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Enhanced performance of phase-conjugated OFDM subcarriers using digital coherent superposition

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Abstract

We have recently demonstrated the improved phase noise tolerance in coherent optical OFDM by digital coherent superposition of optical OFDM subcarriers, which are phase-conjugated pairs with Hermitian symmetry. In this approach, we realized DCS of OFDM subcarriers in single polarization (or channel), denoted as SP-DCS-OFDM. In this paper, we show that another approach is in dual polarizations, or DP-DCS-OFDM. According to the concept of phase-conjugated twin wave, both approaches can also mitigate the fiber nonlinearity to the first order. We prove that both approaches can cancel the inter-carrier interference (ICI) due to phase noise to the second order, and we derive the reduced ICI power to the fourth order using the Wiener phase noise model. In simulation, we show the enhanced tolerance to the laser phase noise and fiber nonlinearity.

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Acknowledgments

This work was supported in part by National High Technology Research and Development Program of China (863 Program) (2013AA013403,2015AA010101) and NSFC (Nos. 61420106011, 61405024).

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Authors and Affiliations

  1. State Key Laboratory of Optical Fibre and Cable Manufacture Technology, Yangtze Optical Fibre and Cable Joint Stock Limited Company, Guanshan 2 Rd., Wuhan, 430073, People’s Republic of China

    Hongyan Zhou & Changwei Tang

  2. School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, People’s Republic of China

    Xingwen Yi, Dengke Zeng & Kun Qiu

Authors
  1. Xingwen Yi
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  2. Hongyan Zhou
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  3. Changwei Tang
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  4. Dengke Zeng
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  5. Kun Qiu
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Correspondence to Xingwen Yi.

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Yi, X., Zhou, H., Tang, C. et al. Enhanced performance of phase-conjugated OFDM subcarriers using digital coherent superposition. Photon Netw Commun 31, 321–326 (2016). https://doi.org/10.1007/s11107-015-0522-2

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  • DOI: https://doi.org/10.1007/s11107-015-0522-2

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