title: Design of waveguide grating with ultrafast tunable index contrast.
abstract: A long-period waveguide grating (LPWG) with a tunable index contrast is proposed. The design features a simple configuration that consists of a two-mode waveguide formed on periodically poled lithium niobate with an angle with respect to its domain wall and a traveling-wave electrode. In the design, the electrical traveling wave introduces a periodic change in the refractive index of waveguide, which functions as a long-period waveguide grating that couples between symmetric and anti-symmetric core modes. The index contrast of grating can be controlled by the traveling-wave intensity. For application to ultrafast device, structural parameters satisfying velocity and impedance matching conditions are numerically calculated.
authors: Photonics Sensor System Center, Korea Institute of Science and Technology, Seoul, Korea. sdlim@kist.re.kr
authors: Sun
authors: S
authors: Do Lim
authors: In-Kag
authors: IK
authors: Hwang
authors: Kwanil
authors: K
authors: Lee
authors: Byoung Yoon
authors: BY
authors: Kim
authors: Sang Bae
authors: SB
authors: Lee
mesh_terms: D017076:Computer-Aided Design; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D012031:Refractometry / Q000295:instrumentation*