CN106130624B - A kind of method and apparatus of optical signal-to-noise ratio monitoring - Google Patents
A kind of method and apparatus of optical signal-to-noise ratio monitoring Download PDFInfo
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Abstract
The embodiment of the invention provides a kind of method and apparatus of optical signal-to-noise ratio monitoring, wherein the method for optical signal-to-noise ratio monitoring includes：Obtain the optical power spectrum density with din-light signal, the optical power spectrum density of noise, the optical power spectrum density without noise cancellation signal；Inverse Fourier transform respectively obtains the auto-correlation function with din-light signal light power spectrum density, the auto-correlation function of noise light power spectral density, the auto-correlation function without noise cancellation signal optical power spectrum density；Normalization respectively obtains the normalized autocorrelation functions with din-light signal light power spectrum density, the normalized autocorrelation functions of noise light power spectral density, the normalized autocorrelation functions without noise cancellation signal optical power spectrum density；By the first preset formula, the ratio of the power of power and noise without noise cancellation signal is determined；The optical signal to noise ratio with din-light signal is monitored by the second preset formula according to ratio.The present invention realizes a kind of simple possible, calculates the small optimal optical signal-to-noise ratio monitoring of magnitude.
Description
Technical field
The present invention relates to optical information networks technical fields, more particularly to a kind of method and apparatus of optical signal-to-noise ratio monitoring.
Background technique
In recent years, continuing to bring out with all kinds of large-scale data centers and cloud calculation service, optical-fiber network is in network flexibility
With development at full speed is obtained in terms of transmission capacity two.Network parameter configuration for existing network relative quiescent, network flexibility
Improve can significantly energy saving, enhance network reconfigurability, simplify network-based control and management, better adapt to
The current and following potential various applications, to be effectively reduced the construction and O&M cost of optical-fiber network.And network agile
Property and intelligence realization to be with the physical damnification characteristic for perceiving transmission link and switching node be support, need according to instant
Diagnostic signal damages to carry out the corresponding operation such as dynamic compensation, routing, resource distribution, therefore OPM (Optical
Performance Monitoring, optical information networks) it is the one of the prerequisite that active block flexibility is achieved.?
OPM all monitoring factor (such as OSNR (Optical Signal Noise Ratio, optical signal to noise ratio) monitoring, chromatic dispersion
Monitoring and PMD (Portable Multimedia Dictionary, polarizing coating dispersion) monitoring) in, OSNR is as most basic
Transmission impairment index directly affects and reflects the overall performance in network and is particularly important, it is therefore desirable to obtain effectively
Diagnosis and compensation.
OSNR is the critical performance parameters that BER (Bit Error Rate, error rate of system) is predicted in optic network.It uses
One spectroanalysis instrument can comparatively easy measure optical signal to noise ratio.Now, due to being based on ROADM (Reconfigurable
Optical Add-Drop Multiplexer, reconfigurable OADM) network appearance, there are many new surveys
Amount method.In existing OSNR monitoring technology, waveform sampling method is generated by signal generation device and noise generating device
Band din-light signal, erbium-doped fiber amplifier amplified signal, optical band pass filter filter out extra noise, and receiver receives band din-light
Signal, slow-type analog digital quantizer sample band din-light signal, and digital signal processing device is according to more complicated meter
Formula is calculated, obtains the value of different OSNR.In addition there are also a kind of method based on coherent reception, it is produced by complicated signal
Generating apparatus generates signal, generates noise by noise device, then by erbium-doped fiber amplifier amplified signal, band din-light signal is passed through
It crosses palarization multiplexing emulator simulation palarization multiplexing to monitor OSNR, later the making an uproar by attenuator control input with din-light signal
Sound finally passes through the coherent reception of OSNR monitor, carries out complicated operation and obtains different OSNR values.
It usually operates more complicated based on the OSNR monitoring that the above method is realized or needs using complicated algorithm.
Summary of the invention
The method and apparatus for being designed to provide a kind of optical signal-to-noise ratio monitoring of the embodiment of the present invention, to realize monitoring OSNR
Method, it is easy to operate, calculate easy.
In order to achieve the above objectives, the invention discloses a kind of methods of optical signal-to-noise ratio monitoring, including：
It is close to obtain the optical power spectrum density with din-light signal, the optical power spectrum density of noise, the optical power spectrum without noise cancellation signal
Degree, wherein the band din-light signal carries the noise and the no noise cancellation signal；
The optical power spectrum density of optical power spectrum density, the noise described in inverse Fourier transform with din-light signal and described
Optical power spectrum density without noise cancellation signal respectively obtains the auto-correlation function with din-light signal light power spectrum density, described makes an uproar
The auto-correlation function of the auto-correlation function of acousto-optic power spectral density and the no noise cancellation signal optical power spectrum density；
Normalize the auto-correlation function with din-light signal light power spectrum density, the noise light power spectral density from
It is close to respectively obtain band din-light signal light power spectrum for the auto-correlation function of correlation function and the no noise cancellation signal optical power spectrum density
The normalized autocorrelation functions of degree, the normalized autocorrelation functions of noise light power spectral density, without noise cancellation signal optical power spectrum density
Normalized autocorrelation functions；
According to the normalized autocorrelation functions with din-light signal light power spectrum density, the noise light power spectral density
Normalized autocorrelation functions, the no noise cancellation signal optical power spectrum density normalized autocorrelation functions, pass through the first default public affairs
Formula determines the ratio of the power of the no noise cancellation signal and the power of the noise；
The optical signal to noise ratio with din-light signal is monitored by the second preset formula according to the ratio.
