CN106301553B - Determine interferometer both arms time delayed difference value method, OSNR Monitoring Method and device - Google Patents
Determine interferometer both arms time delayed difference value method, OSNR Monitoring Method and device Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- 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 embodiment of the present invention provides a kind of method and device of determining interferometer both arms time delayed difference value and the monitoring method and device of optical signal to noise ratio, and the method for the determining interferometer both arms time delayed difference value includes：Inverse Fourier transform is carried out by preset power spectral density function corresponding to Wave decomposing multiplexer, determines the power spectral density function corresponding normalized autocorrelation functions curve in two-dimensional Cartesian coordinate system；Determine the normalized autocorrelation functions curve and crosspoint nearest apart from coordinate origin in the two-dimensional Cartesian coordinate system straight line y=0；The corresponding x-axis coordinate value in the crosspoint is determined as the interferometer both arms time delayed difference value.The accuracy of interferometry monitoring optical signal to noise ratio can be improved using the embodiment of the present invention and expands the effective range of interferometry monitoring optical signal to noise ratio.
Description
Technical field
The present invention relates to the technical field of optical-fiber network transmission, especially a kind of methods of determining interferometer both arms time delayed difference value
And the monitoring method and device of device and optical signal to noise ratio.
Background technology
With continuing to bring out for large-scale data center and cloud calculation service, optical-fiber network is developed rapidly.It is relatively traditional
The static network parameter configuration of network, optical-fiber network can be according to optical information networks (Optical Performance
Monitoring, OPM) perform dynamic compensation, selection routing and the operations such as resource distribution, effectively reduce the construction of optical-fiber network
And O＆M cost.And optical signal to noise ratio (OSNR-Optical Signal Noise Ratio, OSNR) is most basic in OPM
Transmission impairment index can intuitively reflect the overall performance of network.
In existing a variety of OSNR monitoring methods, interferometry is one of which effect preferably and using relatively broad
OSNR monitoring methods.Specifically, interferometry can distinguish signal and noise using coherence, due to the phase of signal and noise
Dry characteristic is not easy by dispersion (Chromatic Dispersion, CD), polarizing coating dispersion (Polarization Mode
Dispersion, PMD) and noise the factors such as degree of polarization influence so that the OSNR that interferometry monitors is more accurate.
In practical applications, interferometry is to be demultiplexed using the OSNR monitorings system based on interferometry, measurement band noise signal by wavelength-division
With the peak power output and minimum output power after device and interferometer, and then the OSNR with noise signal is generated, wherein, interference
Instrument can be specifically Mach-Zender interferometer (Mach-Zehnder interferometer, MZI).
Since interferometer both arms time delayed difference value has a significant impact, but mesh for the OSNR accuracys monitored and effective range
It is preceding for interferometer both arms time delayed difference value still not can foundation selection principle, accordingly, it is determined that suitable interferometer both arms delay
Difference is the key that ensure OSNR monitoring quality.
Invention content
The embodiment of the present invention be designed to provide a kind of method and device of determining interferometer both arms time delayed difference value and
The monitoring method and device of OSNR, with the effective range for improving the accuracy of monitoring OSNR and expanding monitoring OSNR.
In order to achieve the above objectives, the embodiment of the invention discloses a kind of method of determining interferometer both arms time delayed difference value, institutes
The method of stating includes：Inverse Fourier transform is carried out by preset power spectral density function corresponding to Wave decomposing multiplexer, is determined
The power spectral density function corresponding normalized autocorrelation functions curve in two-dimensional Cartesian coordinate system；Determine the normalization
Auto-correlation function curve and crosspoint nearest apart from coordinate origin in the two-dimensional Cartesian coordinate system straight line y=0；By described in
The corresponding x-axis coordinate value in crosspoint is determined as the interferometer both arms time delayed difference value.
Preferably, the Wave decomposing multiplexer connects a spectrometer, obtains the wavelength-division demultiplexing as follows
The corresponding preset power spectral density function of device：The corresponding power spectral density of the Wave decomposing multiplexer is obtained by the spectrometer
Function.
Preferably, it is described that Fourier's inversion is carried out by preset power spectral density function corresponding to Wave decomposing multiplexer
It changes, determines the power spectral density function in two-dimensional Cartesian coordinate system the step of corresponding normalized autocorrelation functions curve,
Including：By carrying out inverse Fourier transform to the preset power spectral density function, the preset power spectral density is generated
The corresponding auto-correlation function of function；The auto-correlation function is normalized, obtains normalized autocorrelation functions；According to
The normalized autocorrelation functions determine the corresponding normalization of the normalized autocorrelation functions certainly in two-dimensional Cartesian coordinate system
Correlation function curve.
The embodiment of the invention discloses a kind of monitoring method of optical signal to noise ratio, applied to the optical signal to noise ratio based on interferometry
OSNR monitors system, and the OSNR monitoring systems based on interferometry include an interferometer and a power meter, the method
Including：Interferometer in the OSNR monitorings system receives the band noise signal by Wave decomposing multiplexer filtering；The interferometer
Interferometer both arms time delayed difference value carries out interference processing to the band noise signal received according to determined by claim 1,
And processing is adjusted to the phase difference of the noise signal, by treated, band noise signal is sent to power meter；The work(
Rate meter receives the band noise signal by interferometer processing, and according to the phase difference of the noise signal, measures the band
The peak power output and minimum output power of noise signal；According to the interferometer both arms time delayed difference value, the maximum output
Power and the minimum output power monitor the OSNR with noise signal.
