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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