CN103001695A - Device and method for monitoring optical network performances - Google Patents
Device and method for monitoring optical network performances Download PDFInfo
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- CN103001695A CN103001695A CN2012105803642A CN201210580364A CN103001695A CN 103001695 A CN103001695 A CN 103001695A CN 2012105803642 A CN2012105803642 A CN 2012105803642A CN 201210580364 A CN201210580364 A CN 201210580364A CN 103001695 A CN103001695 A CN 103001695A
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Abstract
A device for monitoring optical network performances comprises a coupler (1), a filter (2), a first light intensity detection element (3), a second light intensity detection element (4), a first spectrum analyzer (5), a second spectrum analyzer (6) and a division operation unit (7). According to the device and a method for monitoring optical network performances, in a high-speed dynamic reconfigurable optical add and drop multiplexer, a radio frequency (RF) spectrum technology is used for achieving a chromatic dispersion (CD) monitoring technology of insensitive polarization mode dispersion (PMD), and CD and PMD can be monitored independently and simultaneously. The method is simple to implement, the device structure is simple, the detection bandwidth is low, a transmitter is not needed to be modified, the monitoring sensitivity is improved apparently, and the monitoring range is increased.
Description
Technical field
The present invention relates to the optical communication technique field, particularly a kind of optical-fiber network performance monitoring device and monitoring method.
Background technology
In optical communication network, in order to guarantee good service quality, the importance of optical-fiber network performance monitoring becomes more and more outstanding.The radio-frequency spectrum analytical technology is a kind of performance monitoring technology commonly used.The damage that is caused by spontaneous emission noise (ASE, Amplified Spontaneous Emission), optical fiber dispersion etc. can change intensity and the phase place of signal, through behind the strength investigation, can present certain feature in the signal RF spectrum.The radio-frequency spectrum analytical technology, namely extract these features with the monitoring technology of monitoring damage Optical Signal To Noise Ratio by modes such as filtering, be key technology wherein, the characteristics such as that this technology has is insensitive to signal polarization, effect stability are suitable for the damage monitoring of phase modulated signal.
Beat frequency occurs in signal and noise when receiver is detected, produce to clap noise, is the chief component of low frequency place radio frequency (RF, Radio Frequency) component, and is relevant with the signal to noise ratio of signal.By extracting the RF power of clapping noise, get final product the Optical Signal To Noise Ratio (OSNR, Optical Signal Noise Ratio) of monitor signal.
Polarization mode dispersion (PMD, Polarization Mode Dispersion) also is one of important parameter of restriction transmission performance in high speed wavelength division multiplexing system (WDM, the Wave Division Multiplexing) system.PMD accumulates in optical fiber link and many online devices, and in time, the reconstruct of temperature, network and changing, thereby real-time PMD monitoring is very necessary.Eye pattern and time-delay tap diagram technology can reflect the size of PMD, yet when other damage existed, it was still challenging to measure PMD.
To cause the important parameter of signal impairment be chromatic dispersion (CD, Chroma Dispersion) to another one in the transmission link.Utilize the technology of RF spectrum monitoring CD to have at present a lot of reports.In the monitoring technology of these reports, because RF weight of pilot frequency technology does not need high speed device, although can be used in on-line monitoring, need to revise transmitter, the weight of pilot frequency of increase also can affect the performance of data-signal transmission.Detect the clock-pulse component technology for monitoring high speed signal and improper.
Multiple impairment parameter is realized that simultaneously independently monitoring can reduce cost.Utilize at present document that the RF spectral technology monitors CD and PMD simultaneously also seldom.Document [1] has been reported with interferometer and has been monitored simultaneously CD and PMD, but this method less stable.Therefore, exploring can be significant for the performance guarantee of following optical-fiber network for the monitoring technology of the multiple impairment parameter of monitoring high speed complex modulation format signal.
The list of references source:
[1]Y.Lizé,L.Christen,et?al.,“Independent?and?simultaneousmonitoring?of?chromatic?and?polarization?mode?dispersion?in?OOK?andDPSK?transmission,”IEEE?Photon.Technol.Lett.,vol.19,2007,pp.3–5.
Summary of the invention
The invention provides a kind of optical-fiber network performance monitoring device and monitoring method, be used for solving prior art and use RF spectrum (RF, Radio Frequency) technology is monitored chromatic dispersion (CD simultaneously, Chroma Dispersion) and polarization mode dispersion (PMD, Polarization Mode Dispersion) time, the weight of pilot frequency that need to revise transmitter, increase can affect the data-signal transmission performance, detect the problem of poor stability.
