CN1275414C - Monitoring method and device for wave-length-division multiplexing optical signal/noise ratio - Google Patents
Monitoring method and device for wave-length-division multiplexing optical signal/noise ratio Download PDFInfo
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Abstract
The present invention discloses a method and a device for monitoring wavelength-division multiplexing optical signal/noise ratio, particularly a method and a device for monitoring optical signal/noise ratio, which relates to the optical signal/noise ratio monitoring technique of a transmission system of wavelength division multiplex (WDM) and optical add/drop multiplex (OADM). The device has a stand-alone type, a wave separator type, an add/drop multiplexer type and a wave synthesizer type, and is composed of a signal, noise separation / noise filtering module, a wavelength-division multiplexing channel optical power detector, a photodetection diode /a logarithmic amplification circuit, an SCM, a data collection interface, an optical coupler, an optical wave separator, an optical add/drop multiplexer and an optical wave synthesizer, wherein the signal, noise separation / noise filtering module has a prefix type, a postposition type and a parallel type, and is composed of a film optics filter plate / a fiber grating filter. Because the device does not have a moving part and an environment temperature sensing device, the device has the advantages of low power consumption and small volume. Accordingly, the device has low requirements of work environment and is easy to integrate into a wavelength-division multiplexer.
Description
Technical field
The present invention relates to the technology of the optical signal-to-noise ratio monitoring of a kind of wavelength division multiplexing (WDM) and Optical Add Drop Multiplexer (OADM) transmission system; Specifically, the method and the device thereof that relate to optical signal-to-noise ratio monitoring.
Background technology
So-called WDM transmission system is exactly to utilize the separate non-interfering principle of different optical wavelength in an optical fiber, transmits the signal of multichannel various information source, to reach the purpose of expansion transmission capacity.In order to improve the transmission range of equipment, reduce the manufacturing cost of equipment, often use the optical fiber amplifying technique in the system in large quantities.Because light amplification is the simulation process technology in light territory, so just make the digital light transmission system present the characteristic of many analogue systems, make the transmission performance of system and the influence that transmission quality has been subjected to noise sources such as image intensifer, and present the noise storage phenomenon, also be subjected to the influence that the system line attenuation changes, and the trend of work scope of equipment is little than the dynamic range of pure digi-tal transmission system [as synchronous transmission series (SDH) transmission system of no light amplification].Make Optical Signal To Noise Ratio in wavelength-division multiplex system, become a main restricting factor of restriction system transmission range and transmission quality.The Optical Signal To Noise Ratio of monitoring system receiving terminal just becomes understanding system works performance, a crucial technological means of assessing signal transmission quality like this.
In the WDM transmission system, generally all adopt equipments and devices such as spectroanalysis instrument, optical channel performance monitoring module to test to the variation of Optical Signal To Noise Ratio.
1) spectroanalysis instrument has characteristics such as powerful, that measuring accuracy is high, dynamic range is big, automaticity is strong; But it also has problems such as bulky, that power consumption is high, working environment is had relatively high expectations, cost an arm and a leg simultaneously; Generally only be used for test, check and accept or calibration.
2) optical channel performance monitoring module has the technical scheme of two kinds of specific implementations at present:
1. a kind of is to adopt Fa Buli-Perot etalon tool (F-P) to scan wavelength division multiplexing work spectrum, with its scanning optical spectrum of optical power monitoring, use digital signal processor (DSP) to carry out data analysis again and handle and calculate Optical Signal To Noise Ratio, signal light power and wavelength of optical signal; 2. another kind of method then adopts grating beam splitting, uses infrared light electric charge bucket chain linear array (CCD) scanning probe spectrum again, carries out data analysis with DSP then and handles and calculate Optical Signal To Noise Ratio, signal light power and wavelength of optical signal.They have the advantages that volume is little, lower, low in energy consumption to the operational environment requirement, price is low than spectroanalysis instrument, are easy to be integrated in the WDM, do online optical property monitoring and use.But its also has simultaneously, and the test dynamic range is little, precision is low, technical sophistication, price are not cheap yet, and the at present domestic problem such as this type of technology of not grasping as yet.
Based on above analysis, how simple, low cost, high accuracy, just become WDM transmission system monitoring system key light Channel Transmission performance widely, a key factor of raising system running quality with bigger dynamic range monitoring Optical Signal To Noise Ratio technical parameter.
