1. Monireh Moayedi Pour Fard Monireh.moayedipourfard@mail.mcgill.ca Photonics system group McGill University July 2012

2.  Directional Coupler has many applications in photonic systems and optical communication  50/50, 20/80, 10/90, …  Coupling ratio change with wavelength Gap Coupling Length (Lc)

3.  What is a tunable coupler? ◦ Tunable Coupling ratio ◦ Tunable Wavelength  Tuning by changing the refractive index Changing the temperature Carrier injection

4.  Design and simulation of directional couplers ◦ Sweeping temperature in couplers with different lengths, gaps, and waveguide structure. ◦ Studying the usage of temperature sensitive polymer as cladding part. Strip Waveguide ridge Waveguide Non-uniform ridge Waveguide

5.  Find supermode effective indices, Lumerical mode solver  calculate coupling  Sweep effective indices changes based on temperature changing  Sweep effective indices changes based on wavelength changing  Studying the effect of temperature sensitive polymer as cladding

6. Thanks!