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

Júlio César Medeiros Diniz, Francesco Da Ros and Darko Zibar
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Júlio César Medeiros Diniz: DTU Fotonik, Technical University of Denmark, Ørsteds Plads 343, 2800 Kongens Lyngby, Denmark
Francesco Da Ros: DTU Fotonik, Technical University of Denmark, Ørsteds Plads 343, 2800 Kongens Lyngby, Denmark
Darko Zibar: DTU Fotonik, Technical University of Denmark, Ørsteds Plads 343, 2800 Kongens Lyngby, Denmark

Future Internet, 2018, vol. 10, issue 7, 1-14

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.

Keywords: optical communications; clock recovery; space-division multiplexing; coherent communications (search for similar items in EconPapers)
JEL-codes: O3 (search for similar items in EconPapers)
Date: 2018
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