The concentration of dopant materials which are responsible for the variation of the dielectric profile of the fused SiO2 host material for optical fibres also changes the elastic properties. This change has been observed by an acoustic microscope operated at 450 MHz. Acoustic micrographs of single-mode, multimode graded-index and multimode step-index optical fibres are given. This technique may be applicable to the study of fibre acoustic waveguides.
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Jen et al. (1983) studied this question.
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