title: Compact and monolithic coarse wavelength-division multiplexer-demultiplexer fabricated by use of a high-spatial-frequency transmission grating buried in a slab waveguide.
abstract: A compact and monolithic four-channel demultiplexer with 20-nm spacing was fabricated by use of a high-spatial-frequency transmission grating buried in a silica waveguide. The grating was successfully buried in a silica slab waveguide by overcladding by plasma-enhanced chemical-vapor deposition. The device's size was approximately 5.1 mm x 9.2 mm. The average insertion loss was 13 dB. The average cross talk was -15 dB for adjacent channels and -19 dB for nonadjacent channels. The polarization-dependent loss was estimated to be as low as 0.7 dB.
authors.affiliation: New Glass Forum, 1-8-31 Midorigaoka, Ikeda-shi, Osaka-fu, 563-8577, Japan. TatsuhiroNakazawa@mail.nsg.co.jp
authors.forename: Tatsuhiro
authors.initials: T
authors.lastname: Nakazawa
authors.forename: Shigeo
authors.initials: S
authors.lastname: Kittaka
authors.forename: Keiji
authors.initials: K
authors.lastname: Tsunetomo
authors.forename: Kenji
authors.initials: K
authors.lastname: Kintaka
authors.forename: Junji
authors.initials: J
authors.lastname: Nishii
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Hirao