System and Method for Monitoring and Control of an Optical Modulator for an M-QAM Transmitter

A system, comprising:

• a photo detector operable to generate an intensity signal corresponding to an output signal generated by an optical IQ-modulator;
• a filter operable to generate a filtered intensity signal based on the intensity signal generated by the photo detector;
• an RF power meter operable to generate an RF power signal corresponding to the filtered intensity signal generated by the filter;
• and
• a processor operable to:
• receive the RF power signal;
• determine, based on a minimization algorithm and the received RF power signal, a first bias voltage to be applied to a first sub-modulator of the optical IQ-modulator and a second bias voltage to be applied to a second sub-modulator of the optical IQ-modulator.

A system, comprising:

• a peak power meter operable to generate a peak power signal corresponding to the peak power of an output signal generated by an optical IQ-modulator;
• and
• a processor operable to:
• receive the peak power signal;
• determine, based on a minimization algorithm and the received peak power signal, a bias voltage to be applied to a phase shift component of the optical IQ-modulator.

A method, comprising:

• generating an intensity signal corresponding to an output signal generated by an optical IQ-modulator;
• filtering the intensity signal to generate a filtered intensity signal;
• generating an RF power signal corresponding to the filtered intensity signal;
• determining, based on a minimization algorithm and the RF power signal, a first bias voltage to be applied to a first sub-modulator of the optical IQ-modulator and a second bias voltage to be applied to a second sub-modulator of the optical IQ-modulator.