Amplitude modulation of single-frequency injection laser radiation by a harmonic current signal

The radiation emitted by a GaAs homojunction laser, emitting a single frequency of 50 mW power when the threshold was exceeded significantly, was modulated directly by a sinusoidal current of frequency in the range 0.2–1000 MHz. The dependences of the optical and rf output signal spectra on the frequency and depth of modulation were investigated.