A kind of optical-fiber network performance monitoring device provided by the invention comprises: coupler 1, filter 2, the first luminous intensity detecting element 3, the second luminous intensity detecting element 4, the first spectrum analyzer 5, the second spectrum analyzer 6, division arithmetic unit 7, wherein:
The first luminous intensity detecting element 3 and the second luminous intensity detecting element 4, luminous intensity for detection of measured signal, the output port of described the first luminous intensity detecting element 3 connects described the first spectrum analyzer 5 input ports, and the output port of described the second luminous intensity detecting element 4 connects the input port of described the second spectrum analyzer 6;
The first spectrum analyzer 5 and the second spectrum analyzer 6, RF power for detection of measured signal, the output port of described the first spectrum analyzer 5 output ports and described the second spectrum analyzer 6 jointly accesses division arithmetic unit 7 and carries out the division processing, by division arithmetic unit 7 output detections results.
Further, optical-fiber network performance monitoring device of the present invention, the splitting ratio of described coupler 1 is 1:1.
Further, optical-fiber network performance monitoring device of the present invention, described filter 2 is Gauss's second-order bandpass filters.
Further, optical-fiber network performance monitoring device of the present invention, the bandwidth of described filter 2 is 10GHz.
Further, optical-fiber network performance monitoring device of the present invention, described the first spectrum analyzer 5 and the second spectrum analyzer 6 are RF power detection analyzers.
Further, the monitoring method of optical-fiber network performance monitoring device of the present invention comprises:
Step S101, measured signal is inputted described optical-fiber network performance monitoring device, utilize coupler 1 that measured signal is divided into two-way, then the measured signal of the first output port output of coupler 1 enters step S102 by one of them band components of filter 2 its double-sideband signals of filtering; The measured signal of the second output port output of coupler 1 directly enters step S102;
Step S102 carries out respectively luminous intensity to two paths of signals and detects;
Step S103 carries out respectively the RF power detection to two paths of signals, and the RF power of the second spectrum analyzer 6 outputs is designated as P1, and the RF power of the first spectrum analyzer 5 outputs is designated as P2.
Step S104 utilizes formula R=P
2/ P
1, try to achieve the double-side band of measured signal and the power ratio R of single-side belt, weigh the optical-fiber network performance of measured signal by power ratio R.
Further, monitoring method of the present invention before measured signal being inputted described optical-fiber network performance monitoring device, also comprises and processing early stage:
Step S201, input direct-current light enters the modulating device of measured signal, regulates the polarization state of described modulating device, and when transmission ends power reaches maximum, and reflection end power is when reaching minimum value, the polarization state of fixing described modulating device;
Step S202 keeps the polarization state of described modulating device, detection signal input CD dispersion generation device, is used for simulating the CD dispersion;
Step S203 keeps the polarization state of described modulating device, and the detection signal input PMD generation device through described CD dispersion generation device is used for producing the PMD dispersion;
Step S204 inputs described optical-fiber network performance monitoring device to the detection signal through described PMD generation device.
By a kind of optical-fiber network performance monitoring device of the present invention and monitoring method, at at a high speed dynamic Reconfigurable Optical Add/drop Multiplexer (ROADM, Reconfigurable Optical Add-Drop Multiplexer) in, utilize RF spectrum (RF, Radio Frequency) technology has realized polarization mode dispersion (PMD, Polarization Mode Dispersion) insensitive chromatic dispersion (CD, Chroma Dispersion) monitoring technology, and can monitor independently chromatic dispersion CD and polarization mode dispersion PMD simultaneously, its method realizes simple, apparatus structure is simple, detective bandwidth is low, do not need to revise transmitter, and obviously improved monitoring sensitivity, increased monitoring range.
Description of drawings
Fig. 1 is a kind of optical-fiber network performance monitoring device structural representation of the embodiment of the invention;
Fig. 2 is the process chart in early stage of monitoring method of the optical-fiber network performance monitoring device of the embodiment of the invention;
Fig. 3 is the monitoring method flow chart of the optical-fiber network performance monitoring device of the embodiment of the invention;
Fig. 4 is the insensitive PMD surveillance map of CD of the optical-fiber network performance monitoring device of the embodiment of the invention;
The surveillance map of monitoring CD and PMD when Fig. 5 is the rear single order PMD Differential Group Delay DGD of optical-fiber network performance monitoring device of the embodiment of the invention;
Fig. 6 is that the optical-fiber network performance monitoring device of the embodiment of the invention carries out DGD after RF power is divided by to monitoring CD influential effect figure.
Embodiment
In order to understand better the present invention, the invention will be further described below in conjunction with accompanying drawing and embodiment.
