CN113346946B - Optical fiber delay change measuring device and measuring method based on microwave photons - Google Patents
Optical fiber delay change measuring device and measuring method based on microwave photons Download PDFInfo
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- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
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Abstract
The invention provides an optical fiber delay change measuring device and a measuring method based on microwave photons, which are characterized in that firstly, an optical frequency comb technology is adopted to obtain a high-frequency optical carrier microwave signal, then transmission delay perception is carried out on an optical fiber to be measured through the optical carrier microwave signal, the optical carrier microwave signal after perception in the optical fiber to be measured and a reference signal are subjected to phase detection by utilizing the microwave photon technology, phase fluctuation of the optical carrier microwave signal can be caused by delay change of the optical fiber to be measured, and therefore measurement of optical fiber delay change can be realized through phase monitoring of the optical carrier microwave signal. The optical fiber delay change is the absolute phase difference of the optical carrier microwave signal divided by the signal frequency, and the higher the frequency of the sensing signal is, the higher the measurement precision is. The invention changes the time domain to the frequency domain for the time delay measurement of the optical fiber, and improves the measurement precision by tens of times compared with a commercial timer.
Description
Technical Field
The invention relates to the technical field of microwave photon time measurement, in particular to the field of optical fiber delay change measurement based on microwave photons.
Background
With the rapid development of optical fiber communication technology, high-precision time synchronization by using optical fibers plays an increasingly important role in the fields of basic scientific research, astronomical observation, national defense construction and the like. However, high precision measurement of the fiber transit time is the basis for high precision time synchronization. Currently, two types of optical fiber delay change measurement are mainly time measurement based on bidirectional transmission and time measurement based on round-trip delay.
First, based on the bidirectional-to-pair optical fiber delay measurement, at two ends of an optical fiber, a time scale signal is firstly divided into two paths through a power divider, one path is used as a trigger input for starting measurement of a local timer, and the other path is subjected to intensity modulation through a local oscillator laser source and then is sent to the optical fiber to be measured to be transmitted to the other end. Meanwhile, the two places respectively demodulate the optical signals transmitted from the other end, and the time scale signals obtained through photoelectric conversion are used as the input signals of the local timer for measuring. And finally, carrying out delay correction on the asymmetry of the transmission paths of the two places to obtain the time difference of the two places so as to obtain the transmission time of the optical fiber. The consistency requirement of the two-end equipment is very high in the mode, so that the same transmission delay of the two ends is ensured, a plurality of auxiliary measuring equipment are additionally added, the complexity of the system is greatly increased, and the practicability of the system is limited.
Secondly, based on the round-trip optical fiber delay measurement, one path of the time scale signal triggers a timer to start measurement, the other path of the time scale signal modulates the local light source in intensity, then the light source is transmitted to a far end through the optical fiber to be measured and then is transmitted back to the local end, and the time scale signal obtained by demodulation is input into the timer to finish time measurement. According to the symmetrical characteristic of optical fiber transmission, half of the value measured by the counter is the transmission time of the optical fiber to be measured.
In the above modes, the transmission delay is detected by using the optical carrier pulse signal, and then the measurement of the optical fiber transmission time is performed on the traditional time domain, however, the measurement accuracy of the current commercial timer can only be in the order of picoseconds or even tens of picoseconds.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an optical fiber delay change measuring device and method based on microwave photons. The optical fiber delay variation is the phase error of the optical carrier microwave signal divided by the signal frequency, so that the delay measurement of the optical fiber is carried out from a time domain to a frequency domain, and the measurement precision is improved by tens of times; and the higher the frequency of the sensing signal is, the higher the measurement precision is, the realization is simple, and the application requirements in the fields of deep space exploration, national defense construction and the like can be met.
The invention provides a measuring device for fiber delay change based on microwave photons, which comprises: the optical frequency comb generating module, the optical carrier microwave up-conversion module, the optical fiber delay sensing module, the phase detecting module and the phase-time conversion module;
the optical frequency comb generating module is used for modulating the optical signals into optical frequency comb signals and dividing the optical frequency comb signals into two paths to form a first path of optical frequency comb signals and a second path of optical frequency comb signals.