Preferably, acquisition the optical power spectrum density with din-light signal, the optical power spectrum density of noise, without noise cancellation signal
Optical power spectrum density, including：
Obtaining has default band din-light signal of the fixed optical power spectrum without noise cancellation signal；
According to the band din-light signal, the noise in din-light signal and described in din-light signal is determined respectively
Without noise cancellation signal；
According to the band din-light signal, the noise and the no noise cancellation signal, the corresponding band din-light letter is obtained respectively
Number optical power spectrum density, the optical power spectrum density of the noise, the optical power spectrum density of the no noise cancellation signal.
Preferably, the optical power spectrum density of the acquisition with din-light signal, including：
Band din-light signal after repeatedly adjusting the noise with din-light signal, after being adjusted；
According to the band din-light signal adjusted, it is close repeatedly to obtain the optical power spectrum adjusted with din-light signal
Degree.
Preferably, the auto-correlation function with din-light signal light power spectrum density is：
Wherein, the Rsn(τ) is the auto-correlation function with din-light signal light power spectrum density, and the sn is the band
Din-light signal, the Psn(fsn) it is the optical power spectrum density with din-light signal, the fsnFor the frequency with din-light signal
Rate, the τ are delay variable, and the j is imaginary unit, and the e is natural logrithm, describedFor one about τ's
Function；
The normalized autocorrelation functions with din-light signal light power spectrum density are：
Wherein, the Rsn' (τ) be the normalized autocorrelation functions with din-light signal light power spectrum density, the sn
For the band din-light signal, the Psn(fsn) it is the optical power spectrum density with din-light signal, the fsnFor the band din-light
The frequency of signal, the τ are delay variable, and the j is imaginary unit, and the e is natural logrithm, describedIt makes an uproar for the band
The power of optical signal,ForIt is describedFor a function about τ.
Preferably, the auto-correlation function of the noise light power spectral density is：
Wherein, the Rn(τ) is the auto-correlation function of the noise light power spectral density, and the n is the noise, described
Pn(fn) be the noise optical power spectrum density, the fnFor the frequency of the noise, the τ is delay variable, and the j is
Imaginary unit, the e is natural logrithm, describedFor a function about τ；
The normalized autocorrelation functions of the noise light power spectral density are：
Wherein, the Rn' (τ) be the noise light power spectral density normalized autocorrelation functions, the n is described makes an uproar
Sound, the Pn(fn) be the noise optical power spectrum density, the fnFor the frequency of the noise, the τ is delay variable,
The j is imaginary unit, describedFor the power of the noise,The e is nature pair
Number, it is describedFor a function about τ.
Preferably, the auto-correlation function formula of the no noise cancellation signal optical power spectrum density is：
Wherein, the Rs(τ) is the auto-correlation function of the no noise cancellation signal optical power spectrum density, and the s is that the nothing is made an uproar
Signal, the Ps(fs) be the no noise cancellation signal optical power spectrum density, the fsFor the frequency of the no noise cancellation signal, the τ is
Delay variable, the j are imaginary unit, and the e is natural logrithm, describedFor a function about τ；
The normalized autocorrelation functions of the no noise cancellation signal optical power spectrum density are：
Wherein, the Rs' (τ) be the no noise cancellation signal optical power spectrum density normalized autocorrelation functions, the s is institute
State no noise cancellation signal, the Ps(fs) be the no noise cancellation signal optical power spectrum density, the fs be the no noise cancellation signal frequency,
The τ is delay variable, and the j is imaginary unit, describedFor the power of the no noise cancellation signal,For
The e is natural logrithm, describedFor a function about τ.
Preferably, first preset formula is：
Wherein, the Rsn' (τ) be the normalized autocorrelation functions with din-light signal light power spectrum density, the Rs'
(τ) is the normalized autocorrelation functions of the no noise cancellation signal optical power spectrum density, the Rn' (τ) be the noise light power spectrum
The normalized autocorrelation functions of density, it is describedIt is described for the power of the no noise cancellation signalFor the power of the noise.
Preferably, second preset formula is：
Wherein, the OSNR is the optical signal to noise ratio with din-light signal, power and institute of the α for the no noise cancellation signal
The ratio of the power of noise is stated, the NEB is the equivalent bandwidth of the noise, and the nm is unit nanometer.
In order to achieve the above objectives, the invention also discloses a kind of devices of optical signal-to-noise ratio monitoring, including：
Parameter acquisition module, for obtaining the optical power spectrum density of the optical power spectrum density with din-light signal, noise, nothing is made an uproar
The optical power spectrum density of signal, wherein the band din-light signal carries the noise and the no noise cancellation signal；
Fourier inverse transform module, for described in inverse Fourier transform with din-light signal optical power spectrum density, described make an uproar
It is close to respectively obtain the band din-light signal light power spectrum for the optical power spectrum density of the optical power spectrum density of sound and the no noise cancellation signal
The auto-correlation function of degree, the auto-correlation function of the noise light power spectral density and the no noise cancellation signal optical power spectrum density
Auto-correlation function；
Normalized function module, for normalizing the auto-correlation function with din-light signal light power spectrum density, described
The auto-correlation function of the auto-correlation function of noise light power spectral density and the no noise cancellation signal optical power spectrum density, respectively obtains
Normalized autocorrelation functions with din-light signal light power spectrum density, noise light power spectral density normalized autocorrelation functions,
Normalized autocorrelation functions without noise cancellation signal optical power spectrum density；
The power ratio module of power and noise without noise cancellation signal, for according to the band din-light signal light power spectrum density
Normalized autocorrelation functions, the normalized autocorrelation functions of the noise light power spectral density, the no noise cancellation signal optical power
The normalized autocorrelation functions of spectrum density determine the power and the noise of the no noise cancellation signal by the first preset formula
The ratio of power；
Optical signal-to-noise ratio monitoring module, for monitoring the band din-light signal by the second preset formula according to the ratio
Optical signal to noise ratio.
