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Refractive index change of fiber optic grating
The index of refraction within the core of the fiber changes along its length, from high-index to low-index. The modulation of the refractive index causes the Fiber Bragg Grating to behave like a mirror that reflects certain wavelengths and transmits others. As a rule, such stmctures are created in germanosilicate fibers by side irradiation of the fiber with UV-radiation either at 2 242 urn, which falls in the. 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. A fiber core irradiated by a pulsed laser is modeled as a cylinder subject to predefined boundary conditions using COMSOL5.
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