title: Dynamic all-optical tuning of transverse resonant cavity modes in photonic bandgap fibers.
abstract: Photonic bandgap fibers for transverse illumination containing half-wavelength microcavities have recently been designed and fabricated. We report on the fabrication and characterization of an all-optical tunable microcavity fiber. The fiber is made by incorporating a photorefractive material inside a Fabry-Perot cavity structure with a quality factor Q >200 operating at 1.5 microm. Under short-wavelength transverse external illumination, a 2 nm reversible shift of the cavity resonant mode is achieved. Dynamic all-optical tuning is reported at frequencies up to 400 Hz. Experimental results are compared with simulations based on the amplitude and kinetics of the transient photodarkening effect measured in situ in thin films.
authors.affiliation: Center for Materials Science and Engineering, Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Gilles
authors.initials: G
authors.lastname: Benoit
authors.forename: Ken
authors.initials: K
authors.lastname: Kuriki
authors.forename: Jean-Francois
authors.initials: JF
authors.lastname: Viens
authors.forename: John D
authors.initials: JD
authors.lastname: Joannopoulos
authors.forename: Yoel
authors.initials: Y
authors.lastname: Fink