System and method for reducing mutual leakage between distributed feedback laser and electro-absorption modulator in integrated electro-absorption modulated laser

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,
• wherein the second light signal is based on the first light signal, the information signal, the dither tone signal and the second filtered signal, said second filter comprising at least one of a second phase adjusting portion, a second amplitude adjusting portion or a second filtering portion, the second phase adjusting portion operable to adjust the phase of the dither tone signal, the second amplitude adjusting portion operable to adjust the amplitude of the dither tone signal, and the second filtering portion operable to pass the dither tone signal and attenuate other signals.

A method of using a dither tone signal and an information signal, said method comprising:

• outputting, via a laser diode, a first light signal;
• transmitting, via an electro-optic modulator, a second light signal;
• generating, via a first filter, a first filtered signal based on the information signal;
• and
• generating, via a second filter, 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 adjusting portion, a first amplitude adjusting portion or a first filtering portion, the first phase adjusting 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.

A method of using a dither tone signal and an information signal, said method comprising:

• outputting, via a laser diode, a first light signal;
• transmitting, via an electro-optic modulator, a second light signal;
• generating, via a first filter, a first filtered signal based on the information signal;
• and
• generating, via a second filter, 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,
• wherein the second light signal is based on the first light signal, the information signal, the dither tone signal and the second filtered signal, said second filter comprising at least one of a second phase adjusting portion, a second amplitude adjusting portion or a second filtering portion, the second phase adjusting portion operable to adjust a phase of the dither tone signal, the second amplitude adjusting portion operable to adjust an amplitude of the dither tone signal, and the second filtering portion operable to pass the dither tone signal and attenuate other signals.