A necessary and sufficient condition is given for the modulation-transfer-function of certain multimode optical fiber guides to be zero free in the closed right-half of the complex plane, and to be structurally stable with respect to that property. The condition is of interest, for example, in connection with the possibility of determining the phase of a modulation-transfer-function from its amplitude.
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Irwin W. Sandberg (1978) studied this question.
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