Fig. 1 is a kind of optical-fiber network performance monitoring device structural representation of the embodiment of the invention, as shown in Figure 1, a kind of optical-fiber network performance monitoring device that the embodiment of the invention provides, comprise: coupler 1, filter 2, the first luminous intensity detecting element 3, the second luminous intensity detecting element 4, the first spectrum analyzer 5, the second spectrum analyzer 6, division arithmetic unit 7, wherein:
The first luminous intensity detecting element 3 and the second luminous intensity detecting element 4, luminous intensity for detection of measured signal, the output port of described the first luminous intensity detecting element 3 connects described the first spectrum analyzer 5 input ports, and the output port of described the second luminous intensity detecting element 4 connects the input port of described the second spectrum analyzer 6;
The first spectrum analyzer 5 and the second spectrum analyzer 6, it is RF power detection analyzer, RF(Radio Frequency for detection of measured signal) power, the output port of described the first spectrum analyzer 5 output ports and described the second spectrum analyzer 6 jointly accesses division arithmetic unit 7 and carries out the division processing, by division arithmetic unit 7 output detections results.
Fig. 2 is the process chart in early stage of monitoring method of the optical-fiber network performance monitoring device of the embodiment of the invention, as shown in Figure 2, the described monitoring method of the embodiment of the invention, before measured signal being inputted described optical-fiber network performance monitoring device, also comprise and processing early stage, make the power invariability of measured signal, specifically comprise:
Step S201, input direct-current light enters the modulating device of measured signal, regulates the polarization state of described modulating device, and when transmission ends power reaches maximum, and reflection end power is when reaching minimum value, the polarization state of fixing described modulating device;
Step S202 keeps the polarization state of described modulating device, detection signal input CD(Chroma Dispersion) the dispersion generation device, be used for simulating the CD dispersion;
Step S203 keeps the polarization state of described modulating device, the detection signal input PMD(Polarization Mode Dispersion through described CD dispersion generation device) generation device, be used for producing the PMD dispersion;
Step S204 inputs described optical-fiber network performance monitoring device to the detection signal through described PMD generation device, at this moment the power invariability of measured signal.
Fig. 3 is the monitoring method flow chart of the optical-fiber network performance monitoring device of the embodiment of the invention, and as shown in Figure 3, the monitoring method of optical-fiber network performance monitoring device of the present invention comprises:
Step S101, the measured signal of power invariability is inputted described optical-fiber network performance monitoring device, utilize coupler 1 that measured signal is divided into two-way, then the measured signal of the first output port output of coupler 1 enters step S102 by one of them band components of filter 2 its double-sideband signals of filtering; The measured signal of the second output port output of coupler 1 directly enters step S102;
Step S102 carries out respectively luminous intensity to two paths of signals and detects;
Step S103 carries out respectively the RF power detection to two paths of signals, and the RF power of the second spectrum analyzer 6 outputs is designated as P
1, the RF power of the first spectrum analyzer 5 outputs is designated as P
2
Step S104 utilizes formula R=P
2/ P
1Try to achieve the double-side band of measured signal and the power ratio R of single-side belt, the optical-fiber network performance by power ratio R weighs measured signal is used for monitoring polarization mode dispersion (PMD, Polarization Mode Dispersion) insensitive chromatic dispersion (CD, Chroma Dispersion).
Because P2 and P1 received power can be subject to the impact of PMD in each experimentation, so being equivalent to twice received power, power ratio R is divided by, to eliminate the impact of PMD, although R is a relative ratio, but the insensitive CD dispersion of PMD is being described, be absolute on the overall trend, can carry out quantitative analysis, be used for the CD dispersion that the system of PMD impact is eliminated in monitoring herein.
The principle of the embodiment of the invention is as follows:
Monitoring technology scheme of the present invention can be monitored CD and PMD simultaneously independently, realizes that simply detective bandwidth is low, does not need to revise transmitter.Prior art can't be monitored CD and PMD simultaneously, and Differential Group Delay (DGD, Differential Group Delay) is exactly single order PMD, here be method more strictly speaking with DGD, in the optical-fiber network performance monitoring technology, monitoring PMD often just monitors its single order PMD dispersion, namely DGD.
