CN103944644A - Optical coherent system based on matching delay sampling and phase noise measuring and compensating method - Google Patents
Optical coherent system based on matching delay sampling and phase noise measuring and compensating method Download PDFInfo
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Abstract
The invention provides an optical coherent system based on matching delay sampling and a phase noise measuring and compensating method. Optical signals form a third path output end and a fourth path output end through a second optical coupler, the third path output end is connected with the first input end of a 90-degree hybrid optical coupler through polarization maintaining optical fibers, the optical signals are output through the fifth path output end of the 90-degree hybrid optical coupler, the fourth path output end is directly connected with the second input end of the 90-degree hybrid optical coupler, the optical signals are output through the sixth path output end of the 90-degree hybrid optical coupler, the fifth path output end is connected with the input end of a first difference photoelectric detector, the sixth path output end is connected with the input end of a second difference photoelectric detector, and the optical signals are output through the output ends of the two difference photoelectric detectors. According to the optical coherent system based on the matching delay sampling and the phase noise measuring and compensating method, short-distance optical fibers can be used for measuring, long-distance optical fibers are not needed, and due to the fact the result is to accumulate phase noise, compensation can be carried out on coherent systems of various different types or different lengths.
Description
Technical field
The present invention relates to the measurement of a kind of smooth coherent communication and light coherent measurement technical field and the method for compensation coherent system phase noise, particularly, relate to a kind of based on matching delay sampled light coherent system and measurement and compensation phase noise method.
Background technology
Light coherent system, due to its high sensitivity, is applied to the field such as optical fiber communication, Fibre Optical Sensor, for example optical frequency domain reflectometer (0FDR).As shown in Figure 1, be optical frequency domain reflectometer (OFDR) measuring system schematic diagram.Optical frequency domain reflectometer (OFDR) is made up of sweeping laser device, two optical couplers, a circulator, a photodetector, utilize the Rayleigh back scattering of laser in optical fiber, with the reflectivity of mode distributed measurement optical fiber on frequency domain of being concerned with.The optical signals optical coupler I that sweeping laser device produces is divided into two-way, one road light signal enters testing fiber by circulator, the Rayleigh back scattering of testing fiber enters the input I of optical coupler II again by circulator, another road directly enters the input I of optical coupler II, the output optical signal of optical coupler II enters photodetector and is converted into the signal of telecommunication, be transformed on frequency domain by doing Fourier transform after data collecting card image data, can reflect the distributed reflection trace of optical fiber.But due to the existence of phase noise, can significantly reduce the availability of coherent system.Through retrieval pertinent literature, the method in coherent system is mainly to utilize an auxiliary arm of interfering to carry out compensation phase noise now, has two kinds of modes to compensate.A kind of is the mode of simulation, the people such as Brian J.Soller are published in scientific paper " High resolution optical frequency domain reflectometry for characterization of components and assemblies " in scholarly journal " 0pitcs Express " (optics letter) (the high-resolution optical frequency domain reflectometer of describing for the feature of assembly and parts) and mention and can utilize the auxiliary arm clock signal of interfering to compensate coherent system, this mode can obtain good effect, but auxiliary interference arm that need to be very long is to obtain the clock signal of enough frequencies, this has increased the unsteadiness of system.Another kind is digital mode, the people such as Tae-Jung Ahn are published in the scientific paper " Suppression of nonlinear frequency sweep in an optical frequency-domain reflectometer by use of Hilbert transformation " (utilizing Hilbert transform to suppress the nonlinear frequency sweeping in optical frequency domain reflectometer) in scholarly journal " Applied Optics " (Application Optics) and mention and utilize the signal that gathers auxiliary interference arm to carry out resampling, thereby the phase noise of compensation coherent system, this method can obtain good compensation effect, but can only change slower phase noise for compensation, the phase noise that for example nonlinear frequency sweeping brings, the scope of application is little.
Summary of the invention
Object of the present invention with the deficiency that overcomes existing phase noise measurement and compensation method, propose a kind of based on matching delay sampled light coherent system and measurement and compensation phase noise method, shorten the fiber lengths needing while measuring phase noise, can compensate fast-changing phase noise, and can compensate the dissimilar and different coherent systems that postpone difference.
