CN116405106A - Optical signal to noise ratio measuring method and system - Google Patents
Optical signal to noise ratio measuring method and system Download PDFInfo
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- CN116405106A CN116405106A CN202111630817.3A CN202111630817A CN116405106A CN 116405106 A CN116405106 A CN 116405106A CN 202111630817 A CN202111630817 A CN 202111630817A CN 116405106 A CN116405106 A CN 116405106A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 262
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 230000000694 effects Effects 0.000 claims abstract description 13
- 238000001914 filtration Methods 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 10
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 239000000835 fiber Substances 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 3
- 229910052691 Erbium Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07953—Monitoring or measuring OSNR, BER or Q
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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Abstract
The application provides a method and a system for measuring an optical signal to noise ratio, and relates to the technical field of optical transmission networks. The optical signal to noise ratio measuring method comprises the following steps: acquiring a narrow-band optical signal, wherein the narrow-band optical signal simulates a business optical signal to be transmitted in an optical channel, and the narrow-band optical signal is not influenced by a filtering effect and crosstalk of optical signals of adjacent optical channels; acquiring out-of-band background noise and optical power of the narrow-band optical signal through the calibrated optical performance detection module; and calculating the signal to noise ratio of the optical channel according to the out-of-band background noise and the optical power. The method is applied to the OTN network, and aims to acquire more accurate out-of-band noise power, so that the accuracy of the signal to noise ratio obtained by final calculation is improved.
Description
Technical Field
The embodiment of the application relates to the technical field of optical transmission networks, in particular to a method and a system for measuring an optical signal to noise ratio.
Background
OSNR (Optical Signal Noise Ratio, optical signal to noise ratio) to describe signal impairments caused by ASE noise (amplifier spontaneousemissionnoise, amplifier self-radiated noise) in the fiber link. Since OSNR is related to BER (Bit Error Ratio), the transmission performance of the final optical network can be predicted by the OSNR monitored in real time. The key point for accurate OSNR monitoring is the measurement of noise in the belt. With commercial deployment of 40G and 100G systems, on one hand, the edges of service signals overlap due to the effects of filtering effects of a ROADM (Reconfigurable Optical Add-Drop Multiplexer) site and crosstalk of adjacent channels, so that out-of-band noise power cannot be accurately obtained due to overlapping of out-of-band noise, and further accurate in-band noise cannot be obtained, and finally, the accuracy of OSNR measurement is affected. On the other hand, if no traffic signal is present in the link, the spontaneous emission noise of the amplifier cannot accurately replace the noise with the outsole when the traffic signal is present. Therefore, this method also fails to accurately obtain noise with an insole, and further fails to perform accurate OSNR.
Disclosure of Invention
The embodiment of the application mainly aims to provide a method and a system for measuring an optical signal to noise ratio, aiming at obtaining more accurate out-of-band noise power and improving the accuracy of the signal to noise ratio obtained by final calculation.
In order to achieve the above objective, an embodiment of the present application provides a method for measuring an osnr, including: acquiring a narrow-band optical signal, simulating transmission of a business optical signal in an optical channel through the narrow-band optical signal, wherein the bandwidth of the narrow-band optical signal enables the narrow-band optical signal not to be influenced by a filtering effect and business optical signal crosstalk in an optical channel adjacent to the optical channel; acquiring out-of-band noise power and optical power of the narrow-band optical signal through the calibrated optical performance detection module; and calculating the signal to noise ratio of the optical channel according to the out-of-band noise power and the optical power.
In order to achieve the above objective, an embodiment of the present application further provides an osnr measurement system, including:
the optical signal generation module is used for generating a narrow-band optical signal, simulating the transmission of the service optical signal in the optical channel through the narrow-band optical signal, and the narrow-band optical signal is not influenced by a filtering effect and the crosstalk of the service optical signal of the adjacent optical channel;
and the optical performance detection module is used for acquiring the out-of-band noise power and the optical power of the narrow-band optical signal and calculating the signal to noise ratio of the optical channel according to the out-of-band noise power and the optical power.
According to the method and the system for measuring the optical signal to noise ratio, the narrowband optical signals are adopted to simulate the transmission of the service optical signals in the optical channel, the narrowband bandwidth of the narrowband optical signals is free from the influence of filtering effect and crosstalk of the service optical signals in the adjacent optical channels, namely, the edges of the narrowband optical signals are not overlapped with the edges of other service signals, so that the out-of-band noise power of the narrowband optical signals can be accurately obtained through the calibrated optical performance detection module, and the optical signal to noise ratio can be accurately obtained according to the out-of-band noise power and the optical power of the narrowband optical signals.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings.
