Specialty Optical Fibers: Analysis and Characterization UDK

This paper gives a closer insight to novel optical fibers by applying specialized numerical analysis approaches. First we have described a newly developed algorithm based on the spectral domain approach, which is employed in the analysis of multilayer optical fibers with circular symmetry. It computes the Green’s functions of the considered fiber and locates the appropriate poles, which correspond to the actual propagating modes of the fiber. Through further analysis of the poles it is possible to obtain information about modal fields, attenuation, bending losses and dispersion properties for all modes present in fibers with very complicated refractive index profile. Furthermore, an approach for the analysis of novel types of fibers belonging to the so-called Photonic Crystal Fibers family is presented. Since the considered fibers can contain various inclusions in the core or the cladding structure, the analysis is in this case based on the modal decomposition of the electric field in spatial domain. In both analysis cases the obtained results were compared to the previously published or where possible measured results, showing very good agreement