optical fibers is provided, the amount of information of Rayleigh scattering information of a single optical fiber is increased, the shortest length of identifiable optical fiber is reduced, and therefore the remote identification of the port connection relationship of the optical cable junction box and the ODF is realized.

[0045] In the embodiments of the present application, the optical fiber connection information is identified by using an identification device, which can identify the connection relationship of the optical fiber segments in the optical fiber link (i.e., the optical fiber connection relationship) or the devices or ports connected by the optical fiber link. FIG. 1 provides a structural schematic diagram of the identification device, which includes an adjustable optical pulse generator 101, a coupler 102, and a receiving module 103 (the receiving module 103 can be a photodetector). The adjustable optical pulse generator 101 is connected to the coupler 102, and the coupler 102 is connected to the receiving module 103. The adjustable optical pulse generator 101 can emit multiple pulse signals, which include pulse signals of multiple wavelengths or pulse signals of a single wavelength and multiple pulse widths. The pulse signals of multiple wavelengths include pulse signals of multiple wavelengths and the same pulse width, or pulse signals of multiple wavelengths and different pulse widths. The adjustable optical pulse generator 101 outputs the multiple pulse signals to the coupler 102, and the coupler 102 outputs the received multiple pulse signals to the connected optical fiber link. The coupler 102 also sends the pulse signals received by the identification device to the receiving module 103. The receiving module 103 performs photoelectric conversion on the received pulse signals and performs some processing to obtain the encoding information of the optical fiber link, and then uses the encoding information of the optical fiber link to identify the optical fiber connection information. Alternatively, the receiving module 103 performs photoelectric conversion on the received pulse signals to obtain an electrical signal, and performs some necessary processing (such as transimpedance amplification processing) on the electrical signal, and sends the processed electrical signal to another device connected to the identification device. Based on the electrical signal, the other device obtains the encoding information of the optical fiber link, and then uses the encoding information of the optical fiber link to identify the optical fiber connection information. Alternatively, the identification device further includes an identification module 104 connected to the receiving module 103. The receiving module 103 performs photoelectric conversion on the received pulse signals to obtain an electrical signal, and performs some necessary processing on the electrical signal, and sends the processed electrical signal to the identification module 104. Based on the electrical signal, the identification module 104 obtains the encoding information of the optical fiber link, and then uses the encoding information of the optical fiber link to identify the optical fiber connection information.

[0046] Alternatively, the identification device can be an adjustable OTDR. Here, "adjustable" means that the OTDR can emit multiple pulse signals. For example, the adjustable OTDR can output pulse signals of multiple wavelengths, which can be single pulse signals.

[0047] Alternatively, the adjustable OTDR can also be a pulse-coded OTDR, i.e., the adjustable optical pulse generator 101 includes a laser and a pulse modulator. The pulse modulator outputs different encoding information to the laser, so that the laser outputs multiple pulse signals. The encoding information can be in any form, and the embodiments of the present application do not limit the form of the encoding information.

[0048] The principle of the identification device for identifying the fiber connection information in different application scenarios is the same, but there are some differences in the implementation details. First, the method flow for identifying the fiber connection information is outlined, and in the flow, the execution subject is taken as the identification device for example, and reference is made to steps 201 to 203 in FIG. 2 to take the measurement of the first fiber link as an example for description.

[0049] In step 201, multiple pulse signals are sent to the first fiber link. The multiple pulse signals include pulse signals of multiple wavelengths, or pulse signals of multiple pulse widths of a first wavelength, and the multiple pulse signals are sent one by one.

[0050] The pulse widths of the pulse signals of the multiple wavelengths can be the same or different, and the first fiber link is an arbitrary fiber link to be measured. The first wavelength can be one wavelength or multiple wavelengths.

[0051] In this embodiment, at the beginning of the test, the coupler 102 in the identification device is connected with the first fiber link, which can be directly connected or connected through a wavelength division multiplexer (WDM). The WDM is an N*1 WDM, there are N ports on the first side, N is greater than 1, there is one port on the second side, one port on the first side is connected with the identification device, the remaining ports are connected with the optical communication equipment, and the port on the second side is connected with the first fiber link. When the WDM is used, the communication wavelength of the optical communication equipment is different from the wavelengths of the multiple pulse signals. The adjustable optical pulse generator 101 sends the multiple pulse signals to the first fiber link, and the multiple pulse signals are sent one by one. The sending interval of the adjacent two pulse signals is such that the identification device will not confuse the returned pulse signals. The sending order of the multiple pulse signals can be set arbitrarily, for example, the sending order is the order of the wavelengths from small to large.

[0052] In step 202, the Rayleigh scattering information of the first fiber link is obtained based on the multiple pulse signals to obtain the first encoding information of the first fiber link.

[0053] In this embodiment, when the first fiber link transmits the received pulse signals, the Rayleigh scattering phenomenon occurs. The identification device receives the returned pulse signals of the first fiber link, converts the pulse signals into electrical signals, and uses the electrical signals to generate the Rayleigh scattering information corresponding to each pulse signal. In this way, for the first fiber link, multiple Rayleigh scattering information can be obtained. The identification device determines the multiple Rayleigh scattering information as the encoding information of the first fiber link, or the identification device combines the multiple Rayleigh scattering information together to obtain the encoding information of the first fiber link. For the convenience of description, the encoding information of the first fiber link is referred to as the first encoding information.

[0054] In an alternative mode, the Rayleigh scattering information is a Rayleigh scattering curve, and a plurality of Rayleigh scattering curves are combined to obtain the first encoding information. For example, the plurality of pulse signals include pulse signals of three wavelengths, and the first encoding information includes the relationship among the wavelength, distance, and Rayleigh scattering intensity, which is equivalent to three Rayleigh scattering curves in a three-dimensional coordinate system. It can be understood that there are three wavelengths of Rayleigh scattering intensities at a distance position, so the amount of information of the first encoding information is relatively large.

[0055] In step 203, the connection information of the first fiber link is identified based on the matching relationship of the first encoding information in the encoding information set. The encoding information set includes the encoding information of a plurality of known fiber sections and / or the encoding information obtained by the last detection of the first fiber link.

[0056] In the identification of the connection relationship of the fiber in the first fiber link, the encoding information set includes the encoding information of a plurality of known fiber sections. In the identification of whether the connection relationship of the fiber in the first fiber link changes, the encoding information set includes the target encoding information, which is the encoding information obtained by the last detection of the first fiber link. The encoding information set can also include both types of information. First, the target encoding information is used to determine whether the connection relationship of the fiber changes, and then the encoding information of a plurality of known fiber sections is used to determine the specific fiber section that changes.

[0057] In the present embodiment, if the connection relationship of the fiber is identified, or the device or port connected by the first fiber link is identified, the identification device performs similarity matching between the encoding information of a plurality of known fiber sections and the first encoding information to obtain a similarity. The similarity is used to identify the connection relationship of the fiber in the first fiber link, or the device or port connected by the first fiber link. If the change of the connection relationship of the fiber in the first fiber link is identified, the similarity between the first encoding information and the target encoding information is determined. If the similarity exceeds a first threshold, it is determined that the connection relationship of the fiber in the first fiber link does not change, otherwise it is determined that the connection relationship of the fiber in the first fiber link changes. The first threshold can be set according to actual needs.

