Abstract
We propose a novel twist-microstructured fiber design to achieve single-circular polarization single-mode (SCP-SM) transmission. It consists of a round core and three lobes of microstructured regions in cladding. The local modes existing in the microstructured regions make a large coupling coefficient between the fundamental guiding mode and the leaky cladding mode possible. The orthogonal random direction method is used to find the optimal structural parameters, and numerical results show that the bandwidth of efficient circular polarization selectivity for the proposed SCP-SM fiber is approximately 155 nm, ranging from 1400 nm to 1550 nm. The influence of varying the parameters of the microstructured cladding on the single circular polarization performance is also discussed.
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