Bidirectional sensing integrated system and polarization state disturbance positioning method thereof

Abstract

The invention provides a bidirectional communication and sensing integrated system, and aims to realize a sensing function while giving consideration to communication, integrate communication and sensing, and realize communication and sensing integration. Based on the system, the invention also provides a polarization state disturbance positioning method, the time interval between two adjacent frame headers of an optical signal is enabled to be the same as the time of the frame headers passing through the whole section of optical fiber link at a transmitting end, and only one frame header and one signal exist in the optical fiber link at any moment, so that the polarization disturbance can be accurately monitored; the signal processor extracts a disturbance information position according to the influence of polarization disturbance on the polarization state of an optical signal at a receiving end, and constructs an equation by using the synchronism of a bidirectional distance difference and a transmission frame header, and finally realizes the accurate positioning of the polarization disturbance; polarization disturbance appearing in an optical fiber link is positioned through the frame header of bidirectional synchronous communication, the detection distance is long, no measurement blind area exists, precision is high, sensitivity is high, and a receiving end does not need to conduct superposition through multiple times of detection.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber communication and optical fiber sensing technology, and more specifically, to a two-way interaception integrated system and a polarization state disturbance positioning method thereof. Background Art

[0002] Fiber optic sensors have been widely used in high-voltage power transmission cables, bridge structure health monitoring, airport perimeter security systems and other fields due to their advantages such as anti-electromagnetic interference and long-distance detection. Based on discrete sensor elements such as fiber Bragg gratings, or backscattering processes in optical fibers, various external environmental parameters around the optical fiber can be monitored, including temperature, strain, vibration, etc. However, the deployment cost of professional fiber optic sensor systems is high and cannot be ignored. The system's requirements for dedicated devices or optical fibers also restrict the further promotion and use of fiber optic sensors. In the past three decades, with the rapid construction of fiber optic communication systems, millions of kilometers of optical fibers have been deployed in terrestrial and submarine environments. The additional sensor functions based on optical communication cables are increasingly valued by telecom operators to provide additional business and revenue sources.

[0003] Compared with traditional fiber optic sensor systems, integrated communication sensing systems are based on deployed fiber optic networks. Thanks to the global fiber optic communication network, sensing functions can be extended not only to densely populated cities but also to wild areas. Inserting sensor channels into existing networks is a feasible solution. However, telecommunications networks may need to modify the optical architecture to implement sensing functions, which requires the addition of other additional devices, increasing the cost of implementation. Summary of the invention

[0004] In order to overcome the defects of the above-mentioned prior art that it is impossible to take into account both optical fiber communication and sensing, and that it is difficult and costly to add sensors in the fields of communication and electricity, the present invention provides a two-way integrated synaesthesia system and a polarization state disturbance positioning method thereof, which can realize the sensing function while taking into account optical fiber communication, integrate communication and sensing together, and realize synaesthesia integration.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A bidirectional synaesthesia integrated system, comprising a first optical fiber link and a second optical fiber link for transmitting optical signals in forward and reverse directions, respectively, and a signal processor;

[0007] The first optical fiber link comprises: a first transmitting end, a first optical fiber and a first receiving end connected in sequence; the second optical fiber link comprises: a second transmitting end, a second optical fiber and a second receiving end connected in sequence; the first receiving end and the second receiving end are electrically connected to a signal processor respectively;

[0008] At any time in the first optical fiber link and the second optical fiber link, there is only one frame header and optical signal;

[0009] The signal processor is used to detect two adjacent frame headers carrying polarization disturbance information in two optical signals during bidirectional transmission, obtain the distance difference between each frame header and the disturbance point during bidirectional transmission, and detect the position of the polarization disturbance point according to the distance difference.

[0010] Preferably, the implementation method of having only one frame header and optical signal at any time in the first optical fiber link and the second optical fiber link is:

[0011] For the first optical fiber link and the second optical fiber link, the time interval ΔT between two adjacent frame headers of the optical signal and the time Δτ for the frame header to pass through the optical fiber link are set to be the same.

[0012] Preferably, the first optical fiber link and the second optical fiber link have the same length, and the first optical fiber and the second optical fiber have the same refractive index.

