Patent ID: 8320773

Claim:
A modulated optical system with cross-modulation compensation, the system comprising: a laser including a RF input configured to receive a multichannel RF signal, a bias input configured to receive a bias current, and an optical output configured to provide a modulated optical signal in response to the multichannel RF signal and the bias current, the multichannel RF signal including a superposition of multiple carriers, and wherein at least one of the multiple carriers modulates at least one other of the multiple carriers resulting in cross-modulation; cross-modulation detection circuitry configured to receive the multichannel RF signal and to generate a cross-modulation detection signal responsive to the multichannel RF signal, the cross-modulation detection circuitry comprising a band pass filter configured to filter the cross-modulation detection signal and to generate a filtered cross-modulation detection signal at a target frequency range at which a cross-modulation component occurs; and cross-modulation compensation circuitry configured to modulate the multichannel RF signal provided to the laser in response to the filtered cross-modulation compensation signal such that compensating cross-modulation is imparted to the multichannel RF signal to compensate for the cross-modulation component at the target frequency range.