Method and system for measuring errors caused by wavelength drift of optical fiber current transformer

Abstract

The present invention discloses a method and system for measuring the error caused by wavelength drift of an optical fiber current transformer, the method comprising: constructing a first mathematical model of half-wave voltage magnitude and wavelength magnitude, and a second mathematical model of Verdet constant and the wavelength magnitude; constructing a third mathematical model of Verdet constant and the half-wave voltage magnitude according to the first mathematical model and the second mathematical model; constructing a fourth mathematical model of output optical signal and the half-wave voltage magnitude, and determining the total influence of wavelength drift on the output optical signal according to the fourth mathematical model. The error of wavelength drift can be effectively compensated, and the measurement performance of the optical fiber current transformer can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of optical fiber current transformers, and in particular relates to a method and system for measuring errors caused by wavelength drift of optical fiber current transformers. Background Art

[0002] The measurement method of fiber-optic current transformer (FOCT) belongs to non-contact measurement. The natural insulation characteristics of the sensing fiber ring greatly improve the overall safety of the equipment. The sensor does not contain electromagnetic induction elements, and the transmission of optical signals will not be interfered by the magnetic field. It has strong anti-magnetic interference ability, thus ensuring the measurement accuracy of the sensor in harsh environments. FOCT adopts optical measurement method, the response speed of photons is extremely fast, the intrinsic frequency is high, and its measurement bandwidth is up to GHz, which can meet the measurement requirements of AC and DC at the same time. At the same time, FOCT usually adopts closed-loop signal detection technology, with a large dynamic range, which can meet the needs of power metering and relay protection at the same time. FOCT has the advantages of small size, light weight, easy transportation and installation, compact structure, etc. Compared with other traditional current sensors, it can save a lot of metal materials such as iron core and reduce the floor space. When measuring current at the same time, you only need to make the optical fiber into a flexible ring and lay it on the object to be measured. The fiber ring can cover all current channels to ensure accurate measurement. It is easy to install and reduces the complexity of manual layout.

[0003] However, FOCT faces the problem of wavelength drift in practical applications, which is mainly caused by parameter instability due to factors such as ambient temperature changes and fiber bending. Wavelength drift affects the performance of FOCT and thus affects the accuracy of measurement. The stability and accuracy of FOCT data output are of great significance to our work. Therefore, finding a method and system to suppress errors caused by wavelength drift is of great significance to improving the stability and measurement accuracy of FOCT, and helps promote the application of FOCT in the field of current detection. Summary of the invention

[0004] The present invention provides a method and system for measuring errors caused by wavelength drift of a fiber optic current transformer, which is used to solve the technical problem that wavelength drift caused by parameter instability due to factors such as ambient temperature changes and fiber bending will affect the performance of FOCT and further affect the measurement accuracy.

[0005] In a first aspect, the present invention provides a method for measuring an error caused by wavelength drift of an optical fiber current transformer, comprising:

[0006] Constructing a first mathematical model of half-wave voltage magnitude and wavelength magnitude, and a second mathematical model of Verdet constant and the wavelength magnitude;

[0007] Constructing a third mathematical model of the Verdet constant and the half-wave voltage according to the first mathematical model and the second mathematical model;

[0008] A fourth mathematical model of the output optical signal and the half-wave voltage is constructed, and the total influence of the wavelength drift on the output optical signal is determined according to the fourth mathematical model, wherein the calculation formula of the output optical signal after being influenced by the wavelength drift is:

[0009] ,

[0010] In the formula, is the output optical signal affected by wavelength drift, is the initial light intensity, is the Faraday phase shift angle, is the Faraday phase shift angle change caused by the change of the Verdet constant after wavelength drift, The phase modulator modulates the phase difference, is the change in the phase difference of the phase modulator due to wavelength drift, for The opposite of is a positive number.

