Abstract
We report a fiber strain sensor based on a single fiber Bragg grating (FBG) with
a minimum detectable strain of 280 femtostrain/√Hz in the 20-kHz range. This
breakthrough was made possible by operating the FBG on one of its slow-light peaks, and
utilizing a FBG with a particularly low loss, fabricated using ultrafast pulses, to
maximize the sensitivity. A theoretical and experimental noise analysis shows that the
sensor noise is limited by laser frequency noise and not fiber phase noise, which
suggests that even greater performance can be expected with a more stable laser
frequency. © 2012 Optical Society of America
© 2013 IEEE
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