CN103944644B - Based on matching delay sampled light coherent system - Google Patents
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Abstract
The invention provides one kind based on matching delay sampled light coherent system and measurement and compensation phase noise method, optical signal forms the 3rd tunnel output end and the 4th tunnel output end by the second photo-coupler, 3rd tunnel output end is connected by polarization maintaining optical fibre with first input of 90 degree of mixing photo-couplers, and the 5th tunnel output end by 90 degree of mixing photo-couplers is exported, second input of the 4th tunnel output end directly with 90 degree of mixing photo-couplers is connected, and the 6th tunnel output end by 90 degree of mixing photo-couplers is exported, 5th tunnel output end is connected with the input of the first difference photodetector, 6th tunnel output end is connected with the input of the second difference photodetector, and exported by two output ends of difference photodetector.The present invention can be measured with short distance optical fiber, it is to avoid use long-distance optical fiber, because result is accumulated phase noise, the coherent system of various different types or different length can be compensated.
Description
Technical field
Measurement and compensation coherent system phase the present invention relates to a kind of smooth coherent communication and light coherent measurement technical field
The method of noise, in particular it relates to a kind of be based on matching delay sampled light coherent system and measurement with compensation phase noise method.
Background technology
Light coherent system is employed for the fields such as fiber optic communication, Fibre Optical Sensor, such as optical frequency due to its high sensitivity
Domain reflectometer (0FDR).As shown in figure 1, being optical frequency domain reflectometer (OFDR) measuring system schematic diagram.Optical frequency domain reflectometer
(OFDR) it is made up of frequency swept laser, two photo-couplers, circulator, a photodetectors, using laser in optical fiber
In Rayleigh beacon, by be concerned with the way of on frequency domain distributed measurement optical fiber reflectivity.What frequency swept laser was produced
Optical signals photo-coupler I points is two-way, and optical signal enters testing fiber by circulator all the way, and the Rayleigh of testing fiber is backward
Scattering enters the input I of photo-coupler II by circulator again, and another road is directly entered the input I of photo-coupler II, light
The output optical signal of coupler II is converted into electric signal into photodetector, by being in Fu after data collecting card gathered data
Leaf transformation is transformed on frequency domain, you can the distributed reflection trace of reflection optical fiber.Yet with the presence of phase noise, can significantly
Degree reduces the availability of coherent system.Through retrieval pertinent literature, the method in present coherent system mainly use one it is auxiliary
Help interfere arm to compensate phase noise, there is two ways to compensate.A kind of is the mode of simulation, Brian J.Soller et al.
It is published in scholarly journal《0pitcs Express》Scientific paper " High resolution optical in (optics letter)
frequency domain reflectometry for characterization of components and
Being mentioned in assemblies " (for the high-resolution optical frequency domain reflectometer of the feature description of assembly and part) can utilize auxiliary
Help interfere arm to export clock signal to compensate coherent system, this mode can obtain preferable effect, however it is necessary that very
Auxiliary interfere arm long which increases the unstability of system to obtain the clock signal of enough frequencies.Another kind is digital
Mode, Tae-Jung Ahn et al. are published in scholarly journal《Applied Optics》Scientific paper in (Application Optics)
“Suppression of nonlinear frequency sweep in an optical frequency-domain
Reflectometer by use of Hilbert transformation " (suppress light frequency domain anti-using Hilbert transform
Penetrate meter in nonlinear frequency sweeping) in mention using collection auxiliary interfere arm signal carry out resampling, so as to compensate coherent system
Phase noise, this method can obtain good compensation effect, but can only be directed to the slower phase noise of compensation change,
The phase noise that such as nonlinear frequency sweeping brings, the scope of application is small.
The content of the invention
The purpose of the present invention with overcome the shortcomings of existing phase noise measurement and compensation method, it is proposed that one kind based on
With delay sampling light coherent system and measurement and compensation phase noise method, the optical fiber needed during measurement phase noise is shortened long
Degree, can compensate fast-changing phase noise, it is possible to which the coherent system to different type and different delays difference is compensated.
