Digital timing recovery combined with adaptive equalization for optical coherent receivers

Xian Zhou; Xue Chen; Weiqing Zhou; Yangyang Fan; Hai Zhu; Zhiyu Li

doi:10.1117/12.851544

25 November 2009 Digital timing recovery combined with adaptive equalization for optical coherent receivers

Xian Zhou, Xue Chen, Weiqing Zhou, Yangyang Fan, Hai Zhu, Zhiyu Li

Proceedings Volume 7632, Optical Transmission Systems, Switching, and Subsystems VII; 76320I (2009) https://doi.org/10.1117/12.851544
Event: Asia Communications and Photonics, 2009, Shanghai, Shanghai , China

Abstract

We propose a novel equalization and timing recovery scheme, which adds an adaptive butterfly-structured equalizer in an all-digital timing recovery loop, for polarization multiplexing (POLMUX) coherent receivers. It resolves an incompatible problem that digital equalizer requires the timing recovered (synchronous) signal and Gardner timing-error detection algorithm requires the equalized signal because of its small tolerance on dispersion. This joint module can complete synchronization, equalization and polarization de-multiplexing simultaneously without any extra computational cost. Finally, we demonstrate the good performance of the new scheme in a 112-Gbit/s POLMUX-NRZ-DQPSK digital optical coherent receiver.

Citation Download Citation

Xian Zhou, Xue Chen, Weiqing Zhou, Yangyang Fan, Hai Zhu, and Zhiyu Li "Digital timing recovery combined with adaptive equalization for optical coherent receivers", Proc. SPIE 7632, Optical Transmission Systems, Switching, and Subsystems VII, 76320I (25 November 2009); https://doi.org/10.1117/12.851544

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