Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/5801
Title: Highly sensitive bending sensor based on Er³⁺-doped DBR fiber laser
Authors: Lu, W
Guo, T
Wong, ACL
Tam, HY 
He, S
Keywords: Erbium
Fiber lasers
Laser optics
Polarization
Sensors
Temperature distribution
Issue Date: 16-Aug-2010
Publisher: Optical Society of America
Source: Optics express, 16 Aug. 2010, v. 18, no. 17, p. 17834-17840 How to cite?
Journal: Optics express 
Abstract: A short cavity Er³⁺-doped distributed-Bragg-reflector (DBR) fiber laser with a low polarization beat frequency has been demonstrated for bending measurement. The polarization beat frequency of the DBR laser is extremely sensitive to bending and can measure curvature changes as small as 1.8 × 10⁻² m⁻¹. Excellent agreement between experimental and theoretical results was obtained for bending curvatures from 0 m⁻¹ to 58.8 m⁻¹ with corresponding changes in beat frequency from 18.6 MHz to 253 MHz. The sensor is insensitive to temperature fluctuations and has a temperature coefficient of the beat frequency of -25.4 kHz/°C, making the temperature compensation unnecessary in most practical applications. The very low beat frequency of the DBR fiber laser makes frequency downconversion unnecessary. This can greatly simplify the demodulation scheme and thus, allow the realization of low-cost but highly sensitive optical bending sensor systems.
URI: http://hdl.handle.net/10397/5801
EISSN: 1094-4087
DOI: 10.1364/OE.18.017834
Rights: © 2010 Optical Society of America. This paper was published in Optics express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?URI=oe-18-17-17834. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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