A semicircular fiber (SCF) was fabricated by flame-heated treatment for displacement sensing application. By launching a laser beam into the SCF, interference was created at the output port of the structure due to fiber-bending-induced birefringence. Experiments indicate that the resonant wavelength was shifted to shorter wavelengths with increasing transverse displacement. Displacement sensitivity increases with the decrease of the bending radius of the SCF. A high sensitivity of 1100 nm/mm was obtained for the SCF with a bending radius of 0.57 mm.
© 2012 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: October 11, 2012
Revised Manuscript: December 4, 2012
Manuscript Accepted: December 4, 2012
Published: December 20, 2012
Linlin Xu, Ying Li, and Baojun Li, "Semicircular fiber-based high-sensitivity displacement sensor," Opt. Lett. 38, 64-66 (2013)