Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 22, Issue 16, Pages 1235-1237Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2010.2052797
Keywords
Tilted fiber grating; vertical-cavity surface-emitting laser (VCSEL); vibration measurement
Funding
- Hong Kong Polytechnic University of Hong Kong Special Administrative Region, China [G-YX0W]
- RGC of the Hong Kong Government [PolyU 5281.08]
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A fiber-optic vibration sensing system that uses a tilted fiber Bragg grating (TFBG) and a vertical-cavity surface-emitting laser (VCSEL) has been demonstrated. The backward-propagating low-order cladding modes excited by the TFBG can be effectively recoupled to the fiber core via a lateral-offset-splice upstream the TFBG and the amount of recoupling varies strongly with fiber curvature, providing the sensing mechanism. VCSEL with matched wavelength enables the recoupling to work at a high power level and an improved optical signal-to-noise ratio better than 40 dB is achieved. Meanwhile, VCSEL provides a high-speed continuous wavelength tuning over 1 similar to 2 nm which perfectly covers the strongest recoupling band, making the demodulation filter unnecessary. Dynamic vibration measurement up to 200 Hz has been achieved via cost-effective normalized power detection.
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