The present invention is achieved by the following technical solutions.
According to the first aspect of the invention, there is provided a kind of measurement and compensation system based on matching delay sampling, bag
The second photo-coupler, 90 degree of mixing photo-coupler and difference photodetectors are included, optical signal passes through second photo-coupler
The 3rd tunnel output end and the 4th tunnel output end are formed, the 3rd tunnel output end mixes photo-coupler by polarization maintaining optical fibre with 90 degree
First input be connected, and the 5th tunnel output ends by 90 degree of mixing photo-couplers are exported, the 4th tunnel output end
Directly second input with 90 degree of mixing photo-couplers is connected, and by 90 degree of the 6th tunnel output ends of mixing photo-coupler
Output, the difference photodetector includes the first difference photodetector and the second difference photodetector, the 5th tunnel
Output end is connected with the input of the first difference photodetector, the 6th tunnel output end and the second difference photodetector
Input be connected, and exported by the output ends of two difference photodetectors.
Preferably, the 5th tunnel output end and the 6th tunnel output end have two output ports respectively, correspondingly, each
Difference photodetector is equipped with two input ports.
Preferably, the parameter of two difference photodetectors is consistent.
According to the second aspect of the invention, there is provided a kind of above-mentioned measurement and compensation system based on matching delay sampling
Method, comprise the following steps：
Step 1, optical signal is divided into the 3rd road optical signal and the 4th road optical signal by the second photo-coupler, wherein the 3rd tunnel
Optical signal is input to 90 degree of first inputs of mixing photo-coupler by polarization maintaining optical fibre, and the 4th road optical signal is directly inputted
To 90 degree of second inputs of mixing photo-coupler；
Step 2, the optical signal of 90 degree of the 5th tunnel output ends and the 6th tunnel output end for mixing photo-coupler is separately input to
In the input of difference photodetector, and exported by two output ends of difference photodetector.
Preferably, first input signal of input of 90 degree of mixing photo-coupler is S, second input
Input signal be L, then, and 90 degree mixing the tunnel output ends of photo-coupler the 5th two ports export signal be respectively S+L, S-
L, the signal of 90 degree of two ports outputs of the mixing tunnel output end of photo-coupler the 6th is respectively S+jL, S-jL, wherein, j is void
Number unit.
According to the third aspect of the present invention, there is provided one kind is based on matching delay sampled light coherent system, including laser
Device, the first photo-coupler, optical frequency domain reflectometer measuring system and above-mentioned measurement and compensation system, the laser pass through first
Photo-coupler forms first via output end and the second tunnel output end, wherein, the first via output end is measured with probe beam deflation
The input of amount system is connected, the input phase of second tunnel output end and measurement and the second photo-coupler of compensation system
Connection.
Preferably, also including data collecting card and computer, the output end of the optical frequency domain reflectometer measuring system and
Measurement is connected with two output ends of difference photodetector of compensation system with the input of data collecting card, the number
Output end according to capture card is connected with computer.
Preferably, the two-way light between the Coupling point of second photo-coupler and 90 degree of Coupling points of mixing photo-coupler
Propagation delay time difference is equal with the sampling period of data collecting card.
According to the fourth aspect of the present invention, there is provided a kind of above-mentioned measurement based on matching delay sampled light coherent system
With compensation phase noise method, comprise the following steps：
The first step, the optical signal of laser output is divided into first via optical signal and the second road light by the first polarization-maintaining coupler
Signal, wherein, first via optical signal is exported by after optical frequency domain reflectometer measurement, and the second road optical signal is by the second photo-coupler
It is divided into the 3rd road optical signal and the 4th road optical signal, wherein, the 3rd road optical signal is input to 90 degree of mixed lights by polarization maintaining optical fibre
First input of coupler, the 4th road optical signal is directly inputted to 90 degree of second inputs of mixing photo-coupler；
Second step, the optical signal of 90 degree of the 5th tunnel output ends and the 6th tunnel output end for mixing photo-coupler is separately input to
In the input of difference photodetector；
3rd step, the electric signal of difference photodetector output end output is input to data and adopts jointly with first via optical signal
The input of truck, synchronously carries out data acquisition；
4th step, the data received to data collecting card carry out data processing, obtain the relative phase information of optical signal,
That is the time domain reflection of the phase noise of laser；
5th step, the first via optical signal of synchronous acquisition is data to be compensated, is passed through together with the data obtained with the 4th step
Computer is processed, that is, obtain phase noise compensation result.
