個別研究テーマ編集

光機能物質
教授 大石泰丈

掲載年度

2020

個別研究テーマ
(日本語)

広帯域光パラメトリック増幅用高非線形光ファイバの波長分散ゆらぎの抑制(Suppressing chromatic dispersion fluctuation for broadband optical parametric gain in highly nonlinear tellurite microstructured optical fibers)[大学間連携等による共同研究]

個別研究テーマ
(英語)

研究者 トウン ホアン トアン
鈴木健伸
大石泰丈
研究概要

Fiber-based optical parametric amplification (FOPA) is one of typical applications of four-wave-mixing (FWM) in highly nonlinear optical fibers which can transfer energy from one or two strong pump fields to a weak signal field and generate a new idler field. Since FOPA can provide broad gain bandwidths and high signal gain in many spectral bands where other types of optical amplifier cannot reach, it has been exploited for various applications such as signal amplification, wavelength conversion, phase-conjugation, slow and fast lights, optical signal processing and biomedical applications. However, high efficiency of FOPA performance is not easy to be obtained. It requires suitable pump sources, optical fibers with high nonlinearity and appropriate designs of chromatic dispersion which can satisfy the phase-matching condition. One of important technical issues for FOPA performance is that phase-matching condition for FWM in optical fibers is very sensitive to the fluctuation of chromatic dispersion which is caused by the fiber transverse geometry variation. A new fiber structure has been reported to suppress the chromatic dispersion fluctuation for silica fiber on the supposition that only the core diameter varies along the fiber length.
In this work, we study the suppression of chromatic dispersion fluctuation and the performance of FOPA in a tellurite hybrid microstructured optical fiber (HMOF) with buffer layer by taking into account the variation in the core diameter and fiber transverse geometry. It was shown that tellurite HMOF with buffer layer is more advantageous to suppress the chromatic dispersion fluctuation and to improve the FOPA signal gain and bandwidth than conventional tellurite HMOF without buffer layer. By optimizing the diameters and refractive indices of the core and buffer layer so as to effectively suppress the chromatic dispersion fluctuation, HMOF with buffer layer can be a promising medium to overcome the influence of fiber transverse geometry variation on the performance of FOPA.

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