\(n_{eff}(\lambda) = 2.4 - 1.1(\lambda-1.55) - 0.1(\lambda-1.55)^{2}\)

Mach-Zehnder Interferometer

The basic layout of a MZI is shown in figure \ref{127114}.  Incoming light is split into two branches.  For the unbalanced MZI, these branches have different lengths.  The light is coupled together at the end.  For frequencies that experience a \(\pi\) phase shift from the different lengths, those frequencies will destructively interfere and the light radiates out of the waveguide.