title: Fiber Bragg grating sequential UV-writing method with real-time interferometric side-diffraction position monitoring.
abstract: This work presents a new sequential UV-writing procedure for fabricating long fiber Bragg grating (FBG) devices. To real-time accurately align the position of every exposed FBG section prior to UV exposure, a single-period reference fiber grating with strong refractive index modulation is probed by applying an interferometric side-diffraction method to measure the grating phase as the position reference. In this way the overlapped FBG sections can be connected section-by-section without obvious phase errors, even when the written index-modulation is weak.
authors.forename: Kuei-Chu
authors.initials: KC
authors.lastname: Hsu
authors.forename: Lih-Gen
authors.initials: LG
authors.lastname: Sheu
authors.forename: Kai-Ping
authors.initials: KP
authors.lastname: Chuang
authors.forename: Shu-Hui
authors.initials: SH
authors.lastname: Chang
authors.forename: Yinchieh
authors.initials: Y
authors.lastname: Lai