[0058] In step 203, the identification device can obtain the set of encoding information from other devices, or determine the set of encoding information by itself. As shown in FIG. 3, when the identification device determines the set of encoding information by itself, for each known fiber segment, the coupler 102 in the identification device is connected to the known fiber segment, the adjustable optical pulse generator 101 sends multiple pulse signals to the known fiber segment, the multiple pulse signals are sent one by one, the identification module 104 uses each pulse signal to obtain Rayleigh scattering information of the known fiber segment, i.e., obtains multiple pieces of Rayleigh scattering information, determines the multiple pieces of Rayleigh scattering information as the encoding information of the known fiber segment, or combines the multiple pieces of Rayleigh scattering information together to obtain the encoding information of the known fiber segment. For example, the Rayleigh scattering information is a Rayleigh scattering curve, and the multiple Rayleigh scattering curves corresponding to the multiple pulse signals are combined together to obtain the encoding information of the known fiber segment.

[0059] The method of identifying fiber connection information is described below for various application scenarios.

[0060] Application scenario one: identifying the connection relationship between ports when passing through a jumper device between optical communication devices, the jumper device including an ODF or a cable distribution box. The ODF is generally located in a machine room, and the cable distribution box is generally located outdoors.

[0061] Referring to FIG. 4, there are a machine room A and a machine room B, the machine room A includes an ODF1 and an optical communication device A, the ODF1 is connected to the optical communication device A (the optical communication device A is not shown in the figure, and the optical communication device A can be one or more), the machine room B includes an ODF2 and an optical communication device B, the ODF2 is connected to the optical communication device B, and the optical communication device B can be one or more, and one or more cable distribution boxes are arranged between the ODF1 and the ODF2, and each cable distribution box is a cable distribution box of one level when multiple cable distribution boxes are arranged. The ODFs are connected through optical fibers, and the cable distribution boxes are connected through optical fibers. Each ODF includes multiple rows of fusion splicing trays, each fusion splicing tray includes multiple ports, each cable distribution box includes multiple rows of fusion splicing trays, each fusion splicing tray includes multiple ports, and each port is connected to a segment of a tail fiber. The identification device identifies the port connection relationship between the fusion splicing trays in the ODF and the port connection relationship between the fusion splicing trays in the cable distribution box, and the connection relationship of the ports is the connection relationship between the black circles. In the schematic diagram of FIG. 4, the known fiber segment is the tail fiber connected to each port of the fusion splicing tray.

[0062] FIG. 5 provides a schematic diagram of the identification process, and steps 501 to 506 in FIG. 5 are described below.

[0063] Step 501, the adjustable optical pulse generator 101 is connected with the tail fiber of each port of the ODF or the fiber fusion tray in the cable terminal box one by one, the identification device sends a plurality of pulse signals to each connected tail fiber, the plurality of pulse signals are sent one by one, the Rayleigh scattering information of the tail fiber of the port to each pulse signal is obtained, and the coding information of the port is obtained based on the Rayleigh scattering information of each pulse signal.

[0064] In the embodiment, when the tail fiber of a port is measured, the coupler 101 in the identification device is connected with the tail fiber of the port, and the coding information of the tail fiber of the port is obtained according to the flow of FIG. 3, so that the coding information of the port is obtained.

[0065] Optionally, when the identification device is connected with the tail fiber of each port in the fiber fusion tray, the identification device can be inserted into the port or fused with the tail fiber.

[0066] Step 502, for the tail fiber of each port of the fiber fusion tray, the identification module 104 stores the coding information of the tail fiber of the port and the port information, and the port information includes the number of the port, the number of the fiber fusion tray to which the port belongs, and the number of the ODF or the cable terminal box to which the port belongs.

[0067] The information can be stored in the identification device or a database or a storage device (such as a server) connected with the identification device, and the information constitutes a coding information set. In this way, since the coding information corresponding to each port of each fiber fusion tray is different, each port of each fiber fusion tray is equivalent to being coded.

[0068] Optionally, the port information further includes geographical position information of the cable terminal box.

[0069] Step 503, after the optical fiber link is connected in FIG. 4, the coupler 102 in the identification device is connected with the first optical fiber link to be measured, and the adjustable optical pulse generator 101 sends a plurality of pulse signals to the first optical fiber link, and the plurality of pulse signals are sent one by one.

[0070] In the embodiment, the coupler 102 in the identification device is connected with the first optical fiber link, and the adjustable optical pulse generator 101 sends one pulse signal to the first optical fiber link each time, and the identification module 104 obtains the Rayleigh scattering information of the first optical fiber link under the pulse signal. In this way, after a plurality of different pulse signals are sent to the first optical fiber link, the Rayleigh scattering information of the first optical fiber link under each pulse signal is obtained.

[0071] Step 504, the identification module 104 identifies the coding information of each optical fiber segment in the first optical fiber link.

[0072] In the embodiment, the reflection at the port connection is relatively strong, and a relatively high reflection peak exists in the Rayleigh scattering curve, which is obviously distinguished from other reflection peaks. Therefore, the ODF and the cable junction box can be identified based on the reflection peak at the port, and the coding information of the tail fiber of the fusion splicing tray can be identified in the entire coding information of the first optical fiber link, and the coding information of each optical fiber segment in the first optical fiber link can be obtained.

[0073] In step 505, for each optical fiber segment in the first optical fiber link, the identification module 104 searches the coding information set to find the coding information matching the coding information of the optical fiber segment, and determines the port information corresponding to the found coding information as the port information corresponding to the optical fiber segment.

[0074] In the embodiment, for the first optical fiber segment in the first optical fiber link, the first optical fiber segment is an arbitrary optical fiber segment, the similarity of the coding information of each optical fiber segment to the coding information of the first optical fiber segment is determined in the coding information set, a plurality of similarities are obtained, the similarity exceeding a first threshold value and the maximum similarity are determined, the second coding information to which the maximum similarity belongs is determined, the port information corresponding to the second coding information is obtained, and the port information is determined as the port information of the connected port of the first optical fiber segment.

[0075] Optionally, when the similarity of the coding information of two optical fiber segments is determined, a plurality of position points are sampled in the optical fiber segment, the distance of the Rayleigh scattering intensity obtained by the same position point and the same pulse signal is determined in the plurality of position points, all the distances are summed, and then the reciprocal is calculated to obtain the similarity. Here, it is only one possible calculation method, and the application embodiment does not limit the calculation method of the similarity. For example, the cross-correlation result of the coding information of the two optical fiber segments can also be used to represent the similarity of the two optical fiber segments.

[0076] It should be noted that when the optical pulse signal is input from both ends of the tail fiber of the fusion splicing tray, the obtained coding information is not the same. In order to make the transmission direction of the pulse signal the same when the coding information of the tail fiber is measured and when the optical fiber link is measured, the transmission direction of the pulse signal is set to the transmission direction of the pulse signal when the tail fiber is located in the optical fiber link when the coding information of the tail fiber is measured. Alternatively, the pulse signal is input from the port or from the non-port end of the tail fiber when the coding information of the tail fiber is generated. Before matching, the Rayleigh scattering information of the optical fiber segment with opposite pulse transmission directions in the first optical fiber link is converted to obtain the Rayleigh scattering information with the same pulse signal transmission direction, and then the matching is performed. For example, for the first optical fiber segment in the first optical fiber link, the pulse signal of the first optical fiber segment is input from the port, and when the tail fiber is measured, the pulse signal is input from the non-port end. Therefore, the coding information of the first optical fiber segment is converted to the coding information input from the non-port end.

