A Novel Birefringent Photonic Crystal Fiber and Its Application to Curvature Measurement
- A Novel Birefringent Photonic Crystal Fiber and Its Application to Curvature Measurement
- 황규진; 김길환; 임선도; 이관일; 박진우; 이상배
- fiber; laser; sensor
- Issue Date
- Japanese Journal of Applied Physics, Part 1- Regular Papers
- VOL 50, NO 3, 032202-1-032202-4
- We demonstrate a curvature sensor with a newly designed photonic crystal fiber of high birefringence (Hi-Bi PCF). The proposed PCF has two
large air holes in the outer cladding region that give rise to core ellipticity during the fabrication process. The curvature sensor is based on the PCF
Sagnac interferometer, the output spectrum shift of which provides information on the PCF curvature. It turns out that the curvature sensitivity
depends on the bending directions with respect to the large-air-hole alignment. For the two orthogonal bending directions, the curvature
sensitivities near 1480nm are -1.87 nm/m-1 (parallel to the axis of the two large air holes) and 1.24nm/m-1 (perpendicular to the axis of the two
large air holes), respectively, and are also insensitive to environmental temperature variation. The proposed curvature sensor may be useful in
thin structural deflection measurement.
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