CN104052544B - Monitoring method and device for optical signal to noise ratio - Google Patents
Monitoring method and device for optical signal to noise ratio Download PDFInfo
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- CN104052544B CN104052544B CN201410319948.3A CN201410319948A CN104052544B CN 104052544 B CN104052544 B CN 104052544B CN 201410319948 A CN201410319948 A CN 201410319948A CN 104052544 B CN104052544 B CN 104052544B
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Abstract
The invention discloses a monitoring method for the optical signal to noise ratio. Two kinds of filtering information are adopted for carrying out filtering and interferometry on optical signals and ASE noise of a transmitting terminal to obtain correction values and adopted for carrying out filtering and delayed interferometry on monitored channels on optical channel monitoring points to obtain corresponding correction values in a combined mode, then the absolute power value of the optical signals and the absolute power value of the ASE noise are obtained, and therefore the optical signal to noise ratio is monitored. Based on the same inventive concept, the invention further provides a monitoring device for the optical signal to noise ratio. The monitoring device is good in resistance to spectrum distortion damage of monitored signals, and can monitor the optical signal to noise ratio of the monitored signals accurately on line.
Description
Technical field
The application is related to communication technical field, particularly to a kind of OSNR Monitoring Method and device.
Background technology
OSNR (OSNR) is monitoring and evaluates one of critical performance parameters of optical communication system, fixed in line fault
The aspects such as position, pretection switch alarm, damage perception route and system O＆M optimization have important value.
Raising with optical signal modulation speed and ROADM (ROADM) are in dense wave division multipurpose
(DWDM) application in optical-fiber network, radiates traditional OSNR of (ASE) noise testing and linear interpolation based on the outer spontaneous amplification of band
Monitoring method is no longer applicable.
And there is the polarization subsidiary OSNR monitoring method of different polarization characteristic using optical signal and ASE noise, for example
Polarization return-to-zero method and interference of polarization, for the dual-polarization state multiplexed signals in coherent optical communication system, such as dual-polarization multiplexing
QPSK (DP-QPSK) and dual-polarization are multiplexed 16 symbol quadrature-amplitude modulation (DP-16QAM), are all difficult to be suitable for.
OSNR at this stage tests the general power integral method adopting based on spectrometer measurement channel power and using shutoff
ASE noise power in method measurement band, but the method testing efficiency is low and needs interrupting service signal it is impossible to carry out online reality
When OSNR monitoring.
Content of the invention
In view of this, the application provides a kind of OSNR Monitoring Method and device, can not be supervised online with solving signal to noise ratio
The problem surveyed.
For solving above-mentioned technical problem, the technical scheme of the application is realized in：
A kind of OSNR OSNR monitoring method, methods described includes：
It is coupled out the optical signal that percentage is A from tested optical channel monitoring point；
With the first filtering information, the optical signal being coupled out is filtered obtaining the first filtering signal, then from this first filtering
Being coupled out percentage in signal is B and two parts of beam splitting optical signals of C, carries out postponing to do by the beam splitting optical signal for B to percentage
Relate to and measure acquisition the first luminous power and the second luminous power, measurement percentage is that the beam splitting optical signal of C obtains the 3rd luminous power, and
The first corrected value according to storage and the second corrected value, and the first luminous power, the second luminous power and the 3rd luminous power obtaining
Obtain by the performance number of light signal；
With the second filtering information, the optical signal being coupled out is filtered obtaining the second filtering signal, then from this second filtering
Being coupled out percentage in signal is B and two parts of beam splitting optical signals of C, carries out delayed interference by the beam splitting optical signal for B for the percentage
And measuring acquisition the 4th luminous power and the 5th luminous power, measurement percentage is that the beam splitting optical signal of C obtains the 6th luminous power, and root
According to the 3rd corrected value and the 4th corrected value of storage, and obtain the 4th luminous power, the 5th luminous power and the acquisition of the 6th luminous power
ASE noise power-value；
Wherein, A, B, C are all higher than 0 and are less than 1, C less than B, and C with B's and is 1；First filtering information includes being believed by light-metering
The centre wavelength in road and channel width；Second filtering information includes：The centre wavelength of tested optical channel and OSNR reference bandwith；
Tested letter is obtained according to the performance number by light signal obtaining, ASE noise power-value, and OSNR reference bandwith
The OSNR value in road.