[0077] Step 506, the identification module 104 outputs the port connection relationship between each ODF or the fusion splicer in the cable distribution box.

[0078] In this embodiment, the port information is sorted according to the order of the plurality of fiber segments in the first fiber link, and the port connection relationship between the fusion splicers is obtained.

[0079] In the scenario shown in Figure 5, the known fiber segment is the tail fiber, and in some cases, the tail fiber is also fused with other fiber segments, so the known fiber segment includes the tail fiber and the fiber segment fused with the tail fiber.

[0080] In application scenario one, the port connection relationship is identified, and in some scenarios, only the connection relationship of the fibers of the first fiber link can be identified. Referring to Figure 6, the identification device sends a plurality of pulse signals to the first fiber link, and the plurality of pulse signals are sent one by one to obtain the coding information CC' and DD' of each fiber segment, etc. CC' and DD' belong to fiber segment C' and fiber segment D' respectively, and the coding information CC' is matched and searched in the coding information set. If it is determined that CC' matches the coding information of fiber segment C, it is determined that fiber segment C' is fiber segment C, and this method is used to output all fiber segments as fiber C, fiber D, etc. The final output fiber connection relationship is: fiber segment C-fiber segment D-fiber segment…

[0081] Using the flow shown in Figure 5, at the far end, the wavelength and distance two-dimensional coding scheme (i.e. there are multiple wavelength Rayleigh scattering intensities at one distance position), or the pulse width and distance two-dimensional coding scheme (i.e. there are multiple pulse width Rayleigh scattering intensities at one distance position), or the wavelength, pulse width and distance three-dimensional coding scheme (i.e. there are multiple pulse width and multiple wavelength Rayleigh scattering intensities at one distance position) is used to improve the accuracy of identifying short distance fibers, and the connection relationship of the fibers in the fiber link can be obtained from the far end to improve the identification accuracy and efficiency.

[0082] Application scenario two, identify whether the port connection relationship of the cable distribution box or the ODF has changed, and the connection mode of the cable distribution box or the ODF is described in Figure 4.

[0083] Figure 7 provides a flowchart for identifying changes in fiber connection relationship, and steps 701 to 706 are described as an example of identifying whether the connection relationship of the first fiber link has changed.

[0084] Step 701, the adjustable optical pulse generator 101 sends a plurality of pulse signals to the first fiber link, and the plurality of pulse signals are sent one by one.

[0085] The processing process of step 701 is described in step 503, which will not be described here.

[0086] At step 702, the identification module 104 acquires the coding information of each optical fiber segment in the first optical fiber link, and stores the coding information of each optical fiber segment in the local or in the storage device in correspondence with the identification of the first optical fiber link.

[0087] In this embodiment, the identification module 104 combines the Rayleigh scattering information of the first optical fiber link under the multiple pulse signals, and obtains the target coding information of the first optical fiber link. The reflection at the port connection is relatively strong, and there is a relatively high reflection peak in the Rayleigh scattering curve, which is obviously distinguished from other reflection peaks. Therefore, based on the reflection peak at the port, the positions of the ODF and the cable distribution box can be identified, so that the coding information of the multiple optical fiber segments can be identified in the target coding information, and then the coding information of the multiple optical fiber segments is stored in the local or in the storage device in correspondence with the identification of the first optical fiber link.

[0088] At step 703, when determining whether the connection relationship of the first optical fiber link changes, the adjustable optical pulse generator 101 sends multiple pulse signals to the first optical fiber link, the multiple pulse signals are sent one by one, and the identification module 104 obtains the first coding information of the first optical fiber link, and identifies the coding information of the multiple optical fiber segments in the first coding information.

[0089] In this embodiment, the identification device stores a measurement period, and when the measurement period is reached, it is determined to determine whether the connection relationship of the first optical fiber link changes, or the identification device receives a measurement instruction, and it is determined to determine whether the connection relationship of the first optical fiber link changes.

[0090] The process of determining the coding information of the multiple optical fiber segments in step 703 is the same as the processes of steps 701 to 702, and will not be described here.

[0091] At step 704, the identification module 104 determines whether the coding information of the optical fiber segment obtained by the two measurements matches.

[0092] In this embodiment, for each optical fiber segment, the similarity of the coding information obtained by the two measurements is determined, and the size relationship between the similarity and the first threshold value is determined. If the similarity exceeds the first threshold value, it is determined to match, otherwise it is determined not to match.

[0093] At step 705, if the match is matched, the identification module 104 outputs that the optical fiber connection relationship of the first optical fiber link has not changed, and if the match is not matched, the identification module 104 outputs that the optical fiber connection relationship of the first optical fiber link has changed.

[0094] Optionally, when the connection relationship of the first optical fiber link changes, the position of the changed optical fiber segment can also be output, and the position is represented by the distance between the identification device and the optical fiber segment.

[0095] If the match fails, the identification module 104 updates the stored encoding information of the plurality of fiber sections of the first fiber link to the changed encoding information of the plurality of fiber sections.

[0096] The flow shown in FIG. 7 is used to improve the accuracy of identifying short-distance optical fibers at the remote end by using a wavelength and distance two-dimensional coding scheme, or a pulse width and distance two-dimensional coding scheme, or a wavelength, pulse width, and distance three-dimensional coding scheme, so that the connection relationship of the fiber link can be accurately identified based on the Rayleigh scattering encoding information measured twice.

[0097] In the third application scenario, the remote end of an optical communication device with a pigtail is identified. The optical communication device has one pigtail, and can be an optical modem or the like. Referring to FIG. 8, the identification device can be connected to one optical communication device to be identified each time, and each optical communication device to be identified has one pigtail. The encoding information of the pigtail is used to identify the optical communication device to which the pigtail is connected.

[0098] FIG. 9 provides a flowchart for identifying an optical communication device. Referring to steps 901 to 904, the first optical communication device connected by the fiber link is taken as an example for illustration. The fiber section is the pigtail connected to the optical communication device. In addition, in the case where the pigtail has been fused with the fiber section, the fiber section includes the pigtail and the fiber section fused with the pigtail.

[0099] In step 901, the identification device obtains the encoding information of the pigtail of each optical communication device.

[0100] In this embodiment, for each optical communication device, the coupler 102 in the identification device is connected to the pigtail of the optical communication device. The adjustable optical pulse generator 101 sends one pulse signal to the pigtail of the optical communication device each time, and obtains the Rayleigh scattering information of the pigtail under the pulse signal. In this way, different pulse signals are sent to the pigtail of the optical communication device multiple times, and the identification module 104 obtains the Rayleigh scattering information of the pigtail under each pulse signal. The identification module 104 combines the plurality of pieces of Rayleigh scattering information to obtain the encoding information of the pigtail.

[0101] In step 902, for each pigtail, the identification module 104 stores the encoding information of the pigtail and the number of the optical communication device to which the pigtail is connected in the local or in the storage device.

[0102] In step 903, when identifying the optical communication device to be identified at the remote end, the adjustable optical pulse generator 101 sends a plurality of pulse signals to the first fiber link, so that the identification module 104 obtains the encoding information of the first fiber link. The plurality of pulse signals are sent one by one.

