Design of Uniform Fiber Bragg grating using Transfer matrix method

The holographic technique for grating fabrication has two principal advantages. Bragg gratings could be photoimprinted in the fiber core without removing the glass cladding. Furthermore, the period of the photoinduced grating depends on the angle between the two interfering coherent ultraviolet light beams. Thus even though ultraviolet light is used to fabricate the grating, Bragg gratings could be made to function at much longer wavelengths in a spectral region of interest for devices which have applications in fiber optic communications and optical sensors. The design of fiber Bragg grating depends on various parameters e.g length of the grating, period of gratings, refractive index of core and cladding, mode of excitation conditions and temperature. In this paper, the effect on the reflection spectra of fiber Bragg grating is analyzed at the varied grating length along with the variation of spectral shape with changing refractive index.