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Optics Letters

Optics Letters


  • Vol. 37, Iss. 13 — Jul. 1, 2012
  • pp: 2649–2651

Bragg gratings in rectangular microfiber for temperature independent refractive index sensing

Yang Ran, Long Jin, Li-Peng Sun, Jie Li, and Bai-Ou Guan  »View Author Affiliations

Optics Letters, Vol. 37, Issue 13, pp. 2649-2651 (2012)

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We present fiber Bragg grating fabricated in rectangular microfiber for temperature-independent refractive index (RI) measurement. The grating has two Bragg peaks due to the high geometrical birefringence of the rectangular microfiber. The two peaks present different RI responses because the modes along the orthogonal polarizations have different energy fractions in terms of evanescent field outside the silica microfiber and hence the light/liquid interaction strength are different. In contrast, they exhibit identical temperature sensitivities because most mode energy is confined in the microfiber and the thermal-optic effect of silica dominantly determines the temperature response. As a result, temperature-independent RI sensing can be realized by monitoring the wavelength separation between the two peaks.

© 2012 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(230.3990) Optical devices : Micro-optical devices
(260.1440) Physical optics : Birefringence
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: April 11, 2012
Revised Manuscript: May 17, 2012
Manuscript Accepted: May 18, 2012
Published: June 25, 2012

Yang Ran, Long Jin, Li-Peng Sun, Jie Li, and Bai-Ou Guan, "Bragg gratings in rectangular microfiber for temperature independent refractive index sensing," Opt. Lett. 37, 2649-2651 (2012)

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