CN102088314B - Optical signal to noise ratio (OSNR) monitoring device and monitoring method - Google Patents
Optical signal to noise ratio (OSNR) monitoring device and monitoring method Download PDFInfo
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- CN102088314B CN102088314B CN201110025979.4A CN201110025979A CN102088314B CN 102088314 B CN102088314 B CN 102088314B CN 201110025979 A CN201110025979 A CN 201110025979A CN 102088314 B CN102088314 B CN 102088314B
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Abstract
The invention discloses an optical signal to noise ratio (OSNR) monitoring device and monitoring method, comprising an optical amplifier (1), a first polarization control element (2), a circulator (3), a coupler (4), a nonlinear optical element (5), an attenuator (6), a second polarization control element (7), a first power meter (8) and a second power meter (9). The invention further discloses an OSNR monitoring method using the device, comprising the following steps: optimizing the polarization control elements to obtain working conditions of the linear area of the device; describing the power transmittance ratio of a transmission end to a reflection end of the monitoring device; fitting the relation between an OSNR and an output power by using a least square method; and back-calculating the OSNR by the output power according to the relation. The device and method disclosed by the invention are suitable for high-speed optical communication system. The device and method are compared with the prior scheme, the flexibility and monitoring range are improved obviously.
Description
Technical field
The present invention relates to optical communication technique field, particularly a kind of optical signal-to-noise ratio monitoring device and monitoring method.
Background technology
In optical communication network, in order to guarantee good service quality, the importance of optical property monitoring becomes more and more outstanding.The monitoring technology of Optical Signal To Noise Ratio is key technology wherein, because the error rate that signal receives directly depends on Optical Signal To Noise Ratio (OSNR).In wavelength-division multiplex system (WDM), the amplified spontaneous emission noise (ASE) in signal band is logical is along with the use of image intensifer constantly accumulates.Band is logical outer through repeatedly filtering.Along with introducing that can dropinsert MUX (ROADM), different channels is by multiplexing, the demultiplexing of the different number of times of experience and route, and the noise power level in the noise power level outside band and band is different.Traditional spectrometer (OSA) interpolation method is no longer applicable.It is particularly important that optical signal-to-noise ratio monitoring in band seems.
In existing measurement OSNR technology, the transmission ends of nonlinear optical loop mirror (NOLM ring) has nonlinear power transfer, can pass through high power, suppresses low-power.To input into the power amplification of light detection device to some fixing operating points, Optical Signal To Noise Ratio will have one-to-one relationship with power output, utilize this characteristic can be for optical monitoring signal.The people such as the Benjamin J.Eggleton of Univ Melbourne Australia have delivered one piece of paper [1], have proposed the optical signal-to-noise ratio monitoring technology in a kind of band, and the sensitivity of this technical monitoring and scope are all very limited.
List of references:
[1]Rhys?Adams，Martin?Rochette，Trina?T.Ng，and?Benjamin?J.Eggleton“All-Optical?In-Band?O?SNR?Monitoring?at?40?Gb/s?Using?a?Nonlinear?Optical?Loop?Mirror”Photon.Technol.Lett.18(2006)469.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: how to realize the monitoring to signal OSNR at a high speed dynamic ROADM, and make monitoring sensitivity higher, monitoring range is larger.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of optical signal-to-noise ratio monitoring device, comprising: image intensifer, the first polarization control component, circulator, coupler, nonlinear optical element, attenuator, the second polarization control component, the first power meter and the second power meter.
The output of described image intensifer connects described the first polarization control component, the output of described the first polarization control component connects the first port of described circulator, the second port of described circulator is connected respectively the first port of described coupler and the input of described the second power meter with the 3rd port, the second port of described coupler connects the input of described the first power meter, the 3rd port is connected respectively described nonlinear optical element and the second polarization control component with the 4th port, and described nonlinear optical element is connected respectively attenuator with the second polarization control component.
Wherein, described image intensifer is erbium-doped fiber amplifier.
Wherein, the first port of described circulator and the second port Insertion Loss are less than 1dB.
Wherein, the splitting ratio of described coupler is 1: 1.
Wherein, described attenuator is polarization irrelevant.
Wherein, described the first polarization control component and the second polarization control component are manual Polarization Controller or electronic Polarization Controller.
Wherein, described nonlinear optical element is highly nonlinear optical fiber (HNLF), and nonlinearity is 10～200 (W
-1km
-1).
