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Chitose, Japan

The Chitose Institute of Science and Technology is a technical university in Chitose, Hokkaido, Japan. It was established in 1998. Wikipedia.


Karasawa N.,Chitose Institute of Science and Technology
Applied Optics | Year: 2012

Dispersion properties of liquid-core photonic crystal fibers (PCFs) with large air fraction in clads between 300 to 2000 nm have been calculated by a multipole method for various liquids including CS2, toluene, chloroform, and water for different core diameters. In calculations, air holes are assumed to be arranged in a regular hexagonal array in fused silica, and a central hole is filled with liquid to create a core. The results are compared with those obtained by a fully vectorial effective index method, and fitting parameters for core sizes are found for each liquid except for water, where the latter method does not give correct dispersions at short wavelengths. Also, the power ratios inside liquid cores and effective core areas were calculated at different wavelengths. © 2012 Optical Society of America. Source


Eguchi M.,Chitose Institute of Science and Technology
Journal of the Optical Society of America B: Optical Physics | Year: 2010

A multistep-index (MSI) plastic optical fiber (POF) has been intensively studied as an alternative to highbandwidth graded-index (GI) POFs during the past decade. The propagation modes in MSI POFs are more complicated than those of GI POFs. We obtain all the propagation modes in MSI large-core highly multimode fibers with a core diameter of 500 μm by the use of a finite-element method and demonstrate that many modes in MSI fibers have anomalous behavior which cannot be observed in power-law profile fibers. Our numerical results elucidate detailed transmission properties of MSI large-core highly multimode fibers, including the effective index, group delay, mode field, root-mean-square pulse width, and bandwidth. © 2010 Optical Society of America. Source


Zhang Z.,Muroran Institute of Technology | Tsuji Y.,Muroran Institute of Technology | Eguchi M.,Chitose Institute of Science and Technology
IEEE Photonics Technology Letters | Year: 2014

We propose a novel polarization splitter based on coupled elliptical-hole core circular-hole holey fibers (EC-CHFs). Utilizing the single-polarization nature of the EC-CHFs, in the proposed polarization splitter, two orthogonally polarized waves couple only to different EC-CHFs and the crosstalkfree polarization splitting is realized. In addition, the coupling length for two orthogonally polarized waves can be independently designed and this splitter is easy to design. © 2014 IEEE. Source


Eguchi M.,Chitose Institute of Science and Technology | Tsuji Y.,Muroran Institute of Technology
Journal of the Optical Society of America B: Optical Physics | Year: 2013

When the mode field and refractive index mismatches between two spliced fibers are small, the splice loss is generally evaluated by calculating an overlap integral without reflection waves. A single-polarization circular-hole holey fiber with a core consisting of an elliptical-hole lattice (EC-CHF) has a strikingly different mode field caused by elliptical holes in the core region from those of conventional single-mode fibers (SMFs), and thus reflected radiation modes may significantly appear in splicing an EC-CHF to conventional SMFs. We study the influence of reflected radiation modes on the splice loss evaluation of optical fibers with large mode field and large refractive index mismatches through numerical analyses using a bidirectional eigenmode propagation method and a three-dimensional finite-element method. © 2013 Optical Society of America. Source


Eguchi M.,Chitose Institute of Science and Technology | Tsuji Y.,Muroran Institute of Technology
Journal of Lightwave Technology | Year: 2013

In photonic bandgap (PBG) fibers, light is confined by a photonic bandgap caused by a periodic structure of air holes in the cladding regions. The doubly degenerate fundamental mode in ideal PBG fiber structures becomes slightly nondegenerate in actually produced fibers, and this causes polarization instability and polarization mode dispersion. Here, to avoid these problems, we propose a novel absolutely single-polarization PBG fiber structure with an elliptical-hole lattice core. A PBG fiber with a single-polarization bandwidth of 420 nm is numerically demonstrated. Furthermore, based on the proposed fiber structure, we report another single-polarization PBG fiber that has two absolutely single-polarization bands being orthogonal to each other. © 2012 IEEE. Source

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