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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 3 — Jan. 30, 2012
  • pp: 2844–2850

Twist sensor based on axial strain insensitive distributed Bragg reflector fiber laser

Jianghai Wo, Meng Jiang, Maxime Malnou, Qizhen Sun, Jiejun Zhang, Perry Ping Shum, and Deming Liu  »View Author Affiliations

Optics Express, Vol. 20, Issue 3, pp. 2844-2850 (2012)

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A novel fiber-optic twist sensor based on a dual-polarization distributed Bragg reflector (DBR) fiber grating laser is proposed and experimentally demonstrated. By beating the signal between the two polarizations of the laser which operates at 1543.154nm, a signal of 30.78MHz in frequency domain is observed. The twist will change the fiber birefringence, and resulting in the beat frequency variation between the two polarization modes from the fiber laser. The result shows the beat frequency shifts as a Sinc function curve with the twist angle and both the measuring curve period and twist sensitivity depend on the twist length of the laser cavity. A high twist sensitivity of 6.68MHz/rad has been obtained at the twist length of 17.5cm. Moreover, the sensor is insensitive to the environmental temperature, as well as strain along the fiber axis with ultralow beat frequency coefficients, making temperature and axial strain compensation unnecessary.

© 2012 OSA

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

ToC Category:

Original Manuscript: December 5, 2011
Revised Manuscript: January 15, 2012
Manuscript Accepted: January 15, 2012
Published: January 23, 2012

Jianghai Wo, Meng Jiang, Maxime Malnou, Qizhen Sun, Jiejun Zhang, Perry Ping Shum, and Deming Liu, "Twist sensor based on axial strain insensitive distributed Bragg reflector fiber laser," Opt. Express 20, 2844-2850 (2012)

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