The present invention is achieved by the following technical solutions.
According to a first aspect of the invention, a kind of measurement and bucking-out system based on matching delay sampling is provided, comprise the second optical coupler, 90 degree mixed light coupler and difference photodetectors, light signal forms Third Road output He tetra-road outputs by described the second optical coupler, described Third Road output is connected with first input of 90 degree mixed light couplers by polarization maintaining optical fibre, and exported by 90 degree mixed light coupler five road outputs, described Si road output is directly connected with second input of 90 degree mixed light couplers, and exported by 90 degree mixed light coupler six road outputs, described difference photodetector comprises the first difference photodetector and the second difference photodetector, described Wu road output is connected with the input of the first difference photodetector, described Liu road output is connected with the input of the second difference photodetector, and exported by the output of two difference photodetectors.
Preferably, described Wu road output He six road outputs have respectively two output ports, and correspondingly, each difference photodetector is equipped with two input ports.
Preferably, the parameter of two difference photodetectors is consistent.
According to a second aspect of the invention, provide a kind of above-mentioned measurement of sampling based on matching delay and the method for bucking-out system, comprised the following steps:
Step 1, light signal is divided into Third Road light signal He tetra-road light signals by the second optical coupler, wherein Third Road light signal, through polarization maintaining optical fibre, is input to first input of 90 degree mixed light couplers, and Si road light signal is directly inputted to second input of 90 degree mixed light couplers;
Step 2, the light signal of 90 degree mixed light coupler five road output He six road outputs is input to respectively in the input of difference photodetector, and is exported by the output of two difference photodetectors.
Preferably, the input signal of first input of described 90 degree mixed light couplers is S, the input signal of second input is L,, the signal of two port outputs of 90 degree mixed light coupler Wu road outputs is respectively S+L, S-L, the signal of two port outputs of 90 degree mixed light coupler Liu road outputs is respectively S+jL, S-jL, wherein, j is imaginary unit.
According to a third aspect of the present invention, provide a kind of based on matching delay sampled light coherent system, comprise laser, the first optical coupler, optical frequency domain reflectometer measuring system and above-mentioned measurement and bucking-out system, described laser forms first via output and the second road output by the first optical coupler, wherein, described first via output is connected with the input of optical frequency domain reflectometer measuring system, and described the second road output is connected with the input of the second optical coupler of bucking-out system with measurement.
Preferably, also comprise data collecting card and computer, the output of described optical frequency domain reflectometer measuring system and measurement are all connected with the input of data collecting card with the output of two difference photodetectors of bucking-out system, and the output of described data collecting card is connected with computer.
Preferably, the two ways of optical signals propagation delay time difference between the Coupling point of described the second optical coupler and the Coupling point of 90 degree mixed light couplers equated with the sampling period of data collecting card.
According to a fourth aspect of the present invention, provide a kind of above-mentioned measurement and compensation phase noise method based on matching delay sampled light coherent system, comprised the following steps:
The first step, the light signal of laser output is divided into first via light signal and the second road light signal by the first polarization-maintaining coupler, wherein, first via light signal is output after optical frequency domain reflectometer is measured, the second road light signal is divided into Third Road light signal He tetra-road light signals through the second optical coupler, and wherein, Third Road light signal is through polarization maintaining optical fibre, be input to first input of 90 degree mixed light couplers, Si road light signal is directly inputted to second input of 90 degree mixed light couplers;
Second step, the light signal of 90 degree mixed light coupler five road output He six road outputs is input to respectively in the input of difference photodetector;
The 3rd step, the signal of telecommunication of difference photodetector output output and first via light signal are input to the input of data collecting card jointly, synchronously carry out data acquisition;
The 4th step, the data that data collecting card is received are carried out data processing, obtain the relative phase information of light signal, i.e. the time domain of the phase noise of laser reflection;
The 5th step, the first via light signal of synchronous acquisition is data to be compensated, by computer processes together with the data that obtain with the 4th step, obtains phase noise compensation result.
Preferably, data processing in described the 4th step is specially: the data that the input port of the first difference photodetector is collected are as real part, the data that the input port of the second difference photodetector collects are as imaginary part, obtain one group of complex data, ask for its phase place, phase place is cumulative one by one, obtain the phase information in laser time domain.
