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Bending-induced resonant couplings between the central and the side-core in helically twisted fiber

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Abstract

We report on a new type of long-period-grating generated in a helical core fiber by bending. The grating arises from bent-induced cosinusoidal modulation of an optical path of the mode guided in the helical core with a period equal to the helix pitch. It induces multiple resonant couplings between the fundamental modes guided in the central core and the helical side-core.

© 2020 The Author(s)

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