Preferably, the parameter acquisition module includes：
Band din-light signal acquisition submodule for obtaining there is default band din-light of the fixed optical power spectrum without noise cancellation signal to believe
Number；
Noise and signal acquisition submodule, for being determined in the band din-light signal respectively according to the band din-light signal
Noise and it is described in din-light signal without noise cancellation signal；
Density parameter acquisition submodule, for according to the band din-light signal, the noise and the no noise cancellation signal, difference
Obtain the corresponding optical power spectrum density with din-light signal, the optical power spectrum density of the noise, the no noise cancellation signal
Optical power spectrum density.
The present invention provides a kind of methods of optical signal-to-noise ratio monitoring, inverse by carrying out Fourier to the band din-light signal of acquisition
Transformation and normalization obtain about the normalized autocorrelation functions with din-light signal light power spectrum density, obtained nothing is made an uproar
The normalized autocorrelation functions of signal light power spectrum density and the normalization of noise light power spectral density are used as normal from phase function
Number expression formula, according to the normalized autocorrelation functions with din-light signal light power spectrum density, without noise cancellation signal optical power spectrum density
The normalization of normalized autocorrelation functions and noise light power spectral density is from the mathematical relationship of phase function and the calculating of OSNR
Formula obtains the value of OSNR.The method is easy to operate, and calculating magnitude is small, and monitoring result is accurate, monitoring range is big and efficient.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical 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
It obtains other drawings based on these drawings.
Fig. 1 is the method flow diagram of the optical signal-to-noise ratio monitoring of the embodiment of the present invention；
Fig. 2 is the device figure of the optical signal-to-noise ratio monitoring of the embodiment of the present invention；
Fig. 3 is the optical channel Transmission system figure of the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Below by way of specific embodiment, the present invention is described in detail.
The embodiment of the invention discloses a kind of methods of optical signal-to-noise ratio monitoring, and as shown in FIG. 1, FIG. 1 is the embodiment of the present invention
Optical signal-to-noise ratio monitoring method flow diagram, including：
S101：Obtain the optical power spectrum density with din-light signal, the optical power spectrum density of noise, without the optical power of noise cancellation signal
Spectrum density, wherein band din-light signal carries noise and without noise cancellation signal.
S102：Optical power spectrum density of the inverse Fourier transform with din-light signal, the optical power spectrum density of noise and without making an uproar letter
Number optical power spectrum density, respectively obtain the auto-correlation function with din-light signal light power spectrum density, noise light power spectral density
Auto-correlation function and auto-correlation function without noise cancellation signal optical power spectrum density.
In embodiments of the present invention, the auto-correlation with din-light signal light power spectrum density can be obtained by inverse Fourier transform
Function, the auto-correlation function of noise light power spectral density and the auto-correlation function without noise cancellation signal optical power spectrum density, as returning
One changes the middle transition function for finally obtaining corresponding normalized autocorrelation functions, and when to band din-light signal light power spectrum density
Auto-correlation function, noise light power spectral density auto-correlation function and auto-correlation function without noise cancellation signal optical power spectrum density
Delay variable τ obtains power accordingly with din-light signal, the power of noise and the power without noise cancellation signal when taking 0 value.
S103：Normalize the auto-correlation function with din-light signal light power spectrum density, noise light power spectral density from phase
Function and the auto-correlation function without noise cancellation signal optical power spectrum density are closed, returning with din-light signal light power spectrum density is respectively obtained
One changes auto-correlation function, the normalized autocorrelation functions of noise light power spectral density, the normalizing without noise cancellation signal optical power spectrum density
Change auto-correlation function.
In embodiments of the present invention, to the auto-correlation function with din-light signal light power spectrum density, noise light power spectrum
The auto-correlation function of degree and auto-correlation function without noise cancellation signal optical power spectrum density are normalized, easy to operate, to subsequent
It is simple and convenient with the ratio calculation without noise cancellation signal and noise in din-light signal.
S104：According to the normalized autocorrelation functions with din-light signal light power spectrum density, noise light power spectral density
Normalized autocorrelation functions, the normalized autocorrelation functions without noise cancellation signal optical power spectrum density are determined by the first preset formula
The ratio of the power of power and noise without noise cancellation signal.
S105：The optical signal to noise ratio with din-light signal is monitored by the second preset formula according to ratio.