Compared with prior art, the present invention has following technical characterstic:
Adopt short distance optical fiber to measure, avoided employing long-distance optical fiber, can compensate fast-changing phase noise, because result is accumulated phase noise, can compensate the coherent system of number of different types or different length.
Brief description of the drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is existing optical frequency domain reflectometer (0FDR) measuring system schematic diagram;
Fig. 2 is measurement and the bucking-out system structure principle chart that the present invention is based on matching delay sampling
Fig. 3 is for the present invention is based on matching delay sampled light coherent system structure principle chart;
Fig. 4 is the trace diagram at the tail end pip place of existing optical frequency domain reflectometer (while compensation) measurement;
Fig. 5 is the trace diagram through the tail end pip place that after the present invention's compensation, optical frequency domain reflectometer is measured;
In figure: 1 is optical coupler I, 2 is optical coupler II, and 3 is circulator, and 4 is the first optical coupler, and 5 is the second optical coupler, and 6 is polarization maintaining optical fibre.
Embodiment
Below embodiments of the invention are elaborated: the present embodiment is implemented under taking technical solution of the present invention as prerequisite, provided detailed execution mode and concrete operating process.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Embodiment 1
The present embodiment provides a kind of measurement and bucking-out system based on matching delay sampling, comprise the second optical coupler, 90 degree mixed light coupler and difference photodetectors, light signal forms Third Road output He tetra-road outputs by described the second optical coupler, described Third Road output is connected with first input of 90 degree mixed light couplers by polarization maintaining optical fibre, and exported by 90 degree mixed light coupler five road outputs, described Si road output is directly connected with second input of 90 degree mixed light couplers, and exported by 90 degree mixed light coupler six road outputs, described difference photodetector comprises the first difference photodetector and the second difference photodetector, described Wu road output is connected with the input of the first difference photodetector, described Liu road output is connected with the input of the second difference photodetector, and exported by the output of two difference photodetectors.
Further, described Wu road output He six road outputs have respectively two output ports, and correspondingly, each difference photodetector is equipped with two input ports.
Further, the parameter of two difference photodetectors is consistent.
Fig. 2 is the fundamental diagram of embodiment 1.
Above-mentioned measurement and the bucking-out system based on matching delay sampling that embodiment 1 provides, its measurement and compensation method, comprise the following steps:
Step 1, light signal is divided into Third Road light signal He tetra-road light signals by the second optical coupler, wherein Third Road light signal, through polarization maintaining optical fibre, is input to first input of 90 degree mixed light couplers, and Si road light signal is directly inputted to second input of 90 degree mixed light couplers;
Step 2, the light signal of 90 degree mixed light coupler five road output He six road outputs is input to respectively in the input of difference photodetector, and is exported by the output of two difference photodetectors.
Further, the input signal of first input of described 90 degree mixed light couplers is S, the input signal of second input is L,, the signal of two port outputs of 90 degree mixed light coupler Wu road outputs is respectively S+L, S-L, the signal of two port outputs of 90 degree mixed light coupler Liu road outputs is respectively S+jL, S-jL, wherein, j is imaginary unit.
Embodiment 2
It is a kind of based on matching delay sampled light coherent system that the present embodiment provides, comprise laser, the first optical coupler, optical frequency domain reflectometer measuring system and above-mentioned measurement and bucking-out system, described laser forms first via output and the second road output by the first optical coupler, wherein, described first via output is connected with the input of optical frequency domain reflectometer measuring system, and described the second road output is connected with the input of the second optical coupler of bucking-out system with measurement.
Further, also comprise data collecting card and computer, the output of described optical frequency domain reflectometer measuring system and measurement are all connected with the input of data collecting card with the output of two difference photodetectors of bucking-out system, and the output of described data collecting card is connected with computer.
Further, the two ways of optical signals propagation delay time difference between the Coupling point of described the second optical coupler and the Coupling point of 90 degree mixed light couplers equated with the sampling period of data collecting card.
Fig. 3 is the fundamental diagram of embodiment 2.
