Reduced effective differential gain in diode lasers due to confinement factor modulation

A reduced effective differential gain is shown to arise in diode lasers by including the modulation of the confinement factor with carrier density. This effective differential gain, not the material gain, is the parameter determined from conventional measurements of the differential gain. This term is in addition to the static reduction in confinement factor with carrier density, and can significantly reduce the resonance frequency and modulation bandwidth for lasers with short cavities and thin active layers.<
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