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Dual-core fiber as a tunable directional coupler

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Abstract

The bending-induced birefringence in a fiber loop is used to restore locally perfect coupling conditions between the two slightly detuned cores of a dual-core fiber. It is also shown that varying the angle between the birefringence and the core’s axis allows one to obtain perfect control (0–100%) of the coupling ratio.

© 1993 Optical Society of America

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