In the specific implementation process of the embodiment of the present invention, when no noise cancellation signal optical power spectrum, optical filter bandwidth and
When shape invariance, the normalized autocorrelation functions R of no noise cancellation signal optical power spectrum densitys' (τ) and noise light power spectral density return
One changes auto-correlation function Rn' (τ) be fixed value, most starting to determine Rs' (τ) and Rn' after (τ), in the calculating for carrying out OSNR
Cheng Zhongke is by Rs' (τ) and Rn' (τ) be used as constant expression, OSNR monitoring when need measure with din-light signal optical power spectrum
Density Psn(fsn), it then carries out inverse Fourier transform and obtains the auto-correlation function with din-light signal light power spectrum density, then carry out
Normalization obtains the normalized autocorrelation functions R with din-light signal light power spectrum densitysn' (τ), it can easily obtain OSNR's
Value.
As it can be seen that a kind of method of optical signal-to-noise ratio monitoring of the embodiment of the present invention is easy to operate, calculation amount is small, is a kind of simple
The method of feasible optical signal-to-noise ratio monitoring.
Specifically, obtaining the optical power spectrum density with din-light signal, the optical power spectrum density of noise, the light function without noise cancellation signal
Rate spectrum density, including：
The first step, obtaining has default band din-light signal of the fixed optical power spectrum without noise cancellation signal.
Above-mentioned default fixed optical power spectrum is set according to user demand and industrial requirement.
Second step is determined respectively with the noise in din-light signal and is made an uproar with the nothing in din-light signal according to band din-light signal
Signal.
Third step obtains the corresponding optical power with din-light signal according to band din-light signal, noise and without noise cancellation signal respectively
Spectrum density, the optical power spectrum density of noise, the optical power spectrum density without noise cancellation signal.
In embodiments of the present invention, when closing noise, in system only without noise cancellation signal when, spectroanalysis instrument is got without making an uproar
The optical power spectrum density of signal.
When closing without noise cancellation signal, in system only noise when, spectroanalysis instrument gets the optical power spectrum density of noise.
When no noise cancellation signal and noise, which enter in coupler, forms band din-light signal, spectroanalysis instrument gets band din-light
The optical power spectrum density of signal.
Specifically, the optical power spectrum density with din-light signal is obtained, including：
The first step, the band din-light signal after repeatedly noise of the adjustment with din-light signal, after being adjusted.
In embodiments of the present invention, erbium-doped fiber amplifier generation is controlled by the attenuator in noise generating device to make an uproar
The noisiness of sound realizes that noisiness couples to form different OSNR values from no noise cancellation signal in coupler.
It is close repeatedly to obtain the optical power spectrum adjusted with din-light signal according to band din-light signal adjusted for second step
Degree.
In embodiments of the present invention, by adjusting band din-light signal, the light function adjusted with din-light signal is repeatedly obtained
Rate spectrum density realizes the monitoring of OSNR different value, embodies the practicability and robustness of the method for the present invention.
Specifically, the auto-correlation function with din-light signal light power spectrum density is：
Wherein, Rsn(τ) is the auto-correlation function with din-light signal light power spectrum density, and sn is band din-light signal, Psn(fsn)
For the optical power spectrum density with din-light signal, fsnFor the frequency with din-light signal, τ is delay variable, and j is imaginary unit, and e is certainly
Right logarithm,For a function about τ.
Normalized autocorrelation functions with din-light signal light power spectrum density are：
Wherein, Rsn' (τ) be the normalized autocorrelation functions with din-light signal light power spectrum density, sn be band din-light signal,
Psn(fsn) it is the optical power spectrum density with din-light signal, fsnFor the frequency with din-light signal, τ is delay variable, and j is imaginary number list
Position, e is natural logrithm,For the power with din-light signal,For
For a function about τ.
Specifically, the auto-correlation function of noise light power spectral density is：
Wherein, Rn(τ) is the auto-correlation function of noise light power spectral density, and n is noise, Pn(fn) be noise optical power
Spectrum density, fnFor the frequency of noise, τ is delay variable, and j is imaginary unit, and e is natural logrithm,For one about τ
Function.
The normalized autocorrelation functions of noise light power spectral density are：
Wherein, Rn' (τ) be noise light power spectral density normalized autocorrelation functions, n is noise, Pn(fn) it is noise
Optical power spectrum density, fnFor the frequency of noise, τ is delay variable, and j is imaginary unit,For the power of noise,ForE is natural logrithm,For a function about τ.
Specifically, the auto-correlation function formula without noise cancellation signal optical power spectrum density is：
Wherein, Rs(τ) is the auto-correlation function of no noise cancellation signal optical power spectrum density, and s is no noise cancellation signal, Ps(fs) it is that nothing is made an uproar
The optical power spectrum density of signal, fsFor the frequency of no noise cancellation signal, τ is delay variable, and j is imaginary unit, and e is natural logrithm,For a function about τ.
Normalized autocorrelation functions without noise cancellation signal optical power spectrum density：
Wherein, Rs' (τ) be the normalized autocorrelation functions of no noise cancellation signal optical power spectrum density, s is no noise cancellation signal, Ps(fs)
For the optical power spectrum density of no noise cancellation signal, fsFor the frequency of no noise cancellation signal, τ is delay variable, and j is imaginary unit,It makes an uproar for nothing
The power of signal,ForE is natural logrithm,For a function about τ.
