NRZ-DPSK to RZ-BPSK all-optical format conversion using optical filter and SOA-MZI

Y. Yu, X. Zhang, J. B. Rosas-Fernández, D. Huang, R. V. Penty, I. H. White

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding

2 Citations (SciVal)


We propose and demonstrate all-optical format conversion from nonreturn-to-zero differential phase-shift-keying (NRZ-DPSK) to return-to-zero binary PSK (RZ-BPSK) at different bit-rates, using a tunable band-pass filter, a semiconductor optical amplifier (SOA) fiber ring laser and an SOA based Mach-Zehnder interferometer (SOA-MZI). The filter acts as the DPSK demodulator and also as the differential decoder. It converts the NRZ-DPSK into the RZ signals, which is equivalent to the data information before differential encoding. The SOA fiber ring laser is used to recover the clock signals from the demodulated RZ signals at different bit-rates. In the subsequent SOA-MZI, the RZ signal is used to modulate the recovered clock signal which is synchronous to the demodulated RZ signal. Thus, the amplitude information is encoded onto the phase of the clock signal, through cross gain modulation (XGM) and cross phase modulation (XPM) effects in the SOA-MZI. The converter can be operated at flexible bit-rates and used as the interface between long-haul WDM and OTDM systems.

Original languageEnglish
Title of host publicationOptical Transmission, Switching and Subsystems VI
Place of PublicationU. S. A.
Publication statusPublished - 11 Nov 2008
EventOptical Transmission, Switching, and Subsystems VI - Hangzhou, China
Duration: 27 Oct 200830 Oct 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering


ConferenceOptical Transmission, Switching, and Subsystems VI


  • Format conversion
  • Nonreturn-to-zero differential phase-shift-keying (NRZ-DPSK)
  • Optical filter
  • Return-to-zero binary phase-shift-keying (RZ-BPSK)
  • Semiconductor optical amplifier Mach-Zehnder interferometer (SOA-MZI)

ASJC Scopus subject areas

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


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