Basic relation between input optical fields of MZM is given by
Eo(t)=Ei(t)[exp(jP1(t)+exp(jP2(t)]/2; ———–>(1); assuming equal power splitting through both the waveguides.
where,
P1(t)=pi*Vmod1(t)/Vpi————>(2); P2(t)=pi*Vmod2(t)/Vpi———–>(3)
where P1(t) and P2(t) are phase shifts in upper and lower arms resp. And Vmod1(t) and Vmod2(t) are applied drive voltages in the upper and the lower arms.
now the relation of DC bias voltage
Vmod1(t)= Vm1(t) + Vdc
Vomd2(t)= Vm2(t) + Vdc
Vmod1(t) and Vmod2(t) are the input RF voltages.
May be this helps you
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