Title :
The optical gain coupling saturation effect on the linewidth property of complex coupled DFB lasers
Author :
Kudo, Koji ; Arai, Shigehisa ; Shin, K.C.
Author_Institution :
Dept. of Phys. Electron., Tokyo Inst. of Technol., Japan
fDate :
4/1/1994 12:00:00 AM
Abstract :
The cavity length dependence of the linewidth property of complex coupled (CC) DFB lasers is investigated. In CC-DFB lasers with a fixed geometrical structure of the active region, the cavity length strongly affects the ratio of index coupling strength to the gain coupling one, which results in the variation of the effective linewidth enhancement factor /spl alpha//sub eff/. It is also found that pure gain coupled (GC) DFB lasers have the saturation characteristic in the linewidth power product, with the extension of the cavity length, These results indicate the importance of the selection of the cavity length in CC-DFB lasers.<>
Keywords :
distributed feedback lasers; laser cavity resonators; laser theory; optical saturation; semiconductor lasers; spectral line breadth; active region; cavity length; cavity length dependence; complex coupled DFB lasers; effective linewidth enhancement factor; fixed geometrical structure; gain coupling; index coupling strength; linewidth power product; linewidth property; optical gain coupling saturation effect; saturation characteristic; Optical coupling; Optical losses; Optical materials; Optical refraction; Optical saturation; Optical variables control; Power lasers; Reflectivity; Refractive index; Spontaneous emission;
Journal_Title :
Photonics Technology Letters, IEEE