Summary of the invention
The purpose of this invention is to provide a kind of wavelength division multiplexing Optical Signal To Noise Ratio monitoring method and device thereof, specifically, is to solve following technical problem:
Described Optical Signal To Noise Ratio is exactly the ratio of the optical noise spectrum signal of every passage luminous power light wave strong point of living in it in the WDM transmission system.Be distinguishing signal and noise, the mean value that generally will be close to the optical noise spectrum on wavelength of optical signal both sides is pointed out to being equivalent to the optical noise spectral power value at wavelength of optical signal place.Because the flashlight of WDM is very close on spectral domain, and the noise spectrum luminous power is very low again, when monitoring noise spectrum signal changes, very easily be subjected to the influence of the variation of signal light power.Therefore, purpose of the present invention also has:
The one, as how bigger dynamic range, higher adjacent channel isolation is surveyed every channel noise spectrum luminous power just becomes the key that solves the Optical Signal To Noise Ratio performance monitoring.In fact there is such problem too in optical channel performance monitoring module.
The 2nd, also need to solve the calibration problem of luminous power and Optical Signal To Noise Ratio.
The object of the present invention is achieved like this:
Because with great dynamic range, the technical threshold that higher adjacent channel isolation is monitored noise light power is difficult to go beyond, we have utilized, and the noise spectrum form remains unchanged substantially in actual WDM engineering, only have the characteristics of the variation of lifting and inclination, come the metamorphosis of the whole noise spectrum of perception with the variation of monitoring noise spectrum platform, calibration parameter with luminous power and Optical Signal To Noise Ratio serves as according to the situation of change of calculating each optical channel noise spectrum again, and then realizes the optical signal-to-noise ratio monitoring to each optical channel.
The monitoring of optical noise spectrum platform is taken to should get 1 (enlarging some coverages) spectral wavelength monitoring point less on the noise spectral line.At first respectively monitor a noise light signal in the outside, the left side and the outside, the right in wavelength division multiplexing spectrum zone with the high-isolation filter of broad light passband spectrum width.Because they are far away with the frequency domain of WDM optical transmission signal distance, and have adopted the filter of passband spectrum width broad, so bigger noise monitoring dynamic range and the higher signal isolation of acquisition easily.These two noise monitoring points are reference noise spectrum platform of the present invention monitoring point.Shown in the A among Fig. 1, B, block curve is depicted as the WDM curve of spectrum of actual measurement among the figure, and dashed curve is depicted as the filter filtering passband profile of each noise monitoring point.For improving the monitoring accuracy to the metamorphosis of noise monitoring platform, can relatively come according to the equilibrium of Cost And Performance suitably increases by 1 to 5 noise monitoring point, shown in the C among the figure, D, E.The noise monitoring point that increases is arranged in the WDM SPECTRAL REGION, takes out noise between the light signal with arrowband high-isolation filter, monitors.Monitor wavelength-division channel light power simultaneously, and preserve the calibration correction parameter that calculates when carrying out Equipment Alignment.
Measuring at first needs monitoring device is calibrated, and calibration steps is as follows:
1) calibrates each passage optical power monitoring value, to guarantee himself and to be the measuring accuracy of the Optical Signal To Noise Ratio of foundation with it;
2) after wdm system Installation and Debugging to be monitored are finished, get actual measured signal, test each passage Optical Signal To Noise Ratio of its reality with high-precision spectroanalysis instrument, test result Input Monitor Connector device;
3) signal to be monitored is sent into monitoring device, equipment can separate and monitor the noise power of each passage luminous power and each noise monitoring point automatically;
4) single-chip microcomputer takes out the noise power monitor value that each passage optical signal power monitor value and each optical noise monitoring point monitor from each monitoring port, and the calibration testing Optical Signal To Noise Ratio data together with input are saved in memory ready;
5) single-chip microcomputer calculates the noise spectrum luminous power of each passage by each the passage Optical Signal To Noise Ratio data of input and the signal light power of each passage that monitors;
6) by the noise power of each monitoring point and the wavelength value of noise monitoring point, with the noise platform parameter at each channel signal wavelength place of interpolation calculation.When noise monitoring point only has two, can adopt linear interpolation algorithm, if the monitoring point then should consider better interpolation algorithm more than two, as Lagrange's interpolation etc.;
7) the noise spectrum luminous power with each passage compares with the noise platform parameter that adopts interpolation algorithm to calculate each the channel signal wavelength place that obtains, and obtains the noise platform relativity shift correction at each channel signal wavelength place;
8) preserve this relativity shift correction, the corrected parameter when testing as later reality is finished calibration.
