In this study, the Fibre Bragg grating (FBG) is modelled, simulated, and characterised with respect to maximum reflectivity, bandwidth, the impact of applied strain on the wavelength shift, ?B, and the wavelength shift sensitivity with strain for an optical sensing . In this study, the Fibre Bragg grating (FBG) is modelled, simulated, and characterised with respect to maximum reflectivity, bandwidth, the impact of applied strain on the wavelength shift, ?B, and the wavelength shift sensitivity with strain for an optical sensing . In this study, the Fibre Bragg grating (FBG) is modelled, simulated, and characterised with respect to maximum reflectivity, bandwidth, the impact of applied strain on the wavelength shift, ?B, and the wavelength shift sensitivity with strain for an optical sensing system. This study measures the. FBG, Fiber Bragg Grating (FBG) sensors, optical properties, versatile sensing, optical devices, realtime applications, sensing technology Fiber Bragg Grating (FBG) sensors have emerged as a transformative technology with applications across several industries due to their unique optical properties. In this study, a commercial FBG with the center wavelength of 1550nm is used in order to measure the spectral response of FBG to strain. The parameters used in these simulations are the fiber grating length, L ranging from 1 to 10mm, the changes in refractive index, “n from 0. 0020, the. Fiber Bragg Grating (FBGs) are the most commonly utilized technique for this purpose. The purpose of this research is to use OptiWave to simulate the strain in an FBG system and to vary parameters in an FBG system using Optiwave. It should be noted that temperature and strain sensitivities must be considered, when high performance of the optimal sensor is required.