Title :
Spectral linewidth reduction in semiconductor lasers by an external cavity with weak optical feedback
Author :
Patzak, E. ; Olesen, Henning ; Sugimura, Akira ; Saito, Sakuyoshi ; Mukai, Toshiharu
Author_Institution :
NTT, Musashino Electrical Communication Laboratory, Musashino, Japan
Abstract :
The linewidth narrowing of a semiconductor laser due to weak optical feedback is analysed, taking into account both phase condition and threshold change for the feedback-induced modes. The achievable linewidth reduction lies in between two limiting cases, 1/(1 + X ¿(1 + ¿2))2 and 1/(1 + X)2, where ¿ and X are the linewidth enhancement factor and the feedback parameter, respectively.
Keywords :
feedback; laser cavity resonators; semiconductor junction lasers; spectral line breadth; external cavity; feedback-induced modes; linewidth narrowing; phase condition; semiconductor lasers; spectral linewidth reduction; threshold change; weak optical feedback;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19830640
