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Basically, semiconductor support light modulation(photo voltaic devices) and conductivity modulation(diode,transisitor)
output wavelength of any light signal coming out of semiconductor depends upon its bandgap..in the process of light modulation.so. you try to vary bandgap of the semiconductor which will ultimately vary it's output wavelength ..The basic relationship of a photon's Energy to it's frequency is E=hf where E is the photon's energy in Joules, h is Planck's constant, and f is the photon's frequency.
E=h/λ....h=planck constant...HOPE IT HELPS....
REPLY ME THE OBJECTIONS IF ANY