We present the remarkable tunability of the output spectrum of an Optically Injected Semiconductor Laser under an input signal, in the form of a periodic pulse train, modulating the current. Conditions for discrete output spectra, in the form of frequency combs, are determined. The characteristics of the output frequency combs in terms of the number, the distance and the amplitude of the spectral lines, are shown to be controlled by the parameters of the input periodic pulse signal, namely the pulse amplitude, duration and period, suggesting a multi-functional device for a variety of applications.
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