In embodiments of the present invention, the light function of the optical power spectrum density adjusted with din-light signal, noise is repeatedly obtained
Rate density and the optical power spectrum density without noise cancellation signal and the power with din-light signal, the power of noise and the power without noise cancellation signal
With following relationship：
Psn(fsn)=Ps(fs)+Pn(fn)
Wherein, Psn(fsn) it is the optical power spectrum density with din-light signal, Pn(fn) be noise optical power spectrum density signal,
Ps(fs) it is the optical power spectrum density without noise cancellation signal,For the power with din-light signal,For the power of noise,For nothing
The power of noise cancellation signal.
According to above-mentioned formula and the normalized autocorrelation functions without noise cancellation signal optical power spectrum density, noise light power spectrum
The relationship of the normalized autocorrelation functions of degree and the normalized autocorrelation functions with din-light signal light power spectrum density can obtain
First preset formula.
Specifically, the first preset formula is：
Wherein, Rsn' (τ) be the normalized autocorrelation functions with din-light signal light power spectrum density, Rs' (τ) be without making an uproar letter
The normalized autocorrelation functions of number optical power spectrum density, Rn' (τ) be noise light power spectral density normalized autocorrelation functions,For the power of no noise cancellation signal,For the power of noise.
In embodiments of the present invention, it calculates the power without noise cancellation signal with din-light signal by the first preset formula and makes an uproar
The ratio of the power of sound calculates the value of optical signal to noise ratio OSNR by ratio and the second preset formula.
Specifically, the second preset formula is：
Wherein, OSNR is the optical signal to noise ratio with din-light signal, and α is the ratio of the power of power and noise without noise cancellation signal,
NEB is the equivalent bandwidth of noise, and nm is unit nanometer.
As it can be seen that the calculation method of the embodiment of the present invention is simple, calculating magnitude is small, quasi- for the monitoring result of optical signal to noise ratio
Really.
As shown in Fig. 2, Fig. 2 is the device figure of the optical signal-to-noise ratio monitoring of the embodiment of the present invention, including：
Parameter acquisition module 201, for obtain the optical power spectrum density with din-light signal, noise optical power spectrum density,
Optical power spectrum density without noise cancellation signal, wherein band din-light signal carries noise and without noise cancellation signal.
Fourier inverse transform module 202, the light of optical power spectrum density, noise for inverse Fourier transform with din-light signal
Power spectral density and optical power spectrum density without noise cancellation signal, respectively obtain the auto-correlation letter with din-light signal light power spectrum density
Number, the auto-correlation function of noise light power spectral density and the auto-correlation function without noise cancellation signal optical power spectrum density.
Normalized function module 203, for normalizing the auto-correlation function with din-light signal light power spectrum density, noise light
The auto-correlation function of power spectral density and auto-correlation function without noise cancellation signal optical power spectrum density respectively obtain band din-light signal
The normalized autocorrelation functions of optical power spectrum density, the normalized autocorrelation functions of noise light power spectral density, without noise cancellation signal light
The normalized autocorrelation functions of power spectral density.
The power ratio module 204 of power and noise without noise cancellation signal, for according to band din-light signal light power spectrum density
Normalized autocorrelation functions, noise light power spectral density normalized autocorrelation functions, without noise cancellation signal optical power spectrum density
Normalized autocorrelation functions determine the ratio of the power of power and noise without noise cancellation signal by the first preset formula.
Optical signal-to-noise ratio monitoring module 205, for monitoring the light with din-light signal by the second preset formula according to ratio
Signal-to-noise ratio.
The embodiment of the present invention utilizes fourier function and normalization transformation by inventing the device of optical signal-to-noise ratio monitoring a kind of
Method realizes the monitoring of OSNR value, is a kind of simple possible, the device for calculating magnitude small optical signal-to-noise ratio monitoring.
It should be noted that the device of the embodiment of the present invention is using the device of the method for above-mentioned optical signal-to-noise ratio monitoring, then
All embodiments of the method for above-mentioned optical signal-to-noise ratio monitoring are suitable for the device, and can reach the same or similar beneficial to effect
Fruit.
In the device of the optical signal-to-noise ratio monitoring of the embodiment of the present invention, parameter acquisition module 201 includes：
Band din-light signal acquisition submodule for obtaining there is default band din-light of the fixed optical power spectrum without noise cancellation signal to believe
Number.
Noise and signal acquisition submodule, for according to band din-light signal, respectively determine in din-light signal noise and
With in din-light signal without noise cancellation signal.
Density parameter acquisition submodule, for obtaining corresponding band respectively according to band din-light signal, noise and without noise cancellation signal
Optical power spectrum density, the optical power spectrum density of noise, the optical power spectrum density without noise cancellation signal of din-light signal.
In the device of the optical signal-to-noise ratio monitoring of further embodiment of this invention, parameter acquisition module 201 includes：
Adjusting submodule, for the band din-light signal after repeatedly noise of the adjustment with din-light signal, after being adjusted.
Acquisition submodule, for repeatedly obtaining the light adjusted with din-light signal according to band din-light signal adjusted
Power spectral density.
Band din-light in the device of the optical signal-to-noise ratio monitoring of further embodiment of this invention, in Fourier inverse transform module 202
The auto-correlation function of signal light power spectrum density is：
Wherein, Rsn(τ) is the auto-correlation function with din-light signal light power spectrum density, and sn is band din-light signal, Psn(fsn)
For the optical power spectrum density with din-light signal, fsnFor the frequency with din-light signal, τ is delay variable, and j is imaginary unit, and e is certainly
Right logarithm,For a function about τ.