Actual when carrying out optical signal-to-noise ratio monitoring, monitoring method is as follows:
1) light signal and optical noise are sent in separately the power detector through signal, noise separation and noise filtering module, export optical power monitoring signal separately;
2) single-chip microcomputer takes out each passage optical signal power monitor value and the noise power monitor value that each optical noise monitoring point monitors from each monitoring port, is saved in memory ready.
3) by the noise power of each monitoring point and the wavelength value of noise monitoring point, the noise platform parameter at identical each channel signal wavelength place of interpolation calculation with calibration calculations the time;
The noise platform relativity shift correction at each the channel signal wavelength place that preserves during 4) with calibration is compared with the noise platform parameter at each the channel signal wavelength place that adopts interpolation calculation to obtain, and obtains the noise power-value at each channel signal wavelength place;
5) the monitoring Optical Signal To Noise Ratio of comparing and to obtain each passage with each the path optical signal power monitor value and the noise power-value at each channel signal wavelength place;
6) preserve this Optical Signal To Noise Ratio, so that an optical signal-to-noise ratio monitoring circulation is finished in host computer inquiry or directly output;
7) said process repeatedly, the Optical Signal To Noise Ratio of constantly monitoring input signal changes.
Owing in wavelength-division multiplex system, on equipment such as wave multiplexer, channel-splitting filter and optical add/drop multiplexer, all must carry out every channel light power monitoring, so the present invention combines with these devices, not only can reduce cost, but also can reduce equipment volume, reduce power consumption.To system network management reporting system Optical Signal To Noise Ratio performance, improve the safety in operation of equipment in real time.
The present invention has the following advantages and good effect:
1) the present invention has only adopted the fixed wave length high-isolation filtering technique of technology maturation, and does not have the motion sweep unit, the maturity that possesses skills height, and device easily obtains, and is with low cost, the advantage of reliable operation.
2) because the present invention has adopted the wide range structure on the filter of reference noise spectrum platform monitoring point, can greatly improve the percent of pass of noise signal, strengthened the signal strength signal intensity of noise level, optical power monitoring can adopt logarithm amplifying technique or stepping amplifying technique in addition, has greatly improved the dynamic range of signal monitoring.
3) rule that changes according to WDM transmission system Optical Signal To Noise Ratio, this device is being used for merging the monitoring Optical Signal To Noise Ratio with optical branching filter, optical multiplexer, optical add/drop multiplexer, or when being fixed in the Optical Signal To Noise Ratio of certain monitoring point monitoring system of system as a self-contained unit, has very high optical signal-to-noise ratio monitoring precision.
4) because this device does not have moving component and ambient temperature Sensitive Apparatus, and low in energy consumption, volume is little, thus low to the operational environment requirement, be easy to be integrated in the WDM.
Description of drawings
Fig. 1-wavelength division multiplexing Optical Signal To Noise Ratio spectral line and noise monitoring point distribution schematic diagram;
Fig. 2-self optical signal-to-noise ratio monitoring device block diagram,
Fig. 3 .1-prefix type decomposition module figure,
The rearmounted pattern piece of Fig. 3 .2-exploded view,
Fig. 3 .3-parallel connection type decomposition module figure;
Fig. 4-partial wave type optical signal-to-noise ratio monitoring device block diagram;
Fig. 5-add drop multiplex type optical signal-to-noise ratio monitoring is put block diagram;
Fig. 6-wave multiplexer type optical signal-to-noise ratio monitoring device block diagram.
Wherein:
A, B, C, D, each optical noise platform monitoring filter numbering of E-;
1-signal, noise separation/noise filtering module are called for short module, are divided into:
1.1-the prefix type module, the rearmounted pattern piece of 1.2-, 1.3-parallel connection type module;
2-wavelength division multiplexing access optical power monitor is called for short monitor, is used to monitor the signal light power of each passage;
3-photodetection diode (PIN or PD)/logarithm amplifying circuit;
4-single-chip microcomputer and data acquisition interface thereof;
The 5-input optical signal;
6-light data output channel, i.e. each luminous power and Optical Signal To Noise Ratio light data output channel;
Parameters such as 7-calibration;
8-Film Optics filter plate or fiber grating filter are called for short filter;
The 9-noise light;
10-closes the road flashlight;
11-shunting sign light;
The 12-optical coupler;
The 13-optical branching filter;
The 14-optical add/drop multiplexer;
The 15-optical multiplexer.
