A Modulation Format Identification Method for Optical Communication Signals Based on Amplitude Deviation Analysis
A modulation format and optical communication technology, applied in the field of modulation recognition, can solve high complexity problems
Active Publication Date: 2021-09-14
汤文宇 +1
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[0005] The purpose of the present invention is to overcome the existing optical communication signal modulation format identification method that requires additional hardware and high complexity technical defects, and proposes an optical communication signal modulation format identification method based on amplitude deviation analysis
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Embodiment 1
[0039] This embodiment describes the specific implementation of an optical communication signal modulation format identification method based on amplitude deviation analysis according to the present invention.
[0040] figure 1 It is a system block diagram based on an optical communication signal modulation format identification method based on amplitude deviation analysis in the present invention.
[0041] Among them, during specific implementation, the steps are as follows:
[0042] Step 1) The optical communication signal to be identified outputted through the optical fiber link is input into the coherent receiver;
[0043] Among them, the optical fiber link mainly includes standard single-mode fiber, erbium-doped fiber amplifier A and 3dB coupler; the local oscillator laser is regulated by the erbium-doped fiber amplifier and variable optical attenuator;
[0044] The modulation format of the optical communication signal to be identified is one of QPSK, 16QAM and 64QAM; ...
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The invention relates to an optical communication signal modulation format identification method based on amplitude deviation analysis, and belongs to the technical field of modulation identification. The optical communication signal and the local oscillator signal to be identified are input into the coherent receiver for coherent demodulation to output the analog baseband signal, the analog baseband signal is converted into a digital signal for dispersion equalization, and then the amplitude deviation is analyzed, and finally the modulation format is identified, specifically: Calculated separately The average deviation value of the normalized amplitude distribution of the received optical signal and the normalized amplitude distribution of the ideal QPSK and 16QAM signal, calculate the ratio of the two deviation values, and then compare the ratio of the normalized amplitude deviation value of the received optical signal to identify QPSK , 16QAM and 64QAM which one. The method is insensitive to the phase noise caused by the line width of the laser and the frequency offset between the transmitter laser and the local oscillator laser, and can tolerate the nonlinearity of the optical fiber; it does not require training data or additional hardware, and is simple to implement and low in cost.
Description
technical field [0001] The invention relates to an optical communication signal modulation format identification method based on amplitude deviation analysis, and belongs to the technical field of modulation identification. Background technique [0002] Modulation format identification is very important for future optical network development. The next-generation optical fiber communication network should be elastically and flexibly configured, and it will be able to dynamically generate data signals with different modulation formats, data rates, and error correction protocols according to network operation requirements. Therefore, in the heterogeneous elastic optical network, the digital coherent receiver can adaptively blindly identify the modulation format of the optical signal has attracted much attention, which will provide the necessary modulation format information for subsequent digital signal processing. [0003] In recent years, some modulation format identificatio...
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IPC IPC(8): H04B10/516H04B10/548H04B10/556H04L27/34
CPCH04B10/516H04B10/548H04B10/5561H04L27/34
Inventor 汤文宇杨爱英
Owner 汤文宇