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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 3 — Feb. 1, 2012
  • pp: 380–382

Numerical and experimental investigation of long-period gratings in photonic crystal fiber for refractive index sensing of gas media

Fei Tian, Zonghu He, and Henry Du  »View Author Affiliations

Optics Letters, Vol. 37, Issue 3, pp. 380-382 (2012)

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We have used the finite-difference frequency-domain (FDFD) method to simulate the core mode to cladding mode couplings in long-period gratings (LPGs) in photonic crystal fiber (PCF). Four sets of LPG-PCF have been fabricated with respective periodicities of 590, 540, 515, and 490μm, resulting in corresponding resonance wavelengths (RWs) of 1241, 1399, 1494, and 1579 nm. We show both theoretically and experimentally that the longer the RW, the more sensitive the LPG-PCF is to the index change in Ar. We demonstrate a robust sensitivity of 517 nm per refractive index unit using the LPG-PCF at 1579 nm RW.

© 2012 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.5295) Fiber optics and optical communications : Photonic crystal fibers

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: June 20, 2011
Revised Manuscript: November 30, 2011
Manuscript Accepted: December 5, 2011
Published: January 30, 2012

Fei Tian, Zonghu He, and Henry Du, "Numerical and experimental investigation of long-period gratings in photonic crystal fiber for refractive index sensing of gas media," Opt. Lett. 37, 380-382 (2012)

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