Journal
OPTICS COMMUNICATIONS
Volume 284, Issue 22, Pages 5299-5302Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2011.07.049
Keywords
Fiber-optic sensor; Fiber laser; Interferometer; Long-period fiber grating; Torsion sensor
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Funding
- Fundamental Research Funds for the Central Universities [CDJZR10120012]
- Chongqing University [CDJXS11120020]
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We experimentally demonstrate a fiber ring laser for high-resolution torsion measurement, where the laser cavity consists of a Mach-Zehnder interferometer formed with a pair of long-period fiber gratings written in a twisted single-mode fiber by a CO(2) laser. The emitting wavelength of the laser provides a measure of the rate of the torsion applied to the grating pair, while the direction of the wavelength shift indicates the sense of the applied torsion. The narrow linewidth and the large side-mode suppression ratio of the laser can provide a much more precise measurement of torsion, compared with passive fiber-optic torsion sensors. The torsion sensitivity achieved is 0.084 nm/(rad/m) in the torsion range +/- 100 rad/m, which corresponds to a torsion resolution of 0.12 rad/m, assuming a wavelength resolution of 10 pm for a typical optical spectrum analyzer. The ultimate resolution of the sensor is limited by the linewidth of the laser and could be an order of magnitude higher. (C) 2011 Elsevier B.V. All rights reserved.
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