Fig. 10: Layout of the Mach Zehnder modulator.
From: Giant injection-locking bandwidth of a self-pulsing limit-cycle in an optomechanical cavity
The DC voltage (VDC) sets the quadrature point of the modulator at Vπ/2 so that, if the maximum voltage of the RF modulation signal (Vmax) is small, the output light power (Pout) responds linearly to the RF modulation signal. Notice that the overall voltage applied to the modulator is given by VDC + Vmaxsin(2πfmodt).
