Journal of Guangxi Normal University(Natural Science Edition) ›› 2022, Vol. 40 ›› Issue (2): 71-80.doi: 10.16088/j.issn.1001-6600.2021060803

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Application of Momentum Factor DD-LMS Algorithm in High Speed Coherent Receiver

GONG Chuang1, LIU Zhiqiang1,2, LU Ye1, ZHOU Peng1, WU Kangkang1, LI Chuanqi1,3*   

  1. 1. College of Electronic Engineering, Guangxi Normal University, Guilin Guangxi 541004, China;
    2. The No. 34 Research Institute of CETC, Guilin Guangxi 541004, China;
    3. College of Physics and Electronic, Nanning Normal University, Nanning Guangxi 530001, China
  • Received:2021-06-08 Revised:2021-07-10 Published:2022-05-31

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Abstract: The chromatic dispersion in the optical fiber is the direct cause of the inter-symbol interference (ISI) of the transmission signal, and the signal degradation is particularly serious when the transmission environment fluctuates. Traditional adaptive blind equalization algorithms have slow convergence speed and large errors, which are not suitable for high-speed coherent receivers. In order to solve this problem, the momentum factor is introduced to improve the decision-directed least means square (DD-LMS) algorithm to optimize the effect of fiber channel dispersion. Theoretically, the momentum factor is derived and demonstrated on the convergence performance and error function of the blind equalization algorithm. At the same time, the momentum factor of different functions is explored on the optimization performance of the algorithm.A coherent optical transmission system with a single carrier transmission rate of 224 Gib/s is built on the OptiSystem optical simulation software. The results show that, compared with the traditional time domain equalizer (TDE ), adding this adaptive filter at the back end of the system can reduce the average bit error rate of the system by about 2.5 dB. When the optical signal-to-noise ratio is 15 dB and the transmission distance is 500-1 000 km, the error rate of the dispersion compensation module can be stabilized at about 10-2, and it has strong robustness in the dispersion channel.

Key words: coherent optical receiver, dispersion compensation, blind equalization, DD-LMS algorithm, momentum factor

CLC Number: 

  • TN929.1
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