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Volume 40 Issue 1
Nov.  2015
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Effect of relative phase noise on performance of coherent optical communication systems

  • Received Date: 2014-09-15
    Accepted Date: 2014-10-22
  • In a coherent optical orthogonal frequency-division multiplexing transmission system with forward-pumped Raman amplification, the interplay between Raman pump relative intensity noise and cross-phase modulation leads to relative phase noise inducing non-negligible performance degradation. In order to solve this problem, by numerical analysis, theoretical analysis and experimental verification, effect of relative phase noise on the performance of a coherent optical communication system under different modulation formats was analyzed. The performance of a single-carrier orthogonal frequency division multiplexed system under the same conditions was compared with that of a multi-carrier system. The extent of system damage caused by relative phase noise was gotten. The results show that the relatively larger walk-off between pump and signal helps to suppress the impairment induced by the relative phase noise. A higher-order modulated signal is less tolerant to relative phase noise than a lower-order signal. With the same spectral efficiency, the quadrature-amplitude modulation format shows better tolerance to relative phase noise than phase-shift keying.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Effect of relative phase noise on performance of coherent optical communication systems

  • 1. School of Telecommunication Engineering, Beijing Polytechnic, Beijing 100029, China

Abstract: In a coherent optical orthogonal frequency-division multiplexing transmission system with forward-pumped Raman amplification, the interplay between Raman pump relative intensity noise and cross-phase modulation leads to relative phase noise inducing non-negligible performance degradation. In order to solve this problem, by numerical analysis, theoretical analysis and experimental verification, effect of relative phase noise on the performance of a coherent optical communication system under different modulation formats was analyzed. The performance of a single-carrier orthogonal frequency division multiplexed system under the same conditions was compared with that of a multi-carrier system. The extent of system damage caused by relative phase noise was gotten. The results show that the relatively larger walk-off between pump and signal helps to suppress the impairment induced by the relative phase noise. A higher-order modulated signal is less tolerant to relative phase noise than a lower-order signal. With the same spectral efficiency, the quadrature-amplitude modulation format shows better tolerance to relative phase noise than phase-shift keying.

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