And the optical carrier microwave up-conversion module is used for sequentially filtering, up-converting and coupling the first path of optical frequency comb signal to form an optical carrier microwave signal.
The optical fiber delay sensing module transmits the optical carrier microwave signal to an optical fiber to be detected for delay sensing, and then returns the optical carrier microwave signal to the optical carrier microwave up-conversion module through the original path of the Faraday rotator mirror after secondary frequency shift to obtain a return optical carrier microwave signal;
the phase detection module is used for detecting the phase error of the returned optical carrier microwave signal and the second path of optical frequency comb signal to obtain the absolute phase difference of the optical carrier microwave signal caused by the optical fiber delay variation;
and the phase-time conversion module divides the absolute phase difference by the signal frequency to obtain optical fiber delay information.
Preferably, the optical frequency comb generation module comprises a fiber laser, a signal generator, an optical frequency comb generator, a frequency standard source.
Preferably, the optical microwave-loaded up-conversion module comprises an optical coupler, a circulator, a polarization-maintaining array waveguide grating and a first acousto-optic modulator.
Preferably, the optical fiber delay sensing module comprises an optical fiber to be measured, a second acousto-optic modulator and a Faraday polariscope.
Preferably, the phase detection module comprises an optical coupler, a balance detector, a phase detector, a frequency standard source and a phase comparator.
Preferably, the phase-time conversion module comprises a microprocessor.
Preferably, the frequency standard source has three output ports, a first output port is connected to the synchronous port of the signal generator, a second output port is connected to the driving port of the first acousto-optic modulator, and a third output port is connected to the phase comparator.
Preferably, the fiber laser is connected with the optical frequency comb generator, the output of the optical frequency comb generator is divided into two paths by a 1 × 2 optical coupler, one path of signal enters the 2 × 2 optical coupler, the other path of signal is connected with a first port of a circulator, a second port of the circulator is connected with a polarization maintaining array waveguide grating, a first outlet of the polarization maintaining array waveguide grating is connected with a first acousto-optic modulator, the first acousto-optic modulator is connected with the 1 × 2 optical coupler, a second outlet of the polarization maintaining array waveguide grating is connected with another input port of the optical coupler, the optical coupler is coupled and then sent into the fiber to be measured, the fiber is output by the fiber and then connected with a second acousto-optic modulator, and the second optical modulator is connected with a faraday rotation mirror.
Preferably, the third port of the circulator is connected with the other input port of the 2 × 2 coupler, the output port of the 2 × 2 coupler is connected with the balance detector, the balance detector is connected with the phase detector, the phase detector is connected with the phase comparator, and the phase comparator is connected with the microprocessor.
According to another aspect of the present invention, there is provided a method for measuring the delay variation of an optical fiber based on microwave photons, comprising the steps of:
step 1, modulating an optical signal output by an optical fiber laser by an optical frequency comb generator driven by a signal generator to generate an optical frequency comb signal;
step 2, the optical frequency comb signal is divided into two paths by a 1 × 2 optical coupler to form a first optical frequency comb signal and a second optical frequency comb signal, the first optical frequency comb signal enters a port 1 of a circulator, then is output from a port 2 of the circulator to enter a polarization maintaining array waveguide grating, two optical carriers are filtered out after passing through the polarization maintaining array waveguide grating, one carrier is subjected to up-conversion by a first acousto-optic modulator, then is coupled with the other carrier by the 2 × 1 optical coupler to form an optical carrier microwave signal, and then is sent to an optical fiber to be detected for delay sensing;
step 3, transmitting the optical carrier microwave signal to the optical fiber to be detected for time-delay sensing, then carrying out secondary frequency shift by a second acousto-optic modulator, then reflecting by a Faraday optical rotation mirror, then sequentially passing through the second acousto-optic modulator, the optical fiber to be detected, the first acousto-optic modulator and the polarization-preserving array waveguide grating, then entering an opening 2 of a circulator, and finally outputting and returning the optical carrier microwave signal from an opening 3 of the circulator;
step 4, the second optical frequency comb signal is used as a reference signal for phase detection, and the second optical frequency comb signal and the return optical carrier microwave signal are subjected to frequency mixing in a 2 x 2 optical coupler;
step 5, converting the output signal after frequency mixing into an electric signal through a balanced photoelectric detector, generating a phase jitter signal through a phase detector, and performing phase comparison on the generated phase jitter signal and a frequency standard source signal in a phase comparator to obtain an absolute phase difference of the optical carrier microwave signal caused by optical fiber delay variation;
and 6, the phase-time conversion module divides the absolute phase difference obtained by the phase comparator by the transmission frequency to calculate the delay change of the optical fiber.
