Title :
Coherent homodyne detection of BPSK signals using time-gated amplification and LiNbO3 optical 90° hybrid
Author :
Cho, Pak S. ; Harston, Geof ; Kerr, Chris J. ; Greenblatt, A.S. ; Kaplan, Arkady ; Achiam, Yaakov ; Shpantzer, Isaac
Author_Institution :
CeLight Inc., Silver Spring, MD, USA
fDate :
7/1/2004 12:00:00 AM
Abstract :
We have investigated and compared the performance of coherent detection of 12.5-Gb/s nonreturn-to-zero and return-to-zero binary phase-shift keying (BPSK) signals using LiNbO3 optical 90° hybrid with pulsed and continuous-wave local laser oscillator (LO). Our results showed that pulsed local oscillator provides at least 2-dB reduction in optical signal-to-noise ratio requirement. Increased eye opening and reduced bit-error ratio of the detected BPSK signal was observed using pulsed local oscillator. Pulsed local oscillator also provides pulse-shaping capability that reduces signal pulse-broadening penalty. Our simulation results agreed well with experiment and predicted that for a given signal and receiver bandwidth there is an optimal LO pulsewidth which gives maximum eye opening.
Keywords :
homodyne detection; lithium compounds; optical pulse shaping; phase shift keying; BPSK signals; LiNbO3; binary phase-shift keying; bit-error ratio; continuous-wave local laser oscillator; eye opening; homodyne detection; pulse shaping; pulsed local laser oscillator; signal pulse-broadening reduction; time-gated amplification; Binary phase shift keying; Local oscillators; Optical pulses; Optical receivers; Phase detection; Phase shift keying; Pulse amplifiers; Signal detection; Signal to noise ratio; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.828462
