title: Polarization control method for ultraviolet writing of advanced Bragg gratings.
abstract: We present a flexible and simple method for UV writing of Bragg gratings with advanced apodization profiles including discrete phase shifts. The method is based on a p phase shift between the refractive-index modulation profiles induced by s and p polarization of UV light. By changing the ratio of UV intensity in the two polarizations we are able to control the modulation strength and to induce phase shifts while keeping a constant effective refractive index throughout the Bragg grating. We demonstrate strong UV-written Bragg gratings with Gaussian or sinc apodizations with spectral shapes, in good agreement with theoretical predictions.
authors.forename: Jesper Bo
authors.initials: JB
authors.lastname: Jensen
authors.forename: Nikolai
authors.initials: N
authors.lastname: Plougmann
authors.forename: Hans-Jã Rgen
authors.initials: HJ
authors.lastname: Deyerl
authors.forename: Poul
authors.initials: P
authors.lastname: Varming
authors.forename: Jã Rg
authors.initials: JR
authors.lastname: Hã Bner
authors.forename: Martin
authors.initials: M
authors.lastname: Kristensen