FIG. 1 is a flow chart of a method for measuring optical signal to noise ratio provided by an embodiment of the present application;
FIG. 2 is a schematic diagram of a measurement system for osnr according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a measurement system for osnr according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, as will be appreciated by those of ordinary skill in the art, in the various embodiments of the present application, numerous technical details have been set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not be construed as limiting the specific implementation of the present application, and the embodiments may be mutually combined and referred to without contradiction.
The embodiment of the application relates to a method for measuring an optical signal to noise ratio, as shown in fig. 1, comprising the following steps:
In one embodiment, step 101 specifically includes: acquiring an optical signal through a light source; amplifying the optical power of the optical signal to enable the fiber-entering power of the optical signal to be consistent with the fiber-entering power of the service optical signal; and adjusting the frequency and bandwidth of the optical signal with the amplified optical power to obtain a narrow-band optical signal. When the wavelength and bandwidth of the optical signal with amplified optical power are adjusted, the final objective of the adjustment is to make the optical signal not affected by the filtering effect and crosstalk of the traffic optical signal in the optical channel adjacent to the optical channel. In addition, the light source is applicable to two situations generated by the OTN network device and the external light source.
In one embodiment, before step 102, the method further includes: acquiring a test optical signal, wherein the true value of the center wavelength of the test optical signal is known, and the true value of the optical power of the test optical signal is known; acquiring a center wavelength measurement value and an optical power measurement value of a test optical signal through an optical performance detection module; acquiring calibration parameters according to the center wavelength true value, the center wavelength measured value, the optical power true value and the optical power measured value; and calibrating the detection result of the optical performance detection module according to the calibration parameters.
In this embodiment, the optical performance detection module calibrates the optical power detection accuracy and the center wavelength detection accuracy when shipped from the factory, so as to meet the actual requirements of the optical transmission network. In practical use, due to the influence of temperature change and the like, certain drift occurs in the optical power detection and the center wavelength detection of the OPM. It must be calibrated to ensure accuracy of the detection.
Specifically, when calibrating the optical performance detection module, test signals with different center wavelengths and different optical powers can be acquired multiple times, then a plurality of calibration parameters are acquired, and the final calibration parameters are obtained by averaging the plurality of calibration parameters. The calibration parameters include a center wavelength calibration parameter and an optical power calibration parameter. And calibrating the detection result obtained by the optical performance detection module through the two calibration parameters. In addition, the wavelength of the test optical signal at the time of calibration may or may not be the ITU service wavelength.
In this embodiment, step 103 specifically includes: interpolation is carried out on the out-of-band noise of the narrow-band optical signal, and the in-band noise power of the narrow-band optical signal is calculated according to the out-of-band noise power; and calculating the optical signal to noise ratio according to the in-band noise power and the optical power. That is, the in-band noise power can be easily obtained by the out-of-band noise power, whereby the optical signal-to-noise ratio can be calculated. Specifically, the formula for calculating the osnr is:
wherein P is i The optical signal power of the ith channel is linear unit watt; n (N) i Is the i-th channel noise equivalent bandwidth B m ASE noise power measured in range, using linear unit watt; b (B) r Is the reference bandwidth of light, usually 0.1nm or 12.5GHz (converted from C-band 0.1 nm), and B m The units remain consistent.
According to the optical signal-to-noise ratio measuring method, the narrowband optical signals are adopted to simulate service optical signals to be transmitted in the optical channel, the narrowband bandwidth of the narrowband optical signals is free from the influence of filtering effect and service optical signal crosstalk in the adjacent optical channel, namely, the edges of the narrowband optical signals are not overlapped with the edges of other service signals, so that the out-of-band noise power of the narrowband optical signals can be accurately obtained through the calibrated optical performance detecting module, and the optical signal-to-noise ratio can be accurately obtained according to the out-of-band noise power and the optical power of the narrowband optical signals.
Moreover, it should be understood that the above steps of the various methods are divided, for clarity of description, and may be combined into one step or split into multiple steps when implemented, so long as they include the same logic relationship, and all the steps are within the scope of protection of the present patent; it is within the scope of this patent to add insignificant modifications to the process or introduce insignificant designs, but not to alter the core design of the process.
