title: Reduction in the diffraction loss of an arrayed-waveguide grating by use of an interference fringe between slab and arrayed waveguides.
abstract: We propose a novel method for reducing the diffraction loss in an arrayed-waveguide grating. Our method introduces an interference fringe at the interface between slab and arrayed waveguides to relax the mode mismatch between them. We achieved a loss reduction of more than 0.42 dB with this method. Moreover, we provide an explanation of the loss-reduction mechanism of our method in terms of the point of imaging property of light.
authors.affiliation: NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa, 243-0198, Japan. kenya@aecl.ntt.co.jp
authors.forename: Kenya
authors.initials: K
authors.lastname: Suzuki
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Shibata
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Inoue
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Takahashi