Open AccessAsymmetric Fano resonance and bistability for high extinction ratio, large modulation depth, and low power switching
Author(s) -
Landobasa Yosef Mario,
S. Darmawan,
Mee-Koy Chin
Publication year - 2006
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.14.012770
Subject(s) - fano resonance , extinction ratio , optics , bistability , resonance (particle physics) , physics , resonator , modulation (music) , optical switch , ring (chemistry) , extinction (optical mineralogy) , interferometry , materials science , optoelectronics , atomic physics , wavelength , plasmon , chemistry , organic chemistry , acoustics
We propose a two-ring resonator configuration that can provide optical switching with high extinction ratio (ER), large modulation depth (MD) and low switching threshold, and compare it with two other conventional one-ring configurations. The achievable input threshold is n2IIN ~10-5, while maintaining a large ER (> 10dB) and MD (~ 1) over a 10-GHz (0.1 nm) optical bandwidth. This performance can also be achieved by the ring-enhanced Mach-Zehnder interferometer, and is one to two orders of magnitude better than the simple bus-coupled one-ring structures, because of the use of asymmetric Fano resonance as opposed to the usual symmetric resonance of a single ring. The sharpness and the asymmetricity of the Fano resonance are linked to the low switching threshold and the high extinction ratio, respectively, and also accounts for the different dependence on ring dimensions between the one- and two-ring structures.