Preferably, the frequency standard source can output different frequency signals synchronized in phase.
Preferably, the signal generator is a microwave signal generator, and the signal generator is phase-synchronized with the frequency standard source.
Preferably, said first acousto-optic modulator drive signal is provided by a frequency standard source output signal.
Preferably, the phase detector is composed of a band-pass filter and a mixer.
Preferably, the phase comparator has a programmable frequency divider built therein.
According to the device and the method for measuring the optical fiber delay variation based on the microwave photons, the microwave photon technology is utilized to obtain the high-frequency optical carrier microwave signal, then the phase jitter of the signal is caused by the optical fiber delay variation in the transmission process of the optical fiber to be measured by utilizing the optical carrier microwave signal, the phase jitter of the detection signal is utilized to obtain the optical fiber delay variation, the time measurement is converted from the traditional time domain to the frequency domain measurement, and the measurement precision is improved by tens of times.
Compared with the prior art, the invention has the following beneficial effects:
1. by using the optical frequency comb technique to obtain high frequency microwave signals, the use of high frequency signal generators and high frequency electronics is avoided.
2. The optical fiber delay variation is obtained by utilizing the phase jitter information of the optical carrier microwave signal, the time measurement is carried out from the time domain to the frequency domain, the limitation of the resolution ratio of a commercial timer is broken through, and the higher the frequency of the microwave signal is, the higher the measurement precision is.
3. Compared with the traditional intensity modulation-detection method, the coherent mixing phase detection method has higher detection sensitivity;
4. the realization method is simple, does not need the consistency of equipment, and can meet the application requirements of optical fiber time synchronization and optical fiber sensing.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a block diagram of the structure of the device for measuring the delay variation of an optical fiber based on microwave photons;
FIG. 2 is an electrical connection diagram of the optical fiber delay variation measuring device based on microwave photons provided by the present invention;
FIG. 3 is a flow chart of a method for measuring the delay variation of an optical fiber based on microwave photons according to the present invention;
FIG. 4 shows the delay variation of a 1m optical fiber measured using the present invention and a commercial timer.
In the above drawings, the reference numerals have the following meanings:
101-a fiber laser; 102-an optical frequency comb generator; 103-a signal generator;
104-a circulator; 105-polarization maintaining array waveguide grating; 106-a first acousto-optic modulator;
107-a second acousto-optic modulator; 108-a frequency standard source; 109-balanced detector;
110-a phase detector; 111-phase comparator; 112-a microprocessor;
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings:
according to an aspect of the present invention, there is provided a device for measuring a delay variation of an optical fiber based on microwave photons, referring to fig. 1 to 2, where fig. 1 is a block diagram illustrating a structure of the device for measuring a delay variation of an optical fiber based on microwave photons, including: the optical frequency comb generating module, the optical carrier microwave up-conversion module, the optical fiber delay sensing module, the phase detecting module and the phase-time conversion module.
The optical frequency comb generating module is used for modulating the optical signals into optical frequency comb signals and dividing the optical frequency comb signals into two paths to form a first path of optical frequency comb signals and a second path of optical frequency comb signals.
The optical carrier microwave up-conversion module sequentially filters, up-converts and couples the first path of optical frequency comb signals to form optical carrier microwave signals, wherein the optical carrier up-conversion processing can realize the phase detection of subsequent optical heterodyne beat frequency, and homodyne frequency mixing is avoided.