[0013] Preferably, the time interval ΔT between two adjacent frame headers of the optical signal and the time Δτ for the frame header to pass through the optical fiber link satisfy the following relationship:

[0014]

[0015] Where n is the refractive index of the optical fiber, L is the length of the optical fiber link, and c is the speed of light in a vacuum.

[0016] Preferably, the first optical fiber link and the second optical fiber link are both optical fiber links in the power overhead ground wire composite optical cable OPGW;

[0017] The polarization disturbance information is specifically the change in polarization state of the optical signal caused by lightning strike.

[0018] The present invention also provides a polarization state disturbance positioning method based on a two-way synaesthesia integrated system, based on the above-mentioned two-way synaesthesia integrated system, comprising the following steps:

[0019] The first transmitting end sends a first polarized light signal with a frame header inserted into the first optical fiber for forward transmission; at the same time, the second transmitting end sends a second polarized light signal with a frame header inserted into the second optical fiber for reverse transmission; the first receiving end and the second receiving end receive the first polarized light signal and the second polarized light signal respectively, and convert them into the first electrical signal and the second electrical signal respectively and transmit them to the signal processor;

[0020] When the first optical fiber link and the second optical fiber link encounter a polarization disturbance event, the polarization states of the first and second polarized light signals change, and the first and second polarized light signals carry polarization disturbance information and are transmitted to the first and second receiving ends respectively;

[0021] In the signal processor, for the first and second polarized light signals, two adjacent frame headers carrying polarization disturbance information are found by a preset digital signal processing algorithm, and the distance difference between the forward frame header and the reverse frame header and the disturbance point is calculated to obtain a bidirectional distance difference;

[0022] The position of the polarization disturbance point is calculated using the bidirectional distance difference, thereby realizing polarization disturbance positioning.

[0023] Preferably, the digital signal processing algorithm is specifically:

[0024] For the first and second polarized light signals, the distance difference between the forward frame header and the reverse frame header and the disturbance point is calculated according to the following formulas:

[0025]

[0026] Where x represents the distance between the polarization disturbance point and the frame header in the optical fiber link when the disturbance occurs, L represents the length of the optical fiber link, Δt represents the time difference between the time when the disturbance occurs and the time when the frame header appears, and ΔT represents the time interval between two adjacent frame headers.

[0027] Preferably, calculating the position of the polarization disturbance point by using the bidirectional distance difference comprises:

[0028] In forward transmission, when the disturbance occurs, the distance difference between the polarization disturbance point and the forward frame header in the first optical fiber link is In reverse transmission, the distance difference between the polarization disturbance point and the reverse frame header in the second optical fiber link when the disturbance occurs is

[0029] When polarization disturbance occurs, the distance from the forward frame header to the first transmitting end and the distance from the reverse frame header to the second transmitting end are both ΔL;

[0030] Construct the following equation:

[0031] L = x 1 +x 2 +2ΔL

[0032] Solving the equation, we can get the distance from the polarization disturbance point to the first transmitting end as The distance from the polarization perturbation point to the second transmitting end is

[0033] Preferably, the signal processor detects the polarization state change of the optical signal in real time according to Malus's law, specifically:

[0034] I=I 0 cos 2 (θ F )

[0035] Where, I is the intensity of the optical signal received by the receiving end; I 0 is the intensity of the optical signal emitted by the transmitter; θ F is the bias state rotation angle.

[0036] The present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by the signal processor, the steps in the above method are implemented.

[0037] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0038] The present invention provides a two-way interoception integrated system, which aims to realize the sensing function while taking into account the communication, integrates the communication and sensing together, realizes the interoception integration, and solves the current problems of difficulty and high cost of adding sensors in the fields of communication and power.

