Title :
A simple method for the chirp reduction in single-frequency semiconductor lasers
Author :
Koslinski, M.E.C. ; Conrado, L.F.M. ; Carvalho, Maria C R
Author_Institution :
CETUC, Pontificia Univ. Catolica do Rio de Janeiro, Brazil
Abstract :
The direct current modulation of single-longitudinal mode semiconductor lasers causes a dynamic shift of the peak emission wavelength (chirping) arising from gain-induced variations of the laser refractive index. This linewidth broadening results in data-dependent distortion in long-haul, high-bit-rate, direct detection optical communication systems due to interaction with the generally nonzero chromatic dispersion of monomode fibers. Here it is shown that the frequency chirping of 1.55 μm DFB lasers and the bit error of the system can be greatly reduced by the use of a delta stub in the microstrip driving circuit of the laser
Keywords :
chirp modulation; distributed feedback lasers; driver circuits; error analysis; fibre lasers; laser beams; laser noise; microstrip circuits; optical fibre communication; optical fibre dispersion; optical modulation; optical transmitters; semiconductor lasers; spectral line broadening; 1.55 mum; bit error; chirp reduction; chromatic dispersion; data-dependent distortion; delta stub; direct current modulation; dynamic shift; frequency chirping; gain-induced variations; laser refractive index; linewidth broadening; long-haul high-bit-rate direct detection optical communication systems; microstrip driving circuit; monomode fibers; peak emission wavelength; single-frequency semiconductor lasers; Chirp modulation; Chromatic dispersion; Fiber lasers; Laser modes; Laser noise; Optical detectors; Optical distortion; Optical fiber communication; Refractive index; Semiconductor lasers;
Conference_Titel :
Microwave and Optoelectronics Conference, 1995. Proceedings., 1995 SBMO/IEEE MTT-S International
Conference_Location :
Rio de Janeiro
Print_ISBN :
0-7803-2674-1
DOI :
10.1109/SBMOMO.1995.509682