As shown in Figure 3, parts and the assembly of the present embodiment mainly comprise: the first optical coupler and the second optical coupler are protects polarisation coupler, one 90 degree mixed light coupler, a length is about the polarization maintaining optical fibre of 4m, two difference photodetectors that parameter is consistent, a data collecting card that sample frequency is 50MHz, a sweeping laser device: its sweep rate is about 133GHz/s, an optical frequency domain reflectometer measuring system, the testing fiber of a 1.5km.
The operation principle of the present embodiment is: the output optical signal of sweeping laser device is divided into two-way by the first optical coupler, lead up to optical frequency domain reflectometer measuring system, second optical coupler of leading up to is further divided into two-way, lead up to the polarization maintaining optical fibre of the about 4m of length, together with another road by 90 degree mixed light couplers.The consistent difference photodetector of two parameters of 4 route of 90 degree mixed light coupler outputs receives.Together with the output signal of last and optical frequency domain reflectometer measuring system, by data collecting card synchronized sampling, the data of sampling are passed through data processing and obtain the phase noise information of laser, with the phase noise of its final compensating light frequency-domain reflectometer measuring system.
Provided by the invention above-mentioned based on matching delay sampled light coherent system, it is measured and compensation phase noise method, comprises the following steps:
The first step, the light signal of laser output is divided into first via light signal and the second road light signal by the first polarization-maintaining coupler, wherein, first via light signal is output after optical frequency domain reflectometer is measured, the second road light signal is divided into Third Road light signal He tetra-road light signals through the second optical coupler, and wherein, Third Road light signal is through polarization maintaining optical fibre, be input to first input of 90 degree mixed light couplers, Si road light signal is directly inputted to second input of 90 degree mixed light couplers;
Second step, the light signal of 90 degree mixed light coupler five road output He six road outputs is input to respectively in the input of difference photodetector;
The 3rd step, the signal of telecommunication of difference photodetector output output and first via light signal are input to the input of data collecting card jointly, synchronously carry out data acquisition;
The 4th step, the data that data collecting card is received are carried out data processing, obtain the relative phase information of light signal, i.e. the time domain of the phase noise of laser reflection;
The 5th step, the first via light signal of synchronous acquisition is data to be compensated, by computer processes together with the data that obtain with the 4th step, obtains phase noise compensation result.
Further, data processing in described the 4th step is specially: the data that the input port of the first difference photodetector is collected are as real part, the data that the input port of the second difference photodetector collects are as imaginary part, obtain one group of complex data, ask for its phase place, phase place is cumulative one by one, obtain the phase information in laser time domain.
Specific as follows:
One, measure phase noise.
The output optical signal of sweeping laser device can be expressed as
,
wherein E
0for light field amplitude, the end that e is natural logrithm, j is imaginary unit,
for the phase place of laser output optical signal, t is the time, and γ is sweep rate, ω
0t is initial frequency, and ε (t) is phase noise item.Input 90 degree mixed light coupler two paths of signals are made as S and L,
and
wherein T
refthe delay that is two-way between the second optical coupler Coupling point and 90 degree mixed light coupler Coupling points is poor.In the present embodiment, T
reffor 20ns, the light signal of 90 degree mixed light coupler four tunnel outputs is respectively S+L, S-L, S+jL, S-jL.
The signal of telecommunication that receives output through two consistent difference photodetectors of parameter is respectively:
Wherein σ is the sensitivity of difference photodetector.
Discrete signal through data collecting card collection is:
Wherein t
ifor i sampling instant of data collecting card, the sampling interval of capture card is Δ t=t
i-t
i-1.
By synthetic these two signals complex signal S
ref(t
i)=S
ref1(t
i)+jS
ref2(t
i), ask for its phase place, can be at t
ithe phase place in moment is:
If the sampling interval Δ t of capture card meets Δ t=T
ref, have:
By X (t
i) do cumulatively, have:
Therefore phase noise item is:
Two, compensation phase noise.
The signal direct ratio that the output optical signal of sweeping laser device obtains by OFDR is:
The round-trip delay that wherein τ is testing fiber, R (τ) is that testing fiber is the rear to Rayleigh scattering rate of τ place in round-trip delay, T
mfor the round-trip delay of measuring distance farthest.
The trace diagram at the testing fiber tail end pip place measuring for OFDR as shown in Figure 3.Can see the impact due to phase noise, should be that the pip trace of spike has become Lorentz figure.
