Abstract
A simple and compact fiber bending sensor based on the Mach-Zehnder interferometer was proposed. A photonic crystal fiber (PCF) with a length of 10 mm was spliced by collapsing air holes with two conventional single mode fibers to consist of an all fiber bending sensor. The sensitivity of 0.53 nm/m -1 was obtained at 1586 nm for the curvature range from 0 to 8.514 m -1 . The temperature sensitivity was very low. The measurement error due to the temperature effect was about 3 8.68 10 m -1 /℃, and the temperature effect in the curvature measurement could be ignored. This device can avoid the cross sensitivity of the temperature in the curvature measurement.
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