The optical fiber delay sensing module transmits the optical carrier microwave signal to an optical fiber to be detected for delay sensing, then returns the optical carrier microwave signal to the optical carrier microwave up-conversion module through a Faraday rotator original path after secondary frequency shift to obtain a return optical carrier microwave signal, wherein the influence of backward Rayleigh scattering noise can be avoided by secondary frequency shift processing.
And the phase detection module is used for carrying out phase error detection on the returned optical carrier microwave signal and the second path of optical frequency comb signal to obtain the absolute phase difference of the optical carrier microwave signal caused by optical fiber delay change.
In this embodiment, the phase-time conversion module divides the absolute phase difference by a signal frequency to obtain optical fiber delay information.
In this embodiment, the optical frequency comb generating module includes a fiber laser, a signal generator, an optical frequency comb generator, and a frequency standard source.
In this embodiment, the optical microwave-bearing up-conversion module includes an optical coupler, a circulator, a polarization maintaining array waveguide grating, and a first acousto-optic modulator.
In this embodiment, the optical fiber delay sensing module includes an optical fiber to be measured, a second acousto-optic modulator, and a faraday optical rotation mirror.
In this embodiment, the phase detection module includes an optical coupler, a balance detector, a phase detector, a frequency standard source, and a phase comparator.
In this embodiment, the phase-time conversion module includes a microprocessor.
Fig. 2 is an electrical connection diagram of the optical fiber delay variation measuring device based on microwave photons according to the present embodiment, in which an optical fiber laser 101 is connected to an optical frequency comb generator 102, a signal generator 103 is connected to the optical frequency comb generator 102, the output of the optical frequency comb generator 102 is divided into two paths by a 1 × 2 optical coupler, one path of signal enters a 2 × 2 optical coupler, the other path is connected to a first port of a circulator 104, a second port of the circulator 104 is connected to a polarization maintaining array waveguide grating 105, a first outlet of the polarization maintaining array waveguide grating 105 is connected to a first acousto-optic modulator 106, then the first acousto-optic modulator 106 is connected to the 2 × 1 optical coupler, a second outlet of the polarization maintaining array waveguide grating 105 is connected to another input port of the 2 × 1 optical coupler, the 2 × 1 optical coupler is coupled and then fed into an optical fiber to be measured, and the second optical modulator 107 is connected with the second optical modulator 107 after being output by the optical fiber, and the second optical modulator 107 is connected with a Faraday optical rotation mirror.
The third port of the circulator 104 is connected to another input port of the 2 × 2 coupler, the output of the 2 × 2 coupler is connected to the balance detector 109, the balance detector 109 is connected to the phase detector 110, the phase detector 110 is connected to the phase comparator 111, and the phase comparator 111 is connected to the microprocessor 112.
In this embodiment, the frequency standard source 108 has three output ports, a first output port is connected to the synchronous port of the signal generator 103, a second output port is connected to the driving port of the first acousto-optic modulator 106, and a third output port is connected to the phase comparator 111.
In this embodiment, the signal generator 103 may adopt a microwave signal generator, and the phase detector 110 has a function of detecting a photoelectric heterodyne phase and is internally provided with a band-pass filter and a mixer; the frequency standard source 108 has different frequency standard output ports; the phase comparator 111 is internally provided with a programmable frequency divider.
The frequency of the optical frequency comb teeth interval of the present embodiment can be adjusted and is determined by the output frequency of the signal generator. The frequency interval between the two optical carriers can also be selected through different output channels of the arrayed waveguide grating, and the larger the frequency interval (frequency of the optical carrier microwave signal) of the two optical carriers is, the higher the precision of the optical fiber delay change measurement is.
