title: Improved coupling technique of ultracompact ring resonators in silicon-on-insulator technology.
abstract: In order to improve the coupling coefficient between a bus waveguide and a bent waveguide of an ultracompact microring to obtain the critical coupling, a design using a bent bus waveguide with reduced width is provided to maintain a better phase matching and increase the coupling. A full vectorial finite difference model, specifically suited for high index contrast and smaller size waveguides, for example, a waveguide in the silicon-on-insulator (SOI) technology, is developed. As a validation, the straight and bent waveguides are simulated using this model, whose results are compared with the results deduced from the measurement results of the ultracompact ring resonators in SOI technology. Also, the model solver is performed to simulate the design, and an experiment is implemented to testify the design.
authors.affiliation: Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China. fanguofang@mail.ipc.ac.cn
authors.forename: Guofang
authors.initials: G
authors.lastname: Fan
authors.forename: Regis
authors.initials: R
authors.lastname: Orbtchouk
authors.forename: Bing
authors.initials: B
authors.lastname: Han
authors.forename: Xinhou
authors.initials: X
authors.lastname: Liu
authors.forename: Zhen
authors.initials: Z
authors.lastname: Zhen