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A three-segment laser, when separately pumped, shows both frequency switching and continuous tuning with a modulation current applied to the middle segment. The wavelength changes are attributed to gain peak shift with the carrier concentration and carrier-induced index change. A total wavelength change of 61 Å, a continuous tuning range of 4.1 Å, and a tuning rate of −0.74 Å/mA are obtained. The laser may be useful in optical FM fiber communication.
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Fang et al. (1984) studied this question.
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