[0103] In the embodiment, the first optical fiber link is the optical fiber link where the pigtail of the optical communication device is located, the coupler 102 in the identification device is connected with the first optical fiber link, i.e. connected with the pigtail of the optical communication device, and there can be other optical fiber segments or optical devices such as optical switches in the connection. The adjustable optical pulse generator 101 sends a kind of pulse signal to the first optical fiber link each time, and the identification module 104 obtains the Rayleigh scattering information of the first optical fiber link under the pulse signal. In this way, different pulse signals are sent to the first optical fiber link multiple times, the Rayleigh scattering information of the first optical fiber link under each pulse signal is obtained, and thus multiple pieces of Rayleigh scattering information of the first optical fiber link are obtained. The identification module 104 combines the multiple pieces of Rayleigh scattering information together to obtain the encoding information of the first optical fiber link, i.e. the first encoding information.

[0104] In step 904, the identification module 104 determines the third encoding information matching the first encoding information in the stored encoding information of the pigtail, and if the third encoding information corresponds to the number of the to-be-tested optical communication device, it is determined that the first optical fiber link is connected with the to-be-tested optical communication device, and if the third encoding information does not correspond to the number of the to-be-tested optical communication device, it is determined that the first optical fiber link is not connected with the to-be-tested optical communication device.

[0105] In the embodiment, the identification module 104 determines the similarity of the first encoding information and the encoding information of each stored pigtail to obtain multiple similarities. For example, the identification module 104 can determine the encoding information of the pigtail of the optical communication device in the first encoding information according to the approximate distance where the optical communication device is located, and determine the similarity of the encoding information and the encoding information of each stored pigtail. The size relationship of each similarity and the first threshold value is determined, and the third encoding information to which the largest similarity belongs is determined. It is determined whether the number corresponding to the third encoding information is the number of the to-be-tested optical communication device, and if it is the number of the to-be-tested optical communication device, it is determined that the first optical fiber link is connected with the to-be-tested optical communication device, and otherwise it is determined that the first optical fiber link is not connected with the to-be-tested optical communication device.

[0106] Optionally, when it is determined that the first optical fiber link is not connected with the to-be-tested optical communication device, the number of the optical communication device corresponding to the third encoding information can also be outputted to enable the user to know the optical communication device connected by the first optical fiber link.

[0107] Through the flow shown in FIG. 9, it can be identified whether the specified optical communication device is connected at the remote end without the need to go to the site to check, and the identification efficiency can be improved.

[0108] The application scenario four is that the optical communication device has multiple tail fibers, each tail fiber corresponds to a port, the remote end identifies the port number connected, and the optical communication device can be an optical cross-connect (OXC) device, etc. Referring to FIG. 10, in FIG. 10, the identification device can be connected with one to-be-tested port at a time, each to-be-tested port has one tail fiber, and the tail fiber is used to identify the port connected by the tail fiber.

[0109] FIG. 11 provides a flowchart of identifying the port, referring to steps 1101 to 1104, and taking identifying the port connected by the first optical fiber link as an example, the tail fiber connected by the port is known, and in addition, in the case that the tail fiber has been fused with the optical fiber segment, the optical fiber segment including the tail fiber and the optical fiber segment fused with the tail fiber is known.

[0110] In step 1101, the identification device obtains the coding information of the tail fiber of each port.

[0111] In the embodiment, for each port, the connection of the coupler 102 in the identification device and the tail fiber of the port, the adjustable optical pulse generator 101 sends one pulse signal to the tail fiber of the port at a time, and obtains the Rayleigh scattering information of the tail fiber under the pulse signal, so that different pulse signals are sent to the tail fiber of the port multiple times, and the identification module 104 obtains the Rayleigh scattering information of the tail fiber under each pulse signal, thereby obtaining multiple pieces of Rayleigh scattering information of the tail fiber. The identification module 104 combines the multiple pieces of Rayleigh scattering information together to obtain the coding information of the tail fiber.

[0112] In step 1102, for each tail fiber, the identification module 104 stores the coding information of the tail fiber and the number of the port connected by the tail fiber in the local or in the storage device.

[0113] In step 1103, when identifying the to-be-tested port from the remote end, the adjustable optical pulse generator 101 sends multiple pulse signals to the first optical fiber link, so that the identification module 104 obtains the coding information of the first optical fiber link, and the multiple pulse signals are sent one by one.

[0114] In the embodiment, the first optical fiber link is the optical fiber link where the tail fiber of the port is located, the coupler 102 in the identification device is connected with the first optical fiber link, i.e., connected with the tail fiber of the port, and there can be other optical fiber segments or optical devices such as optical switches in the connection. The adjustable optical pulse generator 101 sends one kind of pulse signal to the first optical fiber link each time, and the identification module 104 obtains the Rayleigh scattering information of the first optical fiber link under the pulse signal. In this way, different pulse signals are sent to the first optical fiber link multiple times, and the Rayleigh scattering information of the first optical fiber link under each pulse signal is obtained. The identification module 104 combines the multiple pieces of Rayleigh scattering information together to obtain the encoding information of the first optical fiber link, i.e., the first encoding information.

[0115] In step 1104, the identification module 104 determines the fourth encoding information that matches the first encoding information in the stored encoding information of the tail fiber, and determines that the first optical fiber link is connected with the to-be-tested port if the fourth encoding information corresponds to the number of the to-be-tested port, or determines that the first optical fiber link is not connected with the to-be-tested port if the fourth encoding information does not correspond to the number of the to-be-tested port.

[0116] In the embodiment, the identification module 104 determines the similarity between the first encoding information and the encoding information of each tail fiber stored, and obtains multiple similarities. For example, the identification module 104 can determine the encoding information of the tail fiber of the port in the first encoding information according to the approximate distance where the optical communication device is located, and determine the similarity between the encoding information and the encoding information of each tail fiber stored. It is determined whether each similarity exceeds the first threshold, and the fourth encoding information to which the largest similarity belongs is determined. It is determined whether the number corresponding to the fourth encoding information is the number of the to-be-tested port, and it is determined that the first optical fiber link is connected with the to-be-tested port if the number is the number of the to-be-tested port, or it is determined that the first optical fiber link is not connected with the to-be-tested port if the number is not the number of the to-be-tested port.

[0117] Optionally, when it is determined that the first optical fiber link is not connected with the to-be-tested device, the number of the port corresponding to the fourth encoding information can also be output, so that the user knows the port connected by the first optical fiber link.

[0118] Through the flow shown in FIG. 11, it can be determined whether the specified port is connected at the remote end without the need to go to the scene to check, and the identification efficiency can be improved.

[0119] In the scheme shown in the present application, more Rayleigh scattering information of the optical fiber segment in the optical fiber link is obtained by sending multiple pulse signals to the optical fiber link, so that the optical fiber segments can be more accurately distinguished, the shortest length of the identifiable optical fiber is reduced, and the scheme can be applied to some short optical fiber identification scenarios.

[0120] In the preceding text, the first fiber optic link was deployed in a scenario where the temperature remained constant or changed minimally. However, in practical applications, the first fiber optic link might be deployed in scenarios where the temperature varies. For example, if the first fiber optic link is deployed in an outdoor environment, the ambient temperature around the first fiber optic link will change as the outdoor temperature changes. The method for identifying fiber optic connection information can also be applied to scenarios where the ambient temperature changes.