Embodiment
Describe in detail below in conjunction with drawings and Examples.
1, wavelength division multiplexing Optical Signal To Noise Ratio monitoring method
Following concrete operations step is arranged:
A, with high accuracy spectroanalysis instrument detection calibration signal (utilizing actual measured signal), obtain Optical Signal To Noise Ratio data OSNR accurately
N, and the input single-chip microcomputer;
B, with calibrating signal input test device, monitor the luminous power P of each light path
N, each noise platform monitoring point power NPM;
C, assign Equipment Alignment instruction, single-chip microcomputer calculates the noise power of each path: N
N=P
N-OSNR
N
D, according to the central wavelength lambda of each path
N, each noise platform monitoring point central wavelength lambda
M, and the monitoring power NP of each noise platform monitoring point
M, with the noise plateau value NA of each path of interpolation calculation
NWhen noise platform monitoring point was one, each channel noise plateau value was treated as the monitoring power of monitoring point; When the monitoring point is two, adopt linear interpolation method; During more than two, adopt linear interpolation method or other high-order interpolation method, as Lagrange's interpolation etc.;
E, each channel noise calibration correction parameters C
N=N
N-NA
N, preserve this correction parameter, so that call during actual monitoring later on, finish calibration then;
F, with measured signal input test device, monitor the luminous power P of each light path
N', the power NP of each noise platform monitoring point
M';
G, according to the wavelength X of each passage
N, each noise platform monitoring point central wavelength lambda
M, and the power NP of each noise platform monitoring point
M', with the noise plateau value NA of each passage of interpolation calculation
N' (adopting interpolation computing method identical when calibrating);
H, with each each channel noise plateau value of channel noise calibration correction parameter correction, obtain the noise power N of each path
N'=NA
N'+C
N
The luminous power of the noise power of each path that I, basis calculate and each light path that monitors is calculated each passage Optical Signal To Noise Ratio OSNR
N'=P
N'-N
N';
J, output optical signal-to-noise ratio monitoring data, F～J step is repeatedly monitored repeatedly then.
Attention: in each amount of calculation in the above-mentioned steps, luminous power unit is dBm, and the unit of Optical Signal To Noise Ratio and calibration correction parameter is dB.If luminous power unit is mW, Optical Signal To Noise Ratio and calibration correction parameter do not have unit, then should correspondingly change addition into multiplication in each computing formula, and subtraction changes division into.
2, wavelength division multiplexing Optical Signal To Noise Ratio monitoring device
1) the self optical signal-to-noise ratio monitoring device of embodiment 1 as shown in Figure 2, form by following parts, its annexation is: signal, noise separation/noise filtering module 1, and each noise bracket signal that a part is promptly told is connected with single-chip microcomputer and data acquisition interface 4 thereof by photodetection diode/logarithm amplifying circuit 3; Residual signal behind each noise bracket signal that another part is promptly told is connected with single-chip microcomputer and data acquisition interface 4 thereof by wavelength division multiplexing access optical power monitor 2.The accurate Optical Signal To Noise Ratio data and instruction of calibration usefulness is then directly sent into single-chip microcomputer.
Its operation principle is: input optical signal 5 is decomposed into the noise light and the flashlight of each noise monitoring point through signals, noise separation/noise filtering module 1, and wherein the noise light of each monitoring point is given each photodetection diode/logarithm amplifying circuit 3 that noise power monitors and carried out optical power monitoring and amplification; Flashlight is then given wavelength division multiplexing access optical power monitor 2 and is carried out each optical channel optical power monitoring; Noise that these are monitored and signal light power level are given single-chip microcomputer and data acquisition interface 4 carries out data acquisition then, and carry out calculation process jointly with the parameters such as calibration 7 of input, then monitoring result are sent light data output channel 6.
Prefix type module 1.1 is composed in series by the noise light traffic filter 8 of each noise monitoring point shown in Fig. 3 .1, and each path signal is exported by reflection end.They will meet the noise light signal 9 that requires themselves and leach, and other light signal reflection output is at last with other useless noise signal and close road flashlight 10 and export by reflection end.Its operation principle is: input optical signal 5 is exported through the noise light 9 that each filter 8 of connecting leaches each noise monitoring point, and other each flashlight then is reflected into and closes 10 outputs of road flashlight.