A kind of OSNR OSNR monitoring device, this device includes：Memory cell, the first coupling unit, filter unit,
Two coupling units, delayed interference unit, the first power measurement unit, the second power measurement unit, the 3rd power measurement unit and
Computing unit；
Described memory cell, for storing the first corrected value, the second corrected value, the 3rd corrected value and the 4th corrected value；
Described first coupling unit, for being coupled out, from tested optical channel monitoring point, the optical signal that percentage is A；
Described filter unit, the optical signal for being coupled out to described first coupling unit with the first filtering information is filtered
Ripple obtains the first filtering signal；The optical signal described first coupling unit being coupled out with the second filtering information is filtered obtaining
Second filtering signal；Wherein, the first filtering information includes centre wavelength and the channel width of tested optical channel；Second filtering information
Centre wavelength including tested optical channel and OSNR reference bandwith；
Described second coupling unit, for being coupled out percentage in the first filtering signal of obtaining from described filter unit be
Two parts of beam splitting optical signals of B and C；Being coupled out percentage from the second filtering signal that described filter unit obtains is B and two parts points of C
Bundle optical signal；Wherein, A, B, C are all higher than 0 and are less than 1, C less than B, and C with B's and is 1；
Described delayed interference unit, for the percentage that described second coupling unit is coupled out from the first filtering signal
Beam splitting optical signal for B carries out delayed interference；The percentage that described second coupling unit is coupled out from the second filtering signal
Beam splitting optical signal for B carries out delayed interference；
Described first power measurement unit, is coupled out for being directed in the first filtering signal to described delayed interference unit
Signal after signal transacting carries out power measurement, obtains the first luminous power；Described delayed interference unit is directed to the second filtering letter
Signal after the signal transacting being coupled out in number carries out power measurement, obtains the 4th luminous power；
Described second power measurement unit, for interfering delay cell to be directed in the first filtering signal to be coupled out to described
Information after signal transacting carries out power measurement, obtains the second luminous power；Second filtering letter is directed to described interference delay cell
Information after the signal transacting being coupled out in number carries out power measurement, obtains the 5th luminous power；
Described 3rd luminous power, the percentage for being coupled out for the first filtering signal to described second coupling unit is
The beam splitting optical signal of C carries out power measurement and obtains the 3rd luminous power；Second filtering signal coupling is directed to described second coupling unit
The percentage closing out is that the beam splitting optical signal of C carries out power measurement acquisition the 6th luminous power；
Described computing unit, for the first corrected value of being stored according to described memory cell and the second corrected value, Yi Jisuo
State the first luminous power that the first power measurement unit obtains, the second luminous power and described that described second power measurement unit obtains
The 3rd luminous power that 3rd power measurement unit obtains obtains by the performance number of light signal；According to the storage of described memory cell
First corrected value and the second corrected value, and described first power measurement unit obtain the 4th luminous power, described second power
The 5th luminous power that measuring unit obtains and the 6th luminous power of described 3rd power measurement unit acquisition obtain ASE noise power
Value；Tested channel is obtained according to the performance number by light signal obtaining, ASE noise power-value, and OSNR reference bandwith
OSNR value.
In sum, the application transmitting terminal optical signal and ASE noise are filtered by using two kinds of filtering informations and
Interferometry obtains corrected value, in optical channel monitoring point, monitored channel is filtered and delayed interference with two kinds of filtering informations
Measurement, in conjunction with the corresponding corrected value obtaining, obtains the power absolute value of optical signal and ASE noise, and then monitors OSNR, to quilt
The spectrum distortion surveying signal damages the OSNR having good resistance such that it is able to online accurate measurements go out measured signal.
Brief description
Fig. 1 is OSNR monitoring method schematic flow sheet in the embodiment of the present application；
Fig. 2 is OSNR monitoring result analogous diagram；
Fig. 3 is the apparatus structure schematic diagram being applied to above-mentioned technology in the application specific embodiment.
Specific embodiment
Purpose, technical scheme and advantage for making the application become more apparent, and develop simultaneously embodiment referring to the drawings, right
Herein described scheme is described in further detail.
A kind of OSNR Monitoring Method is proposed, using two kinds of filtering informations to transmitting terminal optical signal in the embodiment of the present application
It is filtered obtaining corrected value with interferometry with ASE noise, in optical channel monitoring point to monitored channel with two kinds of filtering letters
Breath is filtered measuring with delayed interference, in conjunction with the corresponding corrected value obtaining, obtains optical signal and the power of ASE noise is absolute
Value, and then monitor OSNR, the spectrum distortion damage to measured signal has good resistance such that it is able to accurately supervise online
Measure the OSNR of measured signal.
When the application implements, the equipment realizing the application OSNR monitoring is referred to as monitoring device.
Before carrying out online OSNR monitoring, monitoring device needs to first pass through the first filtering information, the second filtering the application
The ASE noise that information produces to transmitter terminal optical signal and erbium-doped fiber amplifier (EDFA) respectively carries out process and is obtained ahead of time
One corrected value, the second corrected value, the 3rd corrected value and the 4th corrected value simultaneously store, and when being used for carrying out online OSNR monitoring, use
These corrected values correct to monitor value, to obtain the accurate OSNR value of tested channel.
Completed before carrying out on-line monitoring because this part is processed, and only obtain once preservation and use,
Resource during on-line monitoring will not be taken, it is thus possible to improve monitoring efficiency.
