Using downstream DPSK and upstream wavelength-shifted ASK for Rayleigh backscattering mitigation in TDM-PON to WDM-PON migration scheme

Chi Wai Chow*, C. H. Yeh

*Corresponding author for this work

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

A migration scheme from time-division-multiplex passive optical network (TDM-PON) to wavelength-division-multiplex PON (WDM-PON) using differential phase-shift keying (DPSK) for the downstream signal and wavelength-shifted amplitude-shift keying (WS-ASK) for the upstream signal is demonstrated. The migration scheme does not change the existing fiber infrastructure. An optical filter is preinstalled at the optical networking unit (ONU) to select the desirable downstream wavelength for the WDM-PON and simultaneously demodulate the downstream DPSK signal. Signal remodulation is used to generate the upstream signal by reusing the downstream wavelength. In the ONU, by wavelength shifting the upstream optical spectrum with respect to the downstream optical spectrum, the Rayleigh backscattering (RB) interference beat noise affecting the upstream signal can be significantly mitigated. The optimum bandwidth for the downstream DPSK demodulation is analyzed. The downstream and upstream transmission performances at different split ratios are also discussed.

Original languageEnglish
Article number6472294
JournalIEEE Photonics Journal
Volume5
Issue number2
DOIs
StatePublished - 18 Mar 2013

Keywords

  • Optical communications
  • differential phase-shift keying (DPSK)
  • noise mitigation
  • wavelength-division-multiplex passive optical network (WDM-PON)

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