3 years ago

Highly Sensitive Two-Dimensional Bending Vector Sensor Using an Elliptic Two-Core PCF

Khurram Naeem, Youngjoo Chung, Il-Bum Kwon,
A highly sensitive and simple all-fiber interferometric two-dimensional (2D) bending vector sensor is demonstrated. Fiber interferometer works in reflection mode and formed by manually splicing a small section of elliptic two-core photonic crystal fiber at the end of a single-mode fiber. Due to the birefringence nature of the two cores, the fiber device exhibits orientation-dependent bend sensitivity which is different for different polarization states. A high sensitivity of 6.49 nm/mm is achieved for bending along the ${x}$ -direction, and the rms deviations for bending in the $x$ - and ${y}$ -directions are estimated to be 0.015 and 0.098 mm, respectively, by using the matrix method. The device is immune to bend-induced power fluctuation.
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