Fiber ring laser incorporating a pair of rotary long-period fiber gratings for torsion measurement

Leilei Shi; Tao Zhu; Fangyuan Chen; Kinseng Chiang; Yunjiang Rao

doi:10.1117/12.914366

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30 January 2012 Fiber ring laser incorporating a pair of rotary long-period fiber gratings for torsion measurement

Leilei Shi, Tao Zhu, Fangyuan Chen, Kinseng Chiang, Yunjiang Rao

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Proceedings Volume 8351, Third Asia Pacific Optical Sensors Conference; 83510K (2012) https://doi.org/10.1117/12.914366
Event: Asia Pacific Optical Sensors Conference, 2012, Sydney, Australia

Abstract

We demonstrate a fiber ring laser for high-resolution torsion measurement, where the laser cavity consists of a Mach-Zehnder interferometer (MZI) formed with a pair of long-period fiber gratings written in a twisted single-mode fiber (SMF) by a CO₂ 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 direction 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.

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Leilei Shi, Tao Zhu, Fangyuan Chen, Kinseng Chiang, and Yunjiang Rao "Fiber ring laser incorporating a pair of rotary long-period fiber gratings for torsion measurement", Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 83510K (30 January 2012); https://doi.org/10.1117/12.914366

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