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Method for identifying modulation format of optical communication signal with differential phase amplitude ratio

A signal modulation format and differential phase technology, applied in the field of modulation identification, can solve the problems of high complexity and high OSNR requirements

Active Publication Date: 2019-02-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the technical defects of high complexity and high OSNR requirements in the existing optical communication signal modulation format identification method, and propose a differential phase amplitude ratio optical communication signal modulation format identification method

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  • Method for identifying modulation format of optical communication signal with differential phase amplitude ratio
  • Method for identifying modulation format of optical communication signal with differential phase amplitude ratio
  • Method for identifying modulation format of optical communication signal with differential phase amplitude ratio

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Embodiment 1

[0049] This embodiment describes the specific implementation of a method for identifying the modulation format of an optical communication signal using a differential phase-amplitude ratio according to the present invention.

[0050] figure 1 It is a system block diagram and connection relationship based on a differential phase-amplitude ratio optical communication signal modulation format identification method of the present invention; figure 2 System design for specific implementation.

[0051] exist figure 2 Among them, at the transmitting end, the continuous wave laser, that is, the CW Laser is replaced by the IQ modulator, that is,

[0052]IQMod, modulation; in the IQ modulator, the I-channel and Q-channel signals are modulated by two random bit sequences generated by an arbitrary waveform generator; the emitted laser signal is 1550nm, and the line width is 5kHz.

[0053] The IQ modulator generates three modulated signals of QPSK, 16QAM and 64QAM at a baud rate of 10...

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Abstract

The invention relates to a method for identifying a modulation format of an optical communication signal with a differential phase amplitude ratio, and belongs to the technical field of modulation recognition. The method comprises the following steps: step A, performing coherent detection, front end equalization, dispersion compensation, clock recovery, and carrier frequency offset compensation onan input optical communication signal to be detected; step B, calculating AAR and DPDR in an MFI module; step C, calculating a modulation format identification factor R; step D, performing optical signal modulation format identification on the output of the step A; step E, performing adaptive equalization according to optical signal modulation format; step F, performing carrier phase recovery; and step G, performing decision and decoding. The method can identify the optical signal modulation format when the OSNR is not less than 12dB with no need of carrier recovery and no need of a large amount of training data sets and complex calculations, and can identify three modulation modes including QPSK, 16QAM and 64QAM when the input signal OSNR is not less than 12dB.

Description

technical field [0001] The invention relates to a method for identifying the modulation format of an optical communication signal with a differential phase-amplitude ratio, and belongs to the technical field of modulation identification. Background technique [0002] In order to meet the growing demand for global IP service capacity, optical networks are developing from traditional fixed networks to flexible and adaptive elastic optical network architectures. Research has shown that the multi-ary amplitude-phase joint modulation (MQAM) format can transmit signals with variable bit rates by changing M3 through hardware configuration. For elastic optical networks with flexible switching of multiple modulation formats, the optical receiver needs to have the ability of adaptive blind recognition of different modulation formats, so as to provide support for subsequent digital signal processing of the receiver, such as carrier phase noise estimation and frequency offset compensati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04B10/61
CPCH04B10/612H04B10/6161H04B10/6164H04L27/0012
Inventor 杨爱英郭芃谭庆照
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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