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Modulation format recognition method and system based on variance analysis

A modulation format and identification system technology, applied in the field of modulation format identification method and system based on variance analysis, can solve the problems of complex operation, high complexity, large comparison library, etc., to avoid complex calculations, high identification accuracy, and method simple effect

Inactive Publication Date: 2016-12-07
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

Modulation format recognition takes a lot of time to train, and the complexity is high
The method based on principal component analysis requires a large comparison library, which is not suitable for non-dispersion compensation optical fiber networks, and the operation is complicated
Modulation format identification based on Stokes space is mainly used in digital coherent receivers, which are complex and not suitable for intermediate node detection

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  • Modulation format recognition method and system based on variance analysis
  • Modulation format recognition method and system based on variance analysis
  • Modulation format recognition method and system based on variance analysis

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Embodiment Construction

[0035] Such as figure 1 As shown, the overall description of the transmission link:

[0036] Transmitter (TX): 8 kinds of optical signals are transmitted in the optical transmission link as transmission signals after modulation.

[0037] The signals are 10Gbps and 20Gbps RZ-OOK: return-to-zero on-off keying signal. 40Gbps, 100Gbps PM-RZ-QPSK: dual polarization return-to-zero quadrature phase-shift keying. 100G, 200Gbps PM-RZ-16QAM: dual polarization return-to-zero quadrature amplitude modulation. 40Gbps, 100Gbps PM-Nyquist-QPSK: Dual polarization Nyquist quadrature phase shift keying.

[0038] Optical signals are transmitted in optical fiber links, and we extract a small amount of light from the transmission link for modulation format identification. The extracted optical signal passes through an optical filter (OBPF) and a tunable dispersion compensation module (TDC) respectively, and is photoelectrically converted into an electrical signal by a photodiode (PD). Coordina...

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Abstract

The invention provides a modulation format recognition method and system based on variance analysis. The modulation format recognition method comprises: a test signal generation step of performing asynchronous delay sampling on a test signal to obtain a test signal X_test; a test signal variance calculation step of calculating the variance of the test signal X_test; and a processing step of calculating a Euclid distance between the variance of the test signal X_test and a library vector C_lab in a comparison library, judging whether the Euclid distance is a minimum Euclid distance or not, if so, performing modulation format output, otherwise, not performing output. The method and the system have the beneficial effects that a modulation format of an optical communication signal is recognized effectively through a variance analyzing algorithm, and recognition is performed by features of the signal under the condition of low chromatic dispersion, so that complex calculation in the prior art is avoided. The method is simple, and online recognition can be performed. The requirement on the system is lower than that of a conventional method; and the recognition accuracy for the modulation format is high.

Description

technical field [0001] The invention relates to the field of optical performance monitoring, in particular to a modulation format identification method and system based on variance analysis. Background technique [0002] Optical performance monitoring is a relatively new research direction, and currently there are the following main research technologies: [0003] 1. Modulation format recognition based on artificial neural network: perform asynchronous delay sampling on high-speed optical signals, extract the characteristic parameters and train them with artificial neural network, and finally perform optical modulation format with artificial neural network. [0004] 2. Modulation format identification based on principal component analysis: Asynchronous delay sampling is performed on high-speed optical signals, the characteristic values ​​of the signals are extracted by principal component analysis method, and a weight vector comparison library is made. The modulation format...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/079
CPCH04B10/0795
Inventor 杨彦甫张红玉姚勇
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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