Title :
Systematic Engineering of Waveguide-Resonator Coupling for Silicon Microring/Microdisk/Racetrack Resonators: Theory and Experiment
Author :
Soltani, Mohammad ; Yegnanarayanan, Siva ; Li, Qing ; Adibi, Ali
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
A systematic engineering of waveguide-resonator coupling for optimum phase matching and field-overlap is proposed to achieve critical coupling and strong over-critical coupling for microring, micro racetrack and microdisk resonators on silicon-on-insulator (SOI) platform. The impact of the waveguide-resonator dimensions, their spacing and interaction length on the strength of the coupling are investigated. We show that by optimization of the dimension of the waveguide-resonator structure, the coupling strength can be engineered to be insensitive to fabrication errors. Based on our optimization techniques, critical coupling to low Q resonators (Q ~ 104) as well as ultra-high Q resonators (Q ~ 3.1 x 106) is experimentally demonstrated.
Keywords :
dielectric waveguides; optical fabrication; optical resonators; optical waveguide filters; coupling strength; critical coupling; fabrication errors; microring/microdisk/racetrack resonators; waveguide-resonator coupling; waveguide-resonator dimensions; Lithography; Nonlinear optics; Optical device fabrication; Optical filters; Optical resonators; Optical waveguides; Resonator filters; Silicon; Systems engineering and theory; Waveguide theory; Coupled mode analysis; dielectric waveguides; microresonators; optical resonators; optical waveguide filters;
Journal_Title :
Quantum Electronics, IEEE Journal of
DOI :
10.1109/JQE.2010.2044633
