Patent ID: 8509626

Claim:
A device for use with a dither tone signal and an information signal, said device comprising: a laser diode operable to output a first light signal; an electro-optic modulator operable to transmit a second light signal; a first filter operable to generate a first filtered signal based on the information signal; and a second filter operable to generate a second filtered signal based on the dither tone signal, wherein the first light signal is based on the dither tone signal, the information signal and the first filtered signal, said first filter comprising at least one of a first phase adiusting portion, a first amplitude adiusting portion or a first filtering portion, the first phase adiusting portion operable to adjust a phase of the information signal, the first amplitude adjusting portion operable to adjust an amplitude of the information signal, and the first filtering portion operable to pass the information signal and attenuate other signals, and wherein the second light signal is based on the first light signal, the information signal, the dither tone signal and the second filtered signal.