An embodiment of the present application relates to a measurement system of optical signal to noise ratio, as shown in fig. 2, including:
an optical signal generating module 201, configured to generate a narrowband optical signal, through which a service optical signal is simulated to be transmitted in an optical channel, where a bandwidth of the narrowband optical signal is such that the narrowband optical signal is not affected by a filtering effect and crosstalk of the service optical signal in an optical channel adjacent to the optical channel;
the optical performance detection module 202 obtains the out-of-band noise power and the optical power of the narrowband optical signal, and calculates the signal to noise ratio of the optical channel according to the out-of-band noise power and the optical power.
Further, the optical signal generating module 201 further includes: a light source 2011, a signal amplifier 2012, a signal adjuster 2013; the light source 2011 is used for generating an optical signal; the signal amplifier 2012 is configured to amplify the power of the optical signal, so that the fiber-in power of the optical signal is consistent with the fiber-in power of the service optical signal; the signal adjuster 2013 is configured to adjust the frequency and bandwidth of the optical signal with amplified optical power, and obtain a narrowband optical signal.
In addition, the light source 2011 may be an optical amplifier or a single wavelength tunable laser, in particular. The signal conditioner 2013 may be a wavelength selector. Further, the optical amplifier may be an erbium doped fiber amplifier or a raman fiber amplifier or other types of optical amplifiers.
In an embodiment, the measurement system may further include: a light splitting module 203 connected to the light signal generating module 201 and the light performance detecting module 202, respectively; the light splitting module 203 is configured to obtain narrowband signal light indicated by a preset light splitting ratio from the optical channel, and transmit the narrowband signal light to the optical performance detecting module. Further, the optical splitting module 203 may be a wavelength-selectable filter, or may be an optical splitter without a wavelength-selecting function. Such as: when the light splitting ratio is 1/99, the light splitter can acquire one percent of optical signals from the optical channel, the optical signals comprise narrowband optical signals and other service optical signals, and the optical performance detection module can determine the out-of-band noise power of the narrowband optical signals according to the wavelength of the narrowband optical signals.
The positions of the signal amplifier and the signal adjuster may be interchanged, and the positions of the respective devices are not limited to the specific embodiments herein.
In an embodiment, as shown in fig. 3, the erbium doped fiber amplifier EDFA (1) is used as a light source to output a broad spectrum signal light, and the wavelength selector WSS is used as a signal adjuster to adjust the wavelength and bandwidth of the broad spectrum signal light, so that the edge of the broad spectrum signal light is not overlapped with the edge of the traffic light signal in other optical channels, such as: the parameters of the narrow-band optical signal are 20Db spectrum width less than 0.1nm and 12.5Ghz. The erbium-doped fiber amplifier EDFA (2) is used as a signal amplifier and is used for amplifying the wide-spectrum signal light, so that the fiber-in power of the wide-spectrum signal light is consistent with the fiber-in power of the normal service optical signal, and finally a narrow-band optical signal is obtained. The wavelength selectable filter serves as a light splitting module for forwarding the narrowband signal light selected from the optical channel according to the wavelength in the optical channel to the optical performance detection module OPM.
According to the optical signal-to-noise ratio measuring system, the narrowband optical signals are adopted to simulate service optical signals to be transmitted in the optical channel, the narrowband bandwidth of the narrowband optical signals is free from the influence of filtering effect and service optical signal crosstalk in the adjacent optical channel, namely, the edges of the narrowband optical signals are not overlapped with the edges of other service signals, so that the out-of-band noise power of the narrowband optical signals can be accurately obtained through the calibrated optical performance detecting module, and the optical signal-to-noise ratio can be accurately obtained according to the out-of-band noise power and the optical power of the narrowband optical signals.
It is easy to find that this embodiment is a system embodiment corresponding to the embodiment of the osnr measurement method, and this embodiment may be implemented in cooperation with the above embodiment. The related technical details mentioned in the above embodiments are still valid in this embodiment, and are not repeated here for reducing repetition. Accordingly, the related technical details mentioned in the present embodiment can also be applied in the above-described method embodiments.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific embodiments in which the present application is implemented and that various changes in form and details may be made therein without departing from the spirit and scope of the present application.
Claims (10)
1. A method for measuring optical signal to noise ratio, comprising:
acquiring a narrow-band optical signal, simulating transmission of a business optical signal in an optical channel through the narrow-band optical signal, wherein the bandwidth of the narrow-band optical signal enables the narrow-band optical signal not to be influenced by a filtering effect and business optical signal crosstalk in an optical channel adjacent to the optical channel;
acquiring out-of-band noise power and optical power of the narrow-band optical signal through the calibrated optical performance detection module;
and calculating the signal to noise ratio of the optical channel according to the out-of-band noise power and the optical power.