Can obtain ε (t) by previous step, make e (t)=e
-j ε (t), make S
1(t)=S (t) e (t), to S
1(t) carry out Fourier transform:
Introduce residual video phase item exp (j π f
2/ γ), become:
Above φ C
1, φ C
2for stationary phase item.Order
:
It is done to inverse Fourier transform:
If
inverse Fourier transform be e
rVP(f), order:
This is the signal after compensation, and its frequency spectrum is the reflection trace of the OFDR after compensation.
Fig. 4 is the trace diagram of the testing fiber tail end pip after compensation.
In the present embodiment, the light signal of Laser output is divided into two-way by protecting polarisation coupler, through different delays, then is coupled by 90 degree mixed light couplers; 90 degree optical coupler outputs are received by two consistent differential couplers of parameter; Data collecting card gathers the output of difference photodetector, and the data of data collecting card collection are carried out to data processing, obtains the relative phase information of light signal, and this is the time domain reflection of the phase noise of laser; If need to compensate coherent system, by coherent system and above synchronal data sampling, the data to be compensated of synchronous acquisition are carried out algorithm process together with the time domain of the phase noise of the laser obtaining reflection result, and result is phase noise compensation result.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (10)
1. measurement and the bucking-out system based on matching delay sampling, it is characterized in that, comprise the second optical coupler, 90 degree mixed light coupler and difference photodetectors, light signal forms Third Road output He tetra-road outputs by described the second optical coupler, described Third Road output is connected with first input of 90 degree mixed light couplers by polarization maintaining optical fibre, and exported by 90 degree mixed light coupler five road outputs, described Si road output is directly connected with second input of 90 degree mixed light couplers, and exported by 90 degree mixed light coupler six road outputs, described difference photodetector comprises the first difference photodetector and the second difference photodetector, described Wu road output is connected with the input of the first difference photodetector, described Liu road output is connected with the input of the second difference photodetector, and exported by the output of two difference photodetectors.
2. measurement and the bucking-out system based on matching delay sampling according to claim 1, it is characterized in that, described Wu road output He six road outputs have respectively two output ports, and correspondingly, each difference photodetector is equipped with two input ports.
3. measurement and the bucking-out system based on matching delay sampling according to claim 1, is characterized in that, the parameter of two difference photodetectors is consistent.
4. one kind based on matching delay sampled light coherent system, it is characterized in that, comprise measurement and bucking-out system described in any one in laser, the first optical coupler, optical frequency domain reflectometer measuring system and claims 1 to 3, described laser forms first via output and the second road output by the first optical coupler, wherein, described first via output is connected with the input of optical frequency domain reflectometer measuring system, and described the second road output is connected with the input of the second optical coupler of bucking-out system with measurement.
5. according to claim 1 based on matching delay sampled light coherent system, it is characterized in that, also comprise data collecting card and computer, the output of described optical frequency domain reflectometer measuring system and measurement are all connected with the input of data collecting card with the output of two difference photodetectors of bucking-out system, and the output of described data collecting card is connected with computer.
6. according to claim 5 based on matching delay sampled light coherent system, it is characterized in that, the two ways of optical signals propagation delay time difference between the Coupling point of described the second optical coupler and the Coupling point of 90 degree mixed light couplers equated with the sampling period of data collecting card.
7. the measurement based on matching delay sampling described in any one and a method for bucking-out system in claims 1 to 3, is characterized in that, comprises the following steps:
Step 1, light signal is divided into Third Road light signal He tetra-road light signals by the second optical coupler, wherein Third Road light signal, through polarization maintaining optical fibre, is input to first input of 90 degree mixed light couplers, and Si road light signal is directly inputted to second input of 90 degree mixed light couplers;
Step 2, the light signal of 90 degree mixed light coupler five road output He six road outputs is input to respectively in the input of difference photodetector, and is exported by the output of two difference photodetectors.
8. measurement of sampling based on matching delay according to claim 7 and the method for bucking-out system, it is characterized in that, the input signal of first input of described 90 degree mixed light couplers is S, and the input signal of second input is L,, the signal of two port outputs of 90 degree mixed light coupler Wu road outputs is respectively S+L, S-L, the signal of two port outputs of 90 degree mixed light coupler Liu road outputs is respectively S+jL, S-jL, wherein, j is imaginary unit.
