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A novel method for estimating the linewidth enhancement factor α of semiconductor lasers has been developed. In this method, the spectrum of the correlation between FM and AM noises is measured in a frequency range where the spontaneous emission noise is dominant, and then the α value is calculated from the measured correlation. The α value of channeled-substrate-planar AlGaAs lasers has been estimated to be 2.2-2.8.
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Kikuchi et al. (1985) studied this question.
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