Wherein, the first filtering information includes：The centre wavelength of tested optical channel and channel width, the typical case of channel width joins
It is set to 50GHz it is also possible to according to practical application concrete configuration.
Second filtering information includes：The centre wavelength of tested optical channel and OSNR reference bandwith, OSNR reference bandwith typical case
For 12.5GHz it is also possible to concrete configuration is applied according to adaptation.
The following detailed description of obtain in the embodiment of the present application once the first corrected value, the second corrected value and the 3rd corrected value with
And the 4th corrected value detailed process：
Monitoring device is filtered to transmitter terminal optical signal with the first filtering information, and filtered optical signal is prolonged
Interfere late, and mutually long-armed power and cancellation arm power are obtained to delayed interference outcome measurement, calculate this mutually long-armed power and cancellation
The ratio of arm power as the first corrected value and stores.
Monitoring device is filtered to the ASE noise that EDFA produces with the first filtering information, and filtered noise is carried out
Delayed interference, and mutually long-armed power and cancellation arm power are obtained to delayed interference outcome measurement, calculate this mutually long-armed power and phase
The ratio of arm power of disappearing as the second corrected value and stores.
Monitoring device is filtered to transmitter terminal optical signal with the second filtering information, and filtered optical signal is prolonged
Interfere late, and mutually long-armed power and cancellation arm power are obtained to delayed interference outcome measurement, calculate this mutually long-armed power and cancellation
The ratio of arm power as the 3rd corrected value and stores.
Monitoring device is filtered to the ASE noise that EDFA produces with the second filtering information, and filtered noise is carried out
Delayed interference, and mutually long-armed power and cancellation arm power are obtained to delayed interference outcome measurement, calculate this mutually long-armed power and phase
The ratio of arm power of disappearing as the 4th corrected value and stores.
Respectively the optical signal of non-plus noise is processed in the embodiment of the present application, obtain the first corrected value and the 3rd correction
Value, the ASE noise respectively EDFA being produced is processed, and obtains the second corrected value and the 4th corrected value, using these corrected values
Optical signal in actual optical channel is carried out with the monitoring of OSNR value.
Below in conjunction with the accompanying drawings, describe in detail and in the application specific embodiment, how to realize OSNR monitoring.Referring to Fig. 1, Fig. 1
For OSNR monitoring method schematic flow sheet in the embodiment of the present application.Concretely comprise the following steps：
Step 101, monitoring device is coupled out, from tested optical channel monitoring point, the optical signal that percentage is A.
Monitoring device is coupled out, using photo-coupler, the optical signal that percentage is A from optical channel, is used for carrying out online
OSNR monitors.For the configuration of percentage A, when implementing, can have configuration according to actual, actual logical neither to affect
Letter, also will not make monitor value error too big, lead to monitor inaccurate for principle.It is 10% as A can be configured.
Step 102, this monitoring device is filtered obtaining the first filtering to the optical signal being coupled out with the first filtering information
Signal, then it is coupled out percentage from this first filtering signal for B and two parts of beam splitting optical signals of C, by dividing for B to percentage
Bundle optical signal carries out delayed interference and measures acquisition the first luminous power and the second luminous power, and measurement percentage is the beam splitting light letter of C
Number obtain the 3rd luminous power, and according to the first corrected value, the second corrected value, the first luminous power, the second luminous power and the 3rd smooth work(
Rate obtains by the performance number of light signal.
In this step, A, B, C are all higher than 0 and are less than 1, C less than B, and C with B's and is 1.For being processed by delayed interference
Afterwards, the percentage carrying out that part of optical signal of power measurement is greater than that part of optical signal directly carrying out power measurement., specifically real
Now, the value of B and C can be configured according to practical application, and such as C is 10%, B is 90%.
Monitoring device is filtered to the optical signal being coupled out by adjustable optical band pass filter using the first filtering information
Ripple, reuses photo-coupler after obtaining the first filtering signal and is coupled out two parts of beam splitting optical signals from the first filtering signal, wherein,
After a optical signal passes through delayed interference, respectively the first luminous power is obtained to mutually long-armed and cancellation arm measure by two power meters
With the second luminous power；Another carries out power measurement by power meter and obtains the 3rd luminous power.
The first luminous power that monitoring device obtains is mutually long-armed power, and acquisition the second luminous power is cancellation arm power.
Monitoring device obtains according to the first corrected value, the second corrected value, the first luminous power, the second luminous power and the 3rd luminous power
Obtain by the performance number of light signal, be implemented as：
Wherein, PSIG_TESTIt is by the performance number of light signal, α is the first corrected value, β is the second corrected value, P1_TESTFor
One luminous power, P2_TESTFor the second luminous power, P3_TESTFor the 3rd luminous power.
