A dual-fiber bidirectional asymmetric optical fiber timing method and device

Abstract

The present invention discloses a dual-fiber bidirectional asymmetric optical fiber timing method and device, which relate to the technical field of time synchronization. A master station device / slave station device simultaneously modulates and sends two optical signals of different wavelengths, combines the two optical signals of different wavelengths to obtain a single optical signal, and then transmits the signal through an optical fiber. The slave station device / master station device then performs wavelength division processing on the received single optical signal to obtain two optical signals of different wavelengths. The dispersion, wavelength, and arrival time of the two optical signals of different wavelengths at the slave station device / master station device are obtained to assist the slave station device / master station device in performing high-precision delay compensation calculation, thereby improving the accuracy of dispersion delay measurement and ultimately achieving high-precision dual-fiber bidirectional asymmetric optical fiber timing.

Description

Technical Field

[0001] The present invention relates to the technical field of time synchronization, and in particular to a dual-fiber bidirectional asymmetric optical fiber timing method and device. Background Art

[0002] Fiber-optic timing technology often uses an exclusive optical fiber method. In this case, single-fiber bidirectional transmission does not need to consider the issue of fiber asymmetry. However, the existing fiber-optic transmission network is dual-fiber bidirectional. Generally, the round-trip optical fibers are of unequal lengths, that is, the round-trip optical fibers are asymmetric. Since the optical transmission network is equipped with amplifiers, ODTR technology cannot be used to measure the length of a single-pass optical fiber. Instead, it uses the characteristic that optical fiber dispersion changes with distance. By measuring the difference ΔD in the dispersion values ​​of two or more wavelengths after passing through an optical fiber of length L, the fiber length can be calculated. In the invention patent application number CN201610270697.3, entitled "Method for Measuring Transmission Delay of Asymmetric Fiber Links," a method for measuring transmission delay of asymmetric fiber links using dispersion effects is described in detail. However, this method has the following problems: 1) Before synchronization, the master and slave devices have different time bases. Therefore, the time difference caused by dispersion cannot be directly calculated by subtracting the slave time from the master time. 2) Dispersion is measured in nanoseconds, while the dispersion difference is on the order of picoseconds. Conventional clocks, such as high-precision crystal oscillators, drift very quickly, so the measurement process cannot be too long. The above-mentioned patent uses a method of first sending a fiber signal with a preset wavelength for measurement, and then sending a fiber signal with a different wavelength for measurement. The time in between often causes clock drift to affect the dispersion time measurement. 3) The use of IEEE1588v2 technology to measure dispersion is impractical because the typical timing error of IEEE 1588v2 is tens of nanoseconds, far exceeding the dispersion value.

[0003] Therefore, in view of the shortcomings of the existing technology, a dual-fiber bidirectional asymmetric optical fiber timing method and device are urgently needed to solve them. Summary of the Invention

[0004] To address the deficiencies of the prior art, the present invention provides a dual-fiber bidirectional asymmetric optical fiber timing method, comprising:

[0005] Use the first method to calculate the uplink optical fiber length from the master device to the slave device:

[0006] The signal source in the master station device generates a first pulse-per-second electrical signal, which is modulated into two optical signals after electro-optical conversion. The two optical signals have different wavelengths and are respectively recorded as a first optical signal and a second optical signal;

[0007] The two optical signals are combined to obtain an optical signal, which is input into an optical fiber for transmission to the slave station device; the slave station device receives the optical signal transmitted from the optical fiber and performs wavelength demultiplexing to obtain the first optical signal and the second optical signal; the first optical signal is subjected to photoelectric conversion to obtain a first electrical signal; the second optical signal is subjected to photoelectric conversion to obtain a second electrical signal; the first electrical signal and the second electrical signal are input into a high-precision TIC, and a corresponding first time delay is output;

[0008] Acquire the wavelength and dispersion of the first optical signal to obtain a first acquisition result; acquire the wavelength and dispersion of the second optical signal to obtain a second acquisition result;

