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Chapter 4: Theory of Fiber Bragg Gratings - Pg. 119

Chapter 4 Theory of Fiber Bragg Gratings Fashionable gratings are in. Wave propagation in optical fibers is analyzed by solving Maxwell's equations with appropriate boundary conditions. The problem of finding solutions to the wave-propagation equations is simplified by assuming weak guidance, which allows the decomposition of the modes into an orthogonal set of transversely polarized modes [1­3]. The solutions provide the basic field distributions of the bound and radiation modes of the waveguide. These modes propagate without coupling in the absence of any perturbation (e.g., bend). Coupling of specific propagating modes can occur if the waveguide has a phase and/or