Normalized function module 203, for normalizing the auto-correlation function with din-light signal light power spectrum density, band din-light
The normalized autocorrelation functions of signal light power spectrum density are：
Wherein, Rsn' (τ) be the normalized autocorrelation functions with din-light signal light power spectrum density, sn be band din-light signal,
Psn(fsn) it is the optical power spectrum density with din-light signal, fsnFor the frequency with din-light signal, τ is delay variable, and j is imaginary number list
Position, e is natural logrithm,For the power with din-light signal,For
For a function about τ.
Noise light in the device of the optical signal-to-noise ratio monitoring of further embodiment of this invention, in Fourier inverse transform module 202
The auto-correlation function of power spectral density is：
Wherein, Rn(τ) is the auto-correlation function of noise light power spectral density, and n is noise, Pn(fn) be noise optical power
Spectrum density, fnFor the frequency of noise, τ is delay variable, and j is imaginary unit, and e is natural logrithm,For one about
The function of τ.
The normalized autocorrelation functions of noise light power spectral density in normalized function module 203 are：
Wherein, Rn' (τ) be noise light power spectral density normalized autocorrelation functions, n is noise, Pn(fn) it is noise
Optical power spectrum density, fnFor the frequency of noise, τ is delay variable, and j is imaginary unit,For the power of noise,ForE is natural logrithm,For a function about τ.
In the device of the optical signal-to-noise ratio monitoring of further embodiment of this invention, the nothing in Fourier inverse transform module 202 is made an uproar letter
The auto-correlation function of number optical power spectrum density is：
Wherein, Rs(τ) is the auto-correlation function of no noise cancellation signal optical power spectrum density, and s is no noise cancellation signal, Ps(fs) it is that nothing is made an uproar
The optical power spectrum density of signal, fs are the frequency without noise cancellation signal, and τ is delay variable, and j is imaginary unit, and e is natural logrithm,For a function about τ.
The normalized autocorrelation functions without noise cancellation signal optical power spectrum density in normalized function module 203 are：
Wherein, Rs' (τ) be the normalized autocorrelation functions of no noise cancellation signal optical power spectrum density, s is no noise cancellation signal, Ps(fs)
For the optical power spectrum density of no noise cancellation signal, fs is the frequency without noise cancellation signal, and τ is delay variable, and j is imaginary unit,It makes an uproar for nothing
The power of signal,ForE is natural logrithm,For a function about τ.
In the device of the optical signal-to-noise ratio monitoring of further embodiment of this invention, no noise cancellation signal power and noise power ratio module
The first preset formula in 204 is：
Wherein, Rsn' (τ) be the normalized autocorrelation functions with din-light signal light power spectrum density, Rs' (τ) be without making an uproar letter
The normalized autocorrelation functions of number optical power spectrum density, Rn' (τ) be noise light power spectral density normalized autocorrelation functions,For the power of no noise cancellation signal,For the power of noise.
The second default public affairs in the device of the optical signal-to-noise ratio monitoring of further embodiment of this invention, in optical signal to noise ratio module 205
Formula is：
Wherein, OSNR is the optical signal to noise ratio with din-light signal, and α is the ratio of the power of power and noise without noise cancellation signal,
NEB is the equivalent bandwidth of noise, and nm is unit nanometer.
In embodiments of the present invention, by the device that invention light noise monitors obtain without noise cancellation signal optical power spectrum density
Normalized autocorrelation functions, the normalized autocorrelation functions of obtained noise light power spectral density, and obtain without noise cancellation signal
The normalized autocorrelation functions of optical power spectrum density are obtained according to the calculation formula of functional relation between them and OSNR
The value of OSNR, light noise monitoring device is simple, convenient, and the result of monitoring is accurate, efficient.
A kind of method and apparatus for being designed to provide optical signal-to-noise ratio monitoring of the embodiment of the present invention generate band din-light and believe
Number optical power spectrum density, the optical power spectrum density of noise, the optical channel Transmission system of optical power spectrum density without noise cancellation signal such as
Shown in Fig. 3, Fig. 3 is the optical channel Transmission system figure of the embodiment of the present invention.Include in Fig. 3：25G baud PDM-NRZ-QPSK
(25G baud Polarization Division Multiplexing-Non-Return to Zero-Quadrature
The strong control of Phase Shift Keyin, 25G baud-palarization multiplexing-non-return-to-zero-quadrature phase) signal transmitter 310.Wherein, IQ
Mod (in-phase quadrature modulator, quadrature quadrature modulator) 311 generates NRZ-QPSK (Non-Return
To Zero-Quadrature Phase Shift Keyin, the strong control of non-return-to-zero-quadrature phase) signal；What IQ mod311 was generated
NRZ-QPSK signal passes through PBS by PC (Polarization Combiner, Polarization Controller) 312, PC312 control
The power of two-way NRZ-QPSK signal after (Polarization Beam Splitter, polarization beam apparatus) 313 is impartial；Through
The NRZ-QPSK signal of generation is divided into two beams using PBS313, PBS313 by the NRZ-QPSK signal for crossing PC312；PBS313 will
NRZ-QPSK signal is divided into the wherein a branch of of two beams and passes through PMF (Polarization Maintenance Fibers, polarization-maintaining light
It is fine) correlation of 314, PMF314 removal two-way NRZ-QPSK signal after PBS313；By the two of PMF314 removal correlation
Road NRZ-QPSK signal is finally produced by PBC (Polarization Beam Combiner, polarization beam combiner) 315, PBC315
Raw 25G baud PDM-NRZ-QPSK is without noise cancellation signal.It further include noise generating device 320 in Fig. 3, wherein EDFA (Erbium-
Doped Optical Fiber Amplifier, erbium-doped fiber amplifier) 321 it is used to generate noise, simulation is practical without noise cancellation signal
Noise is introduced because being amplified without noise cancellation signal in transmission process, the noise that EDFA321 is generated passes through attenuator 322, attenuator 322
For controlling generation noisiness.The 25G baud PDM-NRZ- that 25G baud PDM-NRZ-QPSK signal transmitter 310 generates
QPSK generates band din-light signal, band din-light by the coupling of coupler 330 without the noise that noise cancellation signal and noise generating device 320 generate
Signal filters out the excess bandwidth in noise by OBPF (Optical Band Pass Filter, optical band pass filter) 340, will
It is controlled in the bandwidth of OBPF340 with the noise bandwidth in din-light signal, passes through OSA by the band din-light signal of OBPF340
(Optical Spectroscopy Analyzer, spectroanalysis instrument) 350, OSA350 is used to obtain the optical power of no noise cancellation signal
Spectrum density, the optical power spectrum density of noise and the optical power spectrum density with din-light signal.
