Dual parallel mach-zehnder-modulator device with pre-distorted driving voltages

A method of operating a dual parallel Mach-Zehnder-modulator (DPMZM) comprising first and second inner MZMs arranged parallel to each other, said method comprising the following steps performed by at least one electronic component:

• receiving an in-phase component yI and a quadrature component yQ of a desired base-band signal,
• calculating first and second driving voltages VI, VQ such as to
• determine said first and second driving voltages VI, VQ each as a function of both of said in-phase and quadrature components yI, yQ of said desired base-band signal in view of anticipated I-Q cross-talk to mitigated the anticipated I-Q cross-talk such that said driving voltages VI, VQ will produce approximately said desired in-phase and quadrature components yI, yQ in the optical signal modulated by said DPMZM when the driving voltages are applied to the DPMZM,
• applying said first driving voltage VI to the first inner MZM for generating an in-phase component EI of an optical signal and applying said second driving voltage VQ to the second inner MZM for generating a quadrature component EQ of said optical signal.