[0011] In a second aspect, the present invention provides a wavelength drift-induced error measurement system for an optical fiber current transformer, comprising:

[0012] A first construction module is configured to construct a first mathematical model of half-wave voltage magnitude and wavelength magnitude, and a second mathematical model of Verdet constant and the wavelength magnitude;

[0013] A second construction module is configured to construct a third mathematical model of the Verdet constant and the half-wave voltage according to the first mathematical model and the second mathematical model;

[0014] A determination module is configured to construct a fourth mathematical model of the output optical signal and the half-wave voltage, and determine the total influence of the wavelength drift on the output optical signal according to the fourth mathematical model, wherein the calculation formula of the output optical signal after being influenced by the wavelength drift is:

[0015] ,

[0016] In the formula, is the output optical signal affected by wavelength drift, is the initial light intensity, is the Faraday phase shift angle, is the Faraday phase shift angle change caused by the change of the Verdet constant after wavelength drift, The phase modulator modulates the phase difference, is the change in the phase difference of the phase modulator due to wavelength drift, for The opposite of is a positive number.

[0017] In a third aspect, an electronic device is provided, comprising: at least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can perform the steps of the method for measuring errors caused by wavelength drift of an optical fiber current transformer according to any embodiment of the present invention.

[0018] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the program instructions are executed by a processor, the processor executes the steps of the method for measuring errors caused by wavelength drift of an optical fiber current transformer according to any embodiment of the present invention.

[0019] The wavelength drift-induced error measurement method and system for optical fiber current transformer of the present application have the following beneficial effects:

[0020] The relationship between the wavelength drift of the fiber optic current transformer and the output size is analyzed through mathematical derivation. The influence of wavelength drift on the output of the optical current transformer is quantitatively analyzed, and the mapping relationship between wavelength-Verdet constant and wavelength-half-wave voltage is explored. The error model of half-wave voltage and Verdet constant during wavelength drift is constructed, and the error value caused by wavelength drift can be obtained. Subsequently, it is convenient for users to adjust the half-wave voltage to realize the error compensation of wavelength drift. In this way, the error of wavelength drift can be effectively compensated and the measurement performance of the fiber optic current transformer can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A flow chart of a method for measuring an error caused by wavelength drift of an optical fiber current transformer provided by an embodiment of the present invention;

[0023] Figure 2 A structural block diagram of a wavelength drift-induced error measurement system for a fiber optic current transformer provided by an embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1 , which shows a flow chart of a method for measuring errors caused by wavelength drift of a fiber optic current transformer of the present application.

[0027] like Figure 1 As shown, the wavelength drift-induced error measurement method for optical fiber current transformer specifically includes the following steps:

[0028] Step S101, constructing a first mathematical model of half-wave voltage and wavelength, and a second mathematical model of Verdet constant and the wavelength.

[0029] In this step, according to the theoretical formula of half-wave voltage and the wavelength dependence of each modulator parameter, a mathematical model of the half-wave voltage of the optical fiber current sensor and the central wavelength of the light source is established, or the corresponding half-wave voltage data is recorded by experimentally changing the wavelength of the light source, and then a polynomial of the two is fitted.

[0030] Specifically, by changing the wavelength of the light source and recording the corresponding half-wave voltage value, a polynomial of the half-wave voltage and the wavelength is fitted using experimental data, and a first mathematical model is constructed according to the polynomial. The expression of the first mathematical model is:

[0031] ,

[0032] In the formula, is the half-wave voltage size corresponding to the wavelength size, is a positive number, is the wavelength size, is the intercept of the half-wave voltage and wavelength fitting curve.

[0033] Furthermore, through theoretical derivation, the half-wave voltage formula can be obtained:

[0034] ,

[0035] In the formula, for The maximum electro-optic coefficient of the crystal, After applying electric field Crystal refractive index, is the overlap integral factor of the electric field and the optical field, is the proportionality coefficient;

[0036] According to the literature:

[0037] ,

[0038] ,

[0039] ,

[0040] After substitution, the half-wave voltage is:

[0041] ,

[0042] In the formula, is the half-wave voltage size.