Preferably, the data processing in the 4th step is specially：The input port of the first difference photodetector is adopted
The data for collecting as real part, the data that the input port of the second difference photodetector is collected as imaginary part,
One group of complex data is obtained, its phase is asked for, phase is added up one by one, that is, obtain the phase information on laser temporal.
Compared with prior art, the present invention has following technical characterstic：
Measured using short distance optical fiber, it is to avoid use long-distance optical fiber, fast-changing phase can be compensated make an uproar
Sound, because result is accumulated phase noise, can compensate to the coherent system of various different types or different length.
Brief description of the drawings
The detailed description made to non-limiting example with reference to the following drawings by reading, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is existing optical frequency domain reflectometer (0FDR) measuring system schematic diagram；
Fig. 2 is measurement and compensation system structure principle chart of the present invention based on matching delay sampling
Fig. 3 is based on matching delay sampled light coherent system structure principle chart for the present invention；
Fig. 4 is the trace diagram at the tail end pip of existing optical frequency domain reflectometer (when not compensating) measurement；
Fig. 5 is the trace diagram at the tail end pip measured by optical frequency domain reflectometer after present invention compensation；
In figure：1 is photo-coupler I, and 2 is photo-coupler II, and 3 is circulator, and 4 is the first photo-coupler, and 5 is the second optocoupler
Clutch, 6 is polarization maintaining optical fibre.
Specific embodiment
Embodiments of the invention are elaborated below：The present embodiment is carried out under premised on technical solution of the present invention
Implement, give detailed implementation method and specific operating process.It should be pointed out that to one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Shield scope.
Embodiment 1
Present embodiments provide it is a kind of based on matching delay sampling measurement and compensation system, including the second photo-coupler,
90 degree of mixing photo-coupler and difference photodetectors, optical signal form the 3rd tunnel output end by second photo-coupler
With the 4th tunnel output end, the 3rd tunnel output end mixes first input phase of photo-coupler with 90 degree by polarization maintaining optical fibre
Connection, and by 90 degree the 5th tunnel output ends outputs of mixing photo-couplers, the 4th tunnel output end directly with 90 degree of mixed lights
Second input of coupler is connected, and by 90 degree of the 6th tunnel output end outputs of mixing photo-couplers, the difference light
Electric explorer includes the first difference photodetector and the second difference photodetector, the 5th tunnel output end and the first difference
The input of photodetector is connected, and the 6th tunnel output end is connected with the input of the second difference photodetector,
And exported by two output ends of difference photodetector.
Further, the 5th tunnel output end and the 6th tunnel output end have two output ports respectively, correspondingly, each
Individual 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 compensation system based on matching delay sampling that embodiment 1 is provided, its measurement and compensation method, bag
Include following steps：
Step 1, optical signal is divided into the 3rd road optical signal and the 4th road optical signal by the second photo-coupler, wherein the 3rd tunnel
Optical signal is input to 90 degree of first inputs of mixing photo-coupler by polarization maintaining optical fibre, and the 4th road optical signal is directly inputted
To 90 degree of second inputs of mixing photo-coupler；
Step 2, the optical signal of 90 degree of the 5th tunnel output ends and the 6th tunnel output end for mixing photo-coupler is separately input to
In the input of difference photodetector, and exported by two output ends of difference photodetector.
Further, first input signal of input of 90 degree of mixing photo-coupler is S, second input
Input signal be L, then, and 90 degree mixing the tunnel output ends of photo-coupler the 5th two ports export signal be respectively S+L, S-
L, the signal of 90 degree of two ports outputs of the mixing tunnel output end of photo-coupler the 6th is respectively S+jL, S-jL, wherein, j is void
Number unit.
