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. 2020 Dec 22;9:202. doi: 10.1038/s41377-020-00432-2

Fig. 1. Asymmetric and symmetric approaches to an SPSM.

Fig. 1

a Dominant approach to split the degenerate fundamental modes by structural asymmetry. b Proposed Bragg fibre design to guide light by a singly degenerate mode with lower loss than other modes. c The topological PCF provides singlet mid-gap dispersion for a broadband SPSM