In this work, we present the assessment of our electric arc-discharge based technique in order to fabricate optical fiber Long Period Gratings (LPGs) with desired spectral features and period ranging in 410-470 μm, able to excite high order cladding modes useful in chemical sensing applications. Here, a wide experimental investigation was carried out with the aim to study the sensitivity to surrounding refractive index (SRI) changes of several LPGs as function of the grating period, in order to derive a project criterion to improve the SRI sensitivity. Moreover, in order to evaluate the goodness of the experimental results, we compare the experimental results with numerical ones based on coupled-mode theory achieving very good agreement.
1 Jan 2016
Volume: 168 Pages: 999-1002