Abstract

We report the fabrication of long-period gratings (LPGs) in wavelength-scale microfibers with diameters from 1.5to3μm. The LPGs were fabricated by use of a femtosecond IR laser to periodically modify the surface of the fibers. These LPGs have grating periods of a few tens of micrometers, much smaller than those in conventional optical fibers. A compact 10-period LPG with a device length of only 150μm demonstrated a strong resonant dip of >20dB around 1330nm. These microfiber LPGs would be useful in-fiber components for microfiber-based devices, circuits, and sensors.

© 2009 Optical Society of America

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