Patent ID: 8718489

Claim:
An optical transmitter comprising: a RF signal input configured to provide a RF input signal; a predistortion circuit configured to receive the RF input signal and to generate a predistorted RF input signal, the predistortion circuit comprising a primary signal path configured to receive at least a portion of the RF input signal and a secondary signal path coupled to the primary signal path and configured to receive at least a portion of the input signal, the secondary signal path comprising: at least one distortion generator configured to produce intermodulation distortion products from the RF input signal on the secondary path; and at least one signal controlled phase inverter configured to invert the intermodulation distortion products produced by the distortion generator in response to a phase inversion control signal; a laser configured to receive the predistorted RF input signal and to generate a modulated optical output, wherein the predistorted RF input signal compensates for distortion generated by at least the laser; and a controller coupled to the predistortion circuit and configured to generate the phase inversion control signal.