Phase recovery for QPSK transmission without using complex multipliers

  • Authors:

  • Xinmiao Zhang;Jea Hack Lee;Myung Hoon Sunwoo

  • Affiliations:

  • Case Western Reserve University, Cleveland, Ohio;Ajou University, Wonchun-Dong, Yeungtong-Gu, Suwon, Korea;Ajou University, Wonchun-Dong, Yeungtong-Gu, Suwon, Korea

  • Venue:
  • Proceedings of the 6th International Conference on Ubiquitous Information Management and Communication
  • Year:
  • 2012

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Abstract

This paper proposes a high-speed and low-complexity phase recovery algorithm for 10Gb/s dual-polarization quadrature phase shift keying (DP-QPSK) optical communications. The Viterbi and Viterbi (V&V) algorithm is commonly used for phase noise recovery. However, it performs data dependency elimination by using complex multipliers, which have large silicon area and long critical path. Hence, the V&V algorithm is not suitable for extremely high-speed phase recovery. To achieve high speed and low complexity, we propose a novel algorithm for data dependency elimination. The proposed scheme only needs simple logic, and does not require complex multiplications. As a result, it can achieve significant hardware complexity reduction and higher clock rate compared with the V&V algorithm.