Investigation of temperature prolife in the waveguide

Abstract

The demand for data traffic has initiated the development of optical telecommunications. Due to explosive growth of optical network, has brought forward an increased need for guided-wave optical component. The purpose of this work is to investigate the temperature profile in the thermo-optic waveguide. Here, we use one and two dimensional model to analyze the thermal model. We focus on polymer waveguide since these technology is attractive for many advantages, including large thermo-optic coefficient (for Polyurethane (PUR): dn/dt ~ -3.3-4 K-1) and low thermal conductivity ( ~ 0.19 W m-1 K-1). The buried and rib waveguide structure is used for two dimensional model thermal analysis. We interested to see how heating the heater will change the refractive index and change the profile in the waveguide. Thermal coupling became next task of this project. We analyze the effect of heater to the nearby waveguide. To perform this analysis, we utilized a commercial finite element method (FEMLAB 2.0), which is a tool for PDE-based multiphysics modelling in an interactive environment-MATLAB. The simulated result will use one and two dimensional model respectively. Effective index change is dependency of heater size as well as distance between core to the heater. Increasing 1µm of heater width will reduce -0.1 of dneff/dt it also increasing the power consumption. Thermal coupling is related to waveguide spacing and depth. The coupling estimation is increase with the waveguide depth but decrease with the waveguide spacing. Apply trench structure can reduce the thermal coupling estimation, K .The temperature of heated waveguide decreases as the trench depth increases, therefore it requires less power in performing its function.