Wherein, the be less than-30dBm of minimum probe power of described the first power meter and the second power meter.
The present invention also provides a kind of method of utilizing above-mentioned optical signal-to-noise ratio monitoring device monitoring Optical Signal To Noise Ratio, signal to be monitored is inputted to described optical signal-to-noise ratio monitoring device, adjust gain current output peak power is amplified to transmission ends and reflection end power tranmittance curve A the first extreme point power demand, light after amplifying is input to the input of circulator, obtain the difference of through-put power and reflection power, the corresponding relation curve B of the contrast Optical Signal To Noise Ratio of input signal and the difference of transmission ends and reflection end power, obtain the Optical Signal To Noise Ratio of described measured signal, described transmission ends is that described coupler is to the input of described the first power meter, described reflection end is that described coupler is to the input of described circulator.
Wherein, before being inputted to described optical signal-to-noise ratio monitoring device, signal to be monitored also comprises step:
S1: input direct-current light (being less than 1mW) enters described optical signal-to-noise ratio monitoring device, and reach maximum and the polarization state of reflection end power (maximum and minimum value difference are about 30dB) fixing described first polarization control component and second polarization control component while reaching minimum value when transmission ends power;
S2: keep described operating state, progressively increase the power of incident light, in a plurality of moment, record incident optical power, and the luminous power of the transmission ends under this incident optical power and reflection end, draw out transmission ends and reflection end power tranmittance curve A, find first extreme point of transmission curve or reflectivity curve, as light operating point, record input optical power now;
S3: the intensity-modulated signal of inputting a loading noise identical with the duty ratio of measured signal, the peak power of described intensity-modulated signal is amplified to described smooth operating point, change and Optical Signal To Noise Ratio, transmission ends and the reflection end power of write input poor the corresponding relation curve B of the drafting Optical Signal To Noise Ratio of input signal and the difference of transmission ends and reflection end power.
(3) beneficial effect
By optical signal-to-noise ratio monitoring device of the present invention and monitoring method, realize the monitoring to signal OSNR at a high speed dynamic ROADM, and obviously improved monitoring sensitivity, increased monitoring range.
Accompanying drawing explanation
Fig. 1 is a kind of optical signal-to-noise ratio monitoring apparatus structure schematic diagram of the embodiment of the present invention;
Fig. 2 utilizes the transmission ends obtaining of installing in Fig. 1 and the curve chart of reflection end power tranmittance curve A;
Fig. 3 adopts apparatus and method of the present invention to OSNR monitoring effect figure, is also the curve chart of corresponding relation curve B of the difference of Optical Signal To Noise Ratio and transmission ends and reflection end power;
Fig. 4 adopts scheme in list of references [1] to OSNR monitoring effect figure.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
As shown in Figure 1, optical signal-to-noise ratio monitoring device of the present invention, comprising: image intensifer 1, the first polarization control component 2, circulator 3, coupler 4, nonlinear optical element 5, attenuator 6, the second polarization control component 7, the first power meter 8 and the second power meter 9,
The output of image intensifer 1 connects the first polarization control component 2, the output of the first polarization control component 2 connects the first port of circulator 3, the first port of the second port of circulator 3 and the 3rd port difference butt coupling device 4 and the input of the second power meter 9, the second port of coupler 4 connects the input of the first power meter 8, the 3rd port is connected respectively nonlinear optical element 5 and the second polarization control component 7 with the 4th port, and nonlinear optical element 5 is connected respectively attenuator 6 with the second polarization control component 7.
Measured signal is after image intensifer 1 amplifies, enter the first polarization control component 2, from the first polarization control component 2 output outputs, enter the first port A of circulator 3, the second port B output from circulator 3, enter the first port of coupler 4 1., be divided into splitting ratio and be the two-beam of 1: 1, from the 3rd port the 3. with four port of coupler 4,4. export respectively.The light that 3. the 3rd port is exported passes through respectively nonlinear optical element 5, attenuator 6 and the second polarization control component 7 successively, then from 4. input coupler 4 of the 4th port; Light that 4. the 4th port is exported is the second polarization control component 7, attenuator 6 and nonlinear optical element 5 successively respectively, then from 3. input coupler 4 of the 3rd port.Above-mentioned two-beam is after coupler 4 converges, from coupler 4 first ports, 1. 2. export with coupler 4 second ports respectively, the light that 1. coupler 4 first ports are exported enters from the second port B of circulator 3, the 3rd port C output from circulator 3, enter the second power meter 9, the light that 2. coupler 4 second ports are exported enters the value that the first power meter 8, the first power meters 8 and the second power meter 9 obtain and subtracts each other, the transmission ends obtaining and the difference power of reflection end.
