Properties of doubly-clad optical fibres with a low-index inner cladding (W-type fibres) as single-mode or multimode transmission lines are discussed both from theoretical and experimental viewpoints. Such fibres are characterised by the tight confinement of the modal power in the core. A small bending loss is one of its consequences. A single-mode W-type fibre can be used at a v-value significantly larger than 2.405, and it has an anomalous dispersion effect. A multimode W-type fibre is also discussed.
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Kawakami et al. (1976) studied this question.
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