Preferably, it is described according to the interferometer both arms time delayed difference value, the peak power output and the minimum output
The step of power, the monitoring OSNR with noise signal, including：According to the interferometer both arms time delayed difference value, noise is determined
Auto-correlation function value；According to the auto-correlation function value of the noise, the peak power output and the minimum output power,
The OSNR with noise signal is calculated using equation below：
Wherein, OSNR is the optical signal to noise ratio with noise signal, For the band noise signal
Peak power output after Wave decomposing multiplexer and the interferometer successively,Pass through successively for the band noise signal
Minimum output power after the Wave decomposing multiplexer and the interferometer, a are the peak power outputWith it is described most
Small output powerThe ratio between, γsigFor the auto-correlation function value of the corresponding signal, γASEFor the Wave decomposing multiplexer
The auto-correlation function value of corresponding noise, NEB are the equivalent bandwidth of the Wave decomposing multiplexer, and nm is length unit nanometer.
The embodiment of the invention discloses a kind of device of determining interferometer both arms time delayed difference value, described device includes：First
Determination unit for carrying out inverse Fourier transform by predetermined power spectral density function corresponding to Wave decomposing multiplexer, determines
The power spectral density function corresponding normalized autocorrelation functions curve in two-dimensional Cartesian coordinate system；Second determination unit,
For determining the normalized autocorrelation functions curve and straight line y=0 in the two-dimensional Cartesian coordinate system apart from coordinate origin
Nearest crosspoint；Third determination unit, for the corresponding x-axis coordinate value in the crosspoint to be determined as the interferometer both arms
Time delayed difference value.
Preferably, the Wave decomposing multiplexer connects a spectrometer, and described device further includes：Acquiring unit；It is described to obtain
Unit is taken, for obtaining the corresponding power spectral density function of the Wave decomposing multiplexer by the spectrometer.
Preferably, first determination unit, including：It generates subelement, obtain subelement and determination subelement；The life
Into subelement, for by carrying out inverse Fourier transform to the preset power spectral density function, generating the preset work(
The corresponding auto-correlation function of rate spectral density function；The acquisition subelement, for place to be normalized to the auto-correlation function
Reason obtains normalized autocorrelation functions；The determination subelement, for according to the normalized autocorrelation functions, two-dimentional straight
The corresponding normalized autocorrelation functions curve of the normalized autocorrelation functions is determined in angular coordinate system.
The embodiment of the invention discloses a kind of monitoring device of optical signal to noise ratio, applied to the optical signal to noise ratio based on interferometry
OSNR monitors system, and the OSNR monitoring systems based on interferometry include an interferometer and a power meter, described device
Including：Receiving unit, processing unit, measuring unit and monitoring unit；The receiving unit, in OSNR monitorings system
Interferometer receives the band noise signal by Wave decomposing multiplexer filtering；The processing unit, for the interferometer according to power
Profit requires interferometer both arms time delayed difference value determined by 6 to carry out interference processing, and to institute to the band noise signal received
The phase difference for stating noise signal is adjusted processing, and by treated, band noise signal is sent to power meter；The measuring unit,
The band noise signal by interferometer processing is received, and according to the phase difference of the noise signal for the power meter,
Measure the peak power output and minimum output power with noise signal；The monitoring unit, for according to the interference
Instrument both arms time delayed difference value, the peak power output and the minimum output power monitor the OSNR with noise signal.
Preferably, the monitoring unit, including：Determination subelement and computation subunit；The determination subelement, for root
According to the interferometer both arms time delayed difference value, the auto-correlation function value of noise is determined；The computation subunit, for according to the letter
Number auto-correlation function value, the peak power output and the minimum output power, be calculated using equation below described
OSNR with noise signal：
Wherein, OSNR is the optical signal to noise ratio with noise signal, For the band noise signal
Peak power output after Wave decomposing multiplexer and the interferometer successively,Pass through successively for the band noise signal
Minimum output power after the Wave decomposing multiplexer and the interferometer, a are the peak power outputWith it is described most
Small output powerThe ratio between, γsigFor the auto-correlation function value of corresponding signal, γASEAuto-correlation letter for corresponding noise
Numerical value, NEB are the equivalent bandwidth of the Wave decomposing multiplexer, and nm is length unit nanometer.
As seen from the above technical solutions, the method for determining interferometer both arms time delayed difference value provided in an embodiment of the present invention and
The monitoring method and device of device and OSNR can compose corresponding normalization by the channel transmission power of Wave decomposing multiplexer certainly
Correlation function curve determines crosspoints of the normalized autocorrelation functions curve and function y=0 in two-dimensional Cartesian coordinate system, into
And the corresponding x-axis coordinate value in crosspoint nearest apart from coordinate origin in crosspoint is determined as interferometer both arms time delayed difference value.
In this way, can not only improve the accuracy using interferometry monitoring OSNR, but also the effective of interferometry monitoring OSNR can be expanded
Range.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of flow chart of the determining interferometer both arms time delayed difference value method of the embodiment of the present invention；
Fig. 2 is a kind of schematic diagram of power spectral density function in the embodiment of the present invention；
Fig. 3 is the corresponding normalized autocorrelation functions curve of a kind of power spectral density function in the embodiment of the present invention；
Fig. 4 is the schematic diagram of a kind of normalized autocorrelation functions curve in the embodiment of the present invention and straight line y=0；
Fig. 5 is a kind of flow chart of the OSNR monitoring methods of the embodiment of the present invention；
Fig. 6 is the structure chart that the wavelength-division multiplex system in the embodiment of the present invention and the OSNR based on interferometry monitor system；
Fig. 7 is another flow chart of the determining interferometer both arms time delayed difference value method of the embodiment of the present invention；
Fig. 8 is the normalized autocorrelation functions curve of the embodiment of the present invention and another schematic diagram of straight line y=0；
Fig. 9 is a kind of structure chart of the determining interferometer both arms time delayed difference value device of the embodiment of the present invention；
Figure 10 is a kind of structure chart of the OSNR monitoring devices of the embodiment of the present invention；
Figure 11 is another structure chart of the determining interferometer both arms time delayed difference value device of the embodiment of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
Embodiment of the method one
The embodiment of the invention discloses a kind of method and devices of determining interferometer both arms time delayed difference value.