[0009] Calculate the uplink optical fiber length from the master station device to the slave station device based on the first acquisition result, the second acquisition result, and the first time delay;

[0010] Based on the first method, calculating the downlink optical fiber length from the master station device to the slave station device;

[0011] Calculate the total uplink and downlink optical fiber lengths between the master station device and the slave station device using a preset technology;

[0012] Based on the uplink optical fiber length, the downlink optical fiber length, and the total uplink and downlink optical fiber length from the master station device to the slave station device, the uplink optical fiber length is adjusted using a first preset formula, and the adjusted uplink optical fiber length is calculated using a second preset formula to obtain a first calculation result; the downlink optical fiber length is adjusted using a third preset formula, and the adjusted downlink optical fiber length is calculated using a fourth preset formula to obtain a second calculation result;

[0013] Based on the first calculation result and the second calculation result, bidirectional optical fiber timing is implemented from the master station device to the slave station device.

[0014] The present invention is achieved through the following technical solutions:

[0015] First, a pulse-per-second electrical signal is generated by a signal source in the master station device. The electrical signal is converted from electrical to optical and then modulated into two optical signals with different wavelengths, respectively referred to as the first optical signal and the second optical signal. The two optical signals are combined to obtain one optical signal, which is input into an optical fiber and transmitted to the slave station device. The slave station device receives the optical signal and performs wavelength demultiplexing to obtain the first optical signal and the second optical signal.

[0016] Obtain the dispersion, wavelength, and time delay of the two optical signals reaching the slave device. Then, calculate the fiber lengths of the first optical signal transmitted from the master device to the slave device, and the second optical signal transmitted from the master device to the slave device. Combine these two fiber lengths to obtain the upstream fiber length between the master device and the slave device. Using the same method, calculate the downstream fiber length between the master device and the slave device.

[0017] Then, a preset technology (ODTR technology) is used to calculate the total uplink and downlink optical fiber length between the master station device and the slave station device. The uplink optical fiber length and the downlink optical fiber length are calibrated and adjusted based on the total uplink and downlink optical fiber length between the master station device and the slave station device, thereby improving the accuracy of the uplink and downlink optical fiber lengths.

[0018] Finally, the calibrated uplink and downlink optical fiber lengths are used to calculate the delay compensation between the master and slave devices, thereby achieving bidirectional asymmetric optical fiber timing from the master to the slave devices.

[0019] As an optional technical solution, based on the first method, calculating the downlink optical fiber length from the master station device to the slave station device includes:

[0020] The signal source in the slave device generates a second pulse-per-second electrical signal, which is modulated into two optical signals after electro-optical conversion. The two optical signals have different wavelengths and are respectively recorded as a third optical signal and a fourth optical signal;

[0021] The two optical signals are combined to obtain an optical signal, which is input into an optical fiber for transmission to the master station device; the master station device receives the optical signal transmitted from the optical fiber and performs wavelength demultiplexing to obtain the third optical signal and the fourth optical signal, performs photoelectric conversion on the second optical signal to obtain a second electrical signal, inputs the first electrical signal and the second electrical signal into a high-precision TIC, and outputs a corresponding second time delay;

[0022] Acquire the wavelength and dispersion of the third optical signal to obtain a third acquisition result; acquire the wavelength and dispersion of the fourth optical signal to obtain a fourth acquisition result;

[0023] Based on the third acquisition result, the fourth acquisition result and the second time delay, the downlink optical fiber length from the master station device to the slave station device is calculated.

