CN104883220A - Optical signal-to-noise ratio monitoring method and device thereof - Google Patents
Optical signal-to-noise ratio monitoring method and device thereof Download PDFInfo
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Abstract
The invention provides an optical signal-to-noise ratio monitoring method and a device thereof. The method comprises the steps of measuring the first optical power of a to-be-monitored optical signal; after bandpass filtering is performed on the to-be-monitored optical signal, measuring the second optical power of the to-be-monitored optical signal after bandpass filtering; and determining the signal-to-noise ratio of the to-be-monitored optical signal according to the first optical power, the second optical power, the filtering coefficient of bandpass filtering to the optical signal and the filtering coefficient of bandpass filtering to the noise. The optical signal-to-noise ratio monitoring method and the device realize optical signal-to-noise ratio monitoring of the received optical signal without modification of a transmitter or data transmission influence and without affecting data transmission.
Description
Technical field
The present invention relates to optical fiber transmission technique field, particularly a kind of OSNR Monitoring Method and a kind of optical signal-to-noise ratio monitoring device.
Background technology
Along with amount of communication data growing of the Internet, optical fiber transmission network is just striding forward high spectrum utilization, narrow channel separation, long distance transmission, high bit rate and transparent switching epoch.But the dynamic transmission system of the high speed under the New Times brings much new challenge to network management.Therefore, the optical information networks that may be used for fill-in light network management starts the attention attracting more and more people.In numerous monitoring parameters, Optical Signal To Noise Ratio (Optical Signal-to-Noise Ratio, OSNR) monitoring the most urgently wishes to realize.This is because Optical Signal To Noise Ratio directly can have influence on the error rate of transmission system.The earliest for single-channel transmission system, Optical Signal To Noise Ratio can use spectrometer to read noise power outside band to monitor Optical Signal To Noise Ratio simply.Along with fiber optic transmission system enters the wavelength division multiplexing epoch, out-of-band noise can multiplexing with the process of demultiplexing in by filtering, thus make this method become impracticable.Therefore, in-band noise monitoring method is studied widely.Existing in-band noise monitoring mode monitors Optical Signal To Noise Ratio based on the monitoring technology of pilot tone, but this method needs to modify to transmitter, and can by the impact of other factors, with data-signal mutually interference the quality transmitting data can be caused to reduce.
Summary of the invention
Based on this, for above-mentioned problems of the prior art, the object of the present invention is to provide a kind of OSNR Monitoring Method and a kind of optical signal-to-noise ratio monitoring device, it when not modifying to transmitter, directly can carry out the monitoring of Optical Signal To Noise Ratio to received light signal.
For achieving the above object, one embodiment of the present of invention by the following technical solutions:
A kind of OSNR Monitoring Method, comprises step:
Measure the first luminous power treating light signal;
Carry out after bandpass filtering to described until light signal, the second luminous power treating light signal after measuring tape pass filter;
The Optical Signal To Noise Ratio of light signal is treated described according to described first luminous power, the second luminous power and bandpass filtering the filter factor of light signal, the filter factor of noise being determined.
A kind of optical signal-to-noise ratio monitoring device, comprises the fiber coupler that light signal is treated in access, the first light power meter, the band pass filter that are connected with the output of described fiber coupler respectively, and the second light power meter be connected with described band pass filter.
According to the scheme of the invention described above embodiment, its be record until light signal the first luminous power and treat light signal carry out bandpass filtering after the second luminous power after, based on the filter factor of band pass filter to light signal, the filter factor of noise, in conjunction with the first luminous power, second luminous power calculates the Optical Signal To Noise Ratio determining to treat light signal, owing to embodying the filter factor of band pass filter in the second luminous power, thus by the first luminous power, after second luminous power is combined with filter factor, the Optical Signal To Noise Ratio determined and treat light signal can be calculated easily, achieve and transmitter is not being modified, optical signal-to-noise ratio monitoring to received optical signal when not affecting transfer of data.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of OSNR Monitoring Method embodiment of the present invention;
Fig. 2 is the structural representation of optical signal-to-noise ratio monitoring device embodiment one of the present invention;
Fig. 3 is the structural representation of optical signal-to-noise ratio monitoring device embodiment two of the present invention;
Fig. 4 is experiment and the calculated results schematic diagram for the treatment of light signal monitoring in a concrete example;
Fig. 5 treats light signal under different dispersion values to the accurate sex schematic diagram of optical signal-to-noise ratio monitoring in a concrete example;
Fig. 6 treats light signal under the impact of polarization mode dispersion in various degree to the accurate sex schematic diagram of optical signal-to-noise ratio monitoring in a concrete example;
Fig. 7 is the degree of polarization experiment of optical signal-to-noise ratio monitoring and the calculated results schematic diagram when 0.1 and 0.3 respectively of the noise of partial polarization in a concrete example.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that embodiment described herein only in order to explain the present invention, do not limit protection scope of the present invention.
