Transmitter skew tolerance and spectral efficiency tradeoff in high baud-rate QAM optical communication systems | Zendy

Yang Yue | Zendy; Qiang Wang | Zendy; Jon Anderson | Zendy

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Transmitter skew tolerance and spectral efficiency tradeoff in high baud-rate QAM optical communication systems

Author(s) -

Yang Yue,

Qiang Wang,

Jon Anderson

Publication year - 2018

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.26.015045

Subject(s) - baud , quadrature amplitude modulation , qam , skew , spectral efficiency , optics , pulse shaping , computer science , residual , wavelength division multiplexing , transmitter , bandwidth (computing) , electronic engineering , optical communication , physics , telecommunications , bit error rate , channel (broadcasting) , engineering , transmission (telecommunications) , laser , algorithm , wavelength

Residual IQ skew in a coherent transmitter severely degrades the performance of long-haul coherent optical communication systems. The impairment is particularly detrimental for a high baud-rate system using quadrature amplitude modulation (QAM). Furthermore, Nyquist pulse shaping increases the spectral efficiency for WDM systems. However, sharp roll-off of Nyquist pulse shaping further reduces the tolerance to residual IQ skew. Thus, certain trade-offs between spectral efficiency and roll-off factor should be made to improve the tolerance of residual IQ skew. We experimentally studied this trade-off and determined the optimal roll-off factor, channel spacing, receiver bandwidth, and equalizer length. The results serve as a guideline for high baud-rate coherent WDM systems.

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