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Proceedings Paper

Digital timing recovery combined with adaptive equalization for optical coherent receivers
Author(s): Xian Zhou; Xue Chen; Weiqing Zhou; Yangyang Fan; Hai Zhu; Zhiyu Li
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Paper 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.

Paper Details

Date Published: 25 November 2009
PDF: 6 pages
Proc. SPIE 7632, Optical Transmission Systems, Switching, and Subsystems VII, 76320I (25 November 2009); doi: 10.1117/12.851544
Show Author Affiliations
Xian Zhou, Beijing Univ. of Posts and Telecommunications (China)
Xue Chen, Beijing Univ. of Posts and Telecommunications (China)
Weiqing Zhou, Beijing Univ. of Posts and Telecommunications (China)
Yangyang Fan, Beijing Univ. of Posts and Telecommunications (China)
Hai Zhu, Beijing Univ. of Posts and Telecommunications (China)
Zhiyu Li, Beijing Univ. of Posts and Telecommunications (China)


Published in SPIE Proceedings Vol. 7632:
Optical Transmission Systems, Switching, and Subsystems VII
Dominique Chiaroni, Editor(s)

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