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The modes of weakly guiding fibers, constructed from anisotropic material which exhibits ultrahigh birefringence, are investigated. These modes are plane polarized unless the fiber is virtually uniaxial, withnₓ = ny ≠ nz. The modal intensity patterns are, in general, noncircular, even for fibers of circular cross section.
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Snyder et al. (1984) studied this question.
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