Study and Analysis of Nature of Cladding modes in Tilted Fiber Bragg Gratings and their Correlation with Grating Parameters for Design of Optimized Sensors

摘要

Cladding resonances generated in a Tilted Fiber Bragg Grating (TFBG) structure are readily employed forsensing purposes. They interact readily with surrounding media and allow for employing accurate refractometricapplications. The grating parameters like angle of tilt, length and pitch of grating, have considerable impacton the nature of cladding resonances generated, and it turn, highly govern the specifics of sensing, like dynamicrange, sensitivity, controllability, etc. In this paper, an organised and ellaborate study and analysis has beenpresented, to elucidate the correlation between cladding modes excited and various grating parameters in aTFBG structure. This is intended to facilitate the design of optimized TFBG sensor structures complying withpre-defined measures of sensitivity and dynamic range of operation. It is safe to imply that this study will enablefabrication of optimised sensors, according to pre-de ned requirements. All analysis is based on simulationscarried out on OptiGrating software and MATLAB.