• Chinese Optics Letters
  • Vol. 22, Issue 12, 120601 (2024)
Xu Zhang1,2, Ming Luo1,2,*, Tao Zeng1, Ziqing Liu1..., Yingmei Pan1, Zhixue He2, Xi Xiao1,2,3 and Hanbing Li1|Show fewer author(s)
Author Affiliations
  • 1State Key Laboratory of Optical Communication Technologies and Networks, China Information Communication Technologies Group Corporation, Wuhan 430074, China
  • 2Peng Cheng Laboratory, Shenzhen 518000, China
  • 3National Information Optoelectronics Innovation Centre, Wuhan 430074, China
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    DOI: 10.3788/COL202422.120601 Cite this Article Set citation alerts
    Xu Zhang, Ming Luo, Tao Zeng, Ziqing Liu, Yingmei Pan, Zhixue He, Xi Xiao, Hanbing Li, "Multiplier-simplified adaptive channel equalization for short-reach coherent optical transmission," Chin. Opt. Lett. 22, 120601 (2024) Copy Citation Text show less

    Abstract

    A multiplier-simplified adaptive channel equalization scheme is proposed for short-reach digital coherent optical transmission. The data processing is based on hardware-efficient logic, such as a shifter and adder unit, rather than a conventional multiplier. Through the offline experiment, the performances of 64 Gbaud polarization division multiplexed (PDM) quadrature phase shift keying (QPSK), 16-quadrature amplitude modulation (16QAM), and 64-quadrature amplitude modulation (64QAM) are verified. Typically, in 10.8 km standard single-mode fiber transmission, the 64 Gbaud PDM-16QAM performance penalty can be limited to less than 0.2 dB by the proposed adaptive channel equalization, compared with the conventional method. Furthermore, based on our 10 Gb/s real-time coherent optical transceiver, we demonstrate the feasibility of a field-programmable gate array. Using a reasonable number of logical units, the performance of the proposed scheme is shown to be close to that of the conventional method.
    Eoutx=i=1nFxx(i)Einx(i)+i=1nFyx(i)Einy(i),

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    Eouty=i=1nFxy(i)Einx(i)+i=1nFyy(i)Einy(i),

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    Fxx=Fxx+4μεxEoutx[Einx]*,

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    Fyx=Fyx+4μεxEoutx[Einy]*,

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    Fxy=Fxy+4μεyEouty[Einx]*,

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    Fyy=Fyy+4μεyEouty[Einy]*,

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    Dout=Sign(F)·i=1M[Fi·(Dini)],

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    Xu Zhang, Ming Luo, Tao Zeng, Ziqing Liu, Yingmei Pan, Zhixue He, Xi Xiao, Hanbing Li, "Multiplier-simplified adaptive channel equalization for short-reach coherent optical transmission," Chin. Opt. Lett. 22, 120601 (2024)
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