Step 103, this monitoring device is filtered obtaining the second filtering to the optical signal being coupled out with the second filtering information
Signal, then it is coupled out percentage from this second filtering signal for B and two parts of beam splitting optical signals of C, by the beam splitting for B for the percentage
Optical signal carries out delayed interference and measures acquisition the 4th luminous power and the 5th luminous power, and measurement percentage is the beam splitting optical signal of C
Obtain the 6th luminous power, and according to the 3rd corrected value, the 4th corrected value, the 4th luminous power, the 5th luminous power and the 6th smooth work(
Rate obtains ASE noise power-value.
In this step, A, B, C are all higher than 0 and are less than 1, C less than B, and C with B's and is 1.For being processed by delayed interference
Afterwards, the percentage carrying out that part of optical signal of power measurement is greater than that part of optical signal directly carrying out power measurement, specifically real
Now, the value of B and C can be configured according to practical application, and such as C is 10%, B is 90%.
Monitoring device is filtered to the optical signal being coupled out by adjustable optical band pass filter using the second filtering information
Ripple, reuses photo-coupler after obtaining the second filtering signal and is coupled out two parts of beam splitting optical signals from the second filtering signal, wherein,
After a optical signal passes through delayed interference, respectively the 4th luminous power is obtained to mutually long-armed and cancellation arm measure by two power meters
With the 5th luminous power；Another carries out power measurement by power meter and obtains the 6th luminous power.
The 4th luminous power that monitoring device obtains is mutually long-armed power, and acquisition the 5th luminous power is cancellation arm power.
Monitoring device obtains according to the 3rd corrected value, the 4th corrected value, the 4th luminous power, the 5th luminous power and the 6th luminous power
Obtain ASE noise power-value, specially：
Wherein, PASE_TESTFor ASE noise power, α ' is the 3rd corrected value, and β ' is the 4th corrected value, P '1_TESTFor the 4th light
Power, P '2_TESTFor the 5th luminous power, P '3_TESTFor the 6th luminous power.
The execution of step 102 and step 103 order in no particular order.
When delayed interference being carried out to optical signal in step 102 and step 103, it is possible to use variable optical delay line adjusts mutually long
Arm and cancellation arm frequency response peak intervals, ensure the letter of the mutually long-armed and cancellation arm output of delayed interference using optical phase device
Number quadrature in phase coupling.
Step 104, this monitoring device according to obtain the performance number by light signal and ASE noise power-value, and
OSNR reference bandwith obtains the OSNR value of tested channel.
In this step, monitoring device obtains the OSNR value of tested channel, specially：
Wherein, OSNR is the OSNR value of tested channel, BASE_TESTFor OSNR reference bandwith, the OSNR using during actual filtering
Bandwidth.
The embodiment of the present application provide OSNR monitoring method for tested optical signal spectrum distort damage have good
Resistance, the especially high-speed optical signal to the multiplexing of dual-polarization state.
Below, the application set instantiation, provides the technical scheme energy using the application in the form of emulating schematic diagram
The effect enough reaching.
Referring to Fig. 2, Fig. 2 is OSNR monitoring result analogous diagram.To 100Gb/s DP-QPSK signal and Shuangzi carrier wave in Fig. 2
Multiplexing 400Gb/s DP-16QAM signal carries out OSNR monitoring.Abscissa is OSNR actual value, and ordinate is monitoring error, Fig. 2
In further comprises the transmitting spectrum of the end signal and constellation of receiving terminal list polarization state, list carrier wave demodulation signal of two kinds of signals
Figure.OSNR monitoring error in the range of 4dB to 32dB is respectively less than 0.5dB, shows that the embodiment of the present application can be to palarization multiplexing
Different rates and the high-speed optical signal of modulation format carry out accurate OSNR monitoring.
Based on same inventive concept, the application also proposes a kind of optical signal-to-noise ratio monitoring device.Referring to Fig. 3, Fig. 3 is this Shen
Please be applied to the apparatus structure schematic diagram of above-mentioned technology in specific embodiment.This device includes：Memory cell 301, first couples
Unit 302, filter unit 303, the second coupling unit 304, delayed interference unit 305, the first power measurement unit 306, second
Power measurement unit 307, the 3rd power measurement unit 308 and computing unit 309.