[0043] Fitting the half-wave voltage shows that the half-wave voltage and wavelength show a good linear function relationship, and the correlation coefficient reaches 0.9984. Combining the experimental data fitting and theoretical derivation can verify each other and prove the linear relationship between the half-wave voltage and the wavelength.

[0044] It should be noted that by analyzing the wavelength dependence of the Verdet constant in the sensing fiber, the Verdet constant can be obtained from the dispersion theory and Sellmeir dispersion formula as follows:

[0045] ,

[0046] In the formula, is the Verdet constant corresponding to the wavelength, is a constant, is the refractive index of the optical fiber, is the wavelength size.

[0047] Fiber Refractive Index With wavelength The change is small, It is approximately a constant, so the Verdet constant is related to the wavelength The Verdet constant is inversely proportional to the square of the wavelength. decreases with the increase of .

[0048] Step S102: constructing a third mathematical model of the Verdet constant and the half-wave voltage according to the first mathematical model and the second mathematical model.

[0049] In this step, the expression of the third mathematical model is:

[0050] ,

[0051] In the formula, is the Verdet constant, is a constant, is the refractive index of the optical fiber, is a positive number, is the intercept of the half-wave voltage and wavelength fitting curve.

[0052] Step S103: construct a fourth mathematical model of the output optical signal and the half-wave voltage, and determine the total impact of the wavelength drift on the output optical signal according to the fourth mathematical model.

[0053] In this step, when the wavelength drifts due to environmental changes, if , is the total wavelength after wavelength drift, is the change in wavelength drift, and the wavelength drift causes the Verdet constant and half-wave voltage to change. From the first mathematical model and the second mathematical model, it can be seen that at this time , , is the half-wave voltage after wavelength drift, is the change of the half-wave voltage due to the wavelength drift. At this time, the output optical signal is:

[0054] ,

[0055] ,

[0056] In the formula, is the change in Faraday phase angle due to wavelength drift, is the number of sensing optical fiber heads, is the measured current value;

[0057] Determined by the second mathematical model and The functional relationship is expressed as:

[0058] ,

[0059] According to the third mathematical model and The first mathematical relationship is expressed as:

[0060] ,

[0061] Phase modulator modulates the phase difference , is the modulation coefficient, is the modulation voltage;

[0062] The phase modulator modulates the phase difference The second mathematical relationship is:

[0063] ,

[0064] Will be The change in modulation phase caused by Indicates that the expression is:

[0065] ,

[0066] In the formula, is the slope of the half-wave voltage and wavelength fitting curve, is the intercept of the half-wave voltage and wavelength fitting curve;

[0067] pass and Substituting the quantitative relationship into the second mathematical relationship, we get The modulation angle caused , the expression is:

[0068] ,

[0069] The calculation formula of the output optical signal affected by wavelength drift is:

[0070] ,

[0071] In the formula, is the output optical signal affected by wavelength drift, is the initial light intensity, is the Faraday phase shift angle, is the Faraday phase shift angle change caused by the change of the Verdet constant after wavelength drift, The phase modulator modulates the phase difference, is the change in the phase difference of the phase modulator due to wavelength drift, for The opposite of is a positive number.

[0072] The increase of half-wave voltage will lead to the decrease of modulation phase, while the modulation phase is originally negative. The change in modulation phase is minus a negative is equivalent to adding a positive value, which can offset and have a certain effect, and both of them are There is a quantitative relationship, and the final adjustment The value of is used to compensate for the wavelength drift.

[0073] In summary, the method of the present application, the relationship between the wavelength drift of the optical fiber current transformer and the output size, quantitatively analyzes the influence of wavelength drift on the output of the optical fiber current transformer through mathematical derivation, explores the mapping relationship between wavelength-Verdet constant and wavelength-half-wave voltage, and constructs a half-wave voltage and Verdet constant error model during wavelength drift. The error value caused by wavelength drift can be obtained, which is convenient for users to adjust the half-wave voltage to achieve error compensation for wavelength drift. In this way, the error of wavelength drift can be effectively compensated and the measurement performance of the optical fiber current transformer can be improved.

