Patent ID: 6487004
Filing Date: 2002-11-26
Classification: G02F,H03D,H04B

Abstract:
An all-optical image reject downconverter comprised of:an optical light source providing optical light; a first optical path wherein the optical light is transferred into a first optical sideband frequency by an optical modulator; a second optical path wherein the optical light is transferred into a second predetermined sideband frequency by a second optical modulator; said second modulated optical light being further modulated by a predetermined radio frequency signal in a third optical modulator producing an output signal containing many optical wavelengths; said optical signal containing many optical wavelengths is passed through a narrow tunable optical filter to filter out all signals except a predetermined sideband frequency; and means for recombining the first path and second path optical signals whereupon the filtered optical signal is heterodyned with the modulated optical signal from the first optical path to produce downconverted intermediate frequency optical signal without unwanted image signals and an unwanted sideband; and said downconverted intermediate optical signal being transmitted over an optical fiber circuit to remotely located user electronics.