Analysis 

The goal of analysis is to find the group index of the manufactured device and compare that to the results found in simulation.  To do this, we must first determine the parameters of the MZI based on the measured data.
First step is to remove the response of the grating couplers so we can see the effect of the MZI itself.  For example, Figure \ref{955645} shows the measured data of a de-embedding device: one input GC followed by a Y-branch which connects to two output GC.  As can be seen, the response peaks around 1600 nm.