Memory cell 301, for storing the first corrected value, the second corrected value, the 3rd corrected value and the 4th corrected value；
First coupling unit 302, for being coupled out, from tested optical channel monitoring point, the optical signal that percentage is A；
Filter unit 303, the optical signal for being coupled out to the first coupling unit 302 with the first filtering information is filtered
Obtain the first filtering signal；The optical signal first coupling unit 302 being coupled out with the second filtering information is filtered obtaining
Two filtering signals；Wherein, the first filtering information includes centre wavelength and the channel width of tested optical channel；Second filtering information bag
Include centre wavelength and the OSNR reference bandwith of tested optical channel；
Second coupling unit 304, is B for being coupled out percentage in the first filtering signal of obtaining from filter unit 303
With two parts of beam splitting optical signals of C；Being coupled out percentage from the second filtering signal that filter unit 303 obtains is B and two parts of beam splitting of C
Optical signal；Wherein, A, B, C are all higher than 0 and are less than 1, C less than B, and C with B's and is 1；
Delayed interference unit 305, the percentage for being coupled out from the first filtering signal to the second coupling unit 304 is
The beam splitting optical signal of B carries out delayed interference；The percentage that second coupling unit 304 is coupled out from the second filtering signal is B
Beam splitting optical signal carry out delayed interference；
First power measurement unit 306, for being directed to, to delayed interference unit 305, the letter be coupled out in the first filtering signal
Signal after number processing carries out power measurement, obtains the first luminous power；Delayed interference unit 305 is directed in the second filtering signal
Signal after the signal transacting being coupled out carries out power measurement, obtains the 4th luminous power；
Second power measurement unit 307, for interfering delay cell to be directed in the first filtering signal to be coupled out to described
Information after signal transacting carries out power measurement, obtains the second luminous power；Second filtering letter is directed to described interference delay cell
Information after the signal transacting being coupled out in number carries out power measurement, obtains the 5th luminous power；
Described 3rd luminous power, the percentage for being coupled out for the first filtering signal to the second coupling unit 304 is C
Beam splitting optical signal carry out power measurement obtain the 3rd luminous power；Second filtering signal coupling is directed to the second coupling unit 304
The percentage going out is that the beam splitting optical signal of C carries out power measurement acquisition the 6th luminous power；
Computing unit 309, for the first corrected value of being stored according to memory cell 301 and the second corrected value, and first
The first luminous power, the second luminous power of the second power measurement unit 307 acquisition and the 3rd power that power measurement unit 306 obtains
The 3rd luminous power that measuring unit 308 obtains obtains by the performance number of light signal；The first school according to memory cell 301 storage
On the occasion of with the second corrected value, and the first power measurement unit 306 obtain the 4th luminous power, the second power measurement unit 307
6th luminous power of the 5th luminous power obtaining and the 3rd power measurement unit 308 acquisition obtains ASE noise power-value；According to obtaining
The performance number by light signal, ASE noise power-value, and OSNR reference bandwith obtain tested channel OSNR value.
It is preferred that
Filter unit 303, is further used for the first filtering information, transmitter terminal optical signal being filtered；With the first filter
Ripple information is filtered to the ASE noise that EDFA produces；With the second filtering information, transmitter terminal optical signal is filtered；With
Two filtering informations are filtered to the ASE noise that EDFA produces；
Delayed interference unit 305, is further used for carrying out delayed interference to the filtered optical signal of the first filtering information；
Carry out delayed interference to the filtered noise of the first filtering information；Prolong to the filtered optical signal of the second filtering information
Interfere late；Carry out delayed interference to the filtered noise of the second filtering information；
First power measurement unit 306, be further used for for first filtering information filtering optical signal to delayed interference
Outcome measurement obtains mutually long-armed power；Noise for the first filtering information filtering is mutually long-armed to the acquisition of delayed interference outcome measurement
Power；Optical signal for the second filtering information filtering obtains mutually long-armed power to delayed interference outcome measurement；For the second filter
The noise of ripple information filter obtains mutually long-armed power to delayed interference outcome measurement；
Second power measurement unit 307, be further used for for first filtering information filtering optical signal to delayed interference
Outcome measurement obtains cancellation arm power；Noise for the first filtering information filtering obtains cancellation arm to delayed interference outcome measurement
Power；Optical signal for the second filtering information filtering obtains cancellation arm power to delayed interference outcome measurement；For the second filter
The noise of ripple information filter obtains cancellation arm power to delayed interference outcome measurement；
Computing unit 309, be further used for for first filtering information filtering optical signal obtain mutually long-armed power and
The ratio of cancellation arm power as the first corrected value and triggers memory cell 301 and stores；For making an uproar of the first filtering information filtering
The mutually long-armed power that sound obtains and the ratio of cancellation arm power as the second corrected value and trigger memory cell 301 and store；For
The mutually long-armed power that the optical signal of the second filtering information filtering obtains and the ratio of cancellation arm power as the 3rd corrected value and touch
Send out memory cell 301 to store；The mutually long-armed power obtaining for the noise of the second filtering information filtering and the ratio of cancellation arm power
Value as the 4th corrected value and triggers memory cell 301 and stores.
Preferably it is characterised in that delayed interference unit 305 includes：Variable optical delay line unit 315 and optics phase shift list
Unit 325；
Variable optical delay line unit 315, for adjusting mutually long-armed and cancellation arm frequency response peak intervals；
Optics phase-shifting unit 325, for ensureing orthogonal of the signal phase of the mutually long-armed of delayed interference and the output of cancellation arm
Join.
