Patent ID: 7813654

Claim:
An optical feedforward apparatus comprising: a first optical detector emitting a first detected signal; a first optical coupler, coupling a modulated optical signal with the first optical detector, the modulated optical signal being indicative of a radio frequency input; a first subtractor, receiving the first detected signal and the radio frequency input, the first subtractor emitting an error signal; a transversal equalizer, receiving the error signal and emitting an equalized error signal; an optical linearizer, receiving the equalized error signal and emitting an optical correction signal; a second optical coupler, coupling the modulated optical signal with the optical correction signal, to output a linearized optical signal; a second subtractor having first input coupled to the radio frequency input and having an output for adjusting tap coefficients of the transversal equalizer; and a third optical coupler coupling a portion of the modulated optical signal and the optical correction signal to a second optical detector, an output of the second optical detector being applied to a second input of the second subtractor.