Multimode optical fibers: Profile control and analysis


  • Herman M. Presby


The information carrying capacity of multimode optical fibers is mainly determined by the quality of the refractive index distributions of their cores. With ideal refractive index distributions, these fibers can, in principle, have signal band widths on the order of 10 GHz km. However, extremely careful control of the index profile is required to achieve this theoretical goal. Slight departures from the optimum index distribution lead to a dramatic decrease of the fiber bandwidth.