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Design of graded index type photonic crystal fiber having α-power air hole diameter distribution with α < 1 for fiber collimator application

  • Special Section: Regular Paper
  • The 11th International Conference on Optics-Photonics Design & Fabrication (ODF’18), Hiroshima, Japan
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Abstract

A graded-index type photonic crystal fiber (GI-PCF) that has α-power air hole diameter distribution in radial direction has a characteristic that the beam diameter varies periodically along the propagation direction in the Gaussian beam excited GI-PCF, and it is similar to a GI type multimode fiber (GI-MMF). Since GI-MMFs are used as fiber collimators, it is considered that GI-PCFs are also possible to apply for fiber collimators. However, it is difficult to draw fiber with air hole diameter control in considering higher coupling efficiency at \(1 \le \alpha \le 2\). In this paper, we theoretically analyzed light propagation characteristics in Gaussian beam excited GI-PCF having α-power air hole diameter distribution with α < 1 and investigated the coupling efficiency with conventional PCF and its wavelength characteristics. It was found that the coupling efficiency became larger as the air hole diameter d was smaller at α < 1. In particular, a better tolerance for fiber length error and wavelength characteristics were obtained at α = 1/2. From these results and the difficulty of GI-PCF drawing, we designed the suitable structure of GI-PCF for fiber collimator application.

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Acknowledgements

This work was supported by JSPS KAKENHI Grant Number JP16K06292.

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Authors and Affiliations

  1. Graduate School of Science and Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, 316-8511, Ibaraki, Japan

    Mizuki Wakabayashi, Hirohisa Yokota & Yoh Imai

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  1. Mizuki Wakabayashi
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  2. Hirohisa Yokota
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  3. Yoh Imai
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Correspondence to Hirohisa Yokota.

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Wakabayashi, M., Yokota, H. & Imai, Y. Design of graded index type photonic crystal fiber having α-power air hole diameter distribution with α < 1 for fiber collimator application. Opt Rev 26, 460–465 (2019). https://doi.org/10.1007/s10043-019-00532-4

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  • DOI: https://doi.org/10.1007/s10043-019-00532-4

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