Apodization Method Owing to the Finite Length of UV Laser Coherence in Fabricating Fiber Bragg Gratings

Abstract

A very effective apodization, in which side lobes are suppressed to below a particular noise level, is found to operate automatically in a two-beam interference device for fabricating fiber Bragg gratings when a pair of mirrors deflecting two beams are off parallel to each other. This is considered to be a consequence of the short temporal coherence length of the KrF excimer laser used.

Design of multiplexed fiber optic chemical sensing system using clad-removable optical fibers

“…In the proposed system, the sensor node preparation did not involve processes such as phase masking [32,33] or exposing the fiber to interference patterns [34], as in the case of FBG. Also, the sensor node did not need to be re-coated or re-cladded, as in the cases of [16,21,26,27,30], and did not require installation of any external equipment as in the cases of [12,15].…”