Proposed enhancement of side-mode suppression ratio in /spl lambda//4 shifted distributed feedback lasers with nonuniform diffused quantum wells

Author

Yu, S.F. ; Li, E. Herbert

Author_Institution

Dept. of Electr. & Electron. Eng., Hong Kong Univ., Hong Kong

Volume

8

Issue

4

fYear

1996

fDate

4/1/1996 12:00:00 AM

Firstpage

482

Lastpage

484

Abstract

An enhancement of the side mode suppression ratio, by utilizing interdiffused quantum wells, of a /spl lambda//4 shifted distributed feedback laser is demonstrated theoretically. It is found that by introducing a diffusion step along the longitudinal direction of the quantum-well active region, the suppression ratio can be improved significantly for large /spl kappa/L (>2.6) devices. The maximum power for single longitudinal mode operation is increased by more than 50 mW.

Keywords

chemical interdiffusion; distributed feedback lasers; laser modes; laser theory; quantum well lasers; refractive index; /spl lambda//4 shifted distributed feedback lasers; 50 mW; AlGaAs-GaAs; interdiffused quantum wells; longitudinal direction; maximum power; nonuniform diffused quantum wells; quantum-well active region; side-mode suppression ratio; single longitudinal mode operation; suppression ratio; Distributed feedback devices; Laser feedback; Laser modes; Laser stability; Laser transitions; Optical feedback; Optical materials; Optical refraction; Quantum well lasers; Refractive index;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.491090

Filename

491090