2. The method for measuring an osnr according to claim 1, wherein the obtaining a narrowband optical signal comprises:
acquiring an optical signal through a light source;
amplifying the optical power of the optical signal to enable the fiber-entering power of the optical signal to be consistent with the fiber-entering power of the service optical signal;
and adjusting the wavelength and bandwidth of the optical signal with the amplified optical power to obtain a narrow-band optical signal.
3. The method according to claim 1, wherein before the obtaining the out-of-band noise power and the optical power of the narrowband optical signal by the calibrated optical performance monitoring module, further comprises:
acquiring a test optical signal, wherein the true value of the center wavelength of the test optical signal is known, and the true value of the optical power of the test optical signal is known;
acquiring a center wavelength measurement value and an optical power measurement value of a test optical signal through an optical performance detection module;
acquiring calibration parameters according to the center wavelength true value, the center wavelength measured value, the optical power true value and the optical power measured value;
and calibrating the detection result of the optical performance detection module according to the calibration parameters.
4. The method according to claim 1, wherein calculating the signal-to-noise ratio of the optical channel according to the out-of-band noise power and the optical power comprises:
interpolation is carried out on the out-of-band noise of the narrow-band optical signal, and the in-band noise power of the narrow-band optical signal is calculated according to the out-of-band noise power;
and calculating the optical signal to noise ratio according to the in-band noise power and the optical power.
5. A system for measuring optical signal-to-noise ratio, comprising:
the optical signal generation module is used for generating a narrow-band optical signal, simulating the transmission of the service optical signal in the optical channel through the narrow-band optical signal, and the bandwidth of the narrow-band optical signal ensures that the narrow-band optical signal is not influenced by a filtering effect and the crosstalk of the service optical signal in the optical channel adjacent to the optical channel;
and the optical performance detection module is used for acquiring the out-of-band noise power and the optical power of the narrow-band optical signal and calculating the signal to noise ratio of the optical channel according to the out-of-band noise power and the optical power.
6. The optical signal-to-noise ratio measurement system of claim 5, wherein the optical signal generation module comprises: a light source, a signal amplifier, and a signal adjuster;
the light source is used for generating an optical signal;
the signal amplifier is used for amplifying the power of the optical signal so that the fiber-entering power of the optical signal is consistent with the fiber-entering power of the service optical signal;
the signal adjuster is used for adjusting the wavelength and the bandwidth of the optical signal with the amplified optical power to obtain a narrow-band optical signal.
7. The optical signal to noise ratio measurement system of claim 6, wherein the light source is an optical amplifier or a single wavelength tunable laser.
8. The osnr measurement system according to claim 6, wherein the signal conditioner is a wavelength selector.
9. The osnr measurement system according to claim 5, wherein the system further comprises: the light splitting module is respectively connected with the light signal generating module and the light performance detecting module;
the light splitting module is used for acquiring narrow-band signal light indicated by a preset light splitting ratio from the light channel and transmitting the narrow-band signal light to the light performance detection module.
10. The osnr measurement system according to claim 9, wherein the optical splitting module is an optical splitter or a wavelength selectable filter.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111630817.3A CN116405106A (en) | 2021-12-28 | 2021-12-28 | Optical signal to noise ratio measuring method and system |
| PCT/CN2022/138488 WO2023124950A1 (en) | 2021-12-28 | 2022-12-12 | Optical signal noise ratio measurement method and system |
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| CN202111630817.3A CN116405106A (en) | 2021-12-28 | 2021-12-28 | Optical signal to noise ratio measuring method and system |
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| US20100142956A1 (en) * | 2008-12-08 | 2010-06-10 | Tellabs Operation, Inc. | Method and Apparatus for Reshaping a Channel Signal |
| WO2010139355A1 (en) * | 2009-06-01 | 2010-12-09 | Telefonaktiebolaget Lm Ericsson (Publ) | Monitoring optical parameters of a modulated optical signal |
| CN104539358B (en) * | 2014-12-26 | 2017-05-10 | 武汉光迅科技股份有限公司 | Method and device for detecting noise of erbium-doped optical fiber amplifier in real time |
| CN105281827B (en) * | 2015-09-29 | 2017-11-14 | 武汉光迅科技股份有限公司 | Erbium-doped fiber amplifier real-time detecting system |
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