title: Photonic crystal directional coupler switch with small switching length and wide bandwidth.
abstract: A directional coupler switch structure capable of short switching length and wide bandwidth is proposed. The switching length and bandwidth have a trade-off relationship in conventional directional coupler switches. Dispersion curves that avoid this trade-off are derived, and a two-dimensional photonic crystal structure that achieves these dispersion curves is presented. Numerical calculations show that the switching length of the proposed structure is 7.1% of that for the conventional structure, while the bandwidth is 2.17 times larger.
authors.forename: Noritsugu
authors.initials: N
authors.lastname: Yamamoto
authors.forename: Toru
authors.initials: T
authors.lastname: Ogawa
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Komori