A method for real-time monitoring and correction of frequency offset cycle slip in optical communication system

An optical communication system and real-time monitoring technology, applied in the field of optical communication, can solve the problems of frequency offset cycle jump, increase system error code, etc., and achieve the effect of reducing error code

Active Publication Date: 2020-03-20
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

However, in the case of a large system frequency offset, AKF using a larger Q value in the fast read tracking phase will cause frequency offset cycle slips, thereby increasing the bit error of the system

Method used

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  • A method for real-time monitoring and correction of frequency offset cycle slip in optical communication system
  • A method for real-time monitoring and correction of frequency offset cycle slip in optical communication system
  • A method for real-time monitoring and correction of frequency offset cycle slip in optical communication system

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the description of the drawings and specific embodiments.

[0032] A method for real-time monitoring and correction of frequency deviation cycle slips in an optical communication system. First, assuming that the received signal has undergone perfect clock recovery, depolarization and channel equalization, it is expressed mathematically as:

[0033]

[0034] Among them, r n Represents the nth received signal, m n represents the nth transmitted signal, T s Represents the interval between adjacent symbols, f represents the system frequency offset, represents the system phase noise, w n represents the white Gaussian noise of the system;

[0035] Secondly, the signal with only frequency offset and phase noise left is tracked and recovered by the MAKF algorithm. In the MAKF algorithm, the signal is first estimated by EKF for frequency offset and phase, and the relationship between the recovered ...

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Abstract

The invention provides a method for monitoring and correcting frequency offset cycle slip in a communication system in real time. The method comprises the following steps of: firstly, assuming that a received signal is subjected to perfect clock recovery, de-biasing and channel equalization; secondly, subjecting the signals just with frequency offset and phase noise to a MAKF algorithm for tracking and recovery, wherein in the MAKF algorithm, the signal is firstly subjected to frequency offset and phase estimation by EKF, the minimum decision error dz of the recovery signal and the ideal constellation point is calculated by a direct decision method, and the minimum decision error dz goes into a lock detection module. The method can simultaneously processes the frequency offset and the phase noise damage of a coherent optical communication system, and ensures the tracking speed and the precision of the algorithm by different tuning parameters Q in different tracking phases. A frequency offset cycle slip real-time monitoring and recovery module monitors the frequency offset value estimated by AKF in real time and corrects the frequency offset of cycle slip so as to minimize error codes.

Description

technical field [0001] The invention relates to optical communication, in particular to a method for real-time monitoring and correction of frequency offset cycle slip in an optical communication system. Background technique [0002] With the rapid development of technologies such as cloud computing, big data, and 5G, people have increasing requirements for communication capacity and speed, and coherent optical communication technology with advantages such as high speed and large capacity is a key technology to meet this demand . However, with the improvement of the signal modulation format order and the continuous growth of the transmission bit rate, laser phase noise and carrier frequency deviation (the frequency deviation between the local oscillator light and the signal light) have become important factors that limit this development. Aiming at the above damages, there are various algorithms to estimate and compensate. However, they have their own limitations. [0003...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/61
CPCH04B10/6164H04B10/6165
Inventor 杨彦甫向前
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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