Referring to Fig. 1, Fig. 1 is a kind of flow chart of the determining interferometer both arms time delayed difference value method of the embodiment of the present invention, is wrapped
Include following steps：
Step 101, inverse Fourier transform is carried out by preset power spectral density function corresponding to Wave decomposing multiplexer,
Determine the power spectral density function corresponding normalized autocorrelation functions curve in two-dimensional Cartesian coordinate system；
Specifically, it is necessary first to which to Wave decomposing multiplexer, corresponding preset power spectral density function carries out Fourier's inversion
It changes, and then obtains the power spectral density function corresponding normalized autocorrelation functions curve in two-dimensional Cartesian coordinate system.Its
In, the curve graph of the power spectral density function is as shown in Fig. 2, in fig. 2, x-axis coordinate representation signal bandwidth, y-axis coordinates table
Show the corresponding power spectral density function of Wave decomposing multiplexer.The corresponding normalized autocorrelation functions curve of power spectral density function is such as
Shown in Fig. 3, the x-axis coordinate representation interferometer both arms time delayed difference value in Fig. 3, y-axis coordinate representation power spectral density function is corresponding
Normalized autocorrelation functions.
In practical applications, Wave decomposing multiplexer is generally in wavelength-division multiplex (Wavelength Division
Multiplexing, WDM) in system.
Step 102, determine the normalized autocorrelation functions curve with straight line y=0 in the two-dimensional Cartesian coordinate system
The crosspoint nearest apart from coordinate origin；
Specifically, straight line y=0 can be drawn in the two-dimensional Cartesian coordinate system where normalized autocorrelation functions curve,
And then the crosspoint of normalized autocorrelation functions curve and straight line y=0 is obtained, as shown in figure 4, Fig. 4 is normalized autocorrelation letter
The schematic diagram of number curve and straight line y=0；Wherein, x-axis coordinate representation interferometer both arms time delayed difference value, y-axis coordinate representation channel work(
Rate composes corresponding normalized autocorrelation functions, the crosspoint of normalized autocorrelation functions curve and straight line y=0 include (Δ τ 1,
0), (Δ τ 2,0) and (Δ τ 3,0) etc., the normal conditions undercrossing point are multiple.It should be understood that the corresponding y-axis in multiple crosspoints
Coordinate value is 0, that is to say, that the value of the corresponding normalized autocorrelation functions in multiple crosspoints is 0.
Step 103, the corresponding x-axis coordinate value in the crosspoint is determined as the interferometer both arms time delayed difference value.
It specifically, in embodiments of the present invention, can be by crosspoint (Δ τ 1,0) the corresponding x nearest apart from coordinate origin
Axial coordinate value is determined as interferometer both arms time delayed difference value.
The embodiment of the present invention can be adapted for monitoring the OSNR with noise signal using interferometry, wherein, interferometer is specific
Can be MZI.
It should be noted that since interferometry can distinguish signal and noise using coherence, in the present invention
In embodiment, effectively monitoring OSNR can be realized by weakening the coherence of noise.
In embodiments of the present invention, the corresponding power spectral density function of Wave decomposing multiplexer is to pass through wavelength-division in only noise
The power spectral density function that demultiplexer measures, therefore, the corresponding normalization of power spectral density function of Wave decomposing multiplexer is certainly
Correlation function can embody the coherence of noise.It specifically, can be by the way that normalized autocorrelation functions value corresponding be prolonged for 0
Time difference value realizes that the coherence of noise is most weak as interferometer both arms time delayed difference value.It should be understood that enable normalized autocorrelation
Corresponding time delayed difference value can make the normalized autocorrelation functions of noise as interferometer both arms time delayed difference value when functional value is 0
It is 0 to be worth, and realizes the minimum of noise coherence.
As it can be seen that this makes it possible to the accuracys and effective monitoring scope that improve interferometry monitoring OSNR.
In one preferred embodiment of the invention, Wave decomposing multiplexer can connect a spectrometer, can specifically lead to
It crosses following steps and obtains the corresponding predetermined power spectral density function of Wave decomposing multiplexer：
The corresponding power spectral density function of the Wave decomposing multiplexer is obtained by the spectrometer.
Wherein, the power spectral density function is corresponding for Wave decomposing multiplexer when only noise passes through Wave decomposing multiplexer
Power spectral density function.It in practical applications, can if the corresponding power spectral density function of Wave decomposing multiplexer is known
To directly acquire and use.The acquisition modes of the present invention corresponding power spectral density function to Wave decomposing multiplexer are not limited
System.
It is described by the corresponding work(of the preset Wave decomposing multiplexer in another preferred embodiment of the present invention
Rate spectral density function carries out inverse Fourier transform, determines the corresponding normalized autocorrelation functions curve of the power spectral density function
The step of, including：
By carrying out inverse Fourier transform to the preset power spectral density function, the preset power spectrum is generated
Spend the corresponding auto-correlation function of function；
The auto-correlation function is normalized, obtains normalized autocorrelation functions；
According to the normalized autocorrelation functions, the normalized autocorrelation functions pair are determined in two-dimensional Cartesian coordinate system
The normalized autocorrelation functions curve answered.
Wherein it is possible to carry out inverse Fourier transform to power spectral density function using formula (1), power spectral density letter is obtained
The corresponding auto-correlation function of number：
In formula (1), Ps(f) it is power spectral density function, Rs(τ) is the corresponding auto-correlation letter of power spectral density function
Number, τ is time domain variable.
