Fiber Bragg grating coherence spectrum modeling, simulation, and characteristics

The fiber Bragg grating (FBG) coherence spectrum, which comes from mode coupling with both core-bounded and cladding-bounded modes, was modeled and simulated using a dynamic mode selecting rule together with the coupling equations. Grating saturation effects were included in the index distribution modeling for its significant influence on the coupling process. The grating spectrum under normal experimental testing conditions was modeled and simulated for the purpose of experimental analysis and device design.