Patent ID: 7574143

Claim:
A device for processing of an optical input signal, which optical input signal comprises at least a first data signal, said device comprising: a first optical resonator to provide a reference signal by optical filtering of said optical input signal, said first optical resonator being matched with a predetermined reference wavelength of said first data signal, a second optical resonator to provide a sideband signal by optical filtering of said optical input signal, said second optical resonator being non-matched with said predetermined reference wavelength of said first data signal, and an optical combiner to combine said sideband signal with said reference signal to form an optical output signal, wherein said device is configured: to couple said first data signal to a first side of said first optical resonator, to couple said reference signal out of a second side of said first optical resonator, to couple said first data signal to a first side of said second optical resonator, and to couple said sideband signal out of a second side of said second optical resonator.