Auto-correlation function is normalized next, formula (2) may be used, obtains power spectral density function pair
The normalized autocorrelation functions answered：
Rs' (τ)=Rs(τ)/Rs(0) (2)
In formula (2), Rs(τ) be auto-correlation function, Rs(0) it is the corresponding auto-correlation function value as τ=0, Rs′(τ)
For normalized autocorrelation functions, τ is time domain variable.
In practical applications, it can be realized by existing computer program and normalization is obtained certainly by power spectral density function
The calculating process of correlation function, it is of course also possible to realize the calculating process by other means, the present invention is to by power spectrum
Degree function obtain normalized autocorrelation functions mode this do not limit.
As it can be seen that the embodiment of the present invention can be by the corresponding normalization of the power spectral density function of Wave decomposing multiplexer from phase
Function curve is closed, determines normalized autocorrelation functions curve and crosspoints of the straight line y=0 in two-dimensional Cartesian coordinate system, and then
The crosspoint corresponding x-axis coordinate value nearest apart from coordinate origin is determined as interferometer both arms time delayed difference value.Use the present invention
Embodiment the method obtains interferometer both arms delay inequality, can not only ensure that the OSNR's monitored using interferometry is accurate
Property, and the effective monitoring scope of OSNR can be made wider.
Embodiment of the method two
The embodiment of the present invention also proposed a kind of OSNR monitoring methods, and system is monitored applied to the OSNR based on interferometry,
The interferometer both arms time delayed difference value that can be obtained according to embodiment of the method one monitors OSNR.
Referring to Fig. 5, Fig. 5 is a kind of flow chart of the OSNR monitoring methods of the embodiment of the present invention, is included the following steps：
Step 501, the interferometer in the OSNR monitorings system receives the band noise letter by Wave decomposing multiplexer filtering
Number；
Under normal circumstances, Wave decomposing multiplexer is in wdm system, common wdm system and the OSNR based on interferometry
The structure of monitoring system is as shown in Figure 6.In figure 6, wdm system includes a Wave decomposing multiplexer, the OSNR based on interferometry
Monitoring system includes an interferometer and a power meter；Wherein, interferometer includes the both arms of interferometer and two 3dB are coupled
Device, the first arm in interferometer both arms can adjust the delay inequality of signal, and have phase tune on the second arm in interferometer both arms
Device processed can adjust the phase difference of signal；The direction that arrow marks in Fig. 6 is band noise signal in wdm system and based on interference
Transmission direction in the OSNR monitoring systems of method.Going out and being for explanation is also needed to, in embodiments of the present invention, interferometer specifically can be with
It is MZI.
In this step, with noise signal after the signal of pre-set bandwidths is filtered by Wave decomposing multiplexer, can enter
Interferometer in OSNR monitoring systems based on interferometry, will be with noise signal point by first three-dB coupler in interferometer
To enter the both arms of interferometer after two shunting signs.
Step 502, the interferometer believes the band noise received according to determining interferometer both arms time delayed difference value
Number interference processing is carried out, and processing is adjusted to the phase difference of the noise signal, it will treated that band noise signal is sent
To power meter；
In this step, the interferometer both arms time delayed difference value can Fig. 1 institutes in embodiment one in the method in accordance with the invention
The determining interferometer both arms time delayed difference value method shown determines.
Specifically, two shunting signs with noise signal can be made to pass through the both arms of interferometer respectively, according to determining
The time delayed difference value of first arm in interferometer both arms time delayed difference value setting interferometer both arms, makes to generate by the shunting sign of the first arm
Delay, and then generate delay inequality between two shunting signs so that noise passes through the phase after Wave decomposing multiplexer and interferometer
Dryness is most weak, so as to ensure the monitoring quality of OSNR.
At the same time it can also by the phase-modulator on the second arm in interferometer both arms, to being believed by the branch of the second arm
Number phase be adjusted, generate phase difference between two shunting signs；Wherein, the adjustment amplitude of phase difference needs to be more than 2
π could measure the peak power output with noise signal in power meterAnd minimum output power
Finally, second three-dB coupler receives interferometer both arms treated two shunting signs, by two shunting signs
Processing is merged, exports the band noise signal all the way after reconfiguring.
Step 503, the power meter receives the band noise signal by interferometer processing, and is believed according to the noise
Number phase difference, measure the peak power output and minimum output power with noise signal；
Specifically, the adjustment with noise signal phase difference can be handled according to the phase-modulator in step 502, by work(
The peak power output value and minimum output power value with noise signal that rate meter correspondence is measured.
Step 504, according to the interferometer both arms time delayed difference value, the peak power output and the minimum output work
Rate monitors the OSNR with noise signal.
It is described according to the interferometer both arms time delayed difference value, the maximum in the still another preferable embodiment of the present invention
The step of output power and minimum output power, the monitoring OSNR with noise signal, can specifically it include：
According to the interferometer both arms time delayed difference value, the auto-correlation function value of noise is determined；
According to the auto-correlation function value of the noise, the peak power output and the minimum output power, using such as
The OSNR with noise signal is calculated in lower formula：
Wherein, OSNR is the optical signal to noise ratio with noise signal, For the band noise signal
Peak power output after Wave decomposing multiplexer and the interferometer successively,Pass through successively for the band noise signal
Minimum output power after the Wave decomposing multiplexer and the interferometer, a are the peak power outputWith it is described most
Small output powerThe ratio between, γsigFor the auto-correlation function value of the corresponding signal of the Wave decomposing multiplexer, γASEFor the wave
The auto-correlation function value of the corresponding noise of decomposition multiplex device, NEB are the equivalent bandwidth of the Wave decomposing multiplexer, and nm is length list
Position nanometer.
