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Proceedings Paper

Digital signal processing approaches for semiconductor phase noise tolerant coherent transmission systems
Author(s): Miguel Iglesias Olmedo; Xiaodan Pang; Richard Schatz; Darko Zibar; Idelfonso Tafur Monroy; Gunnar Jacobsen; Sergei Popov
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Paper Abstract

We discuss about digital signal processing approaches that can enable coherent links based on semiconductor lasers. A state-of-the art analysis on different carrier-phase recovery (CPR) techniques is presented. We show that these techniques are based on the assumption of lorentzian linewidth, which does not hold for monolithically integrated semiconductor lasers. We investigate the impact of such lineshape on both 3 and 20 dB linewidth and experimentally conduct a systematic study for 56-GBaud DP-QPSK and 28-GBaud DP-16QAM systems using a decision directed phase look loop algorithm. We show how carrier induced frequency noise has no impact on linewidth but a significant impact on system performance; which rises the question on whether 3-dB linewidth should be used as performance estimator for semiconductor lasers.

Paper Details

Date Published: 7 February 2015
PDF: 7 pages
Proc. SPIE 9388, Optical Metro Networks and Short-Haul Systems VII, 93880A (7 February 2015); doi: 10.1117/12.2078408
Show Author Affiliations
Miguel Iglesias Olmedo, KTH Royal Institute of Technology (Sweden)
Technical Univ. of Denmark (Denmark)
Xiaodan Pang, Acreo Swedish ICT AB (Sweden)
Richard Schatz, KTH Royal Institute of Technology (Sweden)
Darko Zibar, Technical Univ. of Denmark (Denmark)
Idelfonso Tafur Monroy, Technical Univ. of Denmark (Denmark)
Gunnar Jacobsen, KTH Royal Institute of Technology (Sweden)
Acreo Swedish ICT AB (Sweden)
Sergei Popov, KTH Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 9388:
Optical Metro Networks and Short-Haul Systems VII
Atul K. Srivastava; Benjamin B. Dingel; Achyut K. Dutta, Editor(s)

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