At first the measured signal by filter 2 is detected, can realize the insensitive polarization mode dispersion PMD monitoring of chromatic dispersion CD, namely polarization mode dispersion PMD is monitored separately, Fig. 4 is the insensitive PMD surveillance map of CD of the optical-fiber network performance monitoring device of the embodiment of the invention, as shown in Figure 4, when the CD value is 178ps/nm, when 356ps/nm and 534ps/nm, port one is for the single order PMD of 0 ~ 50ps, the monitoring effect that is DGD does not change, illustrate that CD on the not impact of monitoring DGD effect, realizes the insensitive PMD monitoring of CD.Adopt and directly detect to measured signal, can monitor chromatic dispersion CD, and responsive to polarization mode dispersion PMD, namely realize chromatic dispersion CD and polarization mode dispersion PMD are monitored simultaneously, the surveillance map of monitoring CD and PMD when Fig. 5 is the rear single order PMD Differential Group Delay DGD of optical-fiber network performance monitoring device of the embodiment of the invention, as shown in Figure 5, for directly signal being carried out strength investigation, when being used for monitoring CD, reaction DGD is on the impact of CD monitoring.Can find, can realize that monitoring CD reaches 320ps/nm, and be responsive to DGD.Under a certain CD value, the DGD value is larger, and the general power of radio frequency is less, and the variation of the general power of radio frequency is larger.In monitoring CD process, the RF power when DGD equals 15ps is compared DGD and is equaled at 0 o'clock, and power changes less than 1dB.DGD is during greater than 15ps, and the general power of radio frequency changes and increases;
When then relatively two road measured signals adopted different radio frequency (RF, Radio Frequency) monitoring frequency respectively, the variation of monitoring range and out-put dynamic range namely utilized the power P of the radio frequency of two road measured signals
1And P
2Be divided by, utilize formula R=P
2/ P
1, try to achieve the power ratio R of radio frequency;
Monitor at last the effect of chromatic dispersion CD with power ratio R, Fig. 6 is that the optical-fiber network performance monitoring device of the embodiment of the invention carries out DGD after RF power is divided by to monitoring CD influential effect figure, as shown in Figure 6, for carrying out after RF power is divided by, DGD is on the impact of monitoring CD effect.Can see that as DGD during in 0 ~ 45ps scope, the ratio curve of power overlaps, and has illustrated that well this monitoring scheme is insensitive to DGD in monitoring CD process, with accord with theoretical analysis.
The present invention is on the insensitive polarization mode dispersion PMD of chromatic dispersion CD monitoring technology basis, proposed to utilize the ratio of radio-frequency power, can eliminate polarization mode dispersion PMD to the impact of radio frequency power, realize insensitive chromatic dispersion CD monitoring to polarization mode dispersion PMD.Utilize optical-fiber network performance monitoring device of the present invention and monitoring method, can monitor independently chromatic dispersion CD and polarization mode dispersion PMD simultaneously, that technology realizes is simple, detective bandwidth is low, do not need to revise transmitter, and has obviously improved monitoring sensitivity, increased monitoring range.
The implementation result of the embodiment of the invention is as follows:
Setting measured signal is the NRZ-DQPSK signal of 80Gb/s, when the frequency of radio frequency is 10GHz, this technology can realize the chromatic dispersion CD monitoring to 0 ~ 246.7ps/nm scope, out-put dynamic range is 0 ~ 22.3dB, (DGD, Differential GroupDelay) is insensitive to Differential Group Delay; One arm of monitoring modular also can be realized the monitoring to the Differential Group Delay DGD in 0 ~ 50ps scope, and out-put dynamic range is 0 ~ 42.7dB, keeps simultaneously insensitive to chromatic dispersion CD.For the insensitive chromatic dispersion CD of monitoring Differential Group Delay DGD, the position of monitoring RF frequency can be low to moderate 5GHz, and monitoring range can be up to 356ps/nm, and out-put dynamic range is 0 ~ 30.5dB.
Below only be the preferred embodiments of the present invention; certainly; the present invention can also have other various embodiments; in the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (7)
1. optical-fiber network performance monitoring device, it is characterized in that, comprise: coupler (1), filter (2), the first luminous intensity detecting element (3), the second luminous intensity detecting element (4), the first spectrum analyzer (5), the second spectrum analyzer (6), division arithmetic unit (7), wherein:
Coupler (1), be used for measured signal is divided into two-way, measured signal is inputed to the input port of described coupler (1), the first output port of described coupler (1) connects the input port of described filter (2), and the second output port of coupler (1) connects the input port of described the first luminous intensity detecting element (3);
Filter (2), for the band components of filtering measured signal, the output port of described filter (2) connects the input port of described the second luminous intensity detecting element (4);
The first luminous intensity detecting element (3) and the second luminous intensity detecting element (4), luminous intensity for detection of measured signal, the output port of described the first luminous intensity detecting element (3) connects described the first spectrum analyzer (5) input port, and the output port of described the second luminous intensity detecting element (4) connects the input port of described the second spectrum analyzer (6);
The first spectrum analyzer (5) and the second spectrum analyzer (6), RF power for detection of measured signal, the output port of described the first spectrum analyzer (5) output port and described the second spectrum analyzer (6) jointly accesses division arithmetic unit (7) and carries out the division processing, by division arithmetic unit (7) output detections result.