[0074] See also Figure 2 , which shows a structural block diagram of a wavelength drift-induced error measurement system for an optical fiber current transformer of the present application.

[0075] like Figure 2 As shown, the wavelength drift-induced error measurement system 200 includes a first building module 210 , a second building module 220 and a determination module 230 .

[0076] The first construction module 210 is configured to construct a first mathematical model of the half-wave voltage and the wavelength, and a second mathematical model of the Verdet constant and the wavelength;

[0077] A second construction module 220 is configured to construct a third mathematical model of the Verdet constant and the half-wave voltage according to the first mathematical model and the second mathematical model;

[0078] The determination module 230 is configured to construct a fourth mathematical model of the output optical signal and the half-wave voltage, and determine the total influence of the wavelength drift on the output optical signal according to the fourth mathematical model, wherein the calculation formula of the output optical signal after being influenced by the wavelength drift is:

[0079] ,

[0080] In the formula, is the output optical signal affected by wavelength drift, is the initial light intensity, is the Faraday phase shift angle, is the Faraday phase shift angle change caused by the change of the Verdet constant after wavelength drift, The phase modulator modulates the phase difference, is the change in the phase difference of the phase modulator due to wavelength drift, for The opposite of is a positive number.

[0081] It should be understood that Figure 2 Modules and references documented in Figure 1Therefore, the operations and features described above for the method and the corresponding technical effects are also applicable to Figure 2 The modules in it will not be described in detail here.

[0082] In some other embodiments, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the program instructions are executed by a processor, the processor is caused to execute the wavelength drift-induced error measurement method for an optical fiber current transformer in any of the above method embodiments;

[0083] As an implementation mode, the computer-readable storage medium of the present invention stores computer-executable instructions, and the computer-executable instructions are configured as follows:

[0084] Constructing a first mathematical model of half-wave voltage magnitude and wavelength magnitude, and a second mathematical model of Verdet constant and the wavelength magnitude;

[0085] Constructing a third mathematical model of the Verdet constant and the half-wave voltage according to the first mathematical model and the second mathematical model;

[0086] A fourth mathematical model of the output optical signal and the half-wave voltage is constructed, and the total influence of the wavelength drift on the output optical signal is determined according to the fourth mathematical model, wherein the calculation formula of the output optical signal after being influenced by the wavelength drift is:

[0087] ,

[0088] In the formula, is the output optical signal affected by wavelength drift, is the initial light intensity, is the Faraday phase shift angle, is the Faraday phase shift angle change caused by the change of the Verdet constant after wavelength drift, The phase modulator modulates the phase difference, is the change in the phase difference of the phase modulator due to wavelength drift, for The opposite of is a positive number.

[0089] The computer-readable storage medium may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created according to the use of the wavelength drift-induced error measurement system for optical fiber current transformers, etc. In addition, the computer-readable storage medium may include a high-speed random access memory, and may also include a memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the computer-readable storage medium may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the wavelength drift-induced error measurement system for optical fiber current transformers via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0090] Figure 3 is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention, such as Figure 3 As shown, the device includes: a processor 310 and a memory 320. The electronic device may also include: an input device 330 and an output device 340. The processor 310, the memory 320, the input device 330 and the output device 340 may be connected via a bus or other means. Figure 3 In the example, the bus connection is used. The memory 320 is the above-mentioned computer-readable storage medium. The processor 310 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions and modules stored in the memory 320, that is, the wavelength drift-induced error measurement method for the optical fiber current transformer of the above-mentioned method embodiment is implemented. The input device 330 can receive input digital or character information, and generate key signal input related to user settings and function control of the wavelength drift-induced error measurement system for the optical fiber current transformer. The output device 340 may include a display device such as a display screen.

[0091] The electronic device can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided by the embodiment of the present invention.

