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Optical modulation method including providing at least one optical device configured for modulating at least one optical electromagnetic wave provided to and transmitted through the at least one optical device, providing the at least one optical signal electromagnetic wave from at least one first light source to the at least one optical device, the at least one optical signal electromagnetic wave having at least one operation wavelength to be modulated by the at least one optical device; providing a photo-excitation electromagnetic wave from the at least one first light source or from at least one second optical source to the at least one optical device at a pump light intensity to displace in wavelength the resonance wavelengths and the resonance dips in the transmission spectrum to optically modulate the transmitted intensity of the at least one optical signal electromagnetic wave at the at least one operation wavelength.