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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 6 — Mar. 12, 2012
  • pp: 6021–6028

Strain-insensitive temperature sensing with a dual polarization fiber grating laser

Long Jin, Yan-Nan Tan, Zhan Quan, Meng-Ping Li, and Bai-Ou Guan  »View Author Affiliations


Optics Express, Vol. 20, Issue 6, pp. 6021-6028 (2012)
http://dx.doi.org/10.1364/OE.20.006021


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Abstract

In this paper, a strain-insensitive temperature sensor based on a dual polarization fiber grating laser is demonstrated. The laser is fabricated by inscribing two wavelength-matched Bragg gratings in an Er-doped fiber. It emits single-longitudinal-mode output in wavelength domain and generates a RF-domain signal as a beat note between the two polarization modes. A temperature sensor has been exploited by monitoring the beat frequency. The measured temperature sensitivity is −78.46 kHz/°C. Theoretical analysis suggests that the temperature response is a result of both the differences in thermo-optic coefficient and thermal expansion between the core and cladding. In contrast, the sensor is almost insensitive to applied axial strain. We found that the strain insensitivity is due to the compensation between the strain-induced birefringence change and the effect of the elongation/material index change. The proposed sensor can be applied for reliable and precise measurement of temperature independently, towards the applications in structural integrity, oil-well monitoring, aerospace engineering, and process control.

© 2012 OSA

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings
(060.2840) Fiber optics and optical communications : Heterodyne
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: January 19, 2012
Revised Manuscript: February 18, 2012
Manuscript Accepted: February 20, 2012
Published: February 27, 2012

Citation
Long Jin, Yan-Nan Tan, Zhan Quan, Meng-Ping Li, and Bai-Ou Guan, "Strain-insensitive temperature sensing with a dual polarization fiber grating laser," Opt. Express 20, 6021-6028 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-6-6021


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