The schematic flow sheet of an OSNR Monitoring Method of the present invention embodiment has been shown in Fig. 1.As shown in Figure 1, the method in the present embodiment comprises step:
Step S101: measure the first luminous power treating light signal;
Step S102: carry out after bandpass filtering until light signal to above-mentioned, the second luminous power treating light signal after measuring tape pass filter;
Step S103: the above-mentioned Optical Signal To Noise Ratio treating light signal is determined to the filter factor of light signal and the filter factor of noise according to above-mentioned first luminous power, the second luminous power and bandpass filtering.
According to the OSNR Monitoring Method of the invention described above embodiment, its be record until light signal the first luminous power and treat light signal carry out bandpass filtering after the second luminous power after, based on the filter factor of bandpass filtering to light signal and the filter factor of noise, in conjunction with the first luminous power, second luminous power calculates the Optical Signal To Noise Ratio determining to treat light signal, owing to embodying the filter factor of bandpass filtering in the second luminous power, thus by the first luminous power, after second luminous power is combined with filter factor, the Optical Signal To Noise Ratio determined and treat light signal can be calculated easily, achieve and transmitter is not being modified, optical signal-to-noise ratio monitoring to received optical signal when not affecting transfer of data.
Wherein, above-mentioned bandpass filtering is to the determination of the filter factor of light signal and the filter factor of noise, can be at the filter factor based on this light signal, any time before the filter factor determination Optical Signal To Noise Ratio of noise carries out, as long as the filter factor of bandpass filtering to light signal and the filter factor of noise can be known when determining Optical Signal To Noise Ratio in above-mentioned steps S103, such as carried out before monitoring Optical Signal To Noise Ratio, or carry out treating before light signal carries out bandpass filtering, or after treating light signal and carrying out bandpass filtering, carry out etc. before determining Optical Signal To Noise Ratio, to determining that the moment of bandpass filtering to the filter factor of light signal and the filter factor of noise is not specifically limited in the present invention program.Specifically determine the mode of bandpass filtering to the filter factor of light signal and the filter factor of noise, the any one mode in existing mode can be adopted to carry out, such as by known signal is passed through band pass filter in muting situation, thus calculate the filter factor of filter to light signal.By by known noise when no signal by band pass filter, thus calculate the filter factor of filter to noise, will not repeat in detail at this.
In addition, when specifically determining Optical Signal To Noise Ratio, when filter factor to the filter factor of light signal, noise of the second luminous power after learning unfiltered first luminous power, bandpass filtering and bandpass filtering, those skilled in the art easily know specifically how to calculate and determine concrete Optical Signal To Noise Ratio.For making the mode determining Optical Signal To Noise Ratio more apparent, for light splitting rate for 1:1, following formulae discovery Optical Signal To Noise Ratio can be adopted:
In formula, OSNR(dB) represent Optical Signal To Noise Ratio, α represents the filter factor of above-mentioned bandpass filtering to light signal, and β represents the filter factor of above-mentioned bandpass filtering to noise, P
1represent above-mentioned first luminous power, P
2represent above-mentioned second luminous power, B
nrepresent noise bandwidth, B
rrepresent resolution bandwidth.Noise bandwidth Bn, resolution bandwidth Br can adopt existing and any mode that is that later may occur measurement to obtain, and repeat no longer in detail at this.In above-mentioned example, for light splitting rate for 1:1 is described, when light splitting rate is other ratios, determination mode when being 1:1 based on above-mentioned light splitting rate, can be, after the first luminous power is converted into luminous power corresponding when light splitting rate is 1:1, re-uses above-mentioned formula and calculate.Also can be directly determine based on the computing formula that this light splitting rate ratio is corresponding, for a person skilled in the art, when computing formula when known above-mentioned light splitting rate is 1:1, be easy to know and specifically how to convert, therefore will not repeat in detail at this.
According to the OSNR Monitoring Method of the invention described above, the present invention also provides a kind of optical signal-to-noise ratio monitoring device.The structural representation of optical signal-to-noise ratio monitoring device embodiment one of the present invention has been shown in Fig. 2.
