Details about MZM Analytical

[R D SOUMITRA]

The operation of the MZM is described by the equation shown below
Eout (t) = Ein(t).cos(∆θ(t)).exp(j.∆φ(t))
where the difference in phase between the two branches is given as :
∆θ(t) = π
2 .(0.5 − ER.(Modulation(t) − 0.5)).
The parameter ∆φ is the signal phase change described by the
following equation:
∆φ(t) = SC .∆θ(t).(1 + SF )/(1 − SF )
where SC = -1 if the negative signal chirp is true and is = +1 if the
chirp is false, SF represents the Symmetry Factor and Modulation(t)
stands for the incoming electrical signal that has a normalized value
lying between 0 and 1.
These equations are given in the component help of MZM Analytical in Optisystem. Can someone please explain the significance and meaning of the terms
Modulation(t), SC and Symmetry Factor in the given equations.

[Ahmad Atieh]

Hello,
The modulation(t) is the electrical signal that is carried on the optical carrier (laser). The SF is the symmetry factor that defines the location of modulation on the modulator transfer function. While, SC defines if the modulation occurs on the increasing or decreasing side of the modulation transfer function. You may check Figure 1 of the datasheet of the Dual Port MZ Modulator Measured component for better visualization of these terms, although the parameters are defined differently!
Regards,
Ahmad

[Author]

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