Wang Xiaozhen, Li Wenhai, Chen Liang, Bao Xiaoyi
Fiber Optics Group, Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada.
Opt Express. 2012 Jul 2;20(14):14779-88. doi: 10.1364/OE.20.014779.
We investigate the thermal and mechanical properties of optical fiber taper by using a high spatial resolution Optical Frequency-domain Reflectometry scheme. It was found that the spectral shifts induced by the temperature or strain changes in the fiber taper region are strongly related to the refractive index change of the fundamental mode. It is shown that residual stress induced by taper process results in the inhomogeneous thermal properties, which are eliminated by annealing treatment. The wavelength-force sensitivity is dramatically enhanced by the reduced waist diameter of the taper. It was demonstrated that a taper with a waist diameter of ~6 μm has a wavelength-force coefficient of 620.83 nm/N, ~500 times higher than that of the standard single mode fiber.
我们采用高空间分辨率光频域反射测量方案研究了光纤锥的热学和力学性能。结果发现，光纤锥区域内温度或应变变化引起的光谱位移与基模的折射率变化密切相关。研究表明，锥化过程产生的残余应力导致热性能不均匀，而退火处理可消除这种不均匀性。锥的腰径减小显著提高了波长-力灵敏度。结果表明，腰径约为6μm的光纤锥的波长-力系数为620.83nm/N，比标准单模光纤高约500倍。