By formula (3) it is found that the auto-correlation function value γ of noiseASEAccuracy and effectively inspection to interferometry monitoring OSNR
Surveying range has larger impact.In order to preferably distinguish noise and signal, need to make by Wave decomposing multiplexer and interferometer
The coherence of noise weakens as far as possible.And the corresponding normalized autocorrelation functions value of preset power spectral density function being capable of body
The coherence of existing noise.It should be understood that the auto-correlation function value γ of noiseASECloser 0, the OSNR monitored is more accurate,
The effective monitoring scope of OSNR is also wider.
It should be noted that since power spectral density function is only related with the pre-set bandwidths and shape of Wave decomposing multiplexer,
That is, for same Wave decomposing multiplexer, corresponding normalized autocorrelation functions curve be it is unique, therefore,
The auto-correlation function value γ of noise can be uniquely determined by interferometer both arms time delayed difference value Δ τASE.When time delayed difference value Δ τ's
During the corresponding x-axis coordinate value in crosspoint of the value between normalized autocorrelation functions curve and the straight line of straight line y=0, delay
The auto-correlation function value γ of the corresponding noises of difference DELTA τASEIt is zero.And the corresponding x-axis in the crosspoint nearest apart from coordinate origin is sat
Scale value is the minimum value in the corresponding x-axis coordinate value in all crosspoints, and the minimum value is determined as by the embodiment of the present invention
Interferometer both arms time delayed difference value Δ τ.This is because compared with other crosspoints, obtained according to the crosspoint nearest apart from coordinate origin
To time delayed difference value Δ τ the effective monitoring scope of OSNR can be made wider, monitoring result error smaller, in contrast, according to away from
It is unstable that the time delayed difference value obtained from the crosspoint of coordinate origin farther out may result in OSNR Monitoring Performances.
Therefore, in embodiments of the present invention, for same Wave decomposing multiplexer, interferometer both arms delay inequality can be passed through
Value Δ τ uniquely determines the auto-correlation function value γ of noiseASE, specifically, take the auto-correlation function value γ for enabling to noiseASEFor
Minimum value in 0 time delayed difference value is as interferometer both arms time delayed difference value Δ τ so that the OSNR errors calculated are minimum, effectively
Monitoring range is most wide.
For passing through the parameters in formula (3), it is also necessary to which further explanation is：
In order to calculate the OSNR with noise signal, the auto-correlation function value γ in addition to determining noiseASEExcept, it is also necessary to
Determine the auto-correlation function value γ of the corresponding signal of Wave decomposing multiplexersigWith the equivalent bandwidth NEB of Wave decomposing multiplexer and
It measures and passes through the peak power output after Wave decomposing multiplexer and interferometer with noise signalAnd minimum output powerWherein,WithValue can be measured by the power meter in the OSNR monitorings system, NEB
Value for parameter preset, therefore can also directly acquire, and the auto-correlation function value γ of signalsigValue can by with
Lower method obtains：
Signal is sequentially input into Wave decomposing multiplexer and OSNR based on interferometry monitors system, by interferometer both arms
Phase-modulator the phase difference of signal is adjusted, obtain signal successively after Wave decomposing multiplexer and interferometer most
Big output powerAnd minimum output powerPass through the auto-correlation function value γ of signal againsigCalculation formula, it is such as public
Shown in formula (4), the auto-correlation function value γ of signal is obtainedsig：
Certainly, if the auto-correlation function value γ of the corresponding signal of Wave decomposing multiplexersigIt, then can be direct to be known
It obtains and uses, without recalculating again, the present invention is to the auto-correlation function value γ of signalsigAcquisition modes do not limit.
In addition, the derivation of the calculation formula for OSNR, as shown in formula (3), it is also necessary to which explanation is：
The output power of noiseCalculation formula such as formula (6) shown in：
In formula (6), γASEFor the auto-correlation function value of noise,For the phase difference of noise, loss is monitored for OSNR
The inherent loss of system,Input power for noise.
The output power of signalCalculation formula such as formula (7) shown in：
In formula (7), γsigAuto-correlation function value for signal；For the phase difference of signal, loss is monitored for OSNR
The inherent loss of system,Input power for signal.
It can be obtained by formula (6) and formula (7), the gross output P with noise signaloutCalculation formula such as formula (8) institute
Show：
In formula (8),
Next, by phase-modulator to shunting sign all the way into horizontal phasing control, the variable quantity for making phase adjustment is big
In 2 π, to obtain the peak power output with noise signalAnd minimum output powerSpecifically, by phase adjustment
When being spent for π,
During by phase adjustment for 0 or 2 π,
Since OSNR refers to that in effective bandwidth be the ratio of optical signal power and noise power in 0.1nm.Therefore, by public affairs
Formula (9) and formula (10) can derive the calculation formula of OSNR, as shown in formula (11)：
In formula (11), For band noise
Peak power output of the signal after Wave decomposing multiplexer and interferometer,Pass through Wave decomposing multiplexer for band noise signal
With the minimum output power after interferometer.It should be understood that formula (11) is identical with formula (3) essence, only expression-form is not
Together.
It, being capable of scheme described in embodiment one determines according to the method for the present invention interferometer as it can be seen that in embodiments of the present invention
Both arms time delay value and the band noise signal that systematic survey goes out is monitored by OSNR based on interferometry pass through Wave decomposing multiplexer
Peak power output and minimum output power with after interferometer, are calculated OSNR, by one institute of the method for the present invention embodiment
The auto-correlation function value γ of the corresponding noise of interferometer both arms time delay value that the scheme of stating determinesASEIt is 0 so that the error of OSNR values
Minimum, so as to ensure the accuracy of OSNR monitoring results and effective monitoring scope.