Rearmounted pattern piece 1.2 is shown in Fig. 3 .2, and by each path optical signal filtering device 8 series connection, each noise light traffic filter 8 of series connection is given in its last reflection output again.Its operation principle is: input optical signal 5 leaches 11 outputs of shunting sign light through each path optical signal filtering device 8 of series connection, and the noise light traffic filter 8 of again noise signal that reflects being given series connection leaches noise light 9 outputs of each noise monitoring point.
Parallel connection type module 1.3 is composed in series by the noise light traffic filter 8 of a coupler 12 and each noise monitoring point shown in Fig. 3 .3.Its operation principle is: input signal is exported to the noise light 9 that the filter 8 that closes road flashlight 10 and series connection leaches each noise monitoring point respectively through optical coupler 12, so that output.
2) the partial wave type optical signal-to-noise ratio monitoring device of embodiment 2 as shown in Figure 4, form by following parts, its annexation is: signal, noise separation/noise filtering module 1, and each noise bracket signal of promptly telling of a part is connected with single-chip microcomputer and data acquisition interface 4 thereof by 3 groups of photodetection diodes/logarithm amplifying circuit; Residual signal behind each noise bracket signal that another part is promptly told 3 groups of photodetection diodes by optical branching filter 13,12 groups of optical couplers, noise and flashlight/logarithm amplifying circuit successively is connected with single-chip microcomputer and data acquisition interface 4 thereof.The accurate Optical Signal To Noise Ratio data and instruction of calibration usefulness is then directly sent into single-chip microcomputer.
Its operation principle is: input optical signal 5 is through signal, noise separation/noise filtering module 1, the noise light that decomposites is given photodetection diode/logarithm amplifying circuit group 3 of being responsible for the noise light power monitoring, close the road light signal and give optical branching filter 13, each passage light signal that optical branching filter 13 decomposites is after optical coupler 12 beam split, each noise bracket signal that a part is promptly told is exported to other system processing unit and is handled, residual signal behind each noise bracket signal that another part is promptly told is given photodetection diode/logarithm amplifying circuit group 3 of being responsible for the monitoring of passage optical signal power, its output level is with the noise monitoring level, give single-chip microcomputer and data acquisition interface 4 carries out data acquisition, and with the input parameters such as calibration 7 carry out calculation process jointly, then monitoring result is sent light data output channel 6.
3) the add drop multiplex type optical signal-to-noise ratio monitoring of embodiment 3 is put as shown in Figure 5, form by following parts, its annexation is: signal, noise separation/noise filtering module 1, and each noise bracket signal of promptly telling of a part is connected with single-chip microcomputer and data acquisition interface 4 thereof by 3 groups of photodetection diodes/logarithm amplifying circuit; Residual signal behind each noise bracket signal that another part is promptly told is connected with single-chip microcomputer and data acquisition interface 4 thereof by optical add/drop multiplexer 14, optical coupler 12, photodetection diode/logarithm amplifying circuit group 3 successively.The accurate Optical Signal To Noise Ratio data and instruction of calibration usefulness is then directly sent into single-chip microcomputer.
Its operation principle is: input optical signal 5 is given signal, noise separation/noise filtering module 1, the noise light that decomposites is given photodetection diode/logarithm amplifying circuit group 3 of being responsible for the noise light power monitoring, close the road light signal and give optical add/drop multiplexer 14, each time talking path light signal that it decomposites is after optical coupler 12 beam split, each noise bracket signal that a part is promptly told is exported to other system processing unit and is handled, and the residual signal behind each noise bracket signal that another part is promptly told is given photodetection diode and the logarithm amplifying circuit group 3 of being responsible for the monitoring of passage optical signal power.The light of last words optical channel is after optical coupler 12 beam split, a part is exported to optical add/drop multiplexer 14 and is gone up the words processing, another part is given photodetection diode/logarithm amplifying circuit group 3 of being responsible for the monitoring of passage optical signal power, its output level is with following words optical channel optical power monitoring level and noise monitoring level, give single-chip microcomputer and data acquisition interface 4 carries out data acquisition, and with the input parameters such as calibration 7 carry out calculation process jointly, then monitoring result is sent light data output channel 6.
