Title :
NRZ-OOK-to-RZ-BPSK modulation-format conversion using SOA-MZI wavelength converter
Author :
Mishina, Ken ; Maruta, Akihiro ; Mitani, Shunsuke ; Miyahara, Toshiharu ; Ishida, Kazuyuki ; Shimizu, Katsuhiro ; Hatta, Tatsuo ; Motoshima, Kuniaki ; Kitayama, Ken-ichi
Author_Institution :
Dept. of Electron. & Inf. Eng., Osaka Univ., Suita
Abstract :
A novel all-optical modulation-format conversion from nonreturn-to-zero on-off keying (NRZ-OOK) to return-to-zero binary phase-shift keying (RZ-BPSK) is proposed. A Mach-Zehnder interferometric (MZI) wavelength converter consisting of integrated semiconductor optical amplifiers (SOAs) is utilized to implement the proposed format conversion. Error-free operation at a bit rate of 10.7 Gb/s is experimentally demonstrated in order to show the feasibility of the proposed scheme. The received sensitivity of the converted signal is improved by 2.9 dB compared with a back-to-back NRZ-OOK signal at BER=10 -9. In addition, a reasonable dispersion tolerance of the converted signal up to plusmn500 ps/nm is observed. The numerical simulation based upon the carrier-rate equation verifies the experimental results
Keywords :
Mach-Zehnder interferometers; amplitude shift keying; error statistics; optical communication equipment; optical fibre communication; optical modulation; optical wavelength conversion; phase shift keying; semiconductor optical amplifiers; 10.7 Gbit/s; BER; Mach-Zehnder interferometer; NRZ-OOK; RZ-BPSK; SOA-MZI wavelength converter; carrier-rate equation; dispersion tolerance; modulation-format conversion; nonreturn-to-zero on-off keying; return-to-zero binary phase-shift keying; semiconductor optical amplifiers; Bit rate; Error-free operation; Numerical simulation; Optical interferometry; Optical wavelength conversion; Phase modulation; Phase shift keying; Phase shifting interferometry; Semiconductor optical amplifiers; Wavelength conversion; Modulation-format conversion; on–off keying (OOK); optical-fiber communication; phase-shift keying (PSK); semiconductor optical amplifier (SOA);
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2006.882255
