An improved multiplier-free feed-forward carrier phase estimation for dual-polarization QPSK modulation format

Abstract

An improved multiplier-free feed-forward carrier phase estimation algorithm is proposed for dual-polarization quadrature-phase-shift-keying (DP-QPSK) with coherent detection. The bit error rate (BER) performance, block length effect and linewidth tolerance of the proposed algorithm are evaluated for a 112 Gbit/s DP-QPSK system. A linewidth symbol duration product of 2.9×10⁻⁴ is demonstrated for 1 dB optical signal-to-noise-ratio (OSNR) penalty at BER of 10⁻³ for the proposed algorithm. The hardware complexity of the proposed multiplier-free algorithm is demonstrated to be much lower than that of the 4th power algorithm.

Keywords

Phase Noise / Carrier Phase / Block Length / Amplify Spontaneous Emission / Hardware Complexity

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