モードコンバータを集積した狭幅ストライプレーザ

概要

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We examine the use of selective MOVPE of InGaAsP for the fabrication of lasers with an integrated mode converter. Using such converter the divergence of the laser beam can be reduced, facilitating the laser/fiber coupling. Here we describe the use of a very narrow width active layer in the laser/converter structure. This reduces the beam divergence and improves the beam symmetry, which should have a beneficial influence on the coupling loss in a cleaved fiber. The threshold current is expected to decrease too due to the higher current densities. With this structure a circular output beam was obtained with the narrowest farfield pattern ever. The fabrication method is very simple compared to previously reported mode converter structures as all growth is done by MOVPE and no semiconductor etching is involved.
社団法人電子情報通信学会の論文
1995-09-05