Embodiment of the method three
The present embodiment is illustrated on the basis of above method embodiment one according to the corresponding power of Wave decomposing multiplexer
Spectral density function determines the detailed process of interferometer both arms time delayed difference value.Referring to Fig. 7, Fig. 7 is the determining dry of the embodiment of the present invention
Another flow chart of interferometer both arms time delayed difference value method, includes the following steps：
Step 701, the corresponding power spectral density function curve of Wave decomposing multiplexer is obtained by spectrometer；
Step 702, by carrying out inverse Fourier transform to the preset power spectral density function, generation is described preset
The corresponding auto-correlation function of power spectral density function；
Step 703, the auto-correlation function is normalized, obtains normalized autocorrelation functions curve；
Step 704, according to the normalized autocorrelation functions, determine the normalization from phase in two-dimensional Cartesian coordinate system
Close the corresponding normalized autocorrelation functions curve of function；
Step 705, determine the normalized autocorrelation functions curve with straight line y=0 in the two-dimensional Cartesian coordinate system
The crosspoint nearest apart from coordinate origin；
Specifically, the crosspoint nearest apart from coordinate origin as described in Figure 8, Fig. 8 for normalized autocorrelation functions curve with
Another schematic diagrames of the straight line y=0 in two-dimensional Cartesian coordinate system, close three nearer crosspoints of coordinate origin are respectively
(14,0), (27,0) and (40,0), wherein, the crosspoint nearest apart from coordinate origin is (14,0).
Step 706, the corresponding x-axis coordinate value in the crosspoint is determined as the interferometer both arms time delayed difference value.
It specifically, in embodiments of the present invention, can be by the crosspoint of normalized autocorrelation functions curve and straight line y=0
(14,0) corresponding x-axis coordinate value 14 is determined as interferometer both arms time delayed difference value, since the unit of x-axis is picosecond, that is to say, that
Interferometer both arms time delayed difference value Δ τ=14ps.
As it can be seen that in embodiments of the present invention, the corresponding power spectral density letter of Wave decomposing multiplexer is obtained by spectrometer first
Number curve, then inverse Fourier transform is carried out to power spectral density function and obtains corresponding normalized autocorrelation functions curve, and then
The crosspoint of normalized autocorrelation functions curve and straight line y=0 is obtained, and determines that the crosspoint nearest apart from coordinate origin corresponds to
X-axis coordinate value be interferometer both arms time delayed difference value.Thus obtained time delayed difference value can improve the OSNR that interferometry monitors
Accuracy rate and expand OSNR effective monitoring scope.
Device embodiment one
Referring to Fig. 9, Fig. 9 is a kind of structure chart of the determining interferometer both arms time delayed difference value device of the embodiment of the present invention, should
Device is corresponding with method flow shown in FIG. 1, can specifically include with lower unit：
First determination unit 901, for carrying out Fu by predetermined power spectral density function corresponding to Wave decomposing multiplexer
In leaf inverse transformation, determine that the power spectral density function corresponding normalized autocorrelation functions in two-dimensional Cartesian coordinate system are bent
Line；
Second determination unit 902, for determining the normalized autocorrelation functions curve with straight line y=0 in the two dimension
The crosspoint nearest apart from coordinate origin in rectangular coordinate system；
Third determination unit 903 is prolonged for the corresponding x-axis coordinate value in the crosspoint to be determined as the interferometer both arms
Time difference value.
In a kind of alternative embodiment of the present invention, the Wave decomposing multiplexer connects a spectrometer, and described device is also
Including：Acquiring unit；
The acquiring unit, for obtaining the corresponding power spectral density letter of the Wave decomposing multiplexer by the spectrometer
Number.
In another alternative embodiment of the present invention, first determination unit 901, including：It generates subelement, obtain
Subelement and determination subelement；
The generation subelement, for by carrying out inverse Fourier transform, life to the preset power spectral density function
Into the corresponding auto-correlation function of the preset power spectral density function；
The acquisition subelement for the auto-correlation function to be normalized, obtains normalized autocorrelation letter
Number；
The determination subelement, for according to the normalized autocorrelation functions, institute to be determined in two-dimensional Cartesian coordinate system
State the corresponding normalized autocorrelation functions curve of normalized autocorrelation functions.
As it can be seen that the embodiment of the present invention can be by the corresponding normalization of the power spectral density function of Wave decomposing multiplexer from phase
Function curve is closed, determines normalized autocorrelation functions curve and crosspoints of the straight line y=0 in two-dimensional Cartesian coordinate system, and then
The crosspoint corresponding x-axis coordinate value nearest apart from coordinate origin is determined as interferometer both arms time delayed difference value.Use the present invention
Embodiment the method obtains interferometer both arms delay inequality, can not only ensure that the OSNR's monitored using interferometry is accurate
Property, and the effective monitoring scope of OSNR can be made wider.
Device embodiment two
Referring to Figure 10, Figure 10 is a kind of structure chart of the OSNR monitoring devices of the embodiment of the present invention, shown in the device and Fig. 5
Method flow it is corresponding；Wherein, the monitoring device of OSNR is applied to the OSNR monitoring systems based on interferometry, based on interferometry
OSNR monitoring system include an interferometer and a power meter.The monitoring device of the OSNR can specifically include following
Unit：
Receiving unit 1001 receives the band by Wave decomposing multiplexer filtering for the interferometer in OSNR monitorings system
Noise signal；
Processing unit 1002, for the interferometer according to determined by claim 1 interferometer both arms time delayed difference value pair
The band noise signal received carries out interference processing, and is adjusted processing to the phase difference of the noise signal, will locate
Band noise signal after reason is sent to power meter；
Measuring unit 1003, for band noise signal of the power meter reception by interferometer processing, and according to
The phase difference of the noise signal measures the peak power output and minimum output power with noise signal；
Monitoring unit 1004, for according to the interferometer both arms time delayed difference value, the peak power output and it is described most
Small output power monitors the OSNR with noise signal.
