The z-component of the Poynting vector Sz across the fibre for a HE polarisation mode as the wavelength is increased from 1.18 to 1.57 um, showing how the mode changes from a surface mode to a core mode and the transitions thereafter. Authors investigate ring-structured Bragg fibres that support a single TE polarisation mode. [See article by Argyros et al. Fig. 8 for details.]
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