A 1.5 μm-wavelength dynamic-single-mode laser with highlow reflection grating structure aiming at high output and one-directional output operation has been obtained for the first time using a selective etching process and low-pressure MOVPE regrowth. A front/rear output power ratio exceeding 50 and side-mode suppression ratio (SMSR) greater than 39dB were obtained at 1.3 times the threshold.
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Aoki et al. (1989) studied this question.
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