Abstract
In this paper, we present a new and efficient algorithm for the exact synthesis of large-mode-area (LMA) single-mode (SM) optical fibers supporting “perfect top-hat” modal electric-field profiles. We develop a technique for calculating directly and accurately the refractive-index profiles of such fibers from the knowledge of the top-hat modal electric field. The method we use to solve this inverse problem is via modeling the waveguide transversely as a transmission line. We demonstrate this algorithm with a number of example reconstructions of LMA SM optical fibers with perfect “top-hat” electric-field profile and an effective mode area (Aeff) size that in some cases exceeds 4000 μm2. Such fiber designs reduce or suppress the nonlinear effects, such as stimulated Brillouin scattering, stimulated Raman scattering, and self-phase modulation, in high-power applications. Moreover, we expect this LMA SM top-hat fiber design to be useful in optical-damage mitigation. Last but not the least, these “perfect” top-hat electric field profiles are very promising in the field of high-power applications for achieving uniform intensity deposition on the target (material, biological tissue, etc.)
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