According to another aspect of the present invention, a method for measuring a delay variation of an optical fiber based on microwave photons is provided, and fig. 3 is a flowchart of the method for measuring a delay variation of an optical fiber based on microwave photons according to this embodiment, which specifically includes the following steps:
step 1, generating a local oscillator optical signal by the optical fiber laser 101, and then sending the local oscillator optical signal to the optical frequency comb generator 102 driven by the signal generator 103 to generate an optical frequency comb signal;
further, the signal generator 103 is phase-synchronized with the frequency standard source 108;
step 2, dividing the optical frequency comb signal into two paths by a 1 × 2 optical coupler, enabling the first path of optical frequency comb to enter a polarization maintaining array waveguide grating 105 through a circulator 104, and enabling the second path of optical frequency comb to be used as a reference signal for phase detection and to be coupled with a returned optical carrier microwave signal in the 2 × 2 optical coupler; the first optical comb filters out two optical carriers through the polarization maintaining array waveguide grating 105, wherein one carrier is subjected to up-conversion through the first acousto-optic modulator 106, then is coupled with the other carrier through the 1 x 2 coupler to generate an optical carrier microwave signal, and then is sent into an optical fiber to be detected;
further, the driving circuit of the first acousto-optic modulator is provided by the frequency standard source 108 to ensure the synchronism of the phase.
Step 3, transmitting the optical carrier microwave signal to an optical fiber to be detected for time-delay sensing, then performing secondary frequency shift by the second acousto-optic modulator 107, then reflecting by the Faraday optical rotation mirror, sequentially passing through the second acousto-optic modulator 107, the optical fiber to be detected, the first acousto-optic modulator 106 and the polarization-maintaining array waveguide grating 105, entering the port 2 of the circulator, and finally outputting a return optical carrier microwave signal from the port 3 of the circulator;
step 4, the second optical frequency comb signal is used as a reference signal for phase detection, and the second optical frequency comb signal and the return optical carrier microwave signal are subjected to frequency mixing in a 2 x 2 optical coupler;
step 5, converting the output signal after mixing into an electric signal through a balanced photoelectric detector 109, generating a phase jitter signal through a phase detector 110, sending the phase jitter signal output by the phase detector 110 and the frequency reference output by the frequency standard source 108 into a phase comparator 111 for phase comparison, so as to obtain an absolute phase difference of the optical carrier microwave signal caused by the optical fiber delay change;
further, the phase detector 110 performs band-pass filtering on the signal, then performs electrical mixing, and then filters and outputs a difference frequency signal with phase jitter information of the optical carrier microwave signal;
furthermore, a programmable frequency divider is arranged in the phase comparator to ensure that the same-frequency phase comparison can be carried out between signals with different frequencies;
step 6, the absolute phase difference output by the phase comparator 111 is sent to the microprocessor 112 for processing, and the obtained absolute phase difference is divided by the signal frequency and converted into the time change information of the optical fiber.
In this embodiment, the frequency standard source may output different frequency signals synchronized in phase.
In this embodiment, the signal generator is a microwave signal generator, and the signal generator and the frequency standard source are phase-synchronized.
In this embodiment, the first driving signal of the acousto-optic modulator is provided by a frequency standard source output signal.
In this embodiment, the phase detector is composed of a band-pass filter and a mixer.
In this embodiment, the phase comparator has a programmable divider built in.
FIG. 4 shows the delay variation of 1m fiber measured by the method of the present invention and a commercial timer, respectively. The 1m optical fiber is short in distance, so that the transmission delay of the 1m optical fiber is theoretically constant, and the measurement accuracy of different measurement methods can be checked through the transmission delay measurement of the 1m optical fiber. The transmission delay variation of the 1m optical fiber measured by the commercial counter is within +/-25 picoseconds, while the delay variation measured by the measuring device and the measuring method of the invention is within +/-0.5 picosecond, and the measuring precision is obviously improved by more than 50 times.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. An optical fiber delay variation measuring device based on microwave photons is characterized by comprising: the optical frequency comb generating module, the optical carrier microwave up-conversion module, the optical fiber delay sensing module, the phase detecting module and the phase-time conversion module;
the optical frequency comb generating module is used for modulating the optical signal into an optical frequency comb signal and dividing the optical frequency comb signal into two paths to form a first path of optical frequency comb signal and a second path of optical frequency comb signal;
the optical carrier microwave up-conversion module is used for sequentially filtering, up-converting and coupling the first path of optical frequency comb signal to form an optical carrier microwave signal;
the optical fiber delay sensing module is used for transmitting the optical carrier microwave signal to an optical fiber to be detected for delay sensing, performing secondary frequency shift, and returning the optical carrier microwave signal to the optical carrier microwave up-conversion module through the original path of the Faraday rotator to obtain a return optical carrier microwave signal;
the phase detection module is used for detecting the phase error of the returned optical carrier microwave signal and the second path of optical frequency comb signal to obtain the absolute phase difference of the optical carrier microwave signal caused by the optical fiber delay variation;
and the phase-time conversion module divides the absolute phase difference by the signal frequency to obtain optical fiber delay information.
