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Optical digital communication modulation format identification methods based on state transition probability distribution

A technology of modulation format and probability distribution, which is applied in the direction of modulation type identification, digital transmission system, modulation carrier system, etc., can solve the problems of high complexity, and achieve the effect of simple implementation and low cost

Active Publication Date: 2019-03-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[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 digital communication modulation format identification method with state transition probability distribution

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  • Optical digital communication modulation format identification methods based on state transition probability distribution
  • Optical digital communication modulation format identification methods based on state transition probability distribution
  • Optical digital communication modulation format identification methods based on state transition probability distribution

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Embodiment 1

[0039] This embodiment describes the specific implementation of a modulation format identification method for optical digital communication using a state transition probability distribution according to the present invention.

[0040] figure 1 It is a system block diagram based on an optical digital communication modulation format identification method of state transition probability distribution in the present invention.

[0041] Among them, during specific implementation, the steps are as follows:

[0042] Step 1) Input the optical digital communication signal to be identified through the optical fiber link output into the coherent receiver;

[0043] Among them, the optical fiber link mainly includes standard single-mode optical fiber and erbium-doped optical fiber amplifier A;

[0044] Wherein, in the coherent receiver, the optical digital communication signal to be identified is coupled with the local oscillator laser through a 3dB coupler, and the modulation format of t...

Embodiment 2

[0064] This embodiment describes the method for identifying the modulation format of optical digital communication using a state transition probability distribution according to the present invention to identify the modulation format of the optical digital signal transmitted in a single-channel 2000km optical fiber digital communication system. In this embodiment, the line widths of the transmitting laser and the local oscillator laser are both 100 kHz, and the central wavelength of the local oscillator laser is 1554.0 nm, which is the same as that of the optical digital communication signal to be identified. The optical digital signals of QPSK, 16QAM and 64QAM three modulation formats are respectively input into the 2000km optical fiber communication system, the symbol rate is 28Gbaud, the power of each modulation format optical signal entering the optical fiber is 2.0dBm, and the length of each optical fiber span is 100km . After each fiber span, an Erbium-doped fiber amplif...

Embodiment 3

[0067] This embodiment describes the identification of the modulation format of the optical digital signal transmitted in the three-channel 2000km optical fiber digital communication system using a state transition probability distribution optical digital communication modulation format identification method according to the present invention. In this embodiment, the linewidths of the transmitting laser and the local oscillator laser are both 100 kHz, and the wavelengths of the three channels are 1553.6 nm, 1554.0 nm, and 1554.4 nm, respectively. The local oscillator lasers are respectively the same as the central wavelength of the optical digital communication signal of the channel to be identified. The optical digital signals of QPSK, 16QAM and 64QAM three modulation formats are respectively input into the 1000km optical fiber communication system, the symbol rate is 28Gbaud, the power of each modulation format optical signal entering the optical fiber is 3.0dBm, and the leng...

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Abstract

The invention relates to optical digital communication modulation format identification methods based on state transition probability distribution and belongs to the technical field of modulation format identification. Coherent demodulation is carried out on a to-be-identified optical digital communication signal and continuous laser output by a local oscillator laser and an analog baseband signalis output. The analog baseband signal is changed into a digital signal through utilization of an analog-to-digital converter. Dispersion balancing and polarization mode dispersion balancing are carried out on the digital signal, amplitude variation probability distribution of adjacent symbol state transition is computed, and a modulation format is identified according to the probability distribution. Specifically, amplitude variation ratios of the adjacent symbol state transition is computed, the probability distribution of the amplitude variation ratios is computed, and whether the modulation format is QPSK, 16QAM or 64QAM is identified according to difference of the probability distribution. The method is insensitive to phase noises resulting from laser line width and frequency offset between a transmitter laser and the local oscillator laser, nonlinearity of an optical fiber is tolerant, data does not need to be trained, additional hardware is avoided, and the method has the advantages of simple realization and low cost.

Description

technical field [0001] The invention relates to an optical digital communication modulation format identification method based on state transition probability distribution, and belongs to the technical field of modulation format 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 heterogeneous elastic optical networks, digital coherent receivers can adaptively blindly identify the modulation format of optical digital communication signals has attracted much attention, which will provide necessary modulation format information for subsequent digital signal processing. [0003] In recent years, some m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00
CPCH04L27/0012
Inventor 杨元军杨爱英
Owner BEIJING INSTITUTE OF TECHNOLOGYGY