Embodiment 2
Present embodiments provide it is a kind of based on matching delay sampled light coherent system, including laser, the first photo-coupler,
Optical frequency domain reflectometer measuring system and above-mentioned measurement and compensation system, the laser form first by the first photo-coupler
Road output end and the second tunnel output end, wherein, the input phase of the first via output end and optical frequency domain reflectometer measuring system
Connection, second tunnel output end is connected with measurement with the input of the second photo-coupler of compensation system.
Further, also including data collecting card and computer, the output end of the optical frequency domain reflectometer measuring system with
It is described and measurement is connected with two output ends of difference photodetector of compensation system with the input of data collecting card
The output end of data collecting card is connected with computer.
Further, the two-way between the Coupling point of second photo-coupler and 90 degree of Coupling points of mixing photo-coupler
Lightray propagation delay-time difference is equal with the sampling period of data collecting card.
Fig. 3 is the fundamental diagram of embodiment 2.
As shown in figure 3, the part and component of the present embodiment mainly include：First photo-coupler and the second photo-coupler are equal
It is polarization-maintaining photo-coupler, 90 degree of mixing photo-couplers a, length is about the polarization maintaining optical fibre of 4m, the consistent difference of two parameters
Light splitting electric explorer a, sample frequency is the data collecting card of 50MHz, a frequency swept laser：Its sweep rate is about
133GHz/s, an optical frequency domain reflectometer measuring system, a testing fiber of 1.5km.
The operation principle of the present embodiment is：The output optical signal of frequency swept laser is divided into two-way by the first photo-coupler,
Optical frequency domain reflectometer measuring system is led up to, the second photo-coupler is led up to and is further divided into two-way, lead up to length about 4m
Polarization maintaining optical fibre, and another road together by 90 degree mix photo-couplers.90 degree of 4 route, two ginsengs of mixing photo-coupler output
The consistent difference photodetector of number is received.The output signal of last and optical frequency domain reflectometer measuring system is together by data acquisition
Card synchronized sampling, the data of sampling obtain the phase noise information of laser by data processing, with its final compensation light frequency domain
The phase noise of reflectometry system.
It is above-mentioned based on matching delay sampled light coherent system that the present invention is provided, and it measures and compensates phase noise method,
Comprise the following steps：
The first step, the optical signal of laser output is divided into first via optical signal and the second road light by the first polarization-maintaining coupler
Signal, wherein, first via optical signal is exported by after optical frequency domain reflectometer measurement, and the second road optical signal is by the second photo-coupler
It is divided into the 3rd road optical signal and the 4th road optical signal, wherein, the 3rd road optical signal is input to 90 degree of mixed lights by polarization maintaining optical fibre
First input of coupler, the 4th road optical signal is directly inputted to 90 degree of second inputs of mixing photo-coupler；
Second step, the optical signal of 90 degree of the 5th tunnel output ends and the 6th tunnel output end for mixing photo-coupler is separately input to
In the input of difference photodetector；
3rd step, the electric signal of difference photodetector output end output is input to data and adopts jointly with first via optical signal
The input of truck, synchronously carries out data acquisition；
4th step, the data received to data collecting card carry out data processing, obtain the relative phase information of optical signal,
That is the time domain reflection of the phase noise of laser；
5th step, the first via optical signal of synchronous acquisition is data to be compensated, is passed through together with the data obtained with the 4th step
Computer is processed, that is, obtain phase noise compensation result.
Further, the data processing in the 4th step is specially：By the input port of the first difference photodetector
Used as real part, the data that the input port of the second difference photodetector is collected are as imaginary part for the data for collecting
Point, one group of complex data is obtained, its phase is asked for, phase is added up one by one, that is, obtain the phase information on laser temporal.
It is specific as follows：
First, phase noise is measured.
