Wavelength Independent Coupling Length Variation analysis using Silicon on Insulator based Rectangular Waveguide for Coupler/Splitter Application

Abstract

Silicon on Insulator (SoI) technology poised to revolutionalize photonic world in terms of device compactness and operational speed. Many of the photonic active and passive devices uses waveguides in their geometry to couple optical power. Devices which uses coupler as their part of geometry are ring resonator, race track resonator, coupler and splitter itself [1]–[3]. As optical power transfers from one waveguide to other waveguides, therefore, coupling length (Lc) is an important parameter which requires precise calculation. To validate coupling length variation, rigourous simulation is performed using Finite Element Method (FEM) based Comsol Multiphysics software at 1550 nm operational wavelength.