It should be noted that, in this document, 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 actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for 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
There is also other identical elements in process, method, article or equipment including element.
Each embodiment in this specification is all made of relevant mode and describes, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system reality
For applying example, since it is substantially similar to the method embodiment, so being described relatively simple, related place is referring to embodiment of the method
Part explanation.
The above is merely preferred embodiments of the present invention, it is not intended to limit the scope of the present invention.It is all in this hair
Any modification, equivalent replacement, improvement and so within bright spirit and principle, are included within the scope of protection of the present invention.
Claims (8)
1. a kind of method of optical signal-to-noise ratio monitoring, which is characterized in that including：
The optical power spectrum density with din-light signal, the optical power spectrum density of noise, the optical power spectrum density without noise cancellation signal are obtained,
In, the band din-light signal carries the noise and the no noise cancellation signal；
The optical power spectrum density and the nothing of optical power spectrum density, the noise described in inverse Fourier transform with din-light signal are made an uproar
The optical power spectrum density of signal respectively obtains the auto-correlation function with din-light signal light power spectrum density, the noise light
The auto-correlation function of the auto-correlation function of power spectral density and the no noise cancellation signal optical power spectrum density；
Normalize the auto-correlation of the auto-correlation function with din-light signal light power spectrum density, the noise light power spectral density
The auto-correlation function of function and the no noise cancellation signal optical power spectrum density, respectively obtains with din-light signal light power spectrum density
Normalized autocorrelation functions, the normalized autocorrelation functions of noise light power spectral density, returning without noise cancellation signal optical power spectrum density
One changes auto-correlation function；
Returned according to the normalized autocorrelation functions with din-light signal light power spectrum density, the noise light power spectral density
One changes the normalized autocorrelation functions of auto-correlation function, the no noise cancellation signal optical power spectrum density, passes through the first preset formulaDetermine the power of the no noise cancellation signal and the power of the noise
Ratio, wherein the Rsn' (τ) be the normalized autocorrelation functions with din-light signal light power spectrum density, the Rs'
(τ) is the normalized autocorrelation functions of the no noise cancellation signal optical power spectrum density, the Rn' (τ) be the noise light power spectrum
The normalized autocorrelation functions of density, it is describedIt is described for the power of the no noise cancellation signalFor the power of the noise；
According to the ratio, pass through the second preset formulaMonitoring institute
State the optical signal to noise ratio with din-light signal, wherein the OSNR is the optical signal to noise ratio with din-light signal, and the α is the nothing
The ratio of the power of the power of noise cancellation signal and the noise, the NEB are the equivalent bandwidth of the noise, and the nm receives for unit
Rice.
2. the method for optical signal-to-noise ratio monitoring according to claim 1, which is characterized in that the light of the acquisition with din-light signal
Power spectral density, the optical power spectrum density of noise, the optical power spectrum density without noise cancellation signal, including：
Obtaining has default band din-light signal of the fixed optical power spectrum without noise cancellation signal；
According to the band din-light signal, determine that the noise in din-light signal and the nothing in din-light signal are made an uproar respectively
Signal；
According to the band din-light signal, the noise and the no noise cancellation signal, obtain respectively corresponding described with din-light signal
Optical power spectrum density, the optical power spectrum density of the noise, the optical power spectrum density of the no noise cancellation signal.
3. the method for optical signal-to-noise ratio monitoring according to claim 1, which is characterized in that the light of the acquisition with din-light signal
Power spectral density, including：
Band din-light signal after repeatedly adjusting the noise with din-light signal, after being adjusted；
According to the band din-light signal adjusted, the optical power spectrum density adjusted with din-light signal is repeatedly obtained.