It is preferred that
Filter unit 303 is tunable optical bandpass filter.
The unit of above-described embodiment can be integrated in one it is also possible to be deployed separately；A unit can be merged into, also may be used
To be further split into multiple subelements.
In sum, the application transmitting terminal optical signal and ASE noise are filtered by using two kinds of filtering informations and
Interferometry obtains corrected value, in optical channel monitoring point, monitored channel is filtered and delayed interference with two kinds of filtering informations
Measurement, in conjunction with the corresponding corrected value obtaining, obtains the power absolute value of optical signal and ASE noise, and then monitors OSNR.
The monitoring of OSNR relative ratio is converted to according to reduced value monitoring when implementing by the application, can be by signal spectrum
Distortion damage is considered as common-mode noise and is suppressed, thus improve the resistance that nonlinear impairments and cascade filtering effect are damaged,
Go out the OSNR of measured signal so as to online accurate measurements.
The above, the only preferred embodiment of the application, it is not intended to limit the protection domain of the application.All
Within spirit herein and principle, any modification, equivalent substitution and improvement made etc., should be included in the protection of the application
Within the scope of.
Claims (5)
1. a kind of OSNR OSNR monitoring method is it is characterised in that methods described includes：
It is coupled out the optical signal that percentage is A from tested optical channel monitoring point；
With the first filtering information, the optical signal being coupled out is filtered obtaining the first filtering signal, then from this first filtering signal
In be coupled out percentage be B and two parts of beam splitting optical signals of C, delayed interference is carried out simultaneously by the beam splitting optical signal for B to percentage
Measurement obtains the first luminous power and the second luminous power, and measurement percentage is that the beam splitting optical signal of C obtains the 3rd luminous power, and according to
First corrected value of storage and the second corrected value, and the first luminous power, the second luminous power and the acquisition of the 3rd luminous power obtaining
Performance number by light signal；
With the second filtering information, the optical signal being coupled out is filtered obtaining the second filtering signal, then from this second filtering signal
In be coupled out percentage be B and two parts of beam splitting optical signals of C, carry out delayed interference and survey by the beam splitting optical signal for B for the percentage
Amount obtains the 4th luminous power and the 5th luminous power, and measurement percentage is that the beam splitting optical signal of C obtains the 6th luminous power, and according to depositing
3rd corrected value of storage and the 4th corrected value, and it is spontaneous to obtain the 4th luminous power, the 5th luminous power and the acquisition of the 6th luminous power
Amplify radiation ASE noise power-value；
Wherein, A, B, C are all higher than 0 and are less than 1, C less than B, and C with B's and is 1；First filtering information includes tested optical channel
Centre wavelength and channel width；Second filtering information includes：The centre wavelength of tested optical channel and OSNR reference bandwith；
Tested channel is obtained according to the performance number by light signal obtaining, ASE noise power-value, and OSNR reference bandwith
OSNR value；
Wherein,
First corrected value of storage, the preparation method of the second corrected value, the 3rd corrected value and the 4th corrected value, including：
With the first filtering information, transmitter terminal optical signal is filtered, delayed interference is carried out to filtered optical signal, and right
Delayed interference outcome measurement obtains mutually long-armed power and cancellation arm power, calculates this mutually long-armed power and the ratio of cancellation arm power
As the first corrected value and store；
With the first filtering information, the ASE noise that erbium-doped optical fiber amplifier EDFA produces is filtered, filtered noise is entered
Row delayed interference, and mutually long-armed power and cancellation arm power are obtained to delayed interference outcome measurement, calculate this mutually long-armed power and
The ratio of cancellation arm power as the second corrected value and stores；
With the second filtering information, transmitter terminal optical signal is filtered, delayed interference is carried out to filtered optical signal, and right
Delayed interference outcome measurement obtains mutually long-armed power and cancellation arm power, calculates this mutually long-armed power and the ratio of cancellation arm power
As the 3rd corrected value and store；
With the second filtering information, the ASE noise that EDFA produces is filtered, delayed interference is carried out to filtered noise, and right
Delayed interference outcome measurement obtains mutually long-armed power and cancellation arm power, calculates this mutually long-armed power and the ratio of cancellation arm power
As the 4th corrected value and store；
Described the first corrected value according to storage and the second corrected value, and obtain the first luminous power, the second luminous power and the
Three luminous powers obtain by the performance number of light signal, including：
Wherein, PSIG_TESTIt is by the power of light signal
Value, α is the first corrected value, and β is the second corrected value, P1_TESTFor the first luminous power, P2_TESTFor the second luminous power, P3_TESTFor
Three luminous powers；
Described the 3rd corrected value according to storage and the 4th corrected value, and obtain the 4th luminous power, the 5th luminous power and the 6th
Luminous power obtains ASE noise power-value, including：
Wherein, PASE_TESTFor ASE noise power, α '
For the 3rd corrected value, β ' is the 4th corrected value, P '1_TESTFor the 4th luminous power, P '2_TESTFor the 5th luminous power, P '3_TESTFor
Six luminous powers；
Described according to obtain the performance number by light signal, ASE noise power-value, and OSNR reference bandwith obtain tested letter
The OSNR value in road, including：
Wherein, OSNR is the OSNR value of tested channel, BASE_TESTFor OSNR
Reference bandwith.
