Title :
Reduction of laser modulation bandwidth requirement in FSK systems using duobinary coding and differential detection
Author :
Prat, J. ; Gené, J.M.
Author_Institution :
Dept. of Signal Theor. & Commun., Univ. Politecnica de Catalunya, Barcelona, Spain
fDate :
5/11/2006 12:00:00 AM
Abstract :
The duobinary signalling concept is applied to direct frequency modulation of a semiconductor laser. The main goal is the achievement of a low-cost high bit-rate transmission with reduced modulation bandwidth requirement of the laser diode. The simulation and experimental work demonstrate a laser modulation bandwidth reduction of about 50%. The system exhibits a high tolerance against fibre nonlinear effects, up to 20 dBm, and phase noise, up to 170 MHz of linewidth at 10 Gbit/s.
Keywords :
binary sequences; differential detection; frequency shift keying; optical fibre communication; optical modulation; telecommunication signalling; FSK systems; differential detection; direct frequency modulation; duobinary coding; duobinary signalling; laser diode; laser modulation bandwidth; semiconductor laser;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20060407
