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  • Received: Mar. 18, 2020

    Accepted: May. 25, 2020

    Posted: Jul. 30, 2020

    Published Online: Jul. 31, 2020

    The Author Email: Shaowen Lu (lushaowen@siom.ac.cn), Xia Hou (hou_xia@siom.ac.cn)

    DOI: 10.3788/COL202018.090602

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    Shaowen Lu, Yu Zhou, Funan Zhu, Jianfeng Sun, Yan Yang, Ren Zhu, Shengnan Hu, Xiaoxi Zhang, Xiaolei Zhu, Xia Hou, Weibiao Chen. Digital-analog hybrid optical phase-lock loop for optical quadrature phase-shift keying[J]. Chinese Optics Letters, 2020, 18(9): 090602

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Chinese Optics Letters, Vol. 18, Issue 9, 090602 (2020)

Digital-analog hybrid optical phase-lock loop for optical quadrature phase-shift keying

Shaowen Lu1,2,3,*, Yu Zhou1, Funan Zhu2,3, Jianfeng Sun1,2, Yan Yang3, Ren Zhu3, Shengnan Hu3, Xiaoxi Zhang3, Xiaolei Zhu1,2, Xia Hou2,3,**, and Weibiao Chen1,2

Author Affiliations

  • 1Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Laboratory of Space Laser Engineering, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

Abstract

We analyze a feasible high-sensitivity homodyne coherent optical receiver for demodulating optical quadrature phase-shift keying (QPSK). A fourth-power phase-lock loop based on a digital look-up table is used. Considering the non-negligible loop delay, we optimize the loop natural frequency. Without error correction coding, a sensitivity of ?37 dBm/?35 dBm is achieved, while the bit error rate is below 10?9 at 2.5 Gbaud/5 Gbaud rate. For the QPSK communication system, the bit rate is twice the baud rate. The loop natural frequency is 0.647 Mrad/s, and the minimized steady-state phase-error standard deviation is 3.83°.

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