Title :
Coherent demodulation of optical multilevel phase-shift-keying signals using homodyne detection and digital signal processing
Author :
Tsukamoto, Satoshi ; Katoh, Kazuhiro ; Kikuchi, Kazuro
Author_Institution :
Res. Center for Adv. Sci. & Technol., Univ. of Tokyo
fDate :
5/1/2006 12:00:00 AM
Abstract :
We demonstrate coherent demodulation of optical multilevel (M-ary) phase-shift-keying (PSK) signals. Since the carrier phase is estimated accurately through digital signal processing after phase-diversity homodyne detection, the system performance is highly tolerant to the carrier phase noise. By off-line bit-error-rate measurements using distributed feedback semiconductor lasers with linewidths of 150 kHz as a transmitter and a local oscillator, it is shown that binary PSK (M=2), quadrature PSK (M=4), and eight-PSK (M=8) signals are successfully demodulated at the symbol rate of 10 Gsymbol/s
Keywords :
demodulation; distributed feedback lasers; error statistics; homodyne detection; light coherence; measurement by laser beam; optical fibre communication; optical information processing; optical transmitters; phase noise; phase shift keying; semiconductor lasers; spectral line breadth; binary PSK signals; carrier phase; carrier phase noise; coherent demodulation; digital signal processing; distributed feedback lasers; homodyne detection; laser linewidth; local oscillator; off-line bit-error-rate measurements; optical communication systems; optical multilevel signals; phase-diversity homodyne detection; phase-shift-keying signals; quadrature PSK signals; semiconductor lasers; transmitter; Demodulation; Digital signal processing; Distributed feedback devices; Optical feedback; Optical signal processing; Optical transmitters; Phase detection; Phase shift keying; Signal detection; Signal processing; Coherent communications; homodyne receiver; phase modulation; spectral efficiency;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2006.873921
