Patent ID: 8620158

Claim:
A communications device comprising: a transmitter device comprising first and second optical sources configured to generate first and second optical carrier signals at respective different first and second optical wavelengths, a first optical coupler coupled to said first and second optical sources, and a first modulator coupled to said first optical coupler and configured to modulate a combined carrier signal comprising the first and second optical carrier signals with a radio frequency (RF) input signal; an optical waveguide coupled to said transmitter device; and a receiver device coupled to said optical waveguide and comprising a second modulator configured to further modulate the modulated combined carrier signal with a local oscillator (LO) signal, a frequency modulation-phase modulation (FM-PM) discriminator coupled to said second modulator and configured to convert the modulated combined carrier signal to an intensity modulated combined carrier signal based upon the LO signal, a second optical coupler coupled to said FM-PM discriminator and configured to generate first and second intensity modulated carrier signals, and an optical-to-electrical converter coupled to said second optical coupler and configured to generate an intermediate frequency (IF) signal based upon the first and second intensity modulated carrier signals.