Single-mode operation and linewidth reduction of a GRECC multimode semiconductor laser

Author

Chan, Y.F. ; Cormack, G.D.

Author_Institution

Alberta Telecommun. Res. Center, Edmonton, Alta., Canada

fYear

1988

Firstpage

119

Lastpage

121

Abstract

A technique is presented for easily converging a multimode semiconductor laser to a single-mode operation by utilizing a far-end coated GRIN-ROD lens to provide simultaneously side-mode suppression, linewidth reduction, a collimated beam from one side of the configuration, and a usable beam from the other facet of the laser. Side-mode suppression (SMS) of at least 22 dB was achieved. The linewidth of the laser was reduced from 90 MHz to 8.5 MHz with a10%-reflectivity lens and to 4 MHz with a 40%-reflectivity lens at 1.7 I_th. A SMS of at least 17 dB was preserved under two separate conditions of high-frequency (450 MHz) and large-signal modulation

Keywords

gradient index optics; lenses; optical modulation; semiconductor junction lasers; 22 dB; 450 MHz; 8.5 MHz; GRECC multimode semiconductor laser; GRIN ROD external coupled cavity; collimated beam; far-end coated GRIN-ROD lens; large-signal modulation; linewidth reduction; sidemode suppression; singlemode operation; Fabry-Perot interferometers; Fiber lasers; Frequency; Laser beams; Laser feedback; Laser modes; Laser noise; Lenses; Reflectivity; Semiconductor lasers;

fLanguage

English

Publisher

ieee

Conference_Titel

WESCANEX 88: 'Digital Communications Conference Proceedings'

Conference_Location

Saskatoon, Sask.

Type

conf

DOI

10.1109/WESCAN.1988.27680

Filename

27680