[0121] Rayleigh scattering information in optical fibers changes with the ambient temperature. Even if the fiber connections remain unchanged, Rayleigh scattering information at the same wavelength will change with temperature variations. In single-mode fibers, there is a direct correlation between temperature and wavelength changes. For example, 0.01 nm corresponds to a 1°C temperature change; that is, the Rayleigh scattering curve obtained from an ambient temperature of 25°C with a 1550 nm wavelength pulse signal is the same as the Rayleigh scattering curve obtained from an ambient temperature of 30°C with a 1550.05 nm wavelength pulse signal.

[0122] Multiple wavelengths include N wavelengths, where N wavelengths are λ1, λ2, λ3...λ N N wavelengths are arranged in ascending order, with equal spacing between adjacent wavelengths. Based on the method described above, Rayleigh scattering information for each wavelength of the first fiber optic link is obtained, resulting in N Rayleigh scattering information segments. These N Rayleigh scattering information segments are divided into NM groups according to the N wavelengths, with each group representing a sub-coded segment of the first fiber optic link. Therefore, the first coded segment includes NM sub-coded segments, and the first sub-coded segment includes λ1 to λ... M+1 The Rayleigh scattering information corresponding to the pulse signal, the second sub-coded information includes λ2 to λ M+2 The Rayleigh scattering information corresponding to the pulse signal, the third sub-coded information includes λ3 to λ M+3 The Rayleigh scattering information corresponding to the pulse signal, and so on, the NMth sub-encoded information includes λ N-M To λ N The Rayleigh scattering information corresponding to the pulse signal. Thus, for the same fiber segment, when the temperature change is λ2-λ1, the measured i-th sub-coded information changes to the original (i+1)-th sub-coded information, where i is greater than or equal to 1 and less than or equal to NM-1. When the temperature change is λ3-λ1, the measured j-th sub-coded information changes to the original (j+2)-th sub-coded information, where j is greater than or equal to 1 and less than or equal to NM-2, and so on. N When the temperature changes to -M-λ1, the measured first sub-coded information changes to the original NM-th sub-coded information. Thus, it can be seen that this method can compensate for ±(λ) / 2. N-M The temperature change corresponding to -λ1).

[0123] The encoding information of each known fiber segment in the encoding information set includes N-M pieces of sub-encoding information, and the encoding information obtained by the last time of the first fiber link detection also includes N-M pieces of sub-encoding information.

[0124] The N-M pieces of sub-encoding information of the first fiber link are matched in the encoding information set, and the matching principle is the same in different application scenarios. The principle is that for any fiber segment of the first fiber link, the N-M pieces of sub-encoding information of the fiber segment are matched with the N-M pieces of sub-encoding information of each known fiber segment respectively. If the similarity of at least one piece of sub-encoding information of the fiber segment to at least one piece of sub-encoding information of a certain known fiber segment exceeds a first threshold, it is determined that the fiber segment is the known fiber segment, otherwise, it is determined that the fiber segment does not exist in the known fiber segment.

[0125] In the application scenario of identifying the connection relationship of the optical fiber, based on the matching principle, each fiber segment in the first fiber link can be identified, so that the connection relationship of the optical fiber in the first fiber link is identified.

[0126] In the application scenario of identifying the to-be-measured optical communication equipment, based on the matching principle, the tail fiber in the first fiber link can be identified, so that the optical communication equipment connected by the first fiber link is identified.

[0127] In the application scenario of identifying the to-be-measured port, based on the matching principle, the tail fiber in the first fiber link can be identified, so that the port connected by the first fiber link is identified.

[0128] In the scenario of identifying whether the connection relationship of the optical fiber changes, the N-M pieces of sub-encoding information of the fiber segment in the same position in the two measurements are determined. In the N-M pieces of sub-encoding information of the last measurement, it is determined whether there is at least one piece of sub-encoding information with a similarity to at least one piece of sub-encoding information of the current measurement exceeding a first threshold. If the similarity is greater than the first threshold, it is determined that the fiber segment is the same fiber segment, otherwise it is determined that it is not the same fiber segment. Based on this, it is determined whether each fiber segment is the same, and then it is identified whether the connection relationship of the optical fiber changes.

[0129] It should be noted that the interval of the two adjacent wavelengths can be set according to the minimum temperature change to be identified, for example, the interval of the two adjacent wavelengths is 0.01 nm, which can identify a temperature change of 1℃, the interval of the two adjacent wavelengths is 0.02 nm, which can identify a temperature change of 2℃, based on this, the interval of the two adjacent wavelengths is X nm, which can identify a temperature change of Y℃, X*100=Y.

[0130] As described above, in order to compensate for temperature changes, it is necessary to send pulses of multiple wavelengths during the library building and actual measurement. Due to the possible temperature changes, in the process of identifying the match, two Rayleigh scattering curves can be matched to meet the condition that the spectral range of the light source overlaps by more than half during the two measurements, that is, the light source needs to be tuned at a step of half the line width of the light source, so the number of times the pulse signal needs to be sent is relatively large, resulting in low efficiency of the library building (i.e., establishing a set of coded information) stage and the identification stage. Moreover, when using a direct detection OTDR as a monitoring device, in order to make the Rayleigh curve more stable, a laser with a relatively wide line width needs to be used as the light source, at which time the Rayleigh curve has less stripe fluctuation, making the system extremely vulnerable to failure when the signal-to-noise ratio is low.

[0131] Based on this, in the embodiments of the present application, a swept light pulse signal (the swept pulse signal is a pulse signal with a changing frequency) is used as the probe pulse signal, which can also be said to be a pulse signal with a scanning frequency. The Rayleigh scattering curve of different frequency components can be obtained during a single pulse signal measurement, covering a larger temperature change, reducing the number of times the pulse signal is sent, improving the library building efficiency and identification efficiency, while ensuring high contrast of the curve and supporting identification of the optical fiber at a lower signal-to-noise ratio. The comparison between the swept light pulse signal and the non-swept light pulse signal (the non-swept pulse signal is a pulse signal with no change in frequency) is shown in FIGS. 12 and 13, where the horizontal axis is time and the vertical axis is wavelength in nm. FIG. 12 shows the wavelength and time of the non-swept light pulse signal, and FIG. 13 shows the wavelength and time of the swept light pulse signal. As can be seen from FIG. 12, the pulse signal emitted each time is adjusted at the center wavelength, and the frequency does not change. As can be seen from FIG. 13, the pulse emitted each time is adjusted at the center wavelength, and also has a change in frequency, and the frequencies of the pulse signals of adjacent center wavelengths overlap, and the length of the overlap is set according to actual needs, such as the relationship between temperature change and wavelength change. In FIG. 13, the frequency of the swept light pulse signal is shown to be linearly changed, and in another example, the frequency of the swept light pulse signal can also not be linearly changed.

