Propagation of Optical Pulses Through Cladded Fibers: Modified Theory

A realistic theory of propagation of pulses in optical fibers is presented. Time-bounded em pulses, when launched at the entrance aperture of the dispersive fiber, become spatially bounded as well. Following the Fourier technique, expressions for the time-delay difference and the broadening of the pulses are derived for the spatially bounded quasi-monochromatic pulses after they have traversed a known length in the fiber. The present results, when compared with the experimental observations of Smiley et al., show reasonably good agreement and there is marked improvement over the existing theoretical results.