title: Athermal arrayed waveguide gratings in silicon-on-insulator by overlaying a polymer cladding on narrowed arrayed waveguides.
abstract: Athermal arrayed waveguide gratings (AWGs) in silicon-on-insulator (SOI) are experimentally demonstrated for the first time to our knowledge. By using narrowed arrayed waveguides, and then overlaying a polymer layer, the wavelength temperature dependence of the AWGs is successfully reduced to -1.5 pm/°C, which is more than 1 order of magnitude less than that of normal SOI AWGs. The athermal behavior of the AWGs is obtained with little degradation of their performance. For the central channel, the cross talk is less than -15 dB and the insertion loss is around 2.6 dB. Good characteristics can be maintained with temperatures up to 75 °C. The total size of the device is 350 μm × 250 μm.
authors.affiliation: Photonics Research Group (INTEC), Ghent University–IMEC, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium. Linghua.wang@intec.ugent.be
authors.forename: Linghua
authors.initials: L
authors.lastname: Wang
authors.forename: Wim
authors.initials: W
authors.lastname: Bogaerts
authors.forename: Pieter
authors.initials: P
authors.lastname: Dumon
authors.forename: Shankar Kumar
authors.initials: SK
authors.lastname: Selvaraja
authors.forename: Jie
authors.initials: J
authors.lastname: Teng
authors.forename: Shibnath
authors.initials: S
authors.lastname: Pathak
authors.forename: Xiuyou
authors.initials: X
authors.lastname: Han
authors.forename: Jinyan
authors.initials: J
authors.lastname: Wang
authors.forename: Xigao
authors.initials: X
authors.lastname: Jian
authors.forename: Mingshan
authors.initials: M
authors.lastname: Zhao
authors.forename: Roel
authors.initials: R
authors.lastname: Baets
authors.forename: Geert
authors.initials: G
authors.lastname: Morthier