IRZ-Manchester coding for downstream signal modulation in an ONU-source-free WDM-PON

Yang Lu, Xuezhi Hong, Jie Liu, Lei Xu, Changjian Guo, Sailing He

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Inverted return-to-zero (IRZ)-Manchester coding is proposed for optical downstream signal using amplitude shift keying (ASK) modulation in an optical network unit (ONU)-source-free wavelength-divisionmultiplexing passive optical network (WDM-PON), and ASK modulation is used for the optical upstream signal generation using remodulation over the optical downstream signal. With IRZ-Manchester coding, differential phase shift keying (DPSK) modulation can be overlaid on the downstream optical ASK signal for broadcasting services. Our experimental results show that the IRZ-Manchester coded optical ASK downstream signal has no modulation extinction ratio restrictions from the overlaid DPSK modulation, and that the remodulated optical upstream signal has very limited signal crosstalk from the downstream signals. In comparison with the conventional schemes using only Manchester coding or IRZ modulation, the proposed IRZ-Manchester coded modulation scheme shows better performance under different PON upstream and downstream traffic bit rate ratios.

Original languageEnglish (US)
Pages (from-to)1218-1222
Number of pages5
JournalOptics Communications
Issue number5
StatePublished - Mar 1 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


  • Inverse return to zero (IRZ)code
  • Manchester code
  • WDM-PON Remodulation


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