[0039] In addition, the present invention is based on a two-way interaceptive integrated system and also provides a method for locating polarization state disturbances. At the transmitting end, the time interval between two adjacent frame headers of the optical signal is made the same as the time for the frame header to pass through the entire optical fiber link, ensuring that only one frame header and signal exist in the optical fiber link at any time, thereby ensuring that the polarization disturbance can be accurately monitored; the signal processor extracts the disturbance information position through the influence of the polarization disturbance on the power and phase of the signal light at the receiving end, and constructs an equation using the two-way distance difference and the synchronization of the transmitting frame header, thereby finally realizing the accurate positioning of the polarization disturbance;

[0040] The present invention uses the frame header of bidirectional synchronous communication to locate the polarization disturbance occurring in the optical fiber link. Compared with the traditional optical sensor method, it has a long detection distance, no measurement blind spot and high accuracy; compared with the traditional distributed optical time domain reflection method, it has high sensitivity and does not require multiple detections at the receiving end for superposition. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a structural diagram of a two-way synaesthesia integrated system provided in Example 1.

[0042] Figure 2 This is a component structure diagram of the power overhead optical cable provided in Example 2.

[0043] Figure 3 This is a structural diagram of the optical unit provided in Example 2.

[0044] Figure 4 This is a schematic diagram of the Faraday effect provided in Example 2.

[0045] Figure 5 This is a schematic diagram of the polarization perturbation effect provided in Example 2 on an optical fiber link.

[0046] Figure 6 This is a flow chart of a polarization state disturbance positioning method based on a two-way synaesthesia integrated system provided in Example 3. DETAILED DESCRIPTION

[0047] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0048] In order to better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0049] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0050] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0051] Example 1

[0052] like Figure 1 As shown, this embodiment provides a bidirectional synaesthesia integrated system, including a first optical fiber link and a second optical fiber link for transmitting optical signals in forward and reverse directions respectively, and a signal processor;

[0053] The first optical fiber link comprises: a first transmitting end, a first optical fiber and a first receiving end connected in sequence; the second optical fiber link comprises: a second transmitting end, a second optical fiber and a second receiving end connected in sequence; the first receiving end and the second receiving end are electrically connected to a signal processor respectively;

[0054] At any time in the first optical fiber link and the second optical fiber link, there is only one frame header and optical signal;

[0055] The signal processor is used to detect two adjacent frame headers carrying polarization disturbance information in two optical signals during bidirectional transmission, obtain the distance difference between each frame header and the disturbance point during bidirectional transmission, and detect the position of the polarization disturbance point according to the distance difference.

[0056] In the specific implementation process, the system directly realizes sensing based on communication signals. The principle is as follows: in the coherent reception digital signal processing, the polarization state can be extracted from the polarization multiplexed signal. Due to the sensitivity between the optical fiber vibrations caused by the polarization state environmental disturbance, the characteristic fluctuations of the polarization state can be defined to identify different vibration events;

[0057] The process of achieving communication using this system is as follows:

[0058] The first transmitting end sends out a first polarized light signal with a frame header inserted into it, which enters the first optical fiber for forward transmission; meanwhile, the second transmitting end sends out a second polarized light signal with a frame header inserted into it, which enters the second optical fiber for reverse transmission;

[0059] The first receiving end and the second receiving end receive the first polarized light signal and the second polarized light signal respectively, and convert them into the first electrical signal and the second electrical signal respectively, and transmit them to the signal processor;

[0060] Repeat the above two-way synchronous transmission and reception process to achieve optical fiber communication;

[0061] The process of realizing polarization state disturbance positioning (i.e. sensing) using this system is as follows:

[0062] When the first optical fiber link and the second optical fiber link encounter a polarization disturbance event, the polarization states of the first and second polarized light signals change, and the first and second polarized light signals carry polarization disturbance information and are transmitted to the first and second receiving ends respectively;

[0063] In the signal processor, for the first and second polarized light signals, two adjacent frame headers carrying polarization disturbance information are found by a preset digital signal processing algorithm, and the distance difference between the forward frame header and the reverse frame header and the disturbance point is calculated to obtain a bidirectional distance difference;

[0064] The position of the polarization disturbance point is calculated using the bidirectional distance difference, thereby realizing the polarization disturbance positioning;

[0065] This system can realize sensing functions while taking into account communication. Compared with traditional fiber optic sensor solutions, its advantage is that it does not require the addition of other additional devices, reducing the implementation cost; and it is possible to achieve long-distance, high-sensitivity polarization perturbation positioning, integrating communication and sensing together to achieve integrated synaesthesia.