Preferably, image intensifer 1 is erbium-doped fiber amplifier; The first port of circulator 3 and the second port Insertion Loss are less than 1dB, and belt direction is clockwise direction; Coupler 4 is two to enter scene 2, and splitting ratio is 1: 1; Attenuator 6 is polarization irrelevants; The first polarization control component 2 and the second polarization control component 7 are manual Polarization Controller or electronic Polarization Controller; Nonlinear optical element 5 is highly nonlinear optical fiber, and length is 1km, and nonlinearity is 10～200 (W
-1km
-1), be preferably 10.5 (W
-1km
-1); Be less than-the 30dBm of minimum probe power of the first power meter 8 and the second power meter 9.
The present invention also provides the monitoring method of utilizing above-mentioned optical signal-to-noise ratio monitoring device monitoring Optical Signal To Noise Ratio, before monitoring, comprises:
Step S1, input direct-current light enters described optical signal-to-noise ratio monitoring device (as: power is the direct current light that is less than 1mW), and reaches maximum and the polarization state of reflection end power (maximum and minimum value difference are about 30dB) fixing described first polarization control component and second polarization control component while reaching minimum value when transmission ends power.
Step S2, keep described operating state, progressively increase the power of incident light, record under the incident optical power in first moment simultaneously, the luminous power of transmission ends and reflection end, draws out transmission ends and reflection end power tranmittance curve A, finds first extreme point of transmission curve or reflectivity curve, as light operating point, record input optical power now.As shown in Figure 2, the schematic diagram of curve A, transverse axis is input direct-current luminous power, unit is W, with the curve of square, is the transmittance curve ratio of input power (transmission power with); With the curve of circle, be the reflectance curve ratio of input power (reflection power with), figure upward arrow indication input power is light operating point (OP).
Step S3, the intensity-modulated signal of the loading noise that input one is identical with the duty ratio of measured signal, the peak power of described intensity-modulated signal is amplified to described smooth operating point, change and Optical Signal To Noise Ratio, transmission ends and the reflection end power of write input poor, draw the corresponding relation curve B of the Optical Signal To Noise Ratio of input signal and the difference of transmission ends and reflection end power, as shown in Figure 3.OSNR correspondences different in curve B the difference power of different output.
During monitoring, by signal input optical signal-to-noise ratio monitoring device to be monitored, adjust gain current output peak power is amplified to light operating point power demand, light after amplifying is input to the input of circulator, obtain the difference of through-put power and reflection power, by the relation between least square fitting OSNR and power output, contrast described curve B, obtain the Optical Signal To Noise Ratio OSNR of described measured signal.
Utilize said apparatus and method can obviously improve sensitivity and the monitoring range of OSNR monitoring.Provide an example that monitoring effect is described below:
Measured signal: 10Gb/s nonreturn to zero code intensity-modulated signal (NRZ-OOK), as shown in Figure 4, adopts the monitoring effect figure that in document [1], technology records.Transverse axis is Optical Signal To Noise Ratio OSNR, and the longitudinal axis is power output.As shown in Figure 3, the monitoring effect figure that adopts technology that the present invention carries to record.Transverse axis is Optical Signal To Noise Ratio OSNR, and the longitudinal axis is power output.With the change sensitivity for every dB OSNR, be greater than 0.1dB and be as the criterion, from Fig. 4, can monitor the OSNR within the scope of 12～17dB.Power output contrast (obtainable peak power deducts lowest power) is 2.3dB.From Fig. 3, can monitor the OSNR within the scope of 10～23dB.Monitoring range has increased 8dB.Power output contrast is 12.2dB.Contrast has improved 9.9dB.Corresponding sensitivity is also improved largely.
