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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 34, Iss. 12 — Jun. 15, 2009
  • pp: 1861–1863

Photonic bandgap fiber tapers and in-fiber interferometric sensors

Jian Ju, Lina Ma, Wei Jin, and Yongming Hu  »View Author Affiliations

Optics Letters, Vol. 34, Issue 12, pp. 1861-1863 (2009)

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Nonadiabatic tapers in hollow-core air–silica photonic bandgap fibers (PBFs) were fabricated by the use of a fiber fusion splicer. In addition to the well-known scaling down of fiber dimensions, the innermost rings of air holes were found collapsed or significantly deformed, which results in almost doubling the diameter of the hollow core in the tapered region. The tapering of the PBF causes coupling of the fundamental core mode to a surface mode with 10 % higher effective mode index. An in-fiber core–surface mode interferometer was constructed by cascading two such tapers along the PBF. The interferometer was experimentally demonstrated for strain and temperature measurement, and the sensitivities of the interferometric peak wavelength to strain and temperature are measured to be 0.64   pm / μ ε and 495.6   pm / ( ° C   m ) , respectively.

© 2009 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2370) Fiber optics and optical communications : Fiber optics sensors

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: April 8, 2009
Revised Manuscript: May 12, 2009
Manuscript Accepted: May 12, 2009
Published: June 11, 2009

Jian Ju, Lina Ma, Wei Jin, and Yongming Hu, "Photonic bandgap fiber tapers and in-fiber interferometric sensors," Opt. Lett. 34, 1861-1863 (2009)

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