[0066] Example 2

[0067] This embodiment provides a bidirectional synaesthesia integrated system, including a first optical fiber link and a second optical fiber link for transmitting optical signals in forward and reverse directions, respectively, and a signal processor;

[0068] The first optical fiber link comprises: a first transmitting end, a first optical fiber and a first receiving end connected in sequence; the second optical fiber link comprises: a second transmitting end, a second optical fiber and a second receiving end connected in sequence; the first receiving end and the second receiving end are electrically connected to a signal processor respectively;

[0069] At any time in the first optical fiber link and the second optical fiber link, there is only one frame header and optical signal;

[0070] The signal processor is used to detect two adjacent frame headers carrying polarization disturbance information in two optical signals during bidirectional transmission, obtain the distance difference between each frame header and the disturbance point during bidirectional transmission, and detect the position of the polarization disturbance point according to the distance difference;

[0071] The implementation method of the first optical fiber link and the second optical fiber link having only one frame header and optical signal at any time is:

[0072] For the first optical fiber link and the second optical fiber link, the time interval ΔT between two adjacent frame headers of the optical signal and the time Δτ for the frame header to pass through the optical fiber link are set to be the same;

[0073] The first optical fiber link and the second optical fiber link have the same length, and the first optical fiber and the second optical fiber have the same refractive index;

[0074] The time interval ΔT between two adjacent frame headers of the optical signal and the time Δτ for the frame header to pass through the optical fiber link satisfy the following relationship:

[0075]

[0076] Where n is the refractive index of the optical fiber, L is the length of the optical fiber link, and c is the speed of light in a vacuum;

[0077] The first optical fiber link and the second optical fiber link are both optical fiber links in the power overhead ground wire composite optical cable OPGW;

[0078] The polarization disturbance information is specifically the change in polarization state of the optical signal caused by lightning strike.

[0079] In the specific implementation process, this embodiment takes the polarization disturbance encountered in the electric power field as an example to illustrate the working process of the system;

[0080] When the power overhead ground wire composite optical cable (OPGW) encounters extreme weather such as thunderstorm season, on the one hand, some links of the power 100GOTN backbone network will be broken for many times. The reason for this abnormality is that the Faraday rotation effect caused by lightning strikes causes the polarization state of the optical signal in the overhead optical cable to fluctuate rapidly, which in turn causes the 100GOTN equipment to have bit errors; on the other hand, the high energy caused by lightning current will cause the OPGW to break, thus affecting power production, so it is very necessary to perform polarization state disturbance positioning;

[0081] Taking OPGW as an example, the structure and composition of power overhead optical cables are introduced; Figure 2 As shown in Figure 1, the structure of OPGW is mainly composed of an optical unit and a ground line unit; Figure 3 As shown, the optical unit is composed of a stainless steel or aluminum protective tube and the optical fiber therein. The optical fiber generally has an excess length (i.e., the optical fiber length is slightly longer than the protective tube) to prevent the protective tube from being gradually stretched mechanically during long-term operation, causing the optical fiber to be stressed and broken. Fiber paste is filled between the protective tube and the optical fiber to play a waterproof role. The ground wire unit is formed by spirally twisting aluminum-clad steel wires, and grease is filled between the aluminum-clad steel wires. The aluminum-clad steel wires mainly serve as a conductor for grounding protection and attract lightning strikes to avoid direct lightning strikes on the transmission phase line.

[0082] Under the action of a magnetic field, a substance that does not have optical activity also develops optical activity, which can cause the light vector to rotate. That is, when light passes through a medium that does not have optical activity under the action of a magnetic field, the vibration plane of the light will rotate. This phenomenon is called the Faraday effect. Figure 4 As shown; the angle θ of light vector rotation is proportional to the distance the light passes through the medium and the magnetic induction intensity B, and its calculation formula is as follows:

[0083] θ=VBL B

[0084] Where V is the Verdet constant, which is a characteristic constant of matter and determines the magneto-optical properties of the material. The positive or negative value of the Verdet constant depends on the type of material. When light passes through a material, if the Verdet constant is positive, the light vector will rotate clockwise; if the Verdet constant is negative, the light vector will rotate counterclockwise. For standard single-mode optical fiber, the Verdet constant at a wavelength of 1550nm at room temperature is approximately 0.53rad / (T·m).

