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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 9 — Apr. 27, 2009
  • pp: 7615–7629

Detailed theoretical investigation of bending properties in solid-core photonic bandgap fibers

Tadashi Murao, Kunimasa Saitoh, and Masanori Koshiba  »View Author Affiliations

Optics Express, Vol. 17, Issue 9, pp. 7615-7629 (2009)

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In this paper, detailed properties of bent solid-core photonic bandgap fibers (SC-PBGFs) are investigated. We propose an approximate equivalent straight waveguide (ESW) formulation for photonic bandgap (PBG) edges, which is convenient to see qualitatively which radiation (centripetal or centrifugal radiation) mainly occurs and the impact of bend losses for an operating wavelength. In particular, we show that cladding modes induced by bending cause several complete or incomplete leaky mode couplings with the core mode and the resultant loss peaks. Moreover, we show that the field distributions of the cladding modes are characterized by three distinct types for blue-edge, mid-gap, and red-edge wavelengths in the PBG, which is explained by considering the cladding Bloch states or resonant conditions without bending. Next, we investigate the structural dependence of the bend losses. In particular, we demonstrate the bend-loss dependence on the number of the cladding rings. Finally, by investigating the impacts of the order of PBG and the core structure on the bend losses, we discuss a tight-bending structure.

© 2009 Optical Society of America

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2400) Fiber optics and optical communications : Fiber properties
(060.5295) Fiber optics and optical communications : Photonic crystal fibers

ToC Category:
Photonic Crystal Fibers

Original Manuscript: March 9, 2009
Revised Manuscript: April 16, 2009
Manuscript Accepted: April 19, 2009
Published: April 23, 2009

Tadashi Murao, Kunimasa Saitoh, and Masanori Koshiba, "Detailed theoretical investigation of bending properties in solid-core photonic bandgap fibers," Opt. Express 17, 7615-7629 (2009)

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