Radiation in Bent Asymmetric Coupled Waveguides

TL;DR

This paper presents a numerical analysis of radiation in bent asymmetric coupled waveguides, demonstrating improved accuracy over 2D methods for designing low-loss micro-resonators.

Contribution

It introduces 3D full vector computations for analyzing radiation in curved waveguides, surpassing previous 2D FDTD methods in accuracy for practical design.

Findings

3D simulations agree qualitatively with 2D analyses

Enhanced design accuracy for micro-resonators

Potential for reduced radiation loss in curved waveguides

Abstract

A numerical study of the radiation in coupled bent waveguides is presented. Such arrangements of curved waveguides in reduced radiation-loss configurations can be used to enhance the quality factor of integrated micro-resonators. 3D full vector computations of the complex modal fields (and propagation constants) and the transient propagation effects have been performed. The results obtained agree qualitatively with former 2D FDTD analyses. At the same time, the calculations presented meet the accuracy requirements for the design of practical implementations that are unattainable with 2D approaches.