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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 17 — Aug. 16, 2010
  • pp: 17834–17840

Highly sensitive bending sensor based on Er3+-doped DBR fiber laser

Weisheng Liu, Tuan Guo, Allan Chi-lun Wong, Hwa-Yaw Tam, and Sailing He  »View Author Affiliations

Optics Express, Vol. 18, Issue 17, pp. 17834-17840 (2010)

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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 down-conversion unnecessary. This can greatly simplify the demodulation scheme and thus, allow the realization of low-cost but highly sensitive optical bending sensor systems.

© 2010 OSA

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(260.1440) Physical optics : Birefringence
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:

Original Manuscript: April 8, 2010
Revised Manuscript: June 13, 2010
Manuscript Accepted: June 14, 2010
Published: August 4, 2010

Weisheng Liu, Tuan Guo, Allan Chi-lun Wong, Hwa-Yaw Tam, and Sailing He, "Highly sensitive bending sensor based on Er3+-doped DBR fiber laser," Opt. Express 18, 17834-17840 (2010)

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