[0085] A section of overhead optical cable struck by lightning can be approximated by a powered solenoid model. The relationship between the magnetic field formed by the lightning current near the section of the cable and the lightning current is expressed as follows:

[0086] B=μNI

[0087] Due to the Faraday rotation effect, the polarization rotation angle of the optical signal caused by lightning is obtained by Malus's law:

[0088] I=I 0 cos 2 (θ F )

[0089] Where, I is the intensity of the optical signal received by the receiving end; I 0 is the intensity of the optical signal emitted by the transmitter; θ F is the bias state rotation angle;

[0090] The optical signal reaches the receiving end and is transmitted to the signal processor after photoelectric conversion. The processor calculates the change in polarization state according to Malus's law.

[0091] At the transmitting end, the time interval between two adjacent frame headers of the signal light is set to be the same as the time it takes for the frame header to pass through the entire optical fiber link, so that the time interval ΔT between two adjacent frame headers of the signal light is the same as the time it takes for the frame header to pass through the entire optical fiber link Δτ. Where n represents the refractive index of the optical fiber, L represents the length of the optical fiber link, and c represents the speed of light in a vacuum. That is, at any time, there is only one frame header and signal in the optical fiber link, ensuring that polarization disturbances can be accurately monitored;

[0092] Under normal circumstances, the system is in an optical fiber communication mode, in which the first transmitting end sends out a first polarized light signal with a frame header inserted into the first optical fiber for forward transmission; at the same time, the second transmitting end sends out a second polarized light signal with a frame header inserted into the second optical fiber for reverse transmission; the first receiving end and the second receiving end receive the first polarized light signal and the second polarized light signal respectively, and convert them into a first electrical signal and a second electrical signal respectively for transmission to the signal processor;

[0093] When the optical fiber link of OPGW encounters a lightning strike and causes the polarization state of the optical signal to be disturbed, the optical signal carrying the polarization rotation information is extracted through a digital signal processing algorithm at the receiving end, and the relative position of the rotation in two adjacent frames is accurately located;

[0094] like Figure 5 As shown in the figure, when the polarization states of the forward and reverse signal lights change, the signal lights carrying the polarization rotation information are transmitted to the receiving ends on both sides successively; in the forward transmission, the two adjacent frame heads carrying the polarization rotation information are found through signal processing, and the distance difference between the forward frame head and the lightning strike point is determined through the corresponding ratio; in the reverse transmission, the two adjacent frame heads carrying the polarization disturbance information are found through signal processing, and the distance difference between the reverse frame head and the lightning strike point is determined through the corresponding ratio; the disturbance information position is extracted through the influence of polarization rotation on the power of the signal light at the receiving end, that is, Where x represents the distance between the lightning strike point and the frame header in the optical fiber link when a lightning strike occurs, L represents the length of the optical fiber link, Δt represents the time difference between the time when the disturbance occurs and the time when the frame header appears, and ΔT represents the time difference between two adjacent frame headers;

[0095] The equation is constructed by using the bidirectional distance difference and the synchronization of the transmission frame header to solve the lightning strike point position, thereby realizing lightning strike positioning; in forward transmission, the distance difference between the lightning strike point and the forward frame header in the optical fiber link is In reverse transmission, the distance difference between the lightning strike point and the reverse frame header in the optical fiber link is Due to the synchronization of the transmission frame header, when a lightning strike occurs, the distance between the forward frame header and the first transmitting end and the distance between the reverse frame header and the second transmitting end are both ΔL; at this time, the equation L = x 1 +x 2 +2ΔL, the distance from the lightning strike point to the first transmitting end can be solved as The distance from the lightning strike point to the second transmitting end is

[0096] This system can realize sensing functions while taking into account communication. Compared with traditional fiber optic sensor solutions, its advantage is that it does not require the addition of other additional devices, reducing the implementation cost; and it is possible to achieve long-distance, high-sensitivity polarization perturbation positioning, integrating communication and sensing together to achieve integrated synaesthesia.

