title: Low-loss, low-cross-talk crossings for silicon-on-insulator nanophotonic waveguides.
abstract: We present compact crossings for silicon-on-insulator photonic wires. The waveguides are broadened using a 3 microm parabolic taper in each arm. By locally applying a lower index contrast using a double-etch technique, loss of confinement is reduced and 97.5% transmission (-1.7 dB) is achieved with only -40 dB cross talk.
authors.affiliation: Ghent University - IMEC, Department of Information Technology, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium. wim.bogaerts@intec.ugent.be
authors.forename: Wim
authors.initials: W
authors.lastname: Bogaerts
authors.forename: Pieter
authors.initials: P
authors.lastname: Dumon
authors.forename: Dries
authors.initials: D
authors.lastname: Van Thourhout
authors.forename: Roel
authors.initials: R
authors.lastname: Baets