4. the method for optical signal-to-noise ratio monitoring according to claim 1, which is characterized in that the band din-light signal light power spectrum
The auto-correlation function of density is：
Wherein, the Rsn(τ) is the auto-correlation function with din-light signal light power spectrum density, and the sn is the band din-light
Signal, the Psn(fsn) it is the optical power spectrum density with din-light signal, the fsnFor the frequency with din-light signal,
The τ is delay variable, and the j is imaginary unit, and the e is natural logrithm, describedFor a letter about τ
Number；
The normalized autocorrelation functions with din-light signal light power spectrum density are：
Wherein, the Rsn' (τ) be the normalized autocorrelation functions with din-light signal light power spectrum density, the sn is institute
State band din-light signal, the Psn(fsn) it is the optical power spectrum density with din-light signal, the fsnFor the band din-light signal
Frequency, the τ be delay variable, the j be imaginary unit, the e be natural logrithm, it is describedFor band din-light letter
Number power,ForIt is describedFor a function about τ.
5. the method for optical signal-to-noise ratio monitoring according to claim 1, which is characterized in that the noise light power spectral density
Auto-correlation function is：
Wherein, the Rn(τ) is the auto-correlation function of the noise light power spectral density, and the n is the noise, the Pn
(fn) be the noise optical power spectrum density, the fnFor the frequency of the noise, the τ is delay variable, and the j is void
Number unit, the e is natural logrithm, describedFor a function about τ；
The normalized autocorrelation functions of the noise light power spectral density are：
Wherein, the Rn' (τ) be the noise light power spectral density normalized autocorrelation functions, the n be the noise, institute
State Pn(fn) be the noise optical power spectrum density, the fnFor the frequency of the noise, the τ is delay variable, the j
It is described for imaginary unitFor the power of the noise,The e is natural logrithm, institute
It statesFor a function about τ.
6. the method for optical signal-to-noise ratio monitoring according to claim 1, which is characterized in that the no noise cancellation signal optical power spectrum is close
The auto-correlation function of degree is：
Wherein, the Rs(τ) is the auto-correlation function of the no noise cancellation signal optical power spectrum density, and the s is the no noise cancellation signal,
The Ps(fs) be the no noise cancellation signal optical power spectrum density, the fsFor the frequency of the no noise cancellation signal, the τ is delay
Variable, the j are imaginary unit, and the e is natural logrithm, describedFor a function about τ；
The normalized autocorrelation functions of the no noise cancellation signal optical power spectrum density are：
Wherein, the Rs' (τ) be the no noise cancellation signal optical power spectrum density normalized autocorrelation functions, the s be the nothing
Noise cancellation signal, the Ps(fs) be the no noise cancellation signal optical power spectrum density, the fsFor the frequency of the no noise cancellation signal, the τ
For delay variable, the j is imaginary unit, describedFor the power of the no noise cancellation signal,For
The e is natural logrithm, describedFor a function about τ.
7. a kind of device of optical signal-to-noise ratio monitoring, which is characterized in that including：
Parameter acquisition module, for obtaining the optical power spectrum density of the optical power spectrum density with din-light signal, noise, without noise cancellation signal
Optical power spectrum density, wherein the band din-light signal carries the noise and the no noise cancellation signal；
Fourier inverse transform module, for the optical power spectrum density described in inverse Fourier transform with din-light signal, the noise
The optical power spectrum density of optical power spectrum density and the no noise cancellation signal respectively obtains described with din-light signal light power spectrum density
Auto-correlation function, the auto-correlation function of the noise light power spectral density and the no noise cancellation signal optical power spectrum density from phase
Close function；
Normalized function module, for normalizing the auto-correlation function with din-light signal light power spectrum density, the noise
The auto-correlation function of the auto-correlation function of optical power spectrum density and the no noise cancellation signal optical power spectrum density, respectively obtains band and makes an uproar
The normalized autocorrelation functions of optical signal optical power spectrum density, the normalized autocorrelation functions of noise light power spectral density, nothing are made an uproar
The normalized autocorrelation functions of signal light power spectrum density；
The power ratio module of power and noise without noise cancellation signal, for according to the returning with din-light signal light power spectrum density
One change auto-correlation function, the normalized autocorrelation functions of the noise light power spectral density, the no noise cancellation signal optical power spectrum are close
The normalized autocorrelation functions of degree pass through the first preset formulaReally
The ratio of the power of the power and noise of the fixed no noise cancellation signal, wherein the Rsn' (τ) be the band din-light signal light
The normalized autocorrelation functions of power spectral density, the Rs' (τ) be the normalization of the no noise cancellation signal optical power spectrum density from phase
Close function, the Rn' (τ) be the noise light power spectral density normalized autocorrelation functions, it is describedIt makes an uproar letter for the nothing
Number power, it is describedFor the power of the noise；
Optical signal-to-noise ratio monitoring module, for passing through the second preset formula according to the ratio
Monitor the optical signal to noise ratio with din-light signal, wherein the OSNR is the optical signal to noise ratio with din-light signal, and the α is
The ratio of the power of the power and noise of the no noise cancellation signal, the NEB are the equivalent bandwidth of the noise, and the nm is
Unit nanometer.
8. the device of optical signal-to-noise ratio monitoring according to claim 7, which is characterized in that the parameter acquisition module includes：
Band din-light signal acquisition submodule has default band din-light signal of the fixed optical power spectrum without noise cancellation signal for obtaining；
Noise and signal acquisition submodule, for determining respectively described with making an uproar in din-light signal according to the band din-light signal
Sound and it is described in din-light signal without noise cancellation signal；
Density parameter acquisition submodule, for being obtained respectively according to the band din-light signal, the noise and the no noise cancellation signal
The corresponding optical power spectrum density with din-light signal, the optical power spectrum density of the noise, the no noise cancellation signal light function
Rate spectrum density.
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