As shown in Figure 2, optical signal-to-noise ratio monitoring device in the present embodiment one, include the fiber coupler that light signal is treated in access, the first light power meter, the band pass filter that are connected with the output of described fiber coupler respectively, and the second light power meter be connected with described band pass filter.
During work, what received treats that light signal enters fiber coupler and is coupled, light signal after fiber coupler coupling, one tunnel enters the first light power meter, the first luminous power of this road light signal is measured by the first light power meter, another road enters band pass filter, carries out entering the second light power meter after bandpass filtering, measured the second luminous power of the light signal after this road bandpass filtering by the second light power meter through band pass filter.The first luminous power measured based on above-mentioned, the second luminous power and the filter factor of band pass filter to light signal, the filter factor of noise, can calculate and determine the above-mentioned Optical Signal To Noise Ratio treating light signal.Thus achieve when not modifying on transmitter, optical signal-to-noise ratio monitoring to received optical signal when not affecting transfer of data.
Wherein, above-mentioned based on filter factor determination Optical Signal To Noise Ratio to the filter factor of light signal and noise of the first luminous power, the second luminous power, band pass filter time, owing to having measured the first luminous power, the second luminous power, and be realised that the filter factor of band pass filter to light signal and the filter factor of noise, thus can be calculated by mode manually.On the other hand, specific processor also can be set to perform this calculating deterministic process, to realize automation computing.
Accordingly, the structural representation of optical signal-to-noise ratio monitoring device embodiment two of the present invention has been shown in Fig. 3.As shown in Figure 3, be relative to the difference of embodiment one, optical signal-to-noise ratio monitoring device in the present embodiment two, also comprise processor further, this processor is connected with above-mentioned first light power meter, the second light power meter, determines the Optical Signal To Noise Ratio treating light signal by this processor according to above-mentioned first light power meter, the second light power meter, the filter factor calculating of band pass filter to the filter factor of light signal and noise.
Wherein, above-mentioned band pass filter is to the determination of the filter factor of light signal and the filter factor of noise, can be based on this band pass filter, any time before the filter factor determination Optical Signal To Noise Ratio of the filter factor of light signal and noise is being carried out, as long as the filter factor of band pass filter to light signal and the filter factor of noise can be known when above-mentioned artificial or processor determination Optical Signal To Noise Ratio, such as, carry out before monitoring Optical Signal To Noise Ratio, or carry out treating before light signal carries out bandpass filtering, or after treating light signal and carrying out bandpass filtering, carry out etc. before determining Optical Signal To Noise Ratio, to determining that the moment of band pass filter to the filter factor of light signal and the filter factor of noise does not limit in the present invention program.Concrete determination band pass filter, to the mode of the filter factor of light signal and the filter factor of noise, can adopt any one mode in existing mode to carry out, such as
By known signal is passed through band pass filter in muting situation, thus calculate the filter factor of filter to light signal.By by known noise when no signal by band pass filter, thus calculate the filter factor of filter to noise, will not repeat in detail at this.
In addition, above-mentioned fiber coupler, can adopt light splitting rate to be the fiber coupler of any value, when light splitting rate is different value, determine that the mode of Optical Signal To Noise Ratio is relevant with this light splitting rate.Be 1:1 for the light splitting rate of fiber coupler, processor can adopt the above-mentioned Optical Signal To Noise Ratio of following formulae discovery:
In formula, OSNR(dB) represent above-mentioned Optical Signal To Noise Ratio, α represents the filter factor of band pass filter to light signal, and β represents the filter factor of band pass filter to noise, P
1represent above-mentioned first luminous power, P
2represent above-mentioned second luminous power, B
nrepresent noise bandwidth, B
rrepresent resolution bandwidth.Noise bandwidth Bn, resolution bandwidth Br can adopt existing and any mode that is that later may occur measurement to obtain, and repeat no longer in detail at this.
In above-mentioned example, for light splitting rate for 1:1 is described, when light splitting rate is other ratios, determination mode when being 1:1 based on above-mentioned light splitting rate, can be, after the first luminous power is converted into luminous power corresponding when light splitting rate is 1:1, re-uses above-mentioned formula and calculate.Also can be directly determine based on the computing formula that this light splitting rate ratio is corresponding, for a person skilled in the art, be easy to know and specifically how to convert, therefore will not repeat in detail at this.
Based on the optical signal-to-noise ratio monitoring device of the invention described above, be described in detail below in conjunction with a concrete test case.
