title: Demonstration of a 3-dB directional coupler with enhanced robustness to gap variations for silicon wire waveguides.
abstract: We demonstrate a robust 3-dB directional coupler which has a narrow silicon wire core and a wide gap. Sensitivity to the gap variation is decreased to one tenth that of a conventional directional coupler. Better spectral stability due to the enhanced robustness to waveguide geometrical fluctuations was experimentally verified.
authors: G W
authors: GW
authors: Cong
authors: K
authors: K
authors: Suzuki
authors: S H
authors: SH
authors: Kim
authors: K
authors: K
authors: Tanizawa
authors: S
authors: S
authors: Namiki
authors: H
authors: H
authors: Kawashima