[0024] As an optional technical solution, based on the first acquisition result and the second acquisition result, calculating the uplink optical fiber length from the master station device to the slave station device includes:

[0025] Based on the first acquisition result, calculating using a first formula includes:

[0026] T S1 =D1×L d ×λ1

[0027] T S1 is the moment when the first optical signal arrives at the slave device, D1 is the dispersion of the first optical signal, and λ1 is the wavelength of the first optical signal;

[0028] Based on the second acquisition result, calculating using the second formula includes:

[0029] T S2 =D2×L d ×λ2

[0030] T S2 is the moment when the second optical signal arrives at the slave device, D2 is the dispersion of the second optical signal, and λ2 is the wavelength of the second optical signal;

[0031] Combining the first formula and the second formula to perform calculation includes:

[0032]

[0033] L d The length of the uplink optical fiber from the master station to the slave station (T S2 ―T S1 ) is the first time delay of the high-precision TIC output.

[0034] As an optional technical solution, based on the third acquisition result and the fourth acquisition result, calculating the downlink optical fiber length from the master station device to the slave station device includes:

[0035] Based on the third acquisition result, calculating using a third formula includes:

[0036] T m1 =D3×L u ×λ3

[0037] T m1 is the time when the third optical signal arrives at the master station device, D3 is the dispersion of the third optical signal, and λ3 is the wavelength of the third optical signal;

[0038] Based on the fourth acquisition result, the fourth formula is used to calculate:

[0039] T m2 =D4×L u ×λ4

[0040] T m2 is the time when the fourth optical signal arrives at the master station device, D4 ​​is the dispersion of the second optical signal, and λ4 is the wavelength of the fourth optical signal;

[0041] Combining the third formula and the fourth formula to perform calculations includes:

[0042]

[0043] L u The length of the downlink optical fiber from the master station to the slave station (T m2 ―T m1 ) Second time delay of high-precision TIC output.

[0044] As an optional technical solution, the first preset formula includes:

[0045]

[0046] L t The total length of the upstream and downstream optical fibers between the master and slave devices, L' d The adjusted uplink optical fiber length from the master device to the slave device;

[0047] The third preset formula includes:

[0048]

[0049] L′ u The adjusted downlink optical fiber length from the master device to the slave device.

[0050] As an optional technical solution, the second preset formula includes:

[0051]

[0052] ΔT s The delay compensation amount for sending signals from the master device to the slave device, n is the refractive index of the signal in the optical fiber, and c is the speed of light;

[0053] The fourth preset formula includes:

[0054]

[0055] ΔT m The delay compensation amount for sending signals from the slave device to the master device;

[0056] Based on the ΔT s and the ΔT m , realizing bidirectional optical fiber timing from the master station device to the slave station device.

[0057] As an optional technical solution, the preset technology is ODTR technology.

[0058] In order to address the deficiencies of the above-mentioned prior art, the present invention provides a dual-fiber bidirectional asymmetric optical fiber timing device, comprising a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the computer program, the steps of the dual-fiber bidirectional asymmetric optical fiber timing method are implemented.

[0059] One or more technical solutions provided by the present invention have at least the following technical effects or advantages:

[0060] The present invention discloses a dual-fiber bidirectional asymmetric optical fiber timing method. A master station device / slave station device simultaneously modulates and sends two optical signals of different wavelengths, combines the two optical signals of different wavelengths to obtain a single optical signal, and then transmits the signal through an optical fiber. The slave station device / master station device then performs wavelength division processing on the received single optical signal to obtain two optical signals of different wavelengths. The dispersion, wavelength, and time delay of the two optical signals of different wavelengths arriving at the slave station device / master station device are obtained to assist the slave station device / master station device in performing high-precision delay compensation calculation, thereby improving the accuracy of dispersion delay measurement and ultimately achieving high-precision dual-fiber bidirectional asymmetric optical fiber timing. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of the present invention, and do not constitute a limitation of the embodiments of the present invention;

[0062] Figure 1 This is a schematic diagram of a dual-fiber bidirectional asymmetric optical fiber timing method in the present invention;

[0063] 201-Signal source, 202-Electrical / optical converter, 203-Combiner, 204-Wavelength splitter, 205-Optical / electrical converter, 206-High-precision TIC. DETAILED DESCRIPTION

[0064] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features therein can be combined with each other without conflict.

