Fabrication and Measurement of Miniaturized Fiber Bragg Grating
Date Issued
2009
Date
2009
Author(s)
Chen, Li-Lun
Abstract
Traditional Fiber Bragg Gratings (FBGs) are fabricated using 125 μm single-mode fibers. In order to miniaturize the size of an FBG, the common method is to use hydrofluoric acid (HF) to etch 125 μm FBG. The core size of the FBGs made by this method is therefore unchanged. In this thesis, 125 μm fibers are used as preforms and drawn to smaller sizes by the homemade modified drawing system that our group developed. The difference between our method and traditional HF-etching approach is that in our experiment the core diameter would change linearly with the outer cladding diameter during the drawing process. The core power confinement factor would decrease due to the decrease of the core diameter. We can see the influence of core power confinement to the effective index change in the fiber core by in situ monitoring of the resonance wavelength drift during the grating writing process. In our work, the temperature sensitivity of miniaturized FBGs is 10 pm/℃, which is lower than that of a 125 μm FBG, 11.6 pm/℃. The strain sensitivity of miniaturized FBG is 1.2 pm/με, which is higher than that of a 125 μm FBG 1 pm/με.
Subjects
fiber Bragg grating,
fiber drawing
miniaturized fiber Bragg grating
hydrofluoric acid etching
core power confinement factor
Type
thesis
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