[0097] Example 3

[0098] like Figure 6 As shown, this embodiment provides a polarization state disturbance positioning method based on a two-way synaesthesia integrated system, based on a two-way synaesthesia integrated system described in embodiment 1 or 2, comprising the following steps:

[0099] S1: The first transmitting end sends a first polarized light signal with a frame header inserted into it, which enters the first optical fiber for forward transmission; meanwhile, the second transmitting end sends a second polarized light signal with a frame header inserted into it, which enters the second optical fiber for reverse transmission;

[0100] S2: The first receiving end and the second receiving end receive a first polarized light signal and a second polarized light signal respectively, and convert them into a first electrical signal and a second electrical signal respectively, and transmit them to a signal processor;

[0101] S3: When the first optical fiber link and the second optical fiber link encounter a polarization disturbance event, the polarization states of the first and second polarized light signals change, and the first and second polarized light signals carry polarization disturbance information and are transmitted to the first and second receiving ends respectively;

[0102] S4: In the signal processor, for the first and second polarized light signals, two adjacent frame headers carrying polarization disturbance information are found by a preset digital signal processing algorithm, and the distance difference between the forward frame header and the reverse frame header and the disturbance point is calculated to obtain a bidirectional distance difference;

[0103] S5: The position of the polarization disturbance point is calculated using the bidirectional distance difference, thereby realizing polarization disturbance positioning.

[0104] In the specific implementation process, the first transmitting end sends out a first polarized light signal with a frame header inserted into the first optical fiber for forward transmission; at the same time, the second transmitting end sends out a second polarized light signal with a frame header inserted into the second optical fiber for reverse transmission;

[0105] The first receiving end and the second receiving end receive the first polarized light signal and the second polarized light signal respectively, and convert them into the first electrical signal and the second electrical signal respectively, and transmit them to the signal processor;

[0106] Repeat the above two-way synchronous transmission and reception process to achieve optical fiber communication;

[0107] When the first optical fiber link and the second optical fiber link encounter a polarization disturbance event, the polarization states of the first and second polarized light signals change, and the first and second polarized light signals carry polarization disturbance information and are transmitted to the first and second receiving ends respectively;

[0108] In the signal processor, for the first and second polarized light signals, two adjacent frame headers carrying polarization disturbance information are found by a preset digital signal processing algorithm, and the distance difference between the forward frame header and the reverse frame header and the disturbance point is calculated to obtain a bidirectional distance difference;

[0109] The position of the polarization disturbance point is calculated using the bidirectional distance difference, thereby realizing the polarization disturbance positioning;

[0110] This method uses the frame header of two-way synchronous communication to locate the polarization disturbance occurring in the optical fiber link. Compared with the traditional optical sensor method, it has a long detection distance, no measurement blind spot and high accuracy. Compared with the traditional distributed optical time-domain reflectometry method, it has high sensitivity and does not require multiple detections at the receiving end for superposition.

[0111] The same or similar reference numerals correspond to the same or similar components;

[0112] The terms used in the drawings to describe positional relationships are only used for illustrative purposes and should not be construed as limiting this patent;

[0113] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A two-way synaesthesia integrated system, characterized in that: comprising a first optical fiber link and a second optical fiber link for transmitting optical signals in forward and reverse directions, respectively, and a signal processor; The first optical fiber link comprises: a first transmitting end, a first optical fiber and a first receiving end connected in sequence; the second optical fiber link comprises: a second transmitting end, a second optical fiber and a second receiving end connected in sequence; the first receiving end and the second receiving end are electrically connected to a signal processor respectively; At any time in the first optical fiber link and the second optical fiber link, there is only one frame header and optical signal; The signal processor is used to detect two adjacent frame headers carrying polarization disturbance information in two optical signals during bidirectional transmission, obtain the distance difference between each frame header and the disturbance point during bidirectional transmission, and detect the position of the polarization disturbance point according to the distance difference.