[0065] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0066] Example 1

[0067] Please refer to Figure 1 , Figure 1The present invention is a schematic flow chart of a dual-fiber bidirectional asymmetric optical fiber timing method, comprising:

[0068] Use the first method to calculate the uplink optical fiber length from the master device to the slave device:

[0069] The signal source in the master station device generates a first pulse-per-second electrical signal, which is modulated into two optical signals after electro-optical conversion. The two optical signals have different wavelengths and are respectively recorded as a first optical signal and a second optical signal;

[0070] The two optical signals are combined to obtain an optical signal, which is input into an optical fiber for transmission to the slave station device; the slave station device receives the optical signal transmitted from the optical fiber and performs wavelength demultiplexing to obtain the first optical signal and the second optical signal; the first optical signal is subjected to photoelectric conversion to obtain a first electrical signal; the second optical signal is subjected to photoelectric conversion to obtain a second electrical signal; the first electrical signal and the second electrical signal are input into a high-precision TIC, and a corresponding first time delay is output;

[0071] Acquire the wavelength and dispersion of the first optical signal to obtain a first acquisition result; acquire the wavelength and dispersion of the second optical signal to obtain a second acquisition result;

[0072] Calculate the uplink optical fiber length from the master station device to the slave station device based on the first acquisition result, the second acquisition result, and the first time delay;

[0073] Based on the first method, calculating the downlink optical fiber length from the master station device to the slave station device;

[0074] Calculate the total uplink and downlink optical fiber lengths between the master station device and the slave station device using a preset technology;

[0075] Based on the uplink optical fiber length, the downlink optical fiber length, and the total uplink and downlink optical fiber length from the master station device to the slave station device, the uplink optical fiber length is adjusted using a first preset formula, and the adjusted uplink optical fiber length is calculated using a second preset formula to obtain a first calculation result; the downlink optical fiber length is adjusted using a third preset formula, and the adjusted downlink optical fiber length is calculated using a fourth preset formula to obtain a second calculation result;

[0076] Based on the first calculation result and the second calculation result, bidirectional optical fiber timing is implemented from the master station device to the slave station device.

[0077] Furthermore, based on the first method, calculating the downlink optical fiber length from the master station device to the slave station device includes:

[0078] The signal source in the slave device generates a second pulse-per-second electrical signal, which is modulated into two optical signals after electro-optical conversion. The two optical signals have different wavelengths and are respectively recorded as a third optical signal and a fourth optical signal;

[0079] The two optical signals are combined to obtain an optical signal, which is input into an optical fiber for transmission to the master station device; the master station device receives the optical signal transmitted from the optical fiber and performs wavelength demultiplexing to obtain the third optical signal and the fourth optical signal, performs photoelectric conversion on the second optical signal to obtain a second electrical signal, inputs the first electrical signal and the second electrical signal into a high-precision TIC, and outputs a corresponding second time delay;

[0080] Acquire the wavelength and dispersion of the third optical signal to obtain a third acquisition result; acquire the wavelength and dispersion of the fourth optical signal to obtain a fourth acquisition result;

[0081] Based on the third acquisition result, the fourth acquisition result and the second time delay, the downlink optical fiber length from the master station device to the slave station device is calculated.

[0082] Furthermore, based on the first acquisition result and the second acquisition result, calculating the uplink optical fiber length from the master station device to the slave station device includes:

[0083] Based on the first acquisition result, calculating using a first formula includes:

[0084] T S1 =D1×L d ×λ1

[0085] T S1 is the moment when the first optical signal arrives at the slave device, D1 is the dispersion of the first optical signal, and λ1 is the wavelength of the first optical signal;

[0086] Based on the second acquisition result, calculating using the second formula includes:

[0087] T S2 =D2×L d ×λ2

[0088] T S2 is the moment when the second optical signal arrives at the slave device, D2 is the dispersion of the second optical signal, and λ2 is the wavelength of the second optical signal;

[0089] Combining the first formula and the second formula to perform calculation includes:

[0090]

[0091] L dThe length of the uplink optical fiber from the master station to the slave station (T S2 ―T S1 ) is the first time delay of the high-precision TIC output.

