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Frequency-modulation characteristics of semiconductor lasers: deviation from theoretical prediction by rate equation analysis

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3 Author(s)
Kikuchi, K. ; University of Tokyo, Department of Electronic Engineering, Tokyo, Japan ; Fukushima, T. ; Okoshi, T.

The frequency modulation characteristics of 1.3 ¿m InGaAsP DFB BH lasers are measured when the bias current is slightly modulated by a sinusoidal waveform. Two deviations from the prediction by the rate equations are observed. One is that the phase difference between the frequency deviation and the modulation current approaches 180° below the relaxation resonance, and the other is that the ratio of the frequency modulation index to the amplitude modulation index has a strong frequency dependence. Both of the results are well explained by the two-section model, in which the inhomogeneous distribution of the spectral width enhancement factor ¿ is assumed.

Published in:

Electronics Letters  (Volume:22 ,  Issue: 14 )

Date of Publication:

July 3 1986

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