2D FDTD of waveguide splitter/combiner

Youtube links:-
http://www.youtube.com/watch?v=3Hq2oQpaNxM
http://www.youtube.com/watch?v=1rELOJHCVbQ&feature=related

Written for Course :-
Computational Electromagnetics, Fall 2011
Department of Electrical Engineering
Indian Institute of Technology Madras (IITM)
Chennai - 600036, India

Authors :-
Sathya Swaroop Ganta, B.Tech., M.Tech. Electrical Engg.
Kayatri, M.S. Engineering Design
Pankaj, M.S. Electrical Engg.
Sumantra Chaudhuri, M.S. Electrical Engg.
Projesh Basu, M.S. Electrical Engg.
Nikhil Kumar CS, M.S. Electrical Engg.

Instructor :-
Dr. Ananth Krishnan
Assistant Professor
Department of Electrical Engineering
Indian Institute of Technology Madras
http://www.ee.iitm.ac.in/~ananthk

Description :-

A waveguide splitter combiner is made of 3 parallel ridges with a small gap in between. Due to modal nature of light, light passed into the central waveguide, leaks into the neighboring waveguides in an analytically fathomable coupling length. The leaked light travels back into
the central waveguide in another coupling length and this goes on and on. Here, there is a 20 micron x 8 micron platform is taken with 3 parallel horizontal ridge waveguides (made of silica i.e n=1.5) of 1 micron width and 20 microns length lying on the centre of the 8 micron width of the platform. They are separated by a distance of 0.25 microns. The region in between and surrounding that of the waveguides are filled with air of refractive index, n=1.