Above execution mode is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (9)
1. an optical signal-to-noise ratio monitoring device, it is characterized in that, comprise: image intensifer (1), the first polarization control component (2), circulator (3), coupler (4), nonlinear optical element (5), attenuator (6), the second polarization control component (7), the first power meter (8) and the second power meter (9)
The output of described image intensifer (1) connects described the first polarization control component (2), the output of described the first polarization control component (2) connects the first port of described circulator (3), the second port of described circulator (3) is connected respectively the first port of described coupler (4) and the input of described the second power meter (9) with the 3rd port, the second port of described coupler (4) connects the input of described the first power meter (8), the 3rd port is connected respectively described nonlinear optical element (5) and the second polarization control component (7) with the 4th port, described nonlinear optical element (5) is connected respectively attenuator (6) with the second polarization control component (7),
Measured signal is after image intensifer (1) amplifies, enter the first polarization control component (2), from the first polarization control component (2) output, export, enter the first port of circulator (3), the second port output from circulator 3, enter the first port of coupler (4), be divided into the two-beam that splitting ratio is 1:1, from the 3rd port and the 4th port of coupler (4), export respectively; The light of the 3rd port output passes through respectively nonlinear optical element (5), attenuator (6) and the second polarization control component (7) successively, then from the 4th port input coupler (4); The light difference of the 4th port output is the second polarization control component (7), attenuator (6) and nonlinear optical element (5) successively, then from the 3rd port input coupler (4); Above-mentioned two-beam is after coupler (4) converges, respectively from coupler (4) first ports and coupler (4) second port outputs, the light of coupler (4) first port outputs enters from the second port of circulator (3), the 3rd port output from circulator 3, enter the second power meter (9), the light of coupler (4) second port outputs enters the first power meter (8), the value that the first power meter (8) and the second power meter (9) obtain is subtracted each other, the transmission ends obtaining and the difference power of reflection end;
Input direct-current light enters described optical signal-to-noise ratio monitoring device, and reaches maximum and the polarization state of reflection end power fixing described the first polarization control component and second polarization control component while reaching minimum value when transmission ends power;
Keep described operating state, progressively increase the power of incident light, in a plurality of moment, record incident optical power, and the luminous power of the transmission ends under this incident optical power and reflection end, draw out transmission ends and reflection end power tranmittance curve A, find first extreme point of transmission curve or reflectivity curve, as light operating point, record input optical power now;
The intensity-modulated signal of the loading noise that input one is identical with the duty ratio of measured signal, the peak power of described intensity-modulated signal is amplified to described smooth operating point, change and Optical Signal To Noise Ratio, transmission ends and the reflection end power of write input poor the corresponding relation curve B of the drafting Optical Signal To Noise Ratio of input signal and the difference of transmission ends and reflection end power;
Signal to be monitored is inputted to described optical signal-to-noise ratio monitoring device, adjust gain current output peak power is amplified to transmission ends and reflection end power tranmittance curve A the first extreme point power demand, light after amplifying is input to the input of circulator, obtain the difference of through-put power and reflection power, the corresponding relation curve B of the contrast Optical Signal To Noise Ratio of input signal and the difference of transmission ends and reflection end power, obtain the Optical Signal To Noise Ratio of described measured signal, described transmission ends is that described coupler (4) is to the input of described the first power meter (8), described reflection end is that described coupler (4) is to the input of described circulator (3).
2. optical signal-to-noise ratio monitoring device as claimed in claim 1, is characterized in that, described image intensifer (1) is erbium-doped fiber amplifier.
3. optical signal-to-noise ratio monitoring device as claimed in claim 1, is characterized in that, the first port of described circulator (3) and the second port Insertion Loss are less than 1dB.
4. optical signal-to-noise ratio monitoring device as claimed in claim 1, is characterized in that, the splitting ratio of described coupler (4) is 1:1.
5. optical signal-to-noise ratio monitoring device as claimed in claim 1, is characterized in that, described attenuator (6) is polarization irrelevant.
6. optical signal-to-noise ratio monitoring device as claimed in claim 1, is characterized in that, described the first polarization control component (2) and the second polarization control component (7) are manual Polarization Controller or electronic Polarization Controller.
7. optical signal-to-noise ratio monitoring device as claimed in claim 1, is characterized in that, described nonlinear optical element (5) is highly nonlinear optical fiber, and nonlinearity is 10～200(W
-1km
-1).
8. optical signal-to-noise ratio monitoring device as claimed in claim 1, is characterized in that, the be less than-30dBm of minimum probe power of described the first power meter (8) and the second power meter (9).
