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 $308\mathrm{\mu }\mathrm{m}$ diameter microknot add–drop filter with a free spectral range (FSR) of $1.8\mathrm{nm}$ . A Q factor of $\sim 3300$ is obtained from a cross-coupling $65\mathrm{\mu }\mathrm{m}$ diameter microknot add–drop filter with a FSR of $8.1\mathrm{nm}$ . This device is particularly easy to fabricate and to connect to fiber systems.

© 2007 Optical Society of America

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