[0092] As an embodiment, the electronic device is applied to a wavelength drift-induced error measurement system for a fiber-optic current transformer, and is used for a client, and includes: at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can:

[0093] Constructing a first mathematical model of half-wave voltage magnitude and wavelength magnitude, and a second mathematical model of Verdet constant and the wavelength magnitude;

[0094] Constructing a third mathematical model of the Verdet constant and the half-wave voltage according to the first mathematical model and the second mathematical model;

[0095] A fourth mathematical model of the output optical signal and the half-wave voltage is constructed, and the total influence of the wavelength drift on the output optical signal is determined according to the fourth mathematical model, wherein the calculation formula of the output optical signal after being influenced by the wavelength drift is:

[0096] ,

[0097] In the formula, is the output optical signal affected by wavelength drift, is the initial light intensity, is the Faraday phase shift angle, is the Faraday phase shift angle change caused by the change of the Verdet constant after wavelength drift, The phase modulator modulates the phase difference, is the change in the phase difference of the phase modulator due to wavelength drift, for The opposite of is a positive number.

[0098] Through the description of the above implementation modes, those skilled in the art can clearly understand that each implementation mode can be implemented by means of software plus a necessary general hardware platform, or of course by hardware. Based on such an understanding, the above technical solution can essentially or in other words be embodied in the form of a software product that contributes to the prior art. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for measuring the error caused by wavelength drift of an optical fiber current transformer, characterized in that: include: Constructing a first mathematical model of half-wave voltage magnitude and wavelength magnitude, and a second mathematical model of Verdet constant and the wavelength magnitude, wherein the first mathematical model of half-wave voltage magnitude and wavelength magnitude comprises: A first mathematical model of the half-wave voltage and the wavelength is constructed according to data polynomial fitting, and the expression of the first mathematical model is: ， In the formula, is the half-wave voltage size corresponding to the wavelength size, is a positive number, is the wavelength size, is the intercept of the half-wave voltage and wavelength fitting curve; The expression of the second mathematical model is: ， In the formula, is the Verdet constant corresponding to the wavelength, is a constant, is the refractive index of the optical fiber, is the wavelength size; According to the first mathematical model and the second mathematical model, a third mathematical model of the Verdet constant and the half-wave voltage is constructed, and the expression of the third mathematical model is: ， In the formula, is the Verdet constant, is a constant, is the refractive index of the optical fiber, is a positive number, is the intercept of the half-wave voltage and wavelength fitting curve; Constructing a fourth mathematical model of the output optical signal and the half-wave voltage, and determining the total influence of the wavelength drift on the output optical signal according to the fourth mathematical model, wherein determining the total influence of the wavelength drift on the output optical signal according to the fourth mathematical model comprises: When the wavelength drifts due to environmental changes, if , is the total wavelength after wavelength drift, is the change in wavelength drift, and the wavelength drift causes the Verdet constant and half-wave voltage to change. From the first mathematical model and the second mathematical model, it can be seen that at this time , , is the Verdet constant after wavelength drift, is the change in the Verdet constant due to wavelength drift, is the half-wave voltage after wavelength drift, is the change of the half-wave voltage due to the wavelength drift. At this time, the output optical signal is: ， ， In the formula, is the change in Faraday phase angle due to wavelength drift, is the number of sensing optical fiber heads, is the measured current value; Determined by the second mathematical model and The functional relationship is expressed as: ， According to the third mathematical model and The first mathematical relationship is expressed as: ， Phase modulator modulates the phase difference , is the modulation coefficient, is the modulation voltage; The phase modulator modulates the phase difference The second mathematical relationship is: ， Will be The change in modulation phase caused by Indicates that the expression is: ， In the formula, is the slope of the half-wave voltage and wavelength fitting curve, is the intercept of the half-wave voltage and wavelength fitting curve; pass and Substituting the quantitative relationship into the second mathematical relationship, we get The modulation angle caused , the expression is: ， The calculation formula of the output optical signal affected by wavelength drift is: ， In the formula, is the output optical signal affected by wavelength drift, is the initial light intensity, is the Faraday phase shift angle, is the Faraday phase shift angle change caused by the change of the Verdet constant after wavelength drift, The phase modulator modulates the phase difference, is the change in the phase difference of the phase modulator due to wavelength drift, for The opposite of , and is a positive number.