2. A two-way synaesthesia integrated system according to claim 1, characterized in that: The implementation method of the first optical fiber link and the second optical fiber link having only one frame header and optical signal at any time is: For the first optical fiber link and the second optical fiber link, the time interval ΔT between two adjacent frame headers of the optical signal and the time Δτ for the frame header to pass through the optical fiber link are set to be the same.

3. A two-way synaesthesia integrated system according to claim 2, characterized in that: The first optical fiber link and the second optical fiber link have the same length, and the first optical fiber and the second optical fiber have the same refractive index.

4. The two-way synaesthesia integrated system according to claim 3, characterized in that: The time interval ΔT between two adjacent frame headers of the optical signal and the time Δτ for the frame header to pass through the optical fiber link satisfy the following relationship: Where n is the refractive index of the optical fiber, L is the length of the optical fiber link, and c is the speed of light in a vacuum.

5. A two-way synaesthesia integrated system according to any one of claims 1 to 4, characterized in that: The first optical fiber link and the second optical fiber link are both optical fiber links in the power overhead ground wire composite optical cable OPGW; The polarization disturbance information is specifically the change in polarization state of the optical signal caused by lightning strike.

6. A polarization state disturbance positioning method based on a two-way synaesthesia integrated system, based on a two-way synaesthesia integrated system as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: The first transmitting end sends a first polarized light signal with a frame header inserted into the first optical fiber for forward transmission; at the same time, the second transmitting end sends a second polarized light signal with a frame header inserted into the second optical fiber for reverse transmission; the first receiving end and the second receiving end receive the first polarized light signal and the second polarized light signal respectively, and convert them into the first electrical signal and the second electrical signal respectively and transmit them to the signal processor; When the first optical fiber link and the second optical fiber link encounter a polarization disturbance event, the polarization states of the first and second polarized light signals change, and the first and second polarized light signals carry polarization disturbance information and are transmitted to the first and second receiving ends respectively; In the signal processor, for the first and second polarized light signals, two adjacent frame headers carrying polarization disturbance information are found by a preset digital signal processing algorithm, and the distance difference between the forward frame header and the reverse frame header and the disturbance point is calculated to obtain a bidirectional distance difference; The position of the polarization disturbance point is calculated using the bidirectional distance difference, thereby realizing polarization disturbance positioning.

7. The polarization state disturbance positioning method based on a two-way synaesthesia integrated system according to claim 6, characterized in that: The digital signal processing algorithm is specifically: For the first and second polarized light signals, the distance difference between the forward frame header and the reverse frame header and the disturbance point is calculated according to the following formulas: Where x represents the distance between the polarization disturbance point and the frame header in the optical fiber link when the disturbance occurs, L represents the length of the optical fiber link, Δt represents the time difference between the time when the disturbance occurs and the time when the frame header appears, and ΔT represents the time interval between two adjacent frame headers.

8. The polarization state disturbance positioning method based on a two-way synaesthesia integrated system according to claim 7, characterized in that: Calculating the position of the polarization disturbance point using the bidirectional distance difference includes: In forward transmission, when the disturbance occurs, the distance difference between the polarization disturbance point and the forward frame header in the first optical fiber link is In reverse transmission, the distance difference between the polarization disturbance point and the reverse frame header in the second optical fiber link when the disturbance occurs is When polarization disturbance occurs, the distance from the forward frame header to the first transmitting end and the distance from the reverse frame header to the second transmitting end are both ΔL; Construct the following equation: L=x1+x2+2ΔL Solving the equation, we can get the distance from the polarization disturbance point to the first transmitting end as The distance from the polarization perturbation point to the second transmitting end is 9. A polarization state disturbance positioning method based on a two-way synaesthesia integrated system according to any one of claims 6 to 8, characterized in that: The signal processor detects the polarization state change of the optical signal in real time according to Malus's law, specifically: I=I0cos 2 (i F ) Where I is the intensity of the optical signal received by the receiving end; I0 is the intensity of the optical signal emitted by the transmitting end; θ F is the bias state rotation angle.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the signal processor, the steps of the method according to any one of claims 7 to 9 are implemented.

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