9. the measurement based on matching delay sampled light coherent system and the compensation phase noise method described in any one in claim 4 to 6, is characterized in that, comprises the following steps:
The first step, the light signal of laser output is divided into first via light signal and the second road light signal by the first polarization-maintaining coupler, wherein, first via light signal is output after optical frequency domain reflectometer is measured, the second road light signal is divided into Third Road light signal He tetra-road light signals through the second optical coupler, and wherein, Third Road light signal is through polarization maintaining optical fibre, be input to first input of 90 degree mixed light couplers, Si road light signal is directly inputted to second input of 90 degree mixed light couplers;
Second step, the light signal of 90 degree mixed light coupler five road output He six road outputs is input to respectively in the input of difference photodetector;
The 3rd step, the signal of telecommunication of difference photodetector output output and first via light signal are input to the input of data collecting card jointly, synchronously carry out data acquisition;
The 4th step, the data that data collecting card is received are carried out data processing, obtain the relative phase information of light signal, i.e. the time domain of the phase noise of laser reflection;
The 5th step, the first via light signal of synchronous acquisition is data to be compensated, by computer processes together with the data that obtain with the 4th step, obtains phase noise compensation result.
10. measurement and the compensation phase noise method based on matching delay sampled light coherent system according to claim 9, it is characterized in that, data processing in described the 4th step is specially: the data that the input port of the first difference photodetector is collected are as real part, the data that the input port of the second difference photodetector collects are as imaginary part, obtain one group of complex data, ask for its phase place, phase place is cumulative one by one, obtain the phase information in laser time domain.
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| CN105467188A (en) * | 2014-09-05 | 2016-04-06 | 易能乾元（北京）电力科技有限公司 | All-fiber current sensor adopting segmented light path fault diagnosis |
| CN105737866A (en) * | 2016-03-25 | 2016-07-06 | 江苏骏龙电力科技股份有限公司 | Delay match sampling laser phase noise compensation device |
| WO2018059387A1 (en) * | 2016-09-30 | 2018-04-05 | 华为技术有限公司 | Data transmission method, related device and system |
| CN110487313A (en) * | 2019-08-02 | 2019-11-22 | 哈尔滨工业大学 | Light source frequency sweep Nonlinear Self-tuning method in optical frequency domain reflection technology |
| CN113639650A (en) * | 2021-08-10 | 2021-11-12 | 安徽大学 | Optical frequency domain reflectometer type sensing demodulation method based on phase accumulation measurement method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105467188A (en) * | 2014-09-05 | 2016-04-06 | 易能乾元（北京）电力科技有限公司 | All-fiber current sensor adopting segmented light path fault diagnosis |
| CN105467188B (en) * | 2014-09-05 | 2018-09-14 | 马鞍山万兆科技有限公司 | A kind of all-fiber current sensor using segmented light path fault diagnosis |
| CN105737866A (en) * | 2016-03-25 | 2016-07-06 | 江苏骏龙电力科技股份有限公司 | Delay match sampling laser phase noise compensation device |
| WO2018059387A1 (en) * | 2016-09-30 | 2018-04-05 | 华为技术有限公司 | Data transmission method, related device and system |
| US11483111B2 (en) | 2016-09-30 | 2022-10-25 | Huawei Technologies Co., Ltd. | Data transmission method, related apparatus, and system |
| CN110487313A (en) * | 2019-08-02 | 2019-11-22 | 哈尔滨工业大学 | Light source frequency sweep Nonlinear Self-tuning method in optical frequency domain reflection technology |
| CN110487313B (en) * | 2019-08-02 | 2021-04-16 | 哈尔滨工业大学 | Light source frequency sweep nonlinear self-correction method in optical frequency domain reflection technology |
| CN113639650A (en) * | 2021-08-10 | 2021-11-12 | 安徽大学 | Optical frequency domain reflectometer type sensing demodulation method based on phase accumulation measurement method |
| CN113639650B (en) * | 2021-08-10 | 2023-12-12 | 安徽大学 | Optical frequency domain reflectometer type sensing demodulation method based on phase accumulation measurement method |
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