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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 10 — May. 15, 2013
  • pp: 1666–1668

Temperature insensitive high-precision refractive-index sensor using two concatenated dual-resonance long-period gratings

Saurabh Mani Tripathi, Wojtek J. Bock, Arun Kumar, and Predrag Mikulic  »View Author Affiliations

Optics Letters, Vol. 38, Issue 10, pp. 1666-1668 (2013)

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In this Letter we report on fabricating and analyzing a temperature insensitive refractometer based on two concatenated dual-resonance long-period gratings (LPGs) with an appropriate inter-grating space (IGS) in between. The IGS provides a temperature-dependent extra phase difference between the core and cladding modes, making the refractometer similar to a Mach–Zehnder interferometer with its arms phase shifted. We demonstrate that an appropriate IGS can produce temperature-insensitive resonance wavelengths. The interferometer is highly stable over a wide range of temperature (20°C–100°C). The measured refractive index sensitivity for aqueous solutions (1.333–1.343) is 2583nm/RIU, which is the highest reported so far for biological samples. The interferometer can be used for various other temperature-immune sensing applications also.

© 2013 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: February 25, 2013
Revised Manuscript: April 11, 2013
Manuscript Accepted: April 12, 2013
Published: May 10, 2013

Saurabh Mani Tripathi, Wojtek J. Bock, Arun Kumar, and Predrag Mikulic, "Temperature insensitive high-precision refractive-index sensor using two concatenated dual-resonance long-period gratings," Opt. Lett. 38, 1666-1668 (2013)

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