The output optical signal of frequency swept laser is represented by,Wherein E0It is light field
Amplitude, e is the bottom of natural logrithm, and j is imaginary unit,The phase of optical signal is exported for laser, t is the time, and γ is frequency sweep
Speed, ω0T is initial frequency, and ε (t) is phase noise.90 degree of mixing photo-coupler two paths of signals of input are set to S and L, thenAndWherein TrefFor the second photo-coupler Coupling point mix with 90 degree photo-coupler Coupling point it
Between two-way delay difference.In the present embodiment, TrefIt is 20ns, the optical signal of 90 degree of mixing photo-coupler four tunnel outputs is respectively S+
L, S-L, S+jL, S-jL.
The electric signal for receiving output through two consistent difference photodetectors of parameter is respectively：
Wherein σ is the sensitivity of difference photodetector.
Through data collecting card gather discrete signal be then：
Wherein tiIt it is the data collecting card ith sample moment, the sampling interval of capture card is Δ t=ti-ti-1。
By the two signals synthesis complex signal Sref(ti)=Sref1(ti)+jSref2(ti), its phase being asked for, can obtain in tiWhen
The phase at quarter is：
If the sampling interval Δ t of capture card meets Δ t=Tref, then have：
By X (ti) do cumulative, then have：
Therefore phase noise is：
2nd, phase noise is compensated.
The output optical signal of frequency swept laser is by the signal direct ratio that OFDR is obtained：
Wherein τ is the round-trip delay of testing fiber, and R (τ) is that testing fiber is rear to Rayleigh scattering at τ in round-trip delay
Rate, TmIt is the round-trip delay of farthest measurement distance.
As shown in figure 3, the trace diagram at the testing fiber tail end pip measured for OFDR.It can be seen that due to phase
The influence of noise, should be that the pip trace of spike becomes Lorentz figure.
ε (t) can be obtained by previous step, e (t)=e is made-jε(t), make S1(t)=S (t) e (t), to S1T () carries out Fourier's change
Change：
Introduce residual video phase exp (j π f2/ γ), it is changed into：
Above φ C1、φC2It is stationary phase.OrderThen：
Inverse Fourier transform is done to it：
IfInverse Fourier transform be eRVP(f), order：
This is the signal after compensation, and its frequency spectrum is the reflective traces 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 optical signal of laser output is divided into two-way by polarization-maintaining photo-coupler, by different delays,
Coupled by 90 degree of mixing photo-couplers again；90 degree of photo-coupler outputs are received by two consistent differential couplers of parameter；Data
Capture card gathers the output of difference photodetector, and carries out data processing to the data that data collecting card is gathered, and obtains light letter
Number relative phase information, this be the phase noise of laser time domain reflection；If necessary to compensation coherent system, then will be relevant
System and data above synchronized sampling, the data to be compensated of synchronous acquisition reflect knot with the time domain of the phase noise of the laser for obtaining
Fruit carries out algorithm process together, and result is phase noise compensation result.
Specific embodiment of the invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can within the scope of the claims make various deformations or amendments, this not shadow
Sound substance of the invention.