[0132] For example, the identification device is a tunable wavelength pulse compression OTDR system, as shown in Fig. 14, the identification device comprises a wavelength-switching supporting light source 10, a first coupler 11, a modulator 12, a circulator (or a second coupler) 13, a balanced photoelectric detector 14 and an identification module 104. The first coupler 11 is located on the output light path of the wavelength-switching supporting light source 10, the modulator 12 is located on one of the output light paths of the first coupler 11, and the balanced photoelectric detector 14 is located on the other output light path of the first coupler 11. The circulator (or the second coupler) 13 is connected with the optical fiber link to be measured. The balanced photoelectric detector 14 is also located on the output light path of the circulator (or the second coupler) 13, and the identification module 104 is located on the output light path of the balanced photoelectric detector 14.

[0133] During measurement, the wavelength-switching supporting light source 10 outputs a light signal with a first center wavelength, which is divided into two light signals by the first coupler 11. The first light signal is sent to the balanced photoelectric detector 14, and the second light signal is sent to the modulator 12. The light splitting ratio is set according to actual needs, for example, the light splitting ratio of the first light signal to the second light signal is 10:90, or 30:70, etc. The modulator 12 modulates the second light signal to send a sweep pulse signal with a center wavelength of the first center wavelength. The sweep pulse signal is sent to the connected optical fiber link through the circulator (or the second coupler) 13. The optical fiber link generates Rayleigh scattering during transmission of the sweep pulse, and sends the light signal obtained by Rayleigh scattering to the balanced photoelectric detector 14. The balanced photoelectric detector 14 coherently receives the light signal using the first light signal to obtain an electrical signal, which is sent to the identification module 104. The identification module 104 processes the electrical signal to obtain the encoding information of the optical fiber link.

[0134] In this way, according to the above manner, the encoding information of the optical fiber link is obtained by sending pulse signals with different center wavelengths for multiple times.

[0135] It should be noted that in Fig. 14, coherent reception is used, and in another way, direct detection reception can also be used.

[0136] For example, the identification device is a wavelength-tunable external modulation optical frequency-domain reflectometer (OFDR) system, as shown in FIG. 15, and the identification device includes a wavelength-switching light source 10, a modulator 12, a first coupler 11, a circulator (or a second coupler) 13, a balanced photodetector 14, and an identification module 104. The modulator 12 is located on an output light path of the wavelength-switching light source 10, the first coupler 11 is located on an output light path of the modulator 12, the circulator (or the second coupler) 13 is located on one output light path of the first coupler 11, and the balanced photodetector 14 is located on the other output light path of the first coupler 11. The circulator (or the second coupler) 13 is connected to the optical fiber link to be measured. The balanced photodetector 14 is also located on an output light path of the circulator (or the second coupler) 13, and the identification module 104 is located on an output light path of the balanced photodetector 14.

[0137] During measurement, the wavelength-switching light source 10 outputs a light signal of a first center wavelength, which passes through the modulator 12. The modulator 12 modulates the light signal of the first center wavelength into a swept-frequency pulse signal, which is output to the first coupler 11. The first coupler 11 divides the swept-frequency pulse signal into two light signals, a first light signal is sent to the balanced photodetector 14, and a second light signal is sent to the circulator (or the second coupler) 13. The splitting ratio is set according to actual needs, for example, the splitting ratio of the first light signal to the second light signal is 10:90, or 30:70, etc. The swept-frequency pulse is sent to the connected optical fiber link through the circulator (or the second coupler) 13. The optical fiber link occurs Rayleigh scattering during transmission of the swept-frequency pulse, and the light signal obtained by Rayleigh scattering is sent to the balanced photodetector 14. The balanced photodetector 14 coherently receives the light signal using the first light signal to obtain an electrical signal, which is sent to the identification module 104. The identification module 104 processes the electrical signal to obtain the encoding information of the optical fiber link.

[0138] In this way, according to the above manner, the encoding information of the optical fiber link is obtained by sending different center wavelength pulse signals multiple times.

[0139] It should be noted that the above is an example of each wavelength of the pulse signal being a swept frequency pulse signal, and only part of the wavelength of the pulse signal being a swept frequency pulse signal, and the rest of the wavelength of the pulse signal being a non-swept frequency pulse signal. Each wavelength of the swept frequency pulse signal can be a long pulse signal or a short pulse signal, and the pulse width is not limited. In addition, in FIGS. 14 and 15, the identification module 104 is located in the identification device, and in another example, the identification device 104 is located outside the identification device and is connected with the identification device. In FIGS. 14 and 15, the pulse signal of a center wavelength can also be sent multiple times to obtain the encoding information of the corresponding optical fiber link at the center wavelength.

[0140] The above-mentioned optical signal output by the wavelength switching light source 10 can be a continuous optical signal or a single-wavelength pulse optical signal. The modulator 12 can be any kind of modulator, and the embodiments of the present application are not limited.

[0141] In FIGS. 14 and 15, the coherent receiving mode is used, which can preserve the high contrast of the Rayleigh scattering curve and support the identification of the optical fiber at a lower signal-to-noise ratio compared with the direct detection receiving mode.

[0142] When the identification device shown in FIGS. 14 and 15 is applied to FIG. 4, the identification flowchart is shown in FIG. 16, steps 1 to 7.

[0143] Step 1: The identification device is connected to each port of the ODF and the fusion fiber tray in the cable distribution box, respectively.

[0144] Step 2: The identification device transmits a plurality of swept frequency pulse signals of different wavelengths to obtain the corresponding encoding information of each port.

[0145] Step 3: The identification device uploads the port information and the encoding information to the database or stores them in the storage space of the identification device. The port information includes the ODF / cable distribution box and the port number of each fusion fiber tray.

[0146] Step 4: After the optical path is connected, the identification device is set in the machine room and connected with the first optical fiber link, and a plurality of swept frequency pulse signals of different wavelengths are transmitted one by one.

[0147] Step 5: The positions of the ODF and the cable distribution box are identified through the reflection peak of the port connector, which is used for optical fiber segmentation, and the encoding information of each optical fiber segment is obtained.

[0148] Step 6: The encoding information of each optical fiber segment in the first optical fiber link is matched and searched in the database, and when the encoding information is matched, the port information corresponding to the encoding information in the database is output. According to this process, the port information corresponding to all optical fiber segments in the first optical fiber link is obtained.

[0149] Step 7: output the connection relationship between the ODF and the port in the cable distribution box.

[0150] The detailed description of FIG. 16 can refer to the flow in FIG. 5, which will not be repeated here.

[0151] Here, the identification device in FIGS. 14 and 15 is taken as an example to identify the connection relationship between the ports of the fiber fusion tray. The identification device can also be applied to FIGS. 7, 9, and 11, which will not be repeated here.

[0152] It should be noted that, although the identification device in the embodiments of the present application identifies short optical fibers, the identification device can also identify long optical fibers. For example, in the scenario of identifying long optical fibers, the adjustable optical pulse generator 101 is controlled to output one or more pulse signals. When multiple pulse signals are used, the identification accuracy can be improved. In the scenario of identifying short optical fibers, the optical pulse generator 101 is controlled to output multiple pulse signals.

[0153] FIG. 3 provides a structural schematic diagram of a device for identifying optical fiber connection information, which is an identification device. The identification device includes:

[0154] The optical pulse generator 101 is configured to send multiple pulse signals to the first optical fiber link, the multiple pulse signals including pulse signals of multiple wavelengths or pulse signals of multiple pulse widths at a first wavelength, and the multiple pulse signals are sent one by one.

