Open AccessPhase-and-amplitude regeneration of differential phase-shift keyed signals using a phase-sensitive amplifier
Author(s) -
Kevin Croussore,
Inwoong Kim,
Cheol-Hwan Kim,
Yan Han,
Guifang Li
Publication year - 2006
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.14.002085
Subject(s) - optics , phase (matter) , brillouin scattering , differential phase , amplifier , signal (programming language) , amplitude , signal regeneration , phase modulation , phase noise , physics , optical amplifier , materials science , optical fiber , optoelectronics , laser , computer science , cmos , quantum mechanics , programming language
DPSK phase-and-amplitude regeneration with a NOLM-based phase-sensitive amplifier is demonstrated experimentally. For a highly degraded input signal, maximum differential phase errors were reduced from 82 degrees to 41 degrees , while the SNR was improved by more than 5-dB. Differential phase Q-factor improvement was better than 6-dB. The PSA was operated free of excess noise due to stimulated Brillouin scattering by using a binary phase modulated pulse train as the pump. The impact of pump fluctuations on regeneration performance is clarified. The regenerated signal was characterized by measurement of the constellation diagram by linear optical sampling, giving the first directly measured evidence of DPSK phase regeneration.