Abstract: An analog Optical FM Receiver which includes an optical delay for shifting the phase of a received modulated optical carrier signal as a function of the modulating analog signal so that the phase variation between the shifted optical signal and the received frequency modulated carrier signal can be determined and the modulating analog signal can be extracted.

Abstract: An optical FM modulation system includes a continuous wave optical light source for producing an optical carrier wave; integration means, responsive to an FM modulating signal, for generating a phase signal representative of the phase variations corresponding to the frequency variations of the FM modulating signal; and an electro-optic phase modulator, responsive to the electrical signal representative of the phase variations, for shifting the phase of the optical carrier wave to modulate the frequency of the optical carrier wave as a function of the modulating signal.