All optical up-conversion system
View Patent ↗An optical system for providing all-optical up-conversion of a baseband signal including an all-optical up-converter responsive to baseband signals to provide corresponding dual sideband signals about a suppressed optical carrier, said dual sideband signals each having the same polarization direction, being phase locked, having the same optical power and having a fixed frequency spacing; and an optical filter for filtering the carrier signals and providing wavelength division multiplexed signals without optical carriers. In a preferred embodiment, the all-optical up-converter includes an intensity modulator for generating two pump lightwaves that are carrier suppressed in response to the intensity modulator receiving a laser light source and being driven by an RF signal, wherein the intensity modulator is DC biased at a null point, an optical combiner for combining the baseband signal and the two pump lightwaves, a nonlinear medium for four wave mixing the baseband signal and two pump lightwaves to generate the baseband signal and corresponding dual sideband signals, and an optical interleaver for removing the baseband signal and two pump lightwaves to provide said sideband signals about the suppressed optical carrier.
1. An optical system for providing all-optical up-conversion of baseband signal comprising:
an all-optical up-converter responsive to baseband signals to provide corresponding dual sideband signals about a suppressed optical carrier, said dual sideband signals each having the same polarization direction, being phase locked, having the same optical power and having a fixed frequency spacing; and
an optical filter for filtering the carrier signals and providing wavelength division multiplexed signals without optical carriers;
wherein the all-optical up-converter comprises:
an intensity modulator for generating two pump lightwaves that correspond to a carrier suppressed in response to the intensity modulator receiving a laser light source and being driven by an RF signal;
an optical combiner for combining the baseband signal and the two pump lightwaves; and
a nonlinear medium for four wave mixing the baseband signal and two pump lightwaves to generate the baseband signal and corresponding dual sideband signals.
2. The optical system of claim 1 , wherein the intensity modulator is DC biased at a null point.
3. The optical system of claim 1 , wherein the all-optical converter comprises an optical interleaver for removing the baseband signal and two pump lightwaves to provide said sideband signals about the suppressed optical carrier.
4. The optical system of claim 1 , wherein the optical filter comprises one of a tunable optical filter, an optical interleaver and an arrayed waveguide grating.
5. The optical system of claim 1 , wherein the optical combiner comprises one of an optical coupler, wavelength division multiplexed filter, arrayed waveguide grating AWG, and optical interleaver.
6. The optical system of claim 1 , wherein the nonlinear medium comprises one of a nonlinear optical fiber, a semiconductor amplifier and nonlinear optical medium.