An efficient modulation technique for suppressing intrachannel FWM in 40Gb/s optical transmission systems

Hussam G. Batshon, Ivan B. Djordjevic, Bane Vasic

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In high bit-rate retum-to-zero (RZ) on-off keying (OOK) systems operating at 40Gb/s and beyond ghost pulses induced by intrachannel four-wave mixing (IFWM), and intrachannel cross-phase modulation (IXPM) are dominant factors affecting the performance of a high-speed optical transmission system. As the creation of ghost pulses is a phase sensitive effect, the common approach to deal with IFWM is to remove short-term phase coherence by employing a proper modulation format. Another approach, known as constrained or line coding, is to identify the most troublesome sequences and to forbid them during encoding process. This paper presents an efficient method for testing the efficiency of a modulation techniques for countering the effects of IFWM by calculating the sum of all the contributors at a given resonance position. For a modulation technique to counter these effects the initial pulses phases must be chosen properly so that different contributors to the ghost pulse creation cancel each other in bit being in "resonance". In addition to this method, we are proposing a modulation technique that shows a significant Q-factor improvement of up to 7.5dB (depending on the number of spans and the phase sequence implemented) over the uncoded RZ-OOK as will be demonstrated. Finally, implementation of this phase modulation technique is very efficient in extending the non-linearity tolerance and enhancing the performance of a high-speed optical transmission system.

Original languageEnglish (US)
Title of host publicationOptical Transmission Systems and Equipment for Networking V
DOIs
StatePublished - Nov 28 2006
EventOptical Transmission Systems and Equipment for Networking V - Boston, MA, United States
Duration: Oct 2 2006Oct 4 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6388
ISSN (Print)0277-786X

Other

OtherOptical Transmission Systems and Equipment for Networking V
CountryUnited States
CityBoston, MA
Period10/2/0610/4/06

Keywords

  • Constrained coding
  • Intrachannel cross-phase modulation
  • Intrachannel four-wave mixing
  • Low-density parity-check (LDPC) codes
  • Optical communications

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'An efficient modulation technique for suppressing intrachannel FWM in 40Gb/s optical transmission systems'. Together they form a unique fingerprint.

  • Cite this

    Batshon, H. G., Djordjevic, I. B., & Vasic, B. (2006). An efficient modulation technique for suppressing intrachannel FWM in 40Gb/s optical transmission systems. In Optical Transmission Systems and Equipment for Networking V [63880H] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6388). https://doi.org/10.1117/12.686435