Double-fiber bidirectional asymmetric optical fiber time service method and device

Abstract

The invention discloses a double-fiber bidirectional asymmetric optical fiber time service method and device, and relates to the technical field of time synchronization, two optical signals with different wavelengths are modulated and sent at the same time through master station equipment / slave station equipment, the two optical signals with different wavelengths are combined to obtain a single-path optical signal, and then the single-path optical signal is transmitted through an optical fiber. The slave station device / master station device carries out wave division processing on the received single-path optical signal to obtain two optical signals with different wavelengths, and the dispersion and the wavelength of the two optical signals with different wavelengths and the time of reaching the slave station device / master station device are obtained to assist the slave station device / master station device to carry out high-precision time delay compensation amount calculation; therefore, the precision of dispersion delay measurement is improved, and finally high-precision double-fiber bidirectional asymmetric optical fiber time service is realized.

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 the method of exclusive optical fiber. In this case, single-fiber bidirectional does not need to consider the problem of optical fiber asymmetry. However, the existing optical fiber transmission network is dual-fiber bidirectional. Generally, the optical fibers in the round trip are of unequal lengths, that is, the optical fibers in the round trip are asymmetric. Since amplifiers are installed in the optical transmission network, ODTR technology cannot be used to measure the length of a single-trip 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 with a length of L, the length of the optical fiber can be calculated. In the invention patent with application number CN201610270697.3 and titled Method for Measuring Transmission Delay of Asymmetric Fiber Link, a method for measuring transmission delay of asymmetric fiber link using dispersion effect is described in detail. However, the method has the following problems: 1) First, the time bases of the master station device and the slave station device are different before synchronization. Therefore, the time of the master station cannot be directly subtracted from the time of the slave station to calculate the time difference caused by dispersion; 2) Dispersion is measured in nanoseconds, while the dispersion difference is in the order of picoseconds. Ordinary clocks such as high-precision crystal oscillators drift very quickly, so the measurement process cannot be too long. The above 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 from the preset wavelength for measurement. The time in between often causes clock drift to affect the measurement of dispersion time; 3) The IEEE1588v2 technology is used to measure dispersion, which is not practical because the typical timing error of IEEE 1588v2 is tens of nanoseconds, which far exceeds 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] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a dual-fiber bidirectional asymmetric optical fiber timing method, comprising:

[0005] The first method is used to calculate the uplink optical fiber length from the master station to the slave station:

[0006] The signal source in the master station device generates a first second pulse 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 an optical signal transmitted from the optical fiber and performs a wavelength division process to obtain the first optical signal and the second optical signal, the first optical signal is subjected to a photoelectric conversion to obtain a first electrical signal, the second optical signal is subjected to a 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] Based on the first acquisition result, the second acquisition result and the first time delay, calculate the uplink optical fiber length from the master station device to the slave station device;

[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 second pulse electrical signal is generated by a signal source in the master station device, and the electrical signal is modulated into two optical signals after electrical-optical conversion, and the wavelengths of the two optical signals are different, which are respectively recorded as the first optical signal and the second optical signal; the two optical signals are combined to obtain an optical signal, which is input into the optical fiber for transmission to the slave station device, and the slave station device receives the optical signal and performs wavelength separation processing to obtain the first optical signal and the second optical signal;

[0016] Obtain the dispersion, wavelength and time delay of the two optical signals to the slave device, and then calculate the optical fiber length of the first optical signal transmitted from the master device to the slave device, and the optical fiber length of the second optical signal transmitted from the master device to the slave device, respectively, and perform joint processing on the above two optical fiber lengths to obtain the uplink optical fiber length between the master device and the slave device; based on the same method, calculate the downlink optical fiber length between the master device and the slave device;

[0017] Then, the preset technology (ODTR technology) is used to calculate the total uplink and downlink optical fiber lengths 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 through the total uplink and downlink optical fiber lengths between the master station device and the slave station device to improve the accuracy of the uplink optical fiber length and the downlink optical fiber length;

[0018] Finally, the calibrated uplink optical fiber length and downlink optical fiber length are used to calculate the delay compensation between the master station device and the slave station device, thereby realizing bidirectional asymmetric optical fiber timing from the master station device to the slave station device.

[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 station device generates a second pulse electrical signal, and the second pulse electrical signal 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 an optical signal transmitted from the optical fiber and performs a wavelength division process to obtain the third optical signal and the fourth optical signal, the second optical signal is subjected to a 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 second time delay is output;

[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 time 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 a second formula includes:

[0029] T S2 =D2×L d ×λ2

[0030] T S2 is the time 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, the calculation using the 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, the calculation 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 optical fiber between the master station and the slave station, L′ d The adjusted uplink optical fiber length from the master station equipment to the slave station equipment;

[0047] The third preset formula includes:

[0048]

[0049] L′ u The adjusted downlink optical fiber length from the master station device to the slave station 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 solve the deficiencies of the above-mentioned prior art, the present invention 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, wherein the processor implements the steps of the dual-fiber bidirectional asymmetric optical fiber timing method when executing the computer program.

