Bit-rate variable DPSK demodulation based on cascaded four-wave mixing
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AbstractWe report a demodulator for DPSK signals at variable bit rates based on cascaded four-wave mixing (FWM). The demodulation utilizes two FWM processes in a photonic crystal fiber (PCF) with in-between dispersion in a chirped fiber Bragg grating (CFBG). The first FWM generates a wavelength-tunable idler carrying phase information of the signal. A tunable optical delay between the signal and the idler is then introduced by dispersion. The signal, the idler, and the pump are reflected by the CFBG with a reflectance of 99% back to the PCF to initiate the second FWM process. In the second FWM, the phase relationship between the signal and the one-bit-delayed idler determines an amplification or attenuation of the idler, converting phase modulation to intensity modulation. Error-free demodulations have been successfully demonstrated for both NRZ and RZ-DPSK signals at 5 and 10 Gb/s. © 2011 Optical Society of America.
All Author(s) ListDai Y., Shu C.
Journal nameOptics Express
Year2011
Month2
Day14
Volume Number19
Issue Number4
PublisherOptical Society of America
Place of PublicationUnited States
Pages2952 - 2958
ISSN1094-4087
LanguagesEnglish-United Kingdom

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