[0155] The identification module 104 is configured to obtain Rayleigh scattering information of the first optical fiber link based on the multiple pulse signals, to obtain first encoding information of the first optical fiber link.

[0156] Based on a matching relationship of the first encoding information in an encoding information set, the connection information of the first optical fiber link is identified, the encoding information set including encoding information of multiple known optical fiber segments and / or encoding information obtained by last detection of the first optical fiber link.

[0157] In an optional manner, for a second wavelength in the multiple wavelengths, the pulse signal of the second wavelength is a pulse signal of a scanning frequency, and the pulse signal of the second wavelength overlaps with the frequency of the pulse signal of an adjacent wavelength in the multiple wavelengths.

[0158] In an optional manner, the Rayleigh scattering information of the first optical fiber link is obtained by means of coherent detection.

[0159] In an optional manner, the first optical fiber link includes multiple optical fiber segments connected in series, and the first encoding information includes encoding information of each optical fiber segment in the multiple optical fiber segments.

[0160] The identification module 104 is configured to:

[0161] For each optical fiber segment, in the set of encoding information, second encoding information matching the encoding information of the optical fiber segment is determined, and the optical fiber segment is determined as a known optical fiber segment to which the second encoding information belongs;

[0162] The determined known optical fiber segments are sorted according to the order of the plurality of optical fiber segments in the first optical fiber link, to obtain an optical fiber connection relationship in the first optical fiber link.

[0163] In an optional manner, each known optical fiber segment is connected with a fusion splicing tray port of an optical cable distribution box or an optical fiber distribution frame;

[0164] The identification module 104 is further configured to:

[0165] Based on the optical fiber connection relationship, a connection relationship of the fusion splicing tray ports in the optical cable distribution box or the optical fiber distribution frame is generated.

[0166] In an optional manner, the identification module 104 is configured to:

[0167] If the first encoding information matches the encoding information obtained by the last time of detecting the first optical fiber link, it is determined that the optical fiber connection relationship of the first optical fiber link has not changed;

[0168] If the first encoding information does not match the encoding information obtained by the last time of detecting the first optical fiber link, it is determined that the optical fiber connection relationship of the first optical fiber link has changed.

[0169] In an optional manner, each known optical fiber segment is a pigtail of an optical communication device;

[0170] The identification module 104 is configured to:

[0171] In the set of encoding information, third encoding information matching the first encoding information is determined;

[0172] If the third encoding information corresponds to the to-be-tested optical communication device, it is determined that the first optical fiber link is connected with the to-be-tested optical communication device;

[0173] If the third encoding information does not correspond to the to-be-tested optical communication device, it is determined that the first optical fiber link is not connected with the to-be-tested optical communication device.

[0174] In an optional manner, each known optical fiber segment is a pigtail of a port of an optical communication device;

[0175] The identification module 104 is configured to:

[0176] In the set of encoding information, fourth encoding information matching the first encoding information is determined;

[0177] If the fourth encoding information corresponds to the to-be-tested port, it is determined that the first fiber link is connected with the to-be-tested port.

[0178] If the fourth encoding information does not correspond to the to-be-tested port, it is determined that the first fiber link is not connected with the to-be-tested port.

[0179] In an optional mode, the device is applied to a temperature change identification scenario.

[0180] The plurality of pulse signals include pulse signals of N wavelengths, adjacent wavelengths in the N wavelengths have the same wavelength interval, and N is greater than 1.

[0181] The first encoding information includes N-M pieces of sub-encoding information, each piece of sub-encoding information includes Rayleigh scattering information corresponding to pulse signals of M+1 adjacent wavelengths, the minimum wavelength corresponding to the Rayleigh scattering information included in the i-th piece of sub-encoding information is adjacent to the minimum wavelength corresponding to the Rayleigh scattering information included in the i+1-th piece of sub-encoding information, i is greater than or equal to 1 and less than or equal to N-M.

[0182] The identification module 104 is configured to:

[0183] If there is at least one piece of sub-encoding information in the N-M pieces of sub-encoding information that matches the encoding information in the encoding information set, the connection information of the first fiber link is identified based on the matched encoding information.

[0184] The functions performed by the device have been described in detail in the method embodiments in the foregoing description, and will not be described here again.

[0185] Those skilled in the art can realize that, in combination with the method steps and units described in the embodiments disclosed in the present application, the methods can be realized by electronic hardware or a combination of computer hardware and electronic hardware. In order to clearly illustrate the interchangeability of hardware and software, the steps and components of the embodiments have been described in the above description in general. Whether the functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0186] In several embodiments provided in the present application, it should be understood that the disclosed system architecture, apparatus and method can be implemented in other manners. For example, the described apparatus embodiments are merely schematic. For example, the division of the modules is merely a logical function division. There can be another division manner for the actual implementation, for example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or modules, and can be electric, mechanical or in other forms.

[0187] The modules illustrated as separated components can or can not be physically separated, and the components illustrated as modules can or can not be physical modules, i.e., can be located in one place, or can be distributed to multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiments of the present application.

[0188] In addition, the modules in each of the embodiments of the present application can be integrated in one processing module, or each module can be physically present alone, or two or more modules can be integrated in one module.

[0189] If part of the functions in the integrated module are implemented or used in the form of a software function module, the part of the functions can be stored in a computer readable storage medium, and the part of the functions is the function of determining the connection information of the first optical fiber link based on the first encoding information.

[0190] In the present application, the terms "first" and "second" and the like are used to distinguish between the same items or similar items with substantially the same function and action. It should be understood that there is no logical or time sequence dependency between "first" and "second", and the quantity and execution order are not limited. It should also be understood that although the following description uses the terms "first" and "second" and the like to describe various elements, these elements should not be limited by the terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of various examples, the first encoding information can be referred to as the second encoding information, and similarly, the second encoding information can be referred to as the first encoding information. The first encoding information and the second encoding information can both be encoding information, and in some cases, can be separate and different encoding information.

[0191] In the present application, the term "multiple" means two or more.

[0192] The above description is only exemplary embodiments of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be encompassed in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of identifying fiber connection information, characterized by, The method comprises: sending a plurality of pulse signals to a first optical fiber link, the plurality of pulse signals comprising pulse signals of a plurality of wavelengths or pulse signals of a plurality of pulse widths of a first wavelength, the plurality of pulse signals being sent one by one; obtaining Rayleigh scattering information of the first optical fiber link based on the plurality of pulse signals to obtain first encoding information of the first optical fiber link; identifying connection information of the first optical fiber link based on a matching relationship of the first encoding information in an encoding information set, the encoding information set comprising encoding information of a plurality of known optical fiber sections and / or encoding information obtained by last detection of the first optical fiber link.

2. The method of claim 1, wherein, For a second wavelength of the plurality of wavelengths, the pulse signal of the second wavelength is a pulse signal of a scanning frequency, and the pulse signal of the second wavelength overlaps with the frequency of the pulse signal of an adjacent wavelength in the plurality of wavelengths.

3. The method of claim 2, wherein, The Rayleigh scattering information of the first optical fiber link is obtained by coherent detection.

