Patent ID: 6907052
Filing Date: 2005-06-14
Classification: H04B

Abstract:
1. A tunable optical local oscillator for providing an optical local oscillator signal, the tunable optical local oscillator comprising, a laser for providing an optical carrier having a carrier frequency, a Mach-Zehnder modulator for providing a double sideband signal having first wavelength signal at a first frequency and a second wavelength signal at a second frequency, an asymmetric means for asymmetric filtering of the double sideband signal for increasing the intensity of the first wavelength signal over the second wavelength signal for providing power asymmetry between the first wavelength signal and the second wavelength signal, and a laser ring for providing a backward traveling wave and a forward traveling wave of the first wavelength signal for feeding back the first wavelength signal, the backscattering serving to cancel the first wave length signal for passing the second wavelength signal as the optical local oscillator signal.