In a kind of alternative embodiment of the present invention, the monitoring unit 1004, including：Determination subelement and calculating are single
Member；
The determination subelement, for according to the interferometer both arms time delayed difference value, determining the auto-correlation function value of noise；
The computation subunit, for according to the noise auto-correlation function value, the peak power output and described
The OSNR with noise signal is calculated using equation below in minimum output power：
Wherein, OSNR is the optical signal to noise ratio with noise signal, For the band noise signal
Peak power output after Wave decomposing multiplexer and the interferometer successively,Pass through successively for the band noise signal
Minimum output power after the Wave decomposing multiplexer and the interferometer, a are the peak power outputWith it is described most
Small output powerThe ratio between, γsigFor the auto-correlation function value of the corresponding signal of the Wave decomposing multiplexer, γASEFor the wave
The auto-correlation function value of the corresponding noise of decomposition multiplex device, NEB are the equivalent bandwidth of the Wave decomposing multiplexer, and nm is length list
Position nanometer.
As it can be seen that in embodiments of the present invention, the interferometer that can be determined according to one described device of apparatus of the present invention embodiment
Both arms time delay value and the band noise signal that systematic survey goes out is monitored by OSNR based on interferometry pass through Wave decomposing multiplexer
Peak power output and minimum output power with after interferometer, are calculated OSNR, by one institute of apparatus of the present invention embodiment
State the auto-correlation function value γ of the corresponding noise of interferometer both arms time delay value that device determinesASEIt is 0 so that the error of OSNR values
Minimum, so as to ensure the accuracy of OSNR monitoring results and effective monitoring scope.
Device embodiment three
Referring to Figure 11, Figure 11 is another structure of the determining interferometer both arms time delayed difference value device of the embodiment of the present invention
Figure, the device is corresponding with method flow shown in Fig. 7, which includes：Acquiring unit 1101, the first determination unit 1102,
Second determination unit 1103 and third determination unit 1104；Wherein, the second determination unit shown in second determination unit 1103 and Fig. 9
902 can be identical, and third determination unit 1104 can be identical with third determination unit shown in Fig. 9 903, here no longer
It repeats.
The acquiring unit 1101, for obtaining the corresponding power spectral density of the Wave decomposing multiplexer by the spectrometer
Function.
As shown in figure 11, the first determination unit 1102 in the present embodiment includes：Subelement 1105 is generated, obtains subelement
1106 and determination subelement 1107；
The generation subelement 1105, for by carrying out Fourier's inversion to the preset power spectral density function
It changes, generates the corresponding auto-correlation function of the preset power spectral density function；
The acquisition subelement 1106 for the auto-correlation function to be normalized, obtains normalization from phase
Close function；
The determination subelement 1107, for according to the normalized autocorrelation functions, in two-dimensional Cartesian coordinate system really
Determine the corresponding normalized autocorrelation functions curve of the normalized autocorrelation functions.
As it can be seen that in embodiments of the present invention, the corresponding power spectrum of Wave decomposing multiplexer can be obtained by spectrometer first
Function curve is spent, then inverse Fourier transform is carried out to power spectral density function and obtains corresponding normalized autocorrelation functions curve,
And then the crosspoint of normalized autocorrelation functions curve and straight line y=0 is obtained, and determine the crosspoint nearest apart from coordinate origin
Corresponding x-axis coordinate value is interferometer both arms time delayed difference value.Thus obtained time delayed difference value can improve what interferometry monitored
The accuracy rate of OSNR and the effective monitoring scope for expanding OSNR.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any this practical relationship or sequence.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only will including those
Element, but also including other elements that are not explicitly listed or further include as this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
Also there are other identical elements in process, method, article or equipment including the element.
Each embodiment in this specification is described using relevant mode, identical similar portion between each embodiment
Point just to refer each other, and the highlights of each of the examples are difference from other examples.Especially for system reality
For applying example, since it is substantially similar to embodiment of the method, so description is fairly simple, related part is referring to embodiment of the method
Part explanation.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (10)
- A kind of 1. method of determining interferometer both arms time delayed difference value, which is characterized in that the method includes：Inverse Fourier transform is carried out by preset power spectral density function corresponding to Wave decomposing multiplexer, determines the power Spectral density function corresponding normalized autocorrelation functions curve in two-dimensional Cartesian coordinate system；Determine the normalized autocorrelation functions curve and straight line y=0 in the two-dimensional Cartesian coordinate system apart from coordinate origin Nearest crosspoint；The corresponding x-axis coordinate value in the crosspoint is determined as the interferometer both arms time delayed difference value.
- 2. according to the method described in claim 1, it is characterized in that, the Wave decomposing multiplexer one spectrometer of connection, passes through Following steps obtain the corresponding preset power spectral density function of the Wave decomposing multiplexer：The corresponding power spectral density function of the Wave decomposing multiplexer is obtained by the spectrometer.
- 3. according to the method described in claim 1, it is characterized in that, described pass through preset work(corresponding to Wave decomposing multiplexer Rate spectral density function carries out inverse Fourier transform, determines that the power spectral density function is corresponding in two-dimensional Cartesian coordinate system and returns The step of one change auto-correlation function curve, including：By carrying out inverse Fourier transform to the preset power spectral density function, the preset power spectral density letter is generated The corresponding auto-correlation function of number；The auto-correlation function is normalized, obtains normalized autocorrelation functions；According to the normalized autocorrelation functions, determine that the normalized autocorrelation functions are corresponding in two-dimensional Cartesian coordinate system Normalized autocorrelation functions curve.
