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Coupling Factor - an overview | ScienceDirect Topics Zhao, Amnon Yariv, in Semiconductor Lasers I, 1999. 1.6.3 Amplitude-phase coupling and spectral linewidth. The amplitude-phase coupling factor α (or linewidth enhancement factor) of a semiconductor laser determines its spectral linewidth at steady state and the wavelength chirping under high-speed modulation. A reduction in α will lead to a reduction in spectral linewidth and wavelength ...

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