Title :
Effect of external optical feedback on spectral properties of external cavity semiconductor lasers
Author :
Dutta, N.K. ; Olsson, N.A. ; Liou, K.-Y.
Author_Institution :
AT&T Bell Laboratories, Murray Hill, USA
Abstract :
The effects of external optical feedback on the spectral properties of single-mode external cavity semiconductor lasers that use a graded-index (GRIN) lens in the optical cavity have been investigated. Mode rejection ratio and intensity drop-out rate of the dominant mode as a function of optical strength have been measured. These measurements show that a laser with a short (160 ¿m) GRIN-lens external cavity can tolerate optical feedback as large as ¿20 dB without significant penalty. This minimum optical feedback can be larger when lasers with shorter cavity length are used.
Keywords :
feedback; laser cavity resonators; laser modes; optical communication equipment; semiconductor junction lasers; dominant mode; external cavity semiconductor lasers; external optical feedback; graded-index lens; intensity drop-out rate; mode rejection ratio; optical communication equipment; optical strength; reflections; single longitudinal mode; spectral properties;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19840406