Claims (6)
1. it is a kind of to be based on matching delay sampled light coherent system, it is characterised in that including laser, the first photo-coupler, optical frequency
Domain reflectometer measuring system and measurement and compensation system, the laser form first via output end by the first photo-coupler
With the second tunnel output end, wherein, the first via output end is connected with the input of optical frequency domain reflectometer measuring system, described
Second tunnel output end is connected with measurement with the input of the second photo-coupler of compensation system；
The measurement and compensation system, it is characterised in that including the second photo-coupler, 90 degree of mixing photo-coupler and difference light
Electric explorer, optical signal forms the 3rd tunnel output end and the 4th tunnel output end, the 3rd tunnel by second photo-coupler
Output end is connected by polarization maintaining optical fibre with first input of 90 degree of mixing photo-couplers, and by 90 degree of mixing photo-couplers
The 5th tunnel output end output, the 4th tunnel output end is directly connected with 90 degree second inputs for mixing photo-couplers
Connect, and by 90 degree of the 6th tunnel output end outputs of mixing photo-couplers, the difference photodetector includes the first difference photoelectricity
Detector and the second difference photodetector, the 5th tunnel output end are connected with the input of the first difference photodetector
Connect, the 6th tunnel output end is connected with the input of the second difference photodetector, and by two difference photodetectors
Output end output；
It is described based on matching delay sampled light coherent system, also including data collecting card and computer, the optical frequency domain reflectometer
Two output ends of difference photodetector of the output end of measuring system and measurement and compensation system are and data collecting card
Input be connected, the output end of the data collecting card is connected with computer；
The measurement and compensation, specifically：
The optical signal of laser output is divided into first via optical signal and the second road optical signal by the first photo-coupler, wherein, the
Optical signal is exported by after optical frequency domain reflectometer measurement all the way, and the second road optical signal is divided into the 3rd road light by the second photo-coupler
Signal and the 4th road optical signal, wherein, the 3rd road optical signal is input to 90 degree the first of mixing photo-coupler by polarization maintaining optical fibre
Individual input, the 4th road optical signal is directly inputted to 90 degree of second inputs of mixing photo-coupler；
The optical signal of 90 degree of the 5th tunnel output ends and the 6th tunnel output end for mixing photo-coupler is separately input to difference light electrical resistivity survey
Survey in the input of device；
The electric signal of difference photodetector output end output is input to the input of data collecting card with first via optical signal jointly
End, synchronously carries out data acquisition；
The data received to data collecting card carry out data processing, obtain the phase of the relative phase information of optical signal, i.e. laser
The time domain reflection of position noise；
The first via optical signal of synchronous acquisition is data to be compensated, is led to together with the relative phase information data of the optical signal for obtaining
Cross computer to be processed, that is, obtain phase noise compensation result.
2. it is according to claim 1 based on matching delay sampled light coherent system, it is characterised in that the 5th tunnel output
End and the 6th tunnel output end have two output ports respectively, and correspondingly, each difference photodetector is equipped with two inputs
Port.
3. it is according to claim 1 based on matching delay sampled light coherent system, it is characterised in that two difference light electrical resistivity surveys
The parameter for surveying device is consistent.
4. it is according to claim 1 based on matching delay sampled light coherent system, it is characterised in that second optical coupling
Two ways of optical signals propagation delay time difference and data acquisition between the Coupling point of device and 90 degree of Coupling points of mixing photo-coupler
The sampling period of card is equal.
5. it is according to claim 1 based on matching delay sampled light coherent system, it is characterised in that 90 degree of mixed lights
First input signal of input of coupler is S, and second input signal of input is L, then, and 90 degree of mixing optical couplings
The signal of two ports output of the tunnel output end of device the 5th is respectively S+L, S-L, 90 degree of mixing tunnel output ends of photo-coupler the 6th
Two ports output signal be respectively S+jL, S-jL, wherein, j is imaginary unit.
6. it is according to claim 1 based on matching delay sampled light coherent system, it is characterised in that described to data acquisition
The data that clamping is received carry out data processing, specially：The data that the input port of the first difference photodetector is collected
Used as real part, the data that the input port of the second difference photodetector is collected obtain one group and answer as imaginary part
Number data, ask for its phase, and phase is added up one by one, that is, obtain the phase information on laser temporal.
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| 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 |
| CN107889243B (en) * | 2016-09-30 | 2022-01-28 | 华为技术有限公司 | Data transmission method, related device and system |
| 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 |
| 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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| CN101207444A (en) * | 2006-12-15 | 2008-06-25 | 富士通株式会社 | Coherent optical receiver |
| CN102440762A (en) * | 2011-09-13 | 2012-05-09 | 深圳沃夫特影像技术有限公司 | Method and system for stabilizing frequency by interference phase parameter calibration feedback regulation and control |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101207444A (en) * | 2006-12-15 | 2008-06-25 | 富士通株式会社 | Coherent optical receiver |
| CN102440762A (en) * | 2011-09-13 | 2012-05-09 | 深圳沃夫特影像技术有限公司 | Method and system for stabilizing frequency by interference phase parameter calibration feedback regulation and control |
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