Open AccessLoop coupled resonator optical waveguides
Author(s) -
Junfeng Song,
Lian-Wee Luo,
Xianshu Luo,
Haifeng Zhou,
Xiaoguang Tu,
Litao Jia,
FengLing Qing,
GuoQiang Lo
Publication year - 2014
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.024202
Subject(s) - optics , resonator , waveguide , physics , slow light , photonic crystal , coupling (piping) , loop (graph theory) , scattering , reflection coefficient , reflection (computer programming) , band pass filter , materials science , mathematics , combinatorics , computer science , metallurgy , programming language
We propose a novel coupled resonator optical waveguide (CROW) structure that is made up of a waveguide loop. We theoretically investigate the forbidden band and conduction band conditions in an infinite periodic lattice. We also discuss the reflection- and transmission- spectra, group delay in finite periodic structures. Light has a larger group delay at the band edge in a periodic structure. The flat band pass filter and flat-top group delay can be realized in a non-periodic structure. Scattering matrix method is used to calculate the effects of waveguide loss on the optical characteristics of these structures. We also introduce a tunable coupling loop waveguide to compensate for the fabrication variations since the coupling coefficient of the directional coupler in the loop waveguide is a critical factor in determining the characteristics of a loop CROW. The loop CROW structure is suitable for a wide range of applications such as band pass filters, high Q microcavity, and optical buffers and so on.