4) the wave multiplexer type optical signal-to-noise ratio monitoring device of embodiment 4 as shown in Figure 6, form by following parts, its annexation is: optical coupler 12, each noise bracket signal that its part is promptly told is connected with optical multiplexer 15, and the residual signal behind each noise bracket signal that another part is promptly told is connected with single-chip microcomputer and data acquisition interface 4 thereof by photodetection diode/logarithm amplifying circuit group 3; Signal, noise separation/noise filtering module 1 are connected with single-chip microcomputer and data acquisition interface 4 thereof by photodetection diode/logarithm amplifying circuit 3.The accurate Optical Signal To Noise Ratio data and instruction of calibration usefulness is then directly sent into single-chip microcomputer.
Its operation principle is: after each channel input signal light 5 is given optical coupler 12 beam split, each noise bracket signal that a part is promptly told is exported to optical multiplexer 15 and is closed ripple output 10, residual signal behind each noise bracket signal that another part is promptly told is given photodetection diode/logarithm amplifying circuit group 3 of being responsible for the monitoring of passage optical signal power, each passage optical level of its output is given single-chip microcomputer and data acquisition interface 4 thereof, amplify through outside other device, beam split or the road light signal of directly being exported by optical multiplexer that closes are given signal, noise separation and noise filtering module 1, the noise light that decomposites is given photodetection diode/logarithm amplifying circuit group 3 of being responsible for the noise light power monitoring, gives single-chip microcomputer and data acquisition interface 4 thereof.Single-chip microcomputer and data acquisition interface 4 thereof, each noise monitoring signal level and each channel signal optical level carried out data acquisition after, the parameters such as calibration 7 that merge input are carried out calculation process jointly, then monitoring result are sent light data output channel 6.
Claims (6)
1, a kind of wavelength division multiplexing Optical Signal To Noise Ratio monitoring method is characterized in that having following operating procedure:
A, usefulness high accuracy spectroanalysis instrument detection calibration signal promptly utilize actual measured signal, obtain Optical Signal To Noise Ratio data OSNR accurately
N, and the input single-chip microcomputer;
B, with calibrating signal Input Monitor Connector device, monitor the luminous power P of each light path
N, each noise platform monitoring point power NP
M
C, assign Equipment Alignment instruction, single-chip microcomputer calculates the noise power of each path: N
N=P
N-OSNR
N
D, according to the central wavelength lambda of each path
N, each noise platform monitoring point central wavelength lambda
M, and the monitoring power NP of each noise platform monitoring point
M, with the noise plateau value NA of each path of interpolation calculation
NWhen noise platform monitoring point was one, each channel noise plateau value was treated as the monitoring power of monitoring point; When the monitoring point is two, adopt linear interpolation method; During more than two, adopt linear interpolation method or other high-order interpolation method, as Lagrange's interpolation etc.;
E, each channel noise calibration correction parameters C
N=N
N-NA
N, preserve this correction parameter, so that call during actual monitoring later on, finish calibration then;
F, with measured signal input test device, monitor the luminous power P of each light path
N', the power NP of each noise platform monitoring point
M';
G, according to the wavelength X of each passage
N, each noise platform monitoring point central wavelength lambda
M, and the power NP of each noise platform monitoring point
M', with the noise plateau value NA of each passage of interpolation calculation
N', promptly adopt interpolation computing method identical when calibrating;
H, with each each channel noise plateau value of channel noise calibration correction parameter correction, obtain the noise power N of each path
N'=NA
N'+C
N
The luminous power of the noise power of each path that I, basis calculate and each light path that monitors is calculated each passage Optical Signal To Noise Ratio OSNR
N'=P
N'-N
N';
J, output optical signal-to-noise ratio monitoring data, F～J step is repeatedly monitored repeatedly then;
In each amount of calculation in the above-mentioned steps, luminous power unit is dBm, and the unit of Optical Signal To Noise Ratio and calibration correction parameter is dB; If luminous power unit is mW, Optical Signal To Noise Ratio and calibration correction parameter do not have unit, then should correspondingly change addition into multiplication in each computing formula, and subtraction changes division into.
2, implement first kind of self wavelength division multiplexing Optical Signal To Noise Ratio monitoring device of claim 1 described method, it is characterized in that forming by following parts, its annexation is: signal, noise separation/noise filtering module (1), and each noise bracket signal that a part is promptly told is connected with single-chip microcomputer and data acquisition interface (4) thereof by photodetection diode/logarithm amplifying circuit (3) group; Residual signal behind each noise bracket signal that another part is promptly told is connected with single-chip microcomputer and data acquisition interface (4) thereof by wavelength division multiplexing access optical power monitor (2); The accurate Optical Signal To Noise Ratio data and instruction of calibration usefulness is then directly sent into single-chip microcomputer.
