Design of SOI Slotted Ring Resonator for Add/Drop Multiplexing in All Optical Networks

Abstract

This work aims to study the visibility of using Silicon on Insulator (SOI) based slotted ring resonator as an Add/Drop multiplexer in all optical networks. SOI is a technology where a thin layer of crystalline silicon (Si) is formed on the top of a silicon dioxide layer (SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) to achieve a strong confinement of light in small size optical waveguides, allowing for high integration density in all optical integrated circuits. In slotted waveguide, light is propagated in the lower refractive index material rather than in the silicon core. The high index contrast between the two silicon waveguides and the slot material allows high confinement of light and reduces the bending loss. Slotted based ring resonators (RR) are used in the biosensing applications where the resonance frequency depends on the index of the material in the slot. However, in this work, slotted RR is studied and modelled with the aim of designing a small size optical Add/Drop multiplexer. The proposed design is simulated numerically using a 3D simulation software; different parameters were optimized in order to design an Add/Drop multiplexer with a high crosstalk suppression ratio. Crosstalk suppression ratio is defined as the difference between the drop port and the through port responses. In WDM networks, the suppression ratio should exceed a 20 dB to ensure high signal integrity in the multiplexing switch. A novel design of small size, all optical, Add/drop multiplexer with high crosstalk suppression is presented based on the slotted ring resonators for WDM applications. A design of slotted ring resonator based Add/Drop multiplexer with a high suppression ration (20 dB) is proposed. The proposed design provides Add/Drop capability with improved signal integrity and low crosstalk.