Mode-coupling mechanism in square-law multimode fibres are experimentally studied. Measurements are done using the near- and far-field techniques. Special attention is paid to comparing the coupling strength of the microbending type (Δv = ± 1) with that of the elliptic deformation type (Δv = ± 2). Typically, the latter is much stronger. The significance of this property in transmission aspects is briefly reviewed.
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Kawakami et al. (1983) studied this question.
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