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Abstract
We propose and experimentally demonstrate an all-fiber tunable ${\rm{LP}}_{11}$ mode rotator with 360° range, based on the bending and twisting of the two-mode fiber (TMF). A theoretical model of TMF perturbation and its effect on the spatial pattern of ${\rm{LP}}_{11}$ mode is put forward. We experimentally characterize the implementation of the ${\rm{LP}}_{11}$ mode rotator by an all-fiber polarization controller configuration. The results agree well with the theoretical investigations. We are able to demonstrate arbitrary ${\rm{LP}}_{11}$ mode rotation with 360° range. The insertion loss is less than 0.4 dB when the operation wavelength is varied from 1540 to 1560 nm.
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