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Multiquantum-well lasers with tapered active stripe for direct coupling to single-mode fiber

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5 Author(s)
Inaba, Y. ; Semicond. Res. Center, Matsushita Electr. Ind. Co. Ltd., Osaka, Japan ; Kito, M. ; Nishikawa, T. ; Ishino, M.
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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.

Published in:

Photonics Technology Letters, IEEE  (Volume:9 ,  Issue: 6 )