Are optical vortices robust in twisted fibres?

We study the question of robustness of optical vortices (OVs) in twisted anisotropic and elliptical fibres with respect to external perturbations which do not depend on the longitudinal coordinate. On the basis of the developed modification of the coupled mode theory we show that the topological cha...

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Bibliographic Details
Published in:Journal of optics (2010) 2012-08, Vol.14 (8), p.85702-1-6
Main Author: Alexeyev, C N
Format: Article
Language:English
Subjects:
Anisotropy
Applied sciences
Charge
Current carriers
Exact sciences and technology
Fiber optics
Fibers
Fibres
Fluid flow
Fundamental areas of phenomenology (including applications)
Optical telecommunications
optical vortex
Optics
Physics
Robustness
spun anisotropic fibres
spun elliptical fibres
Telecommunications
Telecommunications and information theory
Topology
Wave optics
Wave propagation, transmission and absorption
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Summary:We study the question of robustness of optical vortices (OVs) in twisted anisotropic and elliptical fibres with respect to external perturbations which do not depend on the longitudinal coordinate. On the basis of the developed modification of the coupled mode theory we show that the topological charge carried by OVs in twisted elliptical and anisotropic fibres proves to be robust with respect to induced material anisotropy of the fibre. In contrast, OVs and the topological charge carried are unstable with respect to induced z-independent additional ellipticity of the transverse cross-section of the fibre. In this case OVs are found to invert their initial topological charge upon propagation. We also compare the robustness of OVs in twisted fibres with their robustness in ideal fibres.
ISSN:2040-8978
2040-8986
DOI:10.1088/2040-8978/14/8/085702