[0092] Furthermore, based on the third acquisition result and the fourth acquisition result, calculating the downlink optical fiber length from the master station device to the slave station device includes:

[0093] Based on the third acquisition result, calculating using a third formula includes:

[0094] T m1 =D3×L u ×λ3

[0095] T m1 is the time when the third optical signal arrives at the master station device, D3 is the dispersion of the third optical signal, and λ3 is the wavelength of the third optical signal;

[0096] Based on the fourth acquisition result, the fourth formula is used to calculate:

[0097] T m2 =D4×L u ×λ4

[0098] T m2 is the time when the fourth optical signal arrives at the master station device, D4 ​​is the dispersion of the second optical signal, and λ4 is the wavelength of the fourth optical signal;

[0099] Combining the third formula and the fourth formula to perform calculations includes:

[0100]

[0101] L u The length of the downlink optical fiber from the master station to the slave station (T m2 ―T m1 ) is the second time delay of the high-precision TIC output.

[0102] Furthermore, the first preset formula includes:

[0103]

[0104] L t The total length of the upstream and downstream optical fibers between the master and slave devices, L' d The adjusted uplink optical fiber length from the master device to the slave device;

[0105] The third preset formula includes:

[0106]

[0107] L′u The adjusted downlink optical fiber length from the master device to the slave device.

[0108] Furthermore, the second preset formula includes:

[0109]

[0110] ΔT s The delay compensation amount for sending signals from the master device to the slave device, n is the refractive index of the signal in the optical fiber, and c is the speed of light;

[0111] The fourth preset formula includes:

[0112]

[0113] ΔT m The delay compensation amount for sending signals from the slave device to the master device;

[0114] Based on the ΔT s and the ΔT m , realizing bidirectional optical fiber timing from the master station device to the slave station device.

[0115] Furthermore, the preset technology is ODTR technology.

[0116] The specific embodiments of the present invention are as follows:

[0117] The signal source 201 in the master station generates a pulse-per-second signal. Two electro-optical converters 202 modulate the pulse-per-second signal into optical signals with wavelengths λ1 and λ2, respectively. The two optical signals are combined by a combiner 203 to produce a single optical signal, which is then input into an optical fiber for transmission. After receiving the optical signal, the slave station demultiplexes it by a demultiplexer 204 to produce optical signals with wavelengths λ1 and λ2. Due to chromatic dispersion, the electrical signals carried by the optical signals λ1 and λ2 are already delayed. The two optical signals with wavelengths λ1 and λ2 are then photoelectrically converted by an electro-optical converter 205 to produce first and second electrical signals. These signals are then fed into a high-precision time interval counter (TIC) for precise time delay measurement. Since the first and second electrical signals are generated simultaneously at the master station, their delay is zero at the master station. Therefore, the high-precision TIC can directly read the time delay of the first and second electrical signals.

[0118] The time when the first optical signal arrives at the slave device is T S1 , the wavelength is λ1, the dispersion is D1, then we have:

[0119] T S1=D1×L d ×λ1

[0120] The time when the second optical signal arrives at the slave device is T S2 , the wavelength is λ2, the dispersion is D2, then:

[0121] T S2 =D2×L d ×λ2

[0122] Thus T S2 ―T S1 =L d ×(D2λ2―D1λ1), which is:

[0123]

[0124] Among them, (T S2 ―T S1 ) can be accurately read out by high-precision TIC, and the wavelength and dispersion of the first optical signal and the second optical signal can be obtained by measurement, so the uplink optical fiber length from the master station device to the slave station device can be calculated;