2. The apparatus of claim 1, wherein the optical frequency comb generating module comprises a fiber laser, a signal generator, an optical frequency comb generator, a frequency standard source; the optical carrier microwave up-conversion module comprises an optical coupler, a circulator, a polarization maintaining array waveguide grating and a first acousto-optic modulator; the optical fiber delay sensing module comprises an optical fiber to be tested, a second acousto-optic modulator and a Faraday optical rotation mirror; the phase detection module comprises an optical coupler, a balance detector, a phase detector, a frequency standard source and a phase comparator; the phase-time conversion module includes a microprocessor.
3. The apparatus of claim 2, wherein the frequency reference source has three output ports, a first output port connected to the synchronous port of the signal generator, a second output port connected to the driving port of the first acousto-optic modulator, and a third output port connected to the phase comparator.
4. An optical fiber delay change measuring method based on microwave photons is characterized by comprising the following steps:
step 1, modulating an optical signal output by an optical fiber laser by an optical frequency comb generator driven by a signal generator to generate an optical frequency comb signal;
step 2, the optical frequency comb signal is divided into two paths by a 1 × 2 optical coupler to form a first optical frequency comb signal and a second optical frequency comb signal, the first optical frequency comb signal enters a port 1 of a circulator, then is output from a port 2 of the circulator to enter a polarization maintaining array waveguide grating, two optical carriers are filtered out after passing through the polarization maintaining array waveguide grating, one optical carrier is subjected to up-conversion by a first acousto-optic modulator, then is coupled with the other optical carrier by the 2 × 1 optical coupler to form an optical carrier microwave signal, and then is sent to an optical fiber to be detected for delay sensing;
step 3, transmitting the optical carrier microwave signal to the optical fiber to be detected for time delay sensing, then performing secondary frequency shift by a second acousto-optic modulator, then reflecting by a Faraday optical rotation mirror, sequentially passing through the second acousto-optic modulator, the optical fiber to be detected, the first acousto-optic modulator and the polarization-preserving array waveguide grating, then entering a port 2 of a circulator, and finally outputting a return optical carrier microwave signal from a port 3 of the circulator;
step 4, the second optical frequency comb signal is used as a reference signal for phase detection, and the second optical frequency comb signal and the return optical carrier microwave signal are subjected to frequency mixing in a 2 x 2 optical coupler;
step 5, converting the output signal after frequency mixing into an electric signal through a balanced photoelectric detector, generating a phase jitter signal through a phase detector, and performing phase comparison on the generated phase jitter signal and a frequency standard source signal in a phase comparator to obtain an absolute phase difference of the optical carrier microwave signal caused by optical fiber delay variation;
and 6, the phase-time conversion module divides the absolute phase difference obtained by the phase comparator by the transmission frequency to calculate the delay change of the optical fiber.
5. The method according to claim 4, wherein the frequency standard source outputs different frequency signals synchronized in phase.
6. The method of claim 4, wherein the signal generator is a microwave signal generator, and the signal generator is phase synchronized with the frequency reference source.
7. The microwave-photon-based fiber delay variation measurement method of claim 4, wherein the first acousto-optic modulator drive signal is provided by a frequency standard source output signal.
8. The microwave-photon-based fiber delay variation measurement method of claim 4, wherein the phase detector comprises a band-pass filter and a mixer.
9. The microwave-photon-based optical fiber delay variation measurement method of claim 4, wherein the phase comparator has a programmable frequency divider built therein.
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| CN114745045B (en) * | 2022-03-10 | 2023-11-03 | 吉林大学 | C-OTDR-based few-mode optical fiber differential mode group delay measurement method |
| CN115021849B (en) * | 2022-05-20 | 2024-04-26 | 天津师范大学 | Optical fiber time synchronization device and method based on photoelectric combination time compensation |
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