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

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Title: Detailed theoretical investigation of bending properties in solid-core photonic bandgap fibers
Authors: Murao, Tadashi Browse this author
Saitoh, Kunimasa Browse this author →KAKEN DB
Koshiba, Masanori Browse this author →KAKEN DB
Issue Date: 27-Apr-2009
Publisher: Optical Society of America
Journal Title: Optics Express
Volume: 17
Issue: 9
Start Page: 7615
End Page: 7629
Abstract: 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. (C) 2009 Optical Society of America
Rights: © 2009 Optical Society of America, Inc.
Type: article
URI: http://hdl.handle.net/2115/38626
Appears in Collections:情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 村尾 覚志

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