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Applying the previous variable conversion, the transfer function of two cascaded MZI with two unequal path length difference i.e. $\Delta L$ and $2\Delta L$ become as:  \begin{center}  $\left|H\left(\lambda\right)\right|^{2}= \frac{1}{4}  \left[ \cos\left(\beta\Delta L\right)^2 \times \cos\left(2\beta\Delta L\right)^2 \right]$ \end{center}   
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