Abstract
General mathematical and numerical results are given for graded-index optical fibers excited by parallel beams. The excitation of bound and tunneling rays and their influence on power transmission and impulse response are described. The relevance of the results to other problems such as fiber excitation by partially coherent sources and the appearance of fiber output faces is discussed. The graded-index fiber equivlent of the black-band phenomena in step-index fibers is described and an application to profile determination is considered.
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