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Practical tuning mechanism for fused-tapered couplers

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Abstract

The axial twisting of a fused-tapered single-mode fiber coupler causes optical decoupling, which can change the power-splitting ratio of the coupler. Twisting of the coupling region causes a redistribution of the modal fields away from the coupler axis as a result of an effective refractive-index change. A simple analytical expression is derived that describes this decoupling effect. An environmentally stable package is implemented that allows a coupler’s response to be tuned through all possible values.

© 1988 Optical Society of America

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Equations (4)

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