9. a method of utilizing the optical signal-to-noise ratio monitoring device monitoring Optical Signal To Noise Ratio described in any one in claim 1～8, it is characterized in that, signal to be monitored is inputted to described optical signal-to-noise ratio monitoring device, adjust gain current output peak power is amplified to transmission ends and reflection end power tranmittance curve A the first extreme point power demand, light after amplifying is input to the input of circulator, obtain the difference of through-put power and reflection power, the corresponding relation curve B of the contrast Optical Signal To Noise Ratio of input signal and the difference of transmission ends and reflection end power, obtain the Optical Signal To Noise Ratio of described measured signal, described transmission ends is that described coupler (4) is to the input of described the first power meter (8), described reflection end is that described coupler (4) is to the input of described circulator (3),
Before being inputted to described optical signal-to-noise ratio monitoring device, signal to be monitored also comprises step:
S1: input direct-current light enters described optical signal-to-noise ratio monitoring device, and reach maximum and the polarization state of reflection end power fixing described the first polarization control component and second polarization control component while reaching minimum value when transmission ends power;
S2: keep described operating state, progressively increase the power of incident light, in a plurality of moment, record incident optical power, and the luminous power of the transmission ends under this incident optical power and reflection end, draw out transmission ends and reflection end power tranmittance curve A, find first extreme point of transmission curve or reflectivity curve, as light operating point, record input optical power now;
S3: the intensity-modulated signal of inputting a loading noise identical with the duty ratio of measured signal, the peak power of described intensity-modulated signal is amplified to described smooth operating point, change and Optical Signal To Noise Ratio, transmission ends and the reflection end power of write input poor the corresponding relation curve B of the drafting Optical Signal To Noise Ratio of input signal and the difference of transmission ends and reflection end power.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012109894A1 (en) * | 2011-09-02 | 2012-08-23 | 华为技术有限公司 | Method and device for determining total optical signal to noise ratio penalty of optical fibre communication system |
| CN102624448B (en) * | 2012-03-08 | 2014-05-28 | 西南交通大学 | OSNR (Optical Signal To Noise Ratio) monitor based on polarization multiplexing signal |
| CN104104447B (en) * | 2013-04-10 | 2018-08-24 | 南京中兴新软件有限责任公司 | Light power equalization method and device |
| CN105830365B (en) * | 2014-04-17 | 2018-10-12 | 华为技术有限公司 | A kind of monitoring method and device of optical signal to noise ratio |
| CN105227233B (en) * | 2014-05-30 | 2017-11-03 | 北京邮电大学 | The interior optical signal-to-noise ratio monitoring method of band based on asymmetric Mach-Zehnder interferometer in parallel |
| CN104601223B (en) * | 2015-01-14 | 2017-04-12 | 华中科技大学 | Optical signal-to-noise ratio (OSNR) monitoring device and method for WDM (wavelength division multiplexing) system |
| CN105610496B (en) * | 2015-12-18 | 2017-12-08 | 陈骋 | The computational methods of the built in advance transmission network OSNR analogues value |
| CN106130628B (en) * | 2016-07-12 | 2019-04-05 | 北京邮电大学 | A kind of monitoring method and device of optical signal to noise ratio |
| CN110048770B (en) * | 2019-05-08 | 2021-08-24 | 武汉邮电科学研究院有限公司 | In-band optical signal-to-noise ratio monitoring method and module based on ROADM network |
| CN117579139A (en) * | 2024-01-15 | 2024-02-20 | 成都电科星拓科技有限公司 | Optical component anti-reflection test device, method, system and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001078264A2 (en) * | 2000-02-14 | 2001-10-18 | Xtera Communications, Inc. | Nonlinear optical loop mirror |
| CN1492619A (en) * | 2003-09-24 | 2004-04-28 | 烽火通信科技股份有限公司 | Light signal-noise ratio monitoring method for optical transmission system |
| CN1720680A (en) * | 2002-12-16 | 2006-01-11 | 特瑞林克通讯有限公司 | OSNR monitoring method and apparatus using tunable optical bandpass filter and polarization nulling method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001078264A2 (en) * | 2000-02-14 | 2001-10-18 | Xtera Communications, Inc. | Nonlinear optical loop mirror |
| CN1720680A (en) * | 2002-12-16 | 2006-01-11 | 特瑞林克通讯有限公司 | OSNR monitoring method and apparatus using tunable optical bandpass filter and polarization nulling method |
| CN1492619A (en) * | 2003-09-24 | 2004-04-28 | 烽火通信科技股份有限公司 | Light signal-noise ratio monitoring method for optical transmission system |
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