Title :
Multiquantum-well lasers with tapered active stripe for direct coupling to single-mode fiber
Author :
Inaba, Y. ; Kito, M. ; Nishikawa, T. ; Ishino, M. ; Matsui, Y.
Author_Institution :
Semicond. Res. Center, Matsushita Electr. Ind. Co. Ltd., Osaka, Japan
fDate :
6/1/1997 12:00:00 AM
Abstract :
We demonstrate narrow beam divergence in 1.3-μm wavelength multiquantum-well (MQW) lasers with an active stripe horizontally tapered over the whole cavity, for direct coupling to single mode-fibers. The lasers have reduced output beam divergence in a simple structure which does not contain an additional spot-size transformer. The fabricated laser shows narrow beam divergence of /spl sim/12/spl deg/, while a low-threshold current of 6.9 mA and a high efficiency of 0.62 mW/mA are realized. Furthermore, a direct-coupling efficiency to a single-mode fiber is -4.0-dB and -3-dB alignment tolerance is /spl plusmn/2.5 μm.
Keywords :
laser beams; laser cavity resonators; optical fibre couplers; quantum well lasers; waveguide lasers; 1.3 mum; 6.9 mA; InGaAsP-InP; MQW laser; alignment tolerance; direct coupling; direct-coupling efficiency; high efficiency; horizontally tapered active stripe; low-threshold current; multiquantum-well lasers; narrow beam divergence; output beam divergence; simple structure; single-mode fiber; spot-size transformer; tapered active stripe; whole cavity; Fiber lasers; Laser beams; Laser modes; Optical coupling; Optical fiber communication; Optical fiber devices; Optical waveguides; Quantum well devices; Semiconductor lasers; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
