Phase noise influence in long-range coherent optical OFDM systems with delay detection, IFFT multiplexing and FFT demodulation

Gunnar Jacobsen*, Tianhua Xu, Sergei Popov, Sergey Sergeyev, Yimo Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We present a study of the influence of dispersion induced phase noise for CO-OFDM systems using FFT multiplexing/IFFT demultiplexing techniques (software based). The software based system provides a method for a rigorous evaluation of the phase noise variance caused by Common Phase Error (CPE) and Inter-Carrier Interference (ICI) including - for the first time to our knowledge - in explicit form the effect of equalization enhanced phase noise (EEPN). This, in turns, leads to an analytic BER specification. Numerical results focus on a CO-OFDM system with 10-25 GS/s QPSK channel modulation. A worst case constellation configuration is identified for the phase noise influence and the resulting BER is compared to the BER of a conventional single channel QPSK system with the same capacity as the CO-OFDM implementation. Results are evaluated as a function of transmission distance. For both types of systems, the phase noise variance increases significantly with increasing transmission distance. For a total capacity of 400 (1000) Gbit/s, the transmission distance to have the BER < 10-2 for the worst case CO-OFDM design is less than 800 and 460 km, respectively, whereas for a single channel QPSK system it is less than 1400 and 560 km.

Original languageEnglish
Pages (from-to)289-295
Number of pages7
JournalJournal of Optical Communications
Volume33
Issue number4
DOIs
Publication statusPublished - Dec 2012

Bibliographical note

©[2012] by Walter de Gruyter Berlin Boston. Volume 33, Issue 4, Pages 289–295, ISSN (Online) 2191-6322, ISSN (Print) 0173-4911, DOI: https://doi.org/10.1515/joc-2012-0047

Keywords

  • coherent systems
  • orthogonal frequency division multiplexed systems
  • phase noise
  • RF pilot carrier

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