3, implement second kind of partial wave type wavelength division multiplexed light signal to noise ratio monitoring device of claim 1 described method, it is characterized in that forming by following parts, its annexation is: signal, noise separation/noise filtering module (1), and each noise bracket signal that a part is promptly told is connected with single-chip microcomputer and data acquisition interface (4) thereof by photodetection diode/logarithm amplifying circuit (3) group; Residual signal behind each noise bracket signal that another part is promptly told is connected with single-chip microcomputer and data acquisition interface (4) thereof with photodetection diode/logarithm amplifying circuit (3) group of flashlight by optical branching filter (13), optical coupler (12) group, noise; The accurate Optical Signal To Noise Ratio data and instruction of calibration usefulness is then directly sent into single-chip microcomputer.
4, implement the third add drop multiplex type wavelength division multiplexed light signal to noise ratio monitoring device of claim 1 described method, it is characterized in that forming by following parts, its annexation is: signal, noise separation/noise filtering module (1), and each noise bracket signal that a part is promptly told is connected with single-chip microcomputer and data acquisition interface (4) thereof by photodetection diode/logarithm amplifying circuit (3) group; Residual signal behind each noise bracket signal that another part is promptly told is connected with single-chip microcomputer and data acquisition interface (4) thereof by optical add/drop multiplexer (14), optical coupler (12) group, photodetection diode/logarithm amplifying circuit (3) group successively; The accurate Optical Signal To Noise Ratio data and instruction of calibration usefulness is then directly sent into single-chip microcomputer.
5, implement the 4th kind of wave multiplexer type wavelength division multiplexing Optical Signal To Noise Ratio monitoring device of claim 1 described method, it is characterized in that forming by following parts, its annexation is: optical coupler (12) group, each noise bracket signal that its part is promptly told is connected with optical multiplexer (15), and the residual signal behind each noise bracket signal that another part is promptly told is connected with single-chip microcomputer and data acquisition interface (4) thereof by photodetection diode/logarithm amplifying circuit (3) group; Signal, noise separation/noise filtering module (1) are connected with single-chip microcomputer and data acquisition interface (4) thereof by photodetection diode/logarithm amplifying circuit (3) group; The accurate Optical Signal To Noise Ratio data and instruction of calibration usefulness is then directly sent into single-chip microcomputer.
6, by claim 2,3,4,5 described first kind, second kind, the third, the 4th kind of wavelength division multiplexing Optical Signal To Noise Ratio monitoring device, it is characterized in that module (1) is made up of following parts, its annexation is:
Or when being prefix type module (1.1), be composed in series by the noise light traffic filter (8) of each noise monitoring point, each path signal is exported by reflection end;
Or when being rearmounted pattern piece (1.2), by each path optical signal filtering device (8) series connection, the noise light traffic filter (8) of each noise monitoring point of series connection is given in its last reflection output again;
Or when being parallel connection type module (1.3), be composed in series by the noise light traffic filter (8) of a coupler (12) and each noise monitoring point.
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| CN1305245C (en) * | 2004-04-12 | 2007-03-14 | 武汉光迅科技股份有限公司 | Optical signal noise ratio measuring method and appliances in close wave division multiplex system |
| JP4198727B2 (en) * | 2006-05-29 | 2008-12-17 | シャープ株式会社 | Tuner, digital demodulator, control method thereof, program for digital demodulator, recording medium recording program for digital demodulator, and digital receiver |
| CN101119174B (en) * | 2006-07-31 | 2011-03-02 | 中兴通讯股份有限公司 | Method for testing signal-to-noise ratio of wavelength division multiplexing system |
| CN102970099B (en) * | 2012-10-30 | 2015-04-15 | 武汉邮电科学研究院 | Reconfigurable optical add-drop multiplexer (ROADM) node, optical wavelength correction frequency shifter and implementation method |
| CN109687905A (en) * | 2019-01-24 | 2019-04-26 | 国网上海市电力公司 | A kind of intelligent substation communication link abnormal state detection system |
| CN114244430B (en) * | 2021-12-17 | 2023-06-27 | 武汉光迅电子技术有限公司 | Method and device for detecting quality of EDFA optical signal |
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