2. method according to claim 1 is it is characterised in that when carrying out described delayed interference, including：
Adjust mutually long-armed and cancellation arm frequency response peak intervals using variable optical delay line, ensure to postpone using optical phase device
The orthogonal coupling of signal phase of the mutually long-armed and cancellation arm output interfered.
3. a kind of OSNR OSNR monitoring device is it is characterised in that this device includes：Memory cell, the first coupling unit, filter
Ripple unit, the second coupling unit, delayed interference unit, the first power measurement unit, the second power measurement unit, the 3rd power are surveyed
Amount unit and computing unit；
Described memory cell, for storing the first corrected value, the second corrected value, the 3rd corrected value and the 4th corrected value；
Described first coupling unit, for being coupled out, from tested optical channel monitoring point, the optical signal that percentage is A；
Described filter unit, the optical signal for being coupled out to described first coupling unit with the first filtering information is filtered obtaining
Obtain the first filtering signal；It is filtered obtaining second with the optical signal that the second filtering information is coupled out to described first coupling unit
Filtering signal；Wherein, the first filtering information includes centre wavelength and the channel width of tested optical channel；Second filtering information includes
The centre wavelength of tested optical channel and OSNR reference bandwith；
Described second coupling unit, is B and C for being coupled out percentage in the first filtering signal of obtaining from described filter unit
Two parts of beam splitting optical signals；Being coupled out percentage from the second filtering signal that described filter unit obtains is B and two parts of beam splitting light of C
Signal；Wherein, A, B, C are all higher than 0 and are less than 1, C less than B, and C with B's and is 1；
Described delayed interference unit, the percentage for being coupled out from the first filtering signal to described second coupling unit is B
Beam splitting optical signal carry out delayed interference；The percentage that described second coupling unit is coupled out from the second filtering signal is B
Beam splitting optical signal carry out delayed interference；
Described first power measurement unit, for being directed to, to described delayed interference unit, the signal be coupled out in the first filtering signal
Signal after process carries out power measurement, obtains the first luminous power；Described delayed interference unit is directed in the second filtering signal
Signal after the signal transacting being coupled out carries out power measurement, obtains the 4th luminous power；
Described second power measurement unit, for interfering delay cell to be directed to the signal be coupled out in the first filtering signal to described
Information after process carries out power measurement, obtains the second luminous power；Described interference delay cell is directed in the second filtering signal
Information after the signal transacting being coupled out carries out power measurement, obtains the 5th luminous power；
Described 3rd power measurement unit, for the percentage that described second coupling unit is coupled out for the first filtering signal
Beam splitting optical signal for C carries out power measurement and obtains the 3rd luminous power；Second filtering signal is directed to described second coupling unit
The percentage being coupled out is that the beam splitting optical signal of C carries out power measurement acquisition the 6th luminous power；
Described computing unit, for the first corrected value of being stored according to described memory cell and the second corrected value, and described
The second luminous power and the described 3rd that first luminous power of one power measurement unit acquisition, described second power measurement unit obtain
The 3rd luminous power that power measurement unit obtains obtains by the performance number of light signal；According to the storage of described memory cell the 3rd
Corrected value and the 4th corrected value, and described first power measurement unit obtain the 4th luminous power, described second power measurement
The 5th luminous power that unit obtains and the 6th luminous power of described 3rd power measurement unit acquisition are derived from granting large radiation ASE
Noise power-value；Quilt is obtained according to the performance number by light signal obtaining, ASE noise power-value, and OSNR reference bandwith
Survey the OSNR value of channel；
Wherein,
Described filter unit, is further used for the first filtering information, transmitter terminal optical signal being filtered；With the first filtering
Information is filtered to the ASE noise that erbium-doped optical fiber amplifier EDFA produces；With the second filtering information to transmitter terminal optical signal
It is filtered；With the second filtering information, the ASE noise that EDFA produces is filtered；
Described delayed interference unit, is further used for carrying out delayed interference to the filtered optical signal of the first filtering information；Right
Delayed interference is carried out with the filtered noise of the first filtering information；Postpone to the filtered optical signal of the second filtering information
Interfere；Carry out delayed interference to the filtered noise of the second filtering information；
