Wide-range and fast-convergence frequency offset estimator by BER-aiding for optical coherent receivers

Zhiyu Li; Xue Chen; Weiqin Zhou; Hai Zhu; Xian Zhou; Zhiguo Zhang

doi:10.1117/12.851471

1 December 2009 Wide-range and fast-convergence frequency offset estimator by BER-aiding for optical coherent receivers

Zhiyu Li, Xue Chen, Weiqin Zhou, Hai Zhu, Xian Zhou, Zhiguo Zhang

Proceedings Volume 7632, Optical Transmission Systems, Switching, and Subsystems VII; 763219 (2009) https://doi.org/10.1117/12.851471
Event: Asia Communications and Photonics, 2009, Shanghai, Shanghai , China

Abstract

Optical coherent detection with digital signal processing (DSP) attracts more and more interests owing to its high performance. Due to a free-running local oscillator (LO) on the receiver, a frequency offset (FO) to the optical carrier brings phase distortion with which data can not be correctly decided and decoded. All-digital feed-forward FO estimation algorithms for optical (D)QPSK coherent receivers, such as PADE, have advantages of low complexity and stable-running wide range of estimation. However, it only converges under the condition that the initialed FO is near enough to the real FO while possible FO with typical tunable lasers can be very large. In order to solve this problem, we present a novel FO estimation scheme by BER aiding. This scheme has been demonstrated to be accurate and effective to break the restriction of PADE by simulation.

Citation Download Citation

Zhiyu Li, Xue Chen, Weiqin Zhou, Hai Zhu, Xian Zhou, and Zhiguo Zhang "Wide-range and fast-convergence frequency offset estimator by BER-aiding for optical coherent receivers", Proc. SPIE 7632, Optical Transmission Systems, Switching, and Subsystems VII, 763219 (1 December 2009); https://doi.org/10.1117/12.851471

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