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MZI Gain reponses (MZ1-MZ3)  Three MZI designs (MZI1 to MZI3) demonstrates three different path lenghts. Figure \ref{fig:mzi1-3} illustrates the gain responses of those interferometers. Those results show the effect of the path length difference, where shorter differences gives few peak responses or large FSR. The FSR is reduced as the path length difference increase.