Tapers and Y-Junctions...

FIMMPROP is ideal for designing continuously varying structures such Y-junctions and tapers where near-adiabatic performance is sought. Exploiting these near-adiabatic properties with semi-analytic routines, the program is able to determine how long a structure must be to achieve adiabatic coupling much more rapidly than traditional optical propagation techniques. Moreover, tapers can be modelled with arbitrarily wide angles and high refractive index step, since FIMMPROP makes no approximations, in the isotropic Maxwell's equations.

      OPTIMAL LENGTH FOR A Y-JUNCTION...                  

Here the FIMMPROP scanner was used to analyse the variation with varying structure length of the power in the fundamental mode at the output ports. Although the y-junction becomes adiabatic only at infinite length as expected, the graph will tell you immediately the minimum length required for e.g. 80% efficiency.

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