Known wavelength and bandwidth treat that light signal is coupled into the entrance of fiber coupler, and be divided into two-way by fiber coupler.That tested treats that light signal is the DQPSK signal of 42.8Gb/s, and with the optical noise of 1.3nm bandwidth.The output of fiber coupler connects the first light power meter and band pass filter respectively.This band pass filter can centered by wavelength and the adjustable band pass filter of bandwidth, specifically can need to regulate according to the centre wavelength of institute's test signal and bandwidth, thus can easily in wavelength division multiplexing (WDM) system, to test the Optical Signal To Noise Ratio of different channels by changing centre wavelength.This band pass filter also can use the narrow band filter of fixed-bandwidth.Centered by this band pass filter when wavelength and the adjustable band pass filter of bandwidth, the centre wavelength of band pass filter can be adjusted to the wavelength treating light signal, by the bandwidth selection of band pass filter than the value of narrow bandwidth treating light signal.
In this example, the bandwidth of band pass filter is 0.32nm, and the filter factor (α) of this band pass filter to institute's test light signal is 0.379, and is 0.121 to the filter factor (β) of noise.The output of band pass filter is connected to the second light power meter.The optical signal power of what the second light power meter measured have passed through narrow-band filtering is P2.Because fiber coupler carries out decile output to light signal, thus this Optical Signal To Noise Ratio (OSNR) can be calculated by following formula.
In above-mentioned equation, Bn is the bandwidth of noise, and Br is resolution bandwidth.Noise bandwidth Bn, resolution bandwidth Br can adopt existing and any mode that is that later may occur measurement to obtain, and repeat no longer in detail at this.
The result of the experiment that optical signal-to-noise ratio monitoring device of the present invention is monitored 42.8-Gb/s DQPSK signal under non-dispersive and polarization mode dispersion situation and software emulation has been shown in Fig. 4.The platform that software emulation uses is VPItransmssionMaker7.6.In an experiment, we have taken a sample test the performance of optical signal-to-noise ratio monitoring in two different polarization state situations at random.In shown in Fig. 4, abscissa represents the Optical Signal To Noise Ratio (OSNR) recorded by spectrometer (OSA), ordinate represents the OSNR calculated according to the present invention program, under SOP1, SOP2 represent two kinds of polarization states respectively, the OSNR experimental result recorded, Simulation represents the OSNR theoretical curve obtained according to Software simulation calculation.SOP1 and SOP2 is OSNR result in the two kinds of polarization state situations taken a sample test at random in an experiment, and itself and notional result are substantially identical, therefore this method with treat light signal polarization state have nothing to do.The Optical Signal To Noise Ratio scope of monitoring demonstrated in Figure 4 is 15dB to 35dB, and those skilled in the art can know, and the monitoring range of the optical signal-to-noise ratio monitoring device that the present invention program provides is not limited to this scope.Can find from result shown in Fig. 4, when the high Optical Signal To Noise Ratio of monitoring, monitor and feedback is larger than error during the low Optical Signal To Noise Ratio of monitoring.This be due to the bandpass filtering when high s/n ratio after the second luminous power (P2) less with the change of Optical Signal To Noise Ratio.When using the band pass filter compared with narrow bandwidth, this error is larger.Therefore, when Optical Signal To Noise Ratio is higher, the error of the second luminous power P2 can cause larger monitor and feedback.But the error measured can be reduced by the result on average repeatedly measured, namely above-mentioned second luminous power P2 can be the mean value that the second light power meter carries out that N time is measured N the power obtained, wherein N is positive integer, and the concrete times N measured can be set by actual needs.The more important thing is that the monitoring of Optical Signal To Noise Ratio can not be subject to the impact of polarization state change, therefore the present invention is a kind of polarization-independent OSNR Monitoring Method.
Based on similar consideration, above-mentioned first luminous power P1 can be the performance number that the first light power meter carries out one-shot measurement and obtains, and also can be to carry out the mean value that M time is measured M the power obtained, to avoid the impact of measure error.Wherein, M is positive integer.The value of M and N can be identical, also can not be identical.
Fig. 5 shows signal to be monitored impact on optical signal-to-noise ratio monitoring accuracy under different dispersion values.In shown in Fig. 5, abscissa represents dispersion (CD, Chromatic Dispersion) value, and ordinate represents the OSNR calculated according to the present invention program.As seen from Figure 5, when dispersion is increased to the process of-600ps/nm from 0ps/nm, in the monitoring range of 15dB to 30dB Optical Signal To Noise Ratio, the error of monitoring is within 0.7dB.Therefore can determine that the inventive method is the impact that can not be subject to dispersion.Fig. 6 shows the impact of signal to be monitored on optical signal-to-noise ratio monitoring accuracy under the impact of polarization mode dispersion in various degree.In shown in Fig. 6, abscissa represents Differential Group Delay, and ordinate represents the OSNR calculated according to the present invention program.As seen from Figure 6, based on method of the present invention, when group delay (Differential Group Delay, DGD) difference rises to the process of 60ps from 0ps, the monitoring of Optical Signal To Noise Ratio still can not be subject to obvious impact.
