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Opt Lett. 2007 Jun 15;32(12):1710-2.

All-fiber add-drop filters based on microfiber knot resonators.

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1
Department of Optical Engineering, Zhejiang University, Hangzhou, China.

Abstract

We demonstrate an all-fiber add-drop filter composed of a microfiber knot (working as a resonator) and a fiber taper (working as a dropping fiber). The dropping taper can be either parallel or perpendicular to the input port of the filter. A quality factor (Q factor) of 13,000 is obtained from a parallel-coupling 308 microm diameter microknot add-drop filter with a free spectral range (FSR) of 1.8 nm. A Q factor of approximately 3300 is obtained from a cross-coupling 65 microm diameter microknot add-drop filter with a FSR of 8.1 nm. This device is particularly easy to fabricate and to connect to fiber systems.

PMID:
17572755
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