Fiber Bragg grating sequential UV-writing method with real-time interferometric side-diffraction position monitoring.
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.
Hsu
Kuei-Chu
KC
Sheu
Lih-Gen
LG
Chuang
Kai-Ping
KP
Chang
Shu-Hui
SH
Lai
Yinchieh
Y