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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 13 — Jun. 30, 2014
  • pp: 15697–15709

Multi-phase-shifted helical long period fiber grating based temperature-insensitive optical twist sensor

R. Gao, Y. Jiang, and L. Jiang  »View Author Affiliations

Optics Express, Vol. 22, Issue 13, pp. 15697-15709 (2014)

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A compact temperature-insensitive optical fiber twist sensor based on multi-phase-shifted helical long period fiber grating has been proposed and experimentally demonstrated in this paper. A multi-phase-shifted helical long period fiber grating is fabricated with a multi-period rotation technology. A π/2 and a 3π/2 phase shift is introduced in the helical long period fiber grating by changing the period. The helical pitch can be effectively changed with a different twist rate, which is measured by calculating the wavelength difference between two phase shift peaks. Although the wavelength of the phase shift peak also shifts with a change of the temperature, the wavelength difference between two phase shift peaks is constant due to two fixed phase shifts in the helical long period fiber grating, which is extremely insensitive to temperature change for the multi-phase-shifted helical long period fiber grating. The experimental results show that a sensitivity of up to 1.959 nm/(rad/m) is achieved.

© 2014 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(230.1150) Optical devices : All-optical devices

ToC Category:

Original Manuscript: April 21, 2014
Revised Manuscript: June 12, 2014
Manuscript Accepted: June 15, 2014
Published: June 19, 2014

R. Gao, Y. Jiang, and L. Jiang, "Multi-phase-shifted helical long period fiber grating based temperature-insensitive optical twist sensor," Opt. Express 22, 15697-15709 (2014)

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