Open AccessAll-optical DQPSK signal regeneration using 2R amplitude regenerators
Author(s) -
Masayuki Matsumoto
Publication year - 2009
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.000010
Subject(s) - phase shift keying , signal regeneration , optics , phase modulation , phase noise , amplitude shift keying , noise (video) , phase (matter) , signal (programming language) , physics , modulation (music) , pulse amplitude modulation , amplitude , optical fiber , pulse (music) , telecommunications , computer science , bit error rate , decoding methods , acoustics , detector , programming language , quantum mechanics , artificial intelligence , image (mathematics)
An all-optical regeneration scheme for DQPSK signals is proposed and analyzed. In the regenerator, an incoming DQPSK signal is demodulated to two parallel OOK signals by one-symbol delay interferometers. After the amplitude noise is removed by 2R (reamplifying and reshaping) regenerators and the power levels are suitably amplified, the OOK signals modulate the phase of clocked probe pulses in the subsequent all-optical phase modulators by which the noise-reduced (D)QPSK signal is generated. The alteration of phase data encoded on the pulses in the regeneration process can be undone by suitable encoding or decoding. Numerical simulation for short-pulse RZ-DQPSK signals at 160 Gbit/s (80 Gsymbol/s) shows that reduction in both phase and amplitude noise can be obtained by the regeneration scheme where fiber-based 2R amplitude regenerators and phase modulators using self- and cross-phase modulation, respectively, are employed.