Spectral Characteristics of Uniform Fiber Bragg Grating With Different Grating Length and Refractive Index Variation

The spectral response of the uniform FBG with different grating parameters such as grating length and index change are provided and discussed. The coupled mode theory is a suitable tool for analysis and obtaining quantitative information about the spectrum of a fiber Bragg grating. The coupled mode equations can be obtained and simplified by using the weak waveguide approximation. The spectrum characteristics can be obtained by solving these coupled mode equations. In this paper simulation of FBG has been carried out to analyze the spectral characteristics of the FBG. An optical FBG is being simulated with the help of advanced software module such as the R soft and the modeled sensor is evaluated for the grating and different efficiency of various grating shape parameters, modulation depth,etc. The relationship between the maximum reflectance, 3dB bandwidth and centre wavelength with grating parameters are also given and discussed. Optimization and improvement of the system can be realized by using the simulation results. Since the present work not only deals with theoretical aspects of FBGs but also leads to the development of simulation tools which can be used in the area of communications and sensors.