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Future Internet 2018, 10(7), 59; https://doi.org/10.3390/fi10070059

Clock Recovery Challenges in DSP-Based Coherent Single-Mode and Multi-Mode Optical Systems

DTU Fotonik, Technical University of Denmark, Ørsteds Plads 343, 2800 Kongens Lyngby, Denmark
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Received: 10 May 2018 / Revised: 18 June 2018 / Accepted: 24 June 2018 / Published: 26 June 2018
(This article belongs to the Special Issue Recent Advances in DSP-Based Optical Communications)
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Abstract

We present an analysis of clock recovery algorithms in both polarization division multiplexing systems and mode division multiplexing systems. The impact of inter-polarization time skew and polarization mode dispersion in single-mode fibers, as well as the combined impact of mode mixing and mode group delay spread in multi-mode fibers under different coupling regimes are investigated. Results show that although the clock tone vanishing has a known solution for single-mode systems, in multi-mode systems even for low group delay spread, strong coupling will cause clock tone extinction, making it harder to implement an effective clock recovery scheme. View Full-Text
Keywords: optical communications; clock recovery; space-division multiplexing; coherent communications optical communications; clock recovery; space-division multiplexing; coherent communications
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Diniz, J.C.M.; Da Ros, F.; Zibar, D. Clock Recovery Challenges in DSP-Based Coherent Single-Mode and Multi-Mode Optical Systems. Future Internet 2018, 10, 59.

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