[0125] Similarly, the time when the third optical signal arrives at the master station device is T m1 , the wavelength is λ3, the dispersion is D3, then we have:

[0126] T m1 =D3×L u ×λ3

[0127] The time when the fourth optical signal arrives at the master station device is T m2 , the wavelength is λ4, the dispersion is D4, then:

[0128] T m2 =D4×L u ×λ4

[0129] Thus (T m2 ―T m1 )=L u ×(D4λ4―D3λ3), which is:

[0130]

[0131] Among them, (T m2 ―T m1 ) can be accurately read out by high-precision TIC, and the wavelength and dispersion of the third optical signal and the fourth optical signal can be obtained by measurement, so the downlink optical fiber length from the master station device to the slave station device can be calculated.

[0132] Use ODTR (Optical Time Domain Reflectometry) technology to calculate the total length of the upstream and downstream optical fibers between the master station and the slave station, which is recorded as Lt , and then use the following formula to improve the accuracy of the upstream fiber length and the downstream fiber length, including:

[0133]

[0134] L′ d The adjusted uplink optical fiber length from the master device to the slave device;

[0135]

[0136] L′ u The adjusted downlink optical fiber length from the master device to the slave device.

[0137] When L′ is obtained d or L′ u Then, the delay compensation amount is calculated using the following formula, including:

[0138]

[0139] ΔT s The delay compensation amount for sending signals from the master device to the slave device, n is the refractive index of the signal in the optical fiber, and c is the speed of light;

[0140]

[0141] ΔT m The delay compensation amount for the slave device to send signals to the master device.

[0142] Finally, the delay compensation amount calculated by the above formula is used to perform delay compensation, thereby achieving high-precision dual-fiber bidirectional asymmetric optical fiber timing.

[0143] Example 2

[0144] This embodiment provides a dual-fiber bidirectional asymmetric optical fiber timing device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the dual-fiber bidirectional asymmetric optical fiber timing method are implemented.

[0145] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0146] The memory can be used to store the computer program and / or module, and the processor realizes the various functions of the dual-fiber bidirectional asymmetric optical fiber timing device of the invention by running or executing the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function (such as a sound playback function, an image playback function, etc.). In addition, the memory can include a high-speed random access memory and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card, a secure digital card, a flash memory card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0147] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0148] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A dual-fiber bidirectional asymmetric optical fiber timing method, characterized in that: include: Use the first method to calculate the uplink optical fiber length from the master device to the slave device: The signal source in the master station device generates a first pulse-per-second electrical signal, which is modulated into two optical signals after electro-optical conversion. The two optical signals have different wavelengths and are respectively recorded as a first optical signal and a second optical signal; Combining the two optical signals to obtain an optical signal which is input into an optical fiber and then transmitted to the slave station device; The slave station device receives an optical signal transmitted from an optical fiber and performs wavelength demultiplexing processing to obtain the first optical signal and the second optical signal, performs photoelectric conversion on the first optical signal to obtain a first electrical signal, performs photoelectric conversion on the second optical signal to obtain a second electrical signal, inputs the first electrical signal and the second electrical signal into a high-precision TIC, and outputs a corresponding first time delay; Acquire the wavelength and dispersion of the first optical signal to obtain a first acquisition result; acquire the wavelength and dispersion of the second optical signal to obtain a second acquisition result; Calculate the uplink optical fiber length from the master station device to the slave station device based on the first acquisition result, the second acquisition result, and the first time delay; Based on the first method, calculating the downlink optical fiber length from the master station device to the slave station device; Calculating the total uplink and downlink optical fiber lengths between the master station device and the slave station device using a preset technology, wherein the preset technology is OTDR technology; Based on the uplink optical fiber length, the downlink optical fiber length, and the total uplink and downlink optical fiber length from the master station device to the slave station device, the uplink optical fiber length is adjusted using a first preset formula, and the adjusted uplink optical fiber length is calculated using a second preset formula to obtain a first calculation result; The downlink optical fiber length is adjusted using a third preset formula, and the adjusted downlink optical fiber length is calculated using a fourth preset formula to obtain a second calculation result; Based on the first calculation result and the second calculation result, bidirectional optical fiber timing is implemented from the master station device to the slave station device.

