Patent ID: 7079780

Claim:
An optical system comprising: an optical transmitter, said optical transmitter including an optical modulator for modulating an RF input signal onto one or more optical carrier signals defining at least two wavelengths and providing RF modulated optical signals on one or more output ports and transmitting said RF modulated output signals available on said one or more output ports, said optical transmitter including a bias control circuit configured to operate optical modulator so that said at least two wavelength have relatively equal power but opposite slope; an optical receiver for demodulating said multiple RF modulated optical signals and providing multiple RF output signals, said optical receiver including a control circuit having a wavelength division demultiplexer for demultiplexing said RF output signals and generating multiple optical signals at each of said multiple wavelengths, said control circuit also including a multiple photodetectors for converting said multiple optical signals to multiple electrical signals and a summing junction for subtracting said multiple electrical signals to provide an output signal; and an optical link connecting said optical transmitter and said optical receiver, wherein said optical link is in free space.