Open AccessAll-optical modulation format conversion from NRZ-OOK to RZ-QPSK using parallel SOA-MZI OOK/BPSK converters
Author(s) -
Ken Mishina,
Suresh M. Nissanka,
Akihiro Maruta,
Seiji Mitani,
K. Ishida,
K. Shimizu,
Tatsuo Hatta,
Kenichi Kitayama
Publication year - 2007
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.15.007774
Subject(s) - phase shift keying , keying , bit error rate , modulation (music) , physics , quadrature amplitude modulation , optics , on off keying , amplitude shift keying , electronic engineering , computer science , telecommunications , engineering , acoustics , channel (broadcasting)
A novel all-optical modulation format conversion from non-return-to-zero on-off-keying (NRZ-OOK) to return-to-zero quadrature-phase-shift-keying (RZ-QPSK) is proposed and experimentally demonstrated. The proposed format conversion scheme is based on parallel Mach-Zehnder interferometric (MZI) OOK/binary-PSK (BPSK) converters, consisting of integrated semiconductor optical amplifiers (SOAs). We experimentally demonstrate that in both decoded channels of the converted RZ-QPSK signal bit error rate (BER) curves show almost the same receiver sensitivity at a symbol-rate of 10.7 Gsymbol/s. In addition, a reasonable dispersion tolerance of the converted signal up to +295 ps/nm is observed. The numerical simulation based upon carrier rate equation verifies the experimental results.