2. A dual-fiber bidirectional asymmetric optical fiber timing method according to claim 1, characterized in that: Based on the first method, calculating the downlink optical fiber length from the master station device to the slave station device includes: The signal source in the slave device generates a second pulse-per-second electrical signal, which is modulated into two optical signals after electro-optical conversion. The two optical signals have different wavelengths and are respectively recorded as a third optical signal and a fourth optical signal; The two optical signals are combined to obtain an optical signal, which is input into an optical fiber for transmission to the master station device; the master station device receives the optical signal transmitted from the optical fiber and performs wavelength demultiplexing to obtain the third optical signal and the fourth optical signal, performs photoelectric conversion on the second optical signal to obtain a second electrical signal, inputs the first electrical signal and the second electrical signal into a high-precision TIC, and outputs a corresponding second time delay; Acquire the wavelength and dispersion of the third optical signal to obtain a third acquisition result; acquire the wavelength and dispersion of the fourth optical signal to obtain a fourth acquisition result; Based on the third acquisition result, the fourth acquisition result and the second time delay, the downlink optical fiber length from the master station device to the slave station device is calculated.

3. A dual-fiber bidirectional asymmetric optical fiber timing method according to claim 2, characterized in that: Calculating the uplink optical fiber length from the master station device to the slave station device based on the first acquisition result and the second acquisition result includes: Based on the first acquisition result, calculating using a first formula includes: is the time when the first optical signal arrives at the slave device, is the dispersion of the first optical signal, is the wavelength of the first optical signal; Based on the second acquisition result, calculating using the second formula includes: is the moment when the second optical signal arrives at the slave device, is the dispersion of the second optical signal, is the wavelength of the second optical signal; Combining the first formula and the second formula to perform calculation includes: The length of the uplink optical fiber from the master station to the slave station. This is the first time delay of the high-precision TIC output.

4. A dual-fiber bidirectional asymmetric optical fiber timing method according to claim 3, characterized in that: Calculating the downlink optical fiber length from the master station device to the slave station device based on the third acquisition result and the fourth acquisition result includes: Based on the third acquisition result, calculating using a third formula includes: is the time when the third optical signal arrives at the master station device, is the dispersion of the third optical signal, is the wavelength of the third optical signal; Based on the fourth acquisition result, the fourth formula is used to calculate: is the moment when the fourth optical signal arrives at the master station device, is the dispersion of the second optical signal, is the wavelength of the fourth optical signal; Combining the third formula and the fourth formula to perform calculations includes: The length of the downlink optical fiber from the master station to the slave station. Second time delay for high-precision TIC output.

5. A dual-fiber bidirectional asymmetric optical fiber timing method according to claim 4, characterized in that: The first preset formula includes: The total length of the upstream and downstream optical fibers between the master station equipment and the slave station equipment. The adjusted uplink optical fiber length from the master device to the slave device; The third preset formula includes: The adjusted downlink optical fiber length from the master device to the slave device.

6. A dual-fiber bidirectional asymmetric optical fiber timing method according to claim 5, characterized in that: The second preset formula includes: The delay compensation amount for sending signals from the master device to the slave device, is the refractive index of the signal in the optical fiber, is the speed of light; The fourth preset formula includes: The delay compensation amount for sending signals from the slave device to the master device; Based on the and the aforementioned , realizing bidirectional optical fiber timing from the master station device to the slave station device.

7. A dual-fiber bidirectional asymmetric optical fiber timing device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the dual-fiber bidirectional asymmetric optical fiber timing method as described in any one of claims 1 to 6 are implemented.

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