Article

Thermal and mechanical properties of tapered single mode fiber measured by OFDR and its application for high-sensitivity force measurement.

Fiber Optics Group, Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada.
Optics Express (impact factor: 3.59). 07/2012; 20(14):14779-88. pp.14779-88
Source: PubMed

ABSTRACT 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.

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Keywords

fiber taper region
 
inhomogeneous thermal properties
 
optical fiber taper
 
refractive index change
 
spatial resolution Optical Frequency-domain Reflectometry scheme
 
standard single mode fiber
 
taper process results
 
thermal
 
wavelength-force sensitivity
 

Xiaozhen Wang