title: Athermal waveguides for optical communication wavelengths.
abstract: We report on the design, fabrication, and characterization of temperature insensitive strip silicon-on-insulator racetrack resonators. The influence of various parameters, such as waveguide width, waveguide height, ring radius, coupling length, ring gap, and operating wavelength, on temperature-dependent wavelength shift is examined. A resonant wavelength shift of 0.2 pm/K at a 1550 nm wavelength is measured for 335 nm × 220 nm waveguides. A significant reduction of waveguide propagation losses, improved ring Q value, and higher extinction ratio are obtained after overlaying the silicon waveguides with a polymer cladding.
authors.affiliation: Advanced Technology Institute, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, UK. m.milosevic@surrey.ac.uk
authors.forename: Milan M
authors.initials: MM
authors.lastname: Milošević
authors.forename: Neil G
authors.initials: NG
authors.lastname: Emerson
authors.forename: Frederic Y
authors.initials: FY
authors.lastname: Gardes
authors.forename: Xia
authors.initials: X
authors.lastname: Chen
authors.forename: A A D T
authors.initials: AA
authors.lastname: Adikaari
authors.forename: Goran Z
authors.initials: GZ
authors.lastname: Mashanovich