title: Highly tunable large-core single-mode liquid-crystal photonic bandgap fiber.
abstract: We demonstrate a highly tunable photonic bandgap fiber, which has a large-core diameter of 25 microm and an effective mode area of 440 microm2. The tunability is achieved by infiltrating the air holes of a photonic crystal fiber with an optimized liquid-crystal mixture having a large temperature gradient of the refractive indices at room temperature. A bandgap tuning sensitivity of 27 nm/degrees C is achieved at room temperature. The insertion loss is estimated to be less than 0.5 dB and caused mainly by coupling loss between the index-guided mode and the bandgap-guided mode.
authors.affiliation: Department of Communications, Optics, and Materials, Technical University of Denmark, Lyngby. ttl@com.dtu.dk
authors.forename: Thomas Tanggaard
authors.initials: TT
authors.lastname: Alkeskjold
authors.forename: Jesper
authors.initials: J
authors.lastname: Laegsgaard
authors.forename: Anders
authors.initials: A
authors.lastname: Bjarklev
authors.forename: David Sparre
authors.initials: DS
authors.lastname: Hermann
authors.forename: Jes
authors.initials: J
authors.lastname: Broeng
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Sebastian
authors.initials: S
authors.lastname: Gauza
authors.forename: Shin-Tson
authors.initials: ST
authors.lastname: Wu