Described first power measurement unit, be further used for for first filtering information filtering optical signal to delayed interference result
Measurement obtains mutually long-armed power；Noise for the first filtering information filtering obtains mutually long-armed work(to delayed interference outcome measurement
Rate；Optical signal for the second filtering information filtering obtains mutually long-armed power to delayed interference outcome measurement；For the second filtering
The noise of information filter obtains mutually long-armed power to delayed interference outcome measurement；
Described second power measurement unit, be further used for for first filtering information filtering optical signal to delayed interference result
Measurement obtains cancellation arm power；Noise for the first filtering information filtering obtains cancellation arm work(to delayed interference outcome measurement
Rate；Optical signal for the second filtering information filtering obtains cancellation arm power to delayed interference outcome measurement；For the second filtering
The noise of information filter obtains cancellation arm power to delayed interference outcome measurement；
Described computing unit, is further used for mutually long-armed power and the cancellation obtaining for the optical signal of the first filtering information filtering
The ratio of arm power as the first corrected value and triggers described memory cell storage；Noise for the first filtering information filtering obtains
The mutually long-armed power obtaining and the ratio of cancellation arm power as the second corrected value and trigger described memory cell storage；For second
The mutually long-armed power that the optical signal of filtering information filtering obtains and the ratio of cancellation arm power as the 3rd corrected value and trigger institute
State memory cell storage；The mutually long-armed power obtaining for the noise of the second filtering information filtering and the ratio of cancellation arm power are made
For the 4th corrected value and trigger the storage of described memory cell；
Wherein, described computing unit, specifically for the first corrected value of being stored according to described memory cell and the second corrected value, with
And described first power measurement unit obtain the first luminous power, described second power measurement unit obtain the second luminous power and
When the 3rd luminous power that described 3rd power measurement unit obtains obtains the performance number by light signal,Wherein, PSIG_TESTIt is by the performance number of light signal,
α is the first corrected value, and β is the second corrected value, P1_TESTFor the first luminous power, P2_TESTFor the second luminous power, P3_TESTFor the 3rd luminous power；
The 3rd corrected value according to the storage of described memory cell and the 4th corrected value, and the 4th of described first power measurement unit acquisition
The 5th luminous power and the 6th smooth work(of described 3rd power measurement unit acquisition that luminous power, described second power measurement unit obtain
When rate is derived from granting large radiation ASE noise power-value,
Wherein, PASE_TESTFor ASE noise power, α ' is the 3rd corrected value, and β ' is the 4th corrected value, P '1_TESTFor the 4th luminous power,
P′2_TESTFor the 5th luminous power, P '3_TESTFor the 6th luminous power；According to the performance number by light signal obtaining, ASE noise work(
Rate value, and OSNR reference bandwith obtain tested channel OSNR value when,
Wherein, OSNR is the OSNR value of tested channel, BASE_TESTFor OSNR reference bandwith.
4. device according to claim 3 is it is characterised in that described delayed interference unit includes：Variable optical delay line list
Unit and optics phase-shifting unit；
Described variable optical delay line unit, for adjusting mutually long-armed and cancellation arm frequency response peak intervals；
Described optics phase-shifting unit, for ensureing the orthogonal coupling of signal phase of the mutually long-armed of delayed interference and the output of cancellation arm.
5. the device according to claim 3 or 4 it is characterised in that
Described filter unit is tunable optical bandpass filter.
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| CN109286436B (en) * | 2017-07-20 | 2021-04-30 | 中兴通讯股份有限公司 | Optical signal-to-noise ratio detection method, system, device and storage medium |
| US10256901B2 (en) | 2017-07-31 | 2019-04-09 | Huawei Technologies Co., Ltd. | Systems and methods for optical signal-to-noise ratio monitoring |
| CN108234019B (en) * | 2017-12-27 | 2020-10-30 | 复旦大学 | Method for testing additional noise power of erbium-doped fiber amplifier by dual-optical-path polarization balance |
| CN108365889B (en) * | 2018-02-28 | 2020-02-14 | 武汉光迅科技股份有限公司 | Method for improving OSNR accuracy of wavelength division multiplexing system |
| CN109696243B (en) * | 2018-11-23 | 2020-07-14 | 武汉光迅科技股份有限公司 | Optical noise measurement method and device and computer readable storage medium |
| CN110048770B (en) * | 2019-05-08 | 2021-08-24 | 武汉邮电科学研究院有限公司 | In-band optical signal-to-noise ratio monitoring method and module based on ROADM network |
| CN112217575B (en) * | 2019-07-12 | 2022-02-11 | 科大国盾量子技术股份有限公司 | Method and system for calibrating light intensity ratio of decoy state optical signal and signal state optical signal |
| CN115603803A (en) * | 2021-06-28 | 2023-01-13 | 中兴通讯股份有限公司（Cn） | Optical signal-to-noise ratio detection method and device and computer storage medium |
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