ADC input to MZM for linear operation

[muhammad saqlain]

Dear all,
My question is what is condition to operate in linear region by tuning it to the quadrature point.one input from Analog to digital (ADC) and other rest conditions would be same for two arm MZM?.Keep it in mind one of the electrical input to the modulator port is pure digitized signal (ADC output).Please comments.please find attached the snapshot for better understanding.

Regards,
Muhammad Saqlain

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