- 4. a kind of monitoring method of optical signal to noise ratio, which is characterized in that monitor system applied to the optical signal to noise ratio OSNR based on interferometry System, the OSNR monitoring systems based on interferometry include an interferometer and a power meter, the method includes：Interferometer in the OSNR monitorings system receives the band noise signal by Wave decomposing multiplexer filtering；Interferometer interferometer according to determined by the method for determining interferometer both arms time delayed difference value a kind of in claim 1 is double Arm time delayed difference value carries out interference processing to the band noise signal received, and the phase difference of the noise signal is adjusted Whole processing, by treated, band noise signal is sent to power meter；The power meter receives the band noise signal by interferometer processing, and according to the phase difference of the noise signal, Measure the peak power output and minimum output power with noise signal；According to the interferometer both arms time delayed difference value, the peak power output and the minimum output power, the band is monitored The OSNR of noise signal.
- 5. according to the method described in claim 4, it is characterized in that, it is described according to the interferometer both arms time delayed difference value, it is described The step of peak power output and minimum output power, the monitoring OSNR with noise signal, including：According to the interferometer both arms time delayed difference value, the auto-correlation function value of noise is determined；According to the auto-correlation function value of the noise, the peak power output and the minimum output power, using following public affairs The OSNR with noise signal is calculated in formula：Wherein, OSNR is the optical signal to noise ratio with noise signal, For the band noise signal successively Peak power output after Wave decomposing multiplexer and the interferometer,It is described in the band noise signal is passed through successively Minimum output power after Wave decomposing multiplexer and the interferometer, a are the peak power outputIt is defeated with the minimum Go out powerThe ratio between, γsigFor the auto-correlation function value of the corresponding signal of the Wave decomposing multiplexer, γASEFor the wavelength-division The auto-correlation function value of the corresponding noise of demultiplexer, NEB are the equivalent bandwidth of the Wave decomposing multiplexer, and nm is length unit Nanometer.
- 6. a kind of device of determining interferometer both arms time delayed difference value, which is characterized in that described device includes：First determination unit, for carrying out Fourier's inversion by predetermined power spectral density function corresponding to Wave decomposing multiplexer It changes, determines the power spectral density function corresponding normalized autocorrelation functions curve in two-dimensional Cartesian coordinate system；Second determination unit, for determining the normalized autocorrelation functions curve with straight line y=0 in the two-dimentional rectangular co-ordinate The crosspoint nearest apart from coordinate origin in system；Third determination unit, for the corresponding x-axis coordinate value in the crosspoint to be determined as the interferometer both arms time delayed difference value.
- 7. device according to claim 6, which is characterized in that the Wave decomposing multiplexer connects a spectrometer, described Device further includes：Acquiring unit；The acquiring unit, for obtaining the corresponding power spectral density function of the Wave decomposing multiplexer by the spectrometer.
- 8. device according to claim 6, which is characterized in that first determination unit, including：Generation subelement obtains Obtain subelement and determination subelement；The generation subelement, for by carrying out inverse Fourier transform to the preset power spectral density function, generating institute State the corresponding auto-correlation function of preset power spectral density function；The acquisition subelement for the auto-correlation function to be normalized, obtains normalized autocorrelation functions；The determination subelement, for according to the normalized autocorrelation functions, described return to be determined in two-dimensional Cartesian coordinate system One changes the corresponding normalized autocorrelation functions curve of auto-correlation function.
- 9. a kind of monitoring device of optical signal to noise ratio, which is characterized in that monitor system applied to the optical signal to noise ratio OSNR based on interferometry System, the OSNR monitoring systems based on interferometry include an interferometer and a power meter, described device include：It receives single Member, processing unit, measuring unit and monitoring unit；The receiving unit, the band received for the interferometer in the OSNR monitorings system by Wave decomposing multiplexer filtering are made an uproar Acoustical signal；The processing unit, for the interferometer according to the dress of determining interferometer both arms time delayed difference value a kind of in claim 6 Interferometer both arms time delayed difference value determined by putting carries out interference processing, and to the noise to the band noise signal received The phase difference of signal is adjusted processing, and by treated, band noise signal is sent to power meter；The measuring unit receives the band noise signal by interferometer processing, and according to described for the power meter The phase difference of noise signal measures the peak power output and minimum output power with noise signal；The monitoring unit, for defeated according to the interferometer both arms time delayed difference value, the peak power output and the minimum Go out power, monitor the OSNR with noise signal.
- 10. device according to claim 9, which is characterized in that the monitoring unit, including：Determination subelement and calculating Subelement；The determination subelement, for according to the interferometer both arms time delayed difference value, determining the auto-correlation function value of noise；The computation subunit, for auto-correlation function value, the peak power output and the minimum according to the signal The OSNR with noise signal is calculated using equation below in output power：Wherein, OSNR is the optical signal to noise ratio with noise signal, For the band noise signal successively Peak power output after Wave decomposing multiplexer and the interferometer,It is described in the band noise signal is passed through successively Minimum output power after Wave decomposing multiplexer and the interferometer, a are the peak power outputIt is defeated with the minimum Go out powerThe ratio between, γsigFor the auto-correlation function value of the corresponding signal of the Wave decomposing multiplexer, γASEFor the wavelength-division The auto-correlation function value of the corresponding noise of demultiplexer, NEB are the equivalent bandwidth of the Wave decomposing multiplexer, and nm is length unit Nanometer.
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