With increased injection current both low- and high-frequency intensity fluctuations shift toward higher frequencies. A comparison between the experimental results for an InGaAsP laser diode and a small-signal analysis of the laser rate equations shows that both types of frequency fluctuations can be interpreted as complex relaxation oscillations of a laser diode with external feedback. The simple model describes reasonably well the frequency shift and the spectral width of the fluctuations observed.>
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Port et al. (1990) studied this question.
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