Optimise bends...

   Start with an S shape

              There you have it: the optimal structure!  

  do a quick scan...

B  DN

An example of how you can use FIMMPROP-3D to design bends and offsets. Once the eigenmodes have been found in each section, altering the offsets only requires the overlaps at the interfaces to be recalculated, instead of propagating the entire field from scratch. It is therefore feasible to do a scan for a range of offsets to find the configuration giving maximum power output for the fundamental mode.

General
What is FIMMPROP?
Calculation method
Component library
A powerful design interface
Scanning tools...
Graphical tools
Feature/options table

A few examples...
  Design an MMI...
  Optimize a bend..
  Y junctions and tapers...
  Photonic crystals...
Platforms
Customer support