Abstract
The scalar local-field wave equations in helical fibres are derived and, with the aid of a special mathematical treatment, solved approximately in a local coordinate system—the Serret-Frenet frame from the Maxwell's equations. Two basic results are obtained: (1) The local modes in a single-mode helical fibre are circularly polarized. (2) The difference of the propagation constants between the two fundamental modes is 2τ, where τ is the torsion. They agree well with the known experimental measurements.
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Chen, G., Wang, Q. Local fields in single-mode helical fibres. Optical and Quantum Electronics 27, 1069–1074 (1995). https://doi.org/10.1007/BF00292136
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DOI: https://doi.org/10.1007/BF00292136