2. A wavelength drift-induced error measurement method for optical fiber current transformer according to claim 1, characterized in that: The first mathematical model of the half-wave voltage and the wavelength size constructed by fitting the data polynomial includes: By changing the wavelength of the light source and recording the corresponding half-wave voltage value, a polynomial of the half-wave voltage and the wavelength is fitted using experimental data, and a first mathematical model is constructed based on the polynomial.

3. A wavelength drift-induced error measurement system for optical fiber current transformer, characterized in that: include: The first construction module is configured to construct a first mathematical model of half-wave voltage magnitude and wavelength magnitude, and a second mathematical model of Verdet constant and the wavelength magnitude, wherein the first mathematical model of half-wave voltage magnitude and wavelength magnitude comprises: A first mathematical model of the half-wave voltage and the wavelength is constructed according to data polynomial fitting, and the expression of the first mathematical model is: ， In the formula, is the half-wave voltage size corresponding to the wavelength size, is a positive number, is the wavelength size, is the intercept of the half-wave voltage and wavelength fitting curve; The expression of the second mathematical model is: ， In the formula, is the Verdet constant corresponding to the wavelength, is a constant, is the refractive index of the optical fiber, is the wavelength size; The second construction module is configured to construct a third mathematical model of the Verdet constant and the half-wave voltage according to the first mathematical model and the second mathematical model, wherein the expression of the third mathematical model is: ， In the formula, is the Verdet constant, is a constant, is the refractive index of the optical fiber, is a positive number, is the intercept of the half-wave voltage and wavelength fitting curve; A determination module is configured to construct a fourth mathematical model of the output optical signal and the half-wave voltage, and determine the total influence of the wavelength drift on the output optical signal according to the fourth mathematical model, wherein the total influence of the wavelength drift on the output optical signal according to the fourth mathematical model comprises: When the wavelength drifts due to environmental changes, if , is the total wavelength after wavelength drift, is the change in wavelength drift, and the wavelength drift causes the Verdet constant and half-wave voltage to change. From the first mathematical model and the second mathematical model, it can be seen that at this time , , is the Verdet constant after wavelength drift, is the change in the Verdet constant due to wavelength drift, is the half-wave voltage after wavelength drift, is the change of the half-wave voltage due to the wavelength drift. At this time, the output optical signal is: ， ， In the formula, is the change in Faraday phase angle due to wavelength drift, is the number of sensing optical fiber heads, is the measured current value; Determined by the second mathematical model and The functional relationship is expressed as: ， According to the third mathematical model and The first mathematical relationship is expressed as: ， Phase modulator modulates the phase difference , is the modulation coefficient, is the modulation voltage; The phase modulator modulates the phase difference The second mathematical relationship is: ， Will be The change in modulation phase caused by Indicates that the expression is: ， In the formula, is the slope of the half-wave voltage and wavelength fitting curve, is the intercept of the half-wave voltage and wavelength fitting curve; pass and Substituting the quantitative relationship into the second mathematical relationship, we get The modulation angle caused , the expression is: ， The calculation formula of the output optical signal affected by wavelength drift is: ， In the formula, is the output optical signal affected by wavelength drift, is the initial light intensity, is the Faraday phase shift angle, is the Faraday phase shift angle change caused by the change of the Verdet constant after wavelength drift, The phase modulator modulates the phase difference, is the change in the phase difference of the phase modulator due to wavelength drift, for The opposite of , and is a positive number.

4. An electronic device, characterized in that: include: At least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method described in any one of claims 1 to 2.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 2 is implemented.

Images