2. optical-fiber network performance monitoring device according to claim 1 is characterized in that, the splitting ratio of described coupler (1) is 1:1.
3. optical-fiber network performance monitoring device according to claim 1 is characterized in that, described filter (2) is Gauss's second-order bandpass filter.
4. optical-fiber network performance monitoring device according to claim 3 is characterized in that, the bandwidth of described filter (2) is 10GHz.
5. optical-fiber network performance monitoring device according to claim 1 is characterized in that, described the first spectrum analyzer (5) and the second spectrum analyzer (6) are RF power detection analyzers.
6. the monitoring method of each described optical-fiber network performance monitoring device in 5 according to claim 1 is characterized in that, comprising:
Step S101, measured signal is inputted described optical-fiber network performance monitoring device, utilize coupler (1) that measured signal is divided into two-way, the measured signal of the first output port output of coupler (1) then enters step S102 by one of them band components of filter (2) its double-sideband signal of filtering; The measured signal of the second output port output of coupler (1) directly enters step S102;
Step S102 carries out respectively luminous intensity to two paths of signals and detects;
Step S103 carries out respectively the RF power detection to two paths of signals, and the RF power of the second spectrum analyzer (6) output is designated as P
1, the RF power of the first spectrum analyzer (5) output is designated as P
2
Step S104 utilizes formula R=P
2/ P
1, try to achieve the double-side band of measured signal and the power ratio R of single-side belt, weigh the optical-fiber network performance of measured signal by power ratio R.
7. monitoring method according to claim 6 is characterized in that, before measured signal being inputted described optical-fiber network performance monitoring device, also comprises and processing early stage:
Step S201, input direct-current light enters the modulating device of measured signal, regulates the polarization state of described modulating device, and when transmission ends power reaches maximum, and reflection end power is when reaching minimum value, the polarization state of fixing described modulating device;
Step S202 keeps the polarization state of described modulating device, detection signal input CD dispersion generation device, is used for simulating the CD dispersion;
Step S203 keeps the polarization state of described modulating device, and the detection signal input PMD generation device through described CD dispersion generation device is used for producing the PMD dispersion;
Step S204 inputs described optical-fiber network performance monitoring device to the detection signal through described PMD generation device.
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| CN103281119A (en) * | 2013-06-17 | 2013-09-04 | 苏州优康网络电子商务有限公司 | Performance monitoring device applicable to optical network |
| CN105141477A (en) * | 2015-08-20 | 2015-12-09 | 中国人民解放军西安通信学院 | Optical network information security monitoring system based on optical fiber sensing and monitoring method |
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| CN103281119A (en) * | 2013-06-17 | 2013-09-04 | 苏州优康网络电子商务有限公司 | Performance monitoring device applicable to optical network |
| CN105141477A (en) * | 2015-08-20 | 2015-12-09 | 中国人民解放军西安通信学院 | Optical network information security monitoring system based on optical fiber sensing and monitoring method |
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| CN110383725A (en) * | 2017-03-15 | 2019-10-25 | 华为技术有限公司 | System and method without dark section transmission network are provided |
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| CN107204803A (en) * | 2017-05-16 | 2017-09-26 | 华中科技大学 | A kind of polarization mode dispersion monitoring method and system based on PPM Transmission systems |
| CN108449135A (en) * | 2018-05-11 | 2018-08-24 | 华中科技大学 | A kind of optical signal-to-noise ratio monitoring device and monitoring method based on the space interference of light |
| CN108449135B (en) * | 2018-05-11 | 2019-10-08 | 华中科技大学 | A kind of optical signal-to-noise ratio monitoring device and monitoring method based on the space interference of light |
| CN113206703A (en) * | 2021-04-19 | 2021-08-03 | 烽火通信科技股份有限公司 | Wavelength division multiplexing chromatic dispersion and polarization mode dispersion monitoring method and device |
| CN113472448A (en) * | 2021-07-16 | 2021-10-01 | 华中科技大学 | Chromatic dispersion monitoring method based on coherent optical communication system |
| CN113472448B (en) * | 2021-07-16 | 2022-05-06 | 华中科技大学 | Chromatic dispersion monitoring method based on coherent optical communication system |
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