title: Efficient input and output fiber coupling to a photonic crystal waveguide.
abstract: The efficiency of evanescent coupling between a silica optical fiber taper and a silicon photonic crystal waveguide is studied. A high-reflectivity mirror on the end of the photonic crystal waveguide is used to recollect, in the backward-propagating fiber mode, the optical power that is initially coupled into the photonic crystal waveguide. An outcoupled power in the backward-propagating fiber mode of 88% of the input power is measured, corresponding to a lower bound on the coupler efficiency of 94%.
authors.affiliation: Department of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA. pbarclay@caltech.edu
authors.forename: Paul E
authors.initials: PE
authors.lastname: Barclay
authors.forename: Kartik
authors.initials: K
authors.lastname: Srinivasan
authors.forename: Matthew
authors.initials: M
authors.lastname: Borselli
authors.forename: Oskar
authors.initials: O
authors.lastname: Painter