[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, wherein a master station device / slave station device simultaneously modulates and sends two optical signals of different wavelengths, and the two optical signals of different wavelengths are combined to obtain a single optical signal, which is then transmitted through an optical fiber, and then the slave station device / master station device performs wavelength division processing on the received single optical signal to obtain two optical signals of different wavelengths, and obtains the dispersion, wavelength and time delay of the two optical signals of different wavelengths to reach the slave station device / master station device, so as 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 finally realizing 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 on the embodiments of the present invention;

[0062] Figure 1 It 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-wave combiner, 204-wave splitter, 205-optical / electrical converter, 206-high-precision TIC. DETAILED DESCRIPTION

[0064] In order to more clearly understand the above-mentioned purpose, 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 in the embodiments 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 within the scope of this description. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0066] Embodiment 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] The first method is used to calculate the uplink optical fiber length from the master station to the slave station:

[0069] The signal source in the master station device generates a first second pulse 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 an optical signal transmitted from the optical fiber and performs a wavelength division process to obtain the first optical signal and the second optical signal, the first optical signal is subjected to a photoelectric conversion to obtain a first electrical signal, the second optical signal is subjected to a 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] Based on the first acquisition result, the second acquisition result and the first time delay, calculate the uplink optical fiber length from the master station device to the slave station device;

[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] Further, 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 station device generates a second pulse electrical signal, and the second pulse electrical signal 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 an optical signal transmitted from the optical fiber and performs a wavelength division process to obtain the third optical signal and the fourth optical signal, the second optical signal is subjected to a 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 second time delay is output;

[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] Further, 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 time 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 a second formula includes:

[0087] T S2 =D2×L d ×λ2

[0088] T S2 is the time 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] Further, 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, the calculation using the 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, the calculation 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 optical fiber between the master station and the slave station, L′ d The adjusted uplink optical fiber length from the master station equipment to the slave station equipment;

[0105] The third preset formula includes:

[0106]

[0107] L′u The adjusted downlink optical fiber length from the master station device to the slave station 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 device generates a pulse per second signal, and then modulates the pulse per second signal into an optical signal with a wavelength of λ1 and an optical signal with a wavelength of λ2 through two electrical / optical converters 202, and combines the two optical signals through a combiner 203 to obtain an optical signal and input it into the optical fiber for transmission. After the slave station device receives the optical signal, it splits the optical signal through a splitter 204 to obtain an optical signal with a wavelength of λ1 and an optical signal with a wavelength of λ2. Due to the dispersion effect, the electrical signals carried by the optical signals with wavelengths of λ1 and λ2 have been delayed. Then, the two optical signals with wavelengths of λ1 and λ2 are subjected to photoelectric changes through an optical / electrical converter 205 to obtain a first electrical signal and a second electrical signal, and finally sent to a high-precision TIC (high-speed time interval counter) for accurate measurement of time delay. Since the first electrical signal and the second electrical signal are generated simultaneously in the master station device, their delay in the master station is 0, so the time delay of the first electrical signal and the second electrical signal can be directly read through the high-precision TIC.

[0118] The time when the first optical signal arrives at the slave device is T S1 , wavelength is λ1, 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, and 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 obtained as 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 equipment and the slave station equipment, denoted as Lt , and then use the following formulas 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 station equipment to the slave station equipment;

[0135]

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

[0137] When L′ is obtained d or L′ u After that, the delay compensation amount is calculated by 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] Embodiment 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), or other general-purpose processors, digital signal processors, application-specific integrated circuits, field programmable gate arrays or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. A 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 various functions of the dual-fiber bidirectional asymmetric optical fiber timing device in 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, an application required for at least one 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 devices.

[0147] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other 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 can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A dual-fiber bidirectional asymmetric optical fiber timing method, characterized in that: include: The first method is used to calculate the uplink optical fiber length from the master station to the slave station: The signal source in the master station device generates a first second pulse 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 for transmission to the slave station device; The slave station device receives an optical signal transmitted from an optical fiber and performs wavelength division 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; Based on the first acquisition result, the second acquisition result and the first time delay, calculate the uplink optical fiber length from the master station device to the slave station device; Based on the first method, calculating the downlink optical fiber length from the master station device to the slave station device; Calculate the total uplink and downlink optical fiber lengths between the master station device and the slave station device using a preset 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 station device generates a second pulse electrical signal, and the second pulse electrical signal 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 an optical signal transmitted from the optical fiber and performs a wavelength division process to obtain the third optical signal and the fourth optical signal, the second optical signal is subjected to a 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 second time delay is output; 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: T S1 =D1×L d ×λ1 T S1 is the time 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; Based on the second acquisition result, calculating using a second formula includes: T S2 =D2×L d ×λ2 T S2 is the time 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; Combining the first formula and the second formula to perform calculation includes: 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.

4. A dual-fiber bidirectional asymmetric optical fiber timing method according to claim 3, characterized in that: 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: Based on the third acquisition result, the calculation using the third formula includes: T m1 =D3×L u ×λ3 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; Based on the fourth acquisition result, the fourth formula is used to calculate: T m2 =D4×L u ×λ4 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; Combining the third formula and the fourth formula, the calculation includes: 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.

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

6. A dual-fiber bidirectional asymmetric optical fiber timing method according to claim 5, characterized in that: The second preset formula includes: 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; The fourth preset formula includes: ΔT m The delay compensation amount for sending signals from the slave device to the master device; Based on the ΔT s and the ΔT m , realizing bidirectional optical fiber timing from the master station device to the slave station device.

7. A dual-fiber bidirectional asymmetric optical fiber timing method according to claim 1, characterized in that: The preset technology is ODTR technology.

8. 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 a dual-fiber bidirectional asymmetric optical fiber timing method as described in any one of claims 1-7 are implemented.

Images