Title :
Linewidth reduction of DSM lasers due to effects of composite cavity and distributed reflectors
Author :
Kudo, Koji ; Arai, Shigehisa ; Shim, Jong In
Author_Institution :
Dept. of Phys. Electron., Tokyo Inst. of Technol., Japan
fDate :
6/1/1993 12:00:00 AM
Abstract :
Spectral properties of dynamic single-mode (DSM) lasers are theoretically analyzed in terms of the effects of composite cavity and distributed reflectors. Unique reduction mechanisms of adiabatic chirp and linewidth are found in distributed reflector (DR) lasers and complex-coupled (CC) (i.e., gain+index-coupled) DSM lasers, which are explained from the viewpoints of modal phase and modal gain behaviours. For CC-DSM lasers, it is shown that the arrangement of index and gain corrugation, namely, antiphase or in-phase combination, will suppress or enhance, respectively, an effective linewidth enhancement factor, αeff. Numerical results show that DR structures are much superior in spectral and single-mode properties to distributed-feedback (DFB) and distributed-Bragg-reflector (DBR) structures
Keywords :
laser cavity resonators; laser modes; semiconductor lasers; spectral line breadth; adiabatic chirp; complex coupled lasers; composite cavity; distributed reflectors; dynamic single mode lasers; effective linewidth enhancement factor; gain corrugation; in-phase combination; index corrugation; modal gain behaviours; modal phase; spectral properties; Charge carrier density; Chirp modulation; Distributed Bragg reflectors; Fluctuations; Laser modes; Laser theory; Optical coupling; Optical materials; Reflectivity; Waveguide lasers;
Journal_Title :
Quantum Electronics, IEEE Journal of
