Title :
Optimization of fiber amplifier SCM lightwave video systems using direct and external modulation
Author :
Alameh, K.E. ; Minasian, Robert A.
Author_Institution :
Sch. of Electr. Eng., Sydney Univ., NSW
fDate :
1/1/1993 12:00:00 AM
Abstract :
An analysis of the design factors involved in optimizing laser transmitters for SCM video distribution networks is presented. This includes optimization of the erbium-doped amplifier, linearized external modulation, and laser overmodulation to increase the optical loss budget. A full nonlinear distortion spectral analysis is employed to determine the dependence of the optimum optical modulation index on the allowable postamplifier loss. A general optimization procedure has been developed for the fiber amplifier and modulator to maximize the postamplifier loss for a specified CNR objective. Results are presented showing a comparison between the distribution capacity of direct and externally modulated SCM-EDFA systems for VSB-AM and FM-SCM transmission systems
Keywords :
amplitude modulation; erbium; fibre lasers; optical communication equipment; optical links; optical losses; optical modulation; optimisation; refractive index; subcarrier multiplexing; video signals; Er-doped fibre amplifier; FM-SCM transmission systems; SCM lightwave video systems; SCM video distribution networks; SCM-EDFA systems; VSB-AM transmission systems; allowable postamplifier loss; design factors; direct modulation; distribution capacity; fiber amplifier; full nonlinear distortion spectral analysis; laser overmodulation; laser transmitters; linearized external modulation; optical loss budget; optimisation; optimum optical modulation index; vestigial sideband; Design optimization; Erbium-doped fiber amplifier; Erbium-doped fiber lasers; Laser noise; Optical design; Optical fiber amplifiers; Optical losses; Optical modulation; Optical transmitters; Semiconductor optical amplifiers;
Journal_Title :
Lightwave Technology, Journal of
