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

Volume

2

fYear

1995

fDate

24-27 Jul 1995

Firstpage

577

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/SBMOMO.1995.509682

Filename

509682