Patent ID: 6441932
Filing Date: 2002-08-27
Classification: H04B

Abstract:
A narrowband optical noise cancellation system comprising:a continuous wave optical laser that generates an optical carrier signal which has a modulating period; an RF source of a radio frequency modulating signal; a modulator that outputs a first and second optical modulated signal by splitting the optical carrier signal into a first and second carrier signal and modulating them with the radio frequency modulating signal; a means for delaying the first optical modulated signal by an odd multiple of 180 degrees of the modulating period to output a delayed first optical modulated signal at a first power level; an optical attenuator that adjusts the second optical modulated signal so that it has a second power level that equals the first power level of the delayed first optical modulated signal; a means for combining the second optical modulated signal from the optical attenuator with the delayed first optical modulated signal from the delaying means to output thereby an output modulated optical signal; and a means for converting the output modulated optical signal into a modulated electrical signal.