In addition, when the degree of polarization (DOP) of noise changes time, the monitoring of Optical Signal To Noise Ratio can not be affected equally.Under the degree of polarization that Fig. 7 illustrates the noise of partial polarization is respectively 0.1 and 0.3 two kind of situation, the experimental result of optical signal-to-noise ratio monitoring and simulation result, in shown in Fig. 7, abscissa represents Optical Signal To Noise Ratio, ordinate represents the OSNR calculated according to the present invention program, Simulation represents the OSNR theoretical curve obtained based on Software simulation calculation, and it coincide with the result of the signal of different polarization degree noise contained by two kinds measured by experiment.Visible by Fig. 7, error is between the two very little.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. an OSNR Monitoring Method, is characterized in that, comprises step:
Measure the first luminous power treating light signal;
Carry out after bandpass filtering to described until light signal, the second luminous power treating light signal after measuring tape pass filter;
The Optical Signal To Noise Ratio of light signal is treated described according to described first luminous power, the second luminous power and bandpass filtering the filter factor of light signal and the filter factor of noise being determined.
2. OSNR Monitoring Method according to claim 1, is characterized in that, described second luminous power is to carrying out the performance number that one-shot measurement obtains or the average of carrying out N number of power that N measurement obtains after described optical signal band pass filter to be measured.
3. OSNR Monitoring Method according to claim 1 and 2, is characterized in that, when light splitting rate is 1:1, adopts Optical Signal To Noise Ratio described in following formulae discovery:
In formula, OSNR(dB) represent described Optical Signal To Noise Ratio, α represents the filter factor of described bandpass filtering light signal, and β represents the filter factor of described bandpass filtering to noise, P
1represent described first luminous power, P
2represent described second luminous power, B
nrepresent noise bandwidth, B
rrepresent resolution bandwidth.
4. an optical signal-to-noise ratio monitoring device, it is characterized in that, comprise the fiber coupler that light signal is treated in access, the first light power meter, the band pass filter that are connected with the output of described fiber coupler respectively, and the second light power meter be connected with described band pass filter.
5. optical signal-to-noise ratio monitoring device according to claim 4, it is characterized in that, also comprise the processor be connected with described first light power meter, described second light power meter, described in calculating for the filter factor of the filter factor to light signal according to described first luminous power, the second luminous power and described band pass filter, noise, treat the Optical Signal To Noise Ratio of light signal.
6. optical signal-to-noise ratio monitoring device according to claim 4, it is characterized in that, described first luminous power is to described, described first light power meter treats that light signal carries out the performance number that one-shot measurement obtains or the average of carrying out M the power that M measurement obtains, and M is positive integer.
7. optical signal-to-noise ratio monitoring device according to claim 5, it is characterized in that, described second luminous power is described second light power meter to treating that light signal carries out performance number that one-shot measurement obtains or carries out the average that N time is measured the N number of power obtained after bandpass filtering, and N is positive integer.
8. the optical signal-to-noise ratio monitoring device according to claim 5 to 7 any one, is characterized in that, when the light splitting rate of described fiber coupler is 1:1, described processor adopts Optical Signal To Noise Ratio described in following formulae discovery:
In formula, OSNR(dB) represent described Optical Signal To Noise Ratio, α represents the light filter factor of described band pass filter, and β represents the noise filtering coefficient of described band pass filter, P
1represent described first luminous power, P
2represent described second luminous power, B
nrepresent noise bandwidth, B
rrepresent resolution bandwidth.
9. the optical signal-to-noise ratio monitoring device according to claim 4 to 7 any one, it is characterized in that, described band pass filter is adjustable bandwidth filter, treat that the bandwidth of light signal is little described in its selected bandwidth ratio, its operating central wavelength is identical with measured signal centre wavelength or within the scope of predetermined deviation.
10. the optical signal-to-noise ratio monitoring device according to claim 4 to 7 any one, it is characterized in that, described band pass filter is bandwidth fixed filters, treat described in the bandwidth ratio of described band pass filter that the bandwidth of light signal is little, its operating central wavelength is identical with measured signal centre wavelength or within the scope of predetermined deviation.
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Application publication date: 20150902 |
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