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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 4 — Feb. 19, 2007
  • pp: 1804–1810

Effect of macro-bending on resonant wavelength and intensity of long-period gratings in photonic crystal fiber

Zonghu He, Yinian Zhu, and Henry Du  »View Author Affiliations

Optics Express, Vol. 15, Issue 4, pp. 1804-1810 (2007)

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We report the spectral characteristics of CO2-laser inscribed long-period gratings (LPGs) in endlessly single mode photonic crystal fiber (PCF) subject to macro-bending. The coupling modes as a result of bending were studied by examining the shifts of resonant wavelengths, the splits of attenuation bands, and the variation in coupling strength of the transmission spectra. A bending coefficient of ~ 27.9 nm∙m was determined in the PCF at 180° rotational orientation relative to the point of laser inscription in the curvature range from 2.6 m-1 to 3.5 m-1. Compared with conventional fiber LPGs fabricated using the same method, the PCF-based LPGs possess higher sensitivity both to bending and orientation, making them promising for sensor applications.

© 2007 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.2370) Fiber optics and optical communications : Fiber optics sensors

ToC Category:
Photonic Crystal Fibers

Original Manuscript: September 18, 2006
Revised Manuscript: February 6, 2007
Manuscript Accepted: February 7, 2007
Published: February 19, 2007

Zonghu He, Yinian Zhu, and Henry Du, "Effect of macro-bending on resonant wavelength and intensity of long-period gratings in photonic crystal fiber," Opt. Express 15, 1804-1810 (2007)

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