Ray theory of graded non-circular optical fibres
Optical and Quantum Electronics, 11, (3), . (doi:10.1007/BF00620105).
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Both bound and tunnelling rays exist in multimode graded fibres which do not have circular symmetry; however, the fraction of energy in the tunnelling rays is generally less than that in a similar circular fibre, especially for near-parabolic profiles. For a large class of non-symmetric profiles, no tunnelling rays can propagate.
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