4. The method according to any one of claims 1 to 3, characterized in that, The first optical fiber link comprises a plurality of optical fiber sections connected in series, and the first encoding information comprises encoding information of each optical fiber section in the plurality of optical fiber sections. The identifying of the connection information of the first optical fiber link based on the matching relationship of the first encoding information in the encoding information set comprises: For each optical fiber section, determining second encoding information matching the encoding information of the optical fiber section in the encoding information set, and determining the optical fiber section as a known optical fiber section to which the second encoding information belongs; sequencing the determined known optical fiber sections according to the order of the plurality of optical fiber sections in the first optical fiber link to obtain an optical fiber connection relationship in the first optical fiber link.

5. The method of claim 4, wherein, Each known optical fiber section is connected with a fusion splicing tray port of a fiber distribution box or a fiber distribution frame. The method further comprises: generating a connection relationship of the fusion splicing tray ports in the fiber distribution box or the fiber distribution frame based on the optical fiber connection relationship.

6. The method according to any one of claims 1 to 3, characterized in that, The identifying of the connection information of the first optical fiber link based on the matching relationship of the first encoding information in the encoding information set comprises: if the first encoding information matches the encoding information obtained by last detection of the first optical fiber link, determining that the optical fiber connection relationship of the first optical fiber link has not changed; if the first encoding information does not match the encoding information obtained by last detection of the first optical fiber link, determining that the optical fiber connection relationship of the first optical fiber link has changed.

7. The method according to any one of claims 1 to 3, characterized in that, Each known optical fiber section is a tail fiber of an optical communication device. The identifying of the connection information of the first optical fiber link based on the matching relationship of the first encoding information in the encoding information set comprises: determining third encoding information matching the first encoding information in the encoding information set; if the third encoding information corresponds to a to-be-tested optical communication device, determining that the first optical fiber link is connected with the to-be-tested optical communication device; if the third encoding information does not correspond to the to-be-tested optical communication device, determining that the first optical fiber link is not connected with the to-be-tested optical communication device.

8. The method according to any one of claims 1 to 3, characterized in that, Each known optical fiber section is a tail fiber of a port of an optical communication device. The matching relationship of the first encoding information in the encoding information set is used to identify the connection information of the first fiber link, and the connection information of the first fiber link includes: In the encoding information set, fourth encoding information matching the first encoding information is determined; If the fourth encoding information corresponds to the to-be-tested port, it is determined that the first fiber link is connected with the to-be-tested port; If the fourth encoding information does not correspond to the to-be-tested port, it is determined that the first fiber link is not connected with the to-be-tested port.

9. The method according to any one of claims 1 to 7, characterized in that, The method is applied to a temperature change identification scene; The multiple pulse signals include pulse signals of N wavelengths, adjacent wavelengths in the N wavelengths have the same wavelength interval, and N is greater than 1; The first encoding information includes N-M pieces of sub-encoding information, each piece of sub-encoding information includes Rayleigh scattering information corresponding to pulse signals of M+1 adjacent wavelengths, a minimum wavelength corresponding to the i-th piece of sub-encoding information is adjacent to a minimum wavelength corresponding to the i+1-th piece of sub-encoding information, i is greater than or equal to 1 and less than or equal to N-M; The matching relationship of the first encoding information in the encoding information set is used to identify the connection information of the first fiber link, and the connection information of the first fiber link includes: If at least one piece of sub-encoding information in the N-M pieces of sub-encoding information matches the encoding information in the encoding information set, the connection information of the first fiber link is identified based on the matched encoding information.

10. An apparatus for identifying fiber connection information, the apparatus comprising: The device includes: An adjustable optical pulse generator is configured to send multiple pulse signals to the first fiber link, the multiple pulse signals include pulse signals of multiple wavelengths or pulse signals of multiple pulse widths of a first wavelength, and the multiple pulse signals are sent one by one; An identification module is configured to: obtain Rayleigh scattering information of the first fiber link based on the multiple pulse signals to obtain first encoding information of the first fiber link; identify connection information of the first fiber link based on a matching relationship of the first encoding information in an encoding information set, the encoding information set including encoding information of multiple known fiber sections and / or encoding information obtained by last detection of the first fiber link.

11. The apparatus of claim 10, wherein, For a second wavelength in the multiple wavelengths, the pulse signal of the second wavelength is a pulse signal of a scanning frequency, and the pulse signal of the second wavelength and the pulse signal of an adjacent wavelength in the multiple wavelengths have a frequency overlap.

12. The apparatus of claim 11, wherein, The Rayleigh scattering information of the first fiber link is obtained by coherent detection.

13. The apparatus of any one of claims 10 to 12, wherein, The first fiber link includes multiple fiber sections connected in series, and the first encoding information includes encoding information of each fiber section in the multiple fiber sections; The identification module is configured to: for each fiber section, determine second encoding information matching the encoding information of the fiber section in the encoding information set, and determine the fiber section as a known fiber section to which the second encoding information belongs; sort the determined known fiber sections according to the order of the multiple fiber sections in the first fiber link to obtain a fiber connection relationship in the first fiber link.

14. The apparatus of any one of claims 10 to 12, wherein, Each known fiber section is connected with a fusion fiber tray port of a fiber distribution frame or a fiber cable junction box. The identification module is further configured to: Based on the fiber connection relationship, a connection relationship of a fusion splicing disc port in the fiber distribution frame or the fiber cable terminal box is generated.

15. The apparatus of any one of claims 10 to 12, wherein, The identification module is configured to: If the first encoding information matches the encoding information obtained by the last time of detecting the first fiber link, it is determined that the fiber connection relationship of the first fiber link has not changed. If the first encoding information does not match the encoding information obtained by the last time of detecting the first fiber link, it is determined that the fiber connection relationship of the first fiber link has changed.

16. The apparatus of any one of claims 10 to 12, wherein, Each known fiber segment is a tail fiber of an optical communication device; The identification module is configured to: In the set of encoding information, third encoding information matching the first encoding information is determined. If the third encoding information corresponds to the to-be-tested optical communication device, it is determined that the first fiber link is connected with the to-be-tested optical communication device. If the third encoding information does not correspond to the to-be-tested optical communication device, it is determined that the first fiber link is not connected with the to-be-tested optical communication device.

17. The apparatus of any one of claims 10 to 12, wherein, Each known fiber segment is a tail fiber of a port of an optical communication device; The identification module is configured to: In the set of encoding information, fourth encoding information matching the first encoding information is determined. If the fourth encoding information corresponds to the to-be-tested port, it is determined that the first fiber link is connected with the to-be-tested port. If the fourth encoding information does not correspond to the to-be-tested port, it is determined that the first fiber link is not connected with the to-be-tested port.

18. The apparatus of any one of claims 10 to 17, wherein, The device is applied to a temperature change identification scenario; The multiple pulse signals include pulse signals of N wavelengths, adjacent wavelengths in the N wavelengths have the same wavelength interval, and N is greater than 1; The first encoding information includes N-M pieces of sub-encoding information, each piece of sub-encoding information includes Rayleigh scattering information corresponding to pulse signals of M+1 adjacent wavelengths, a minimum wavelength corresponding to the i-th piece of sub-encoding information is adjacent to a minimum wavelength corresponding to the i+1-th piece of sub-encoding information, i is greater than or equal to 1 and less than or equal to N-M; The identification module is configured to: If there is at least one piece of sub-encoding information in the N-M pieces of sub-encoding information that matches encoding information in the set of encoding information, the connection information of the first fiber link is identified based on the matched encoding information.

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