A Y Junction
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This example models a simple Y-Junction. 

The Y-Junction can be implemented using mwg waveguides. Therefore, only one taper section needs to be defined.

* Open the project.
* Select the FIMMPROP component called yjunction.
* right-click on the taper section
* Select Edit WG cross Section\On LHS

This will display the mwg which has been used to define the left-hand side
of the taper. As can be seen, we have two overlapping waveguide cores. The
taper algorithm uses this definition to generate rwgs that correctly split
the cores to form the two branches.

The project has been set up such that the y-junction is nearly adiabatic.
Therefore, the input power is split evenly between the two branches.