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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Graded-index fiber ： ウィキペディア英語版 Graded-index fiber In fiber optics, a graded-index or gradient-index fiber is an optical fiber whose core has a refractive index that decreases with increasing radial distance from the optical axis of the fiber. Because parts of the core closer to the fiber axis have a higher refractive index than the parts near the cladding, light rays follow sinusoidal paths down the fiber. The most common refractive index profile for a graded-index fiber is very nearly parabolic. The parabolic profile results in continual refocusing of the rays in the core, and minimizes modal dispersion. Multi-mode optical fiber can be built with either graded index or step index. The advantage of the multi-mode graded index compared to the multi-mode step index is the considerable decrease in modal dispersion. Modal dispersion can be further decreased by selecting a smaller core size (less than 5-10μm) and forming a single mode step index fiber. This type of fiber is normalized by the International Telecommunications Union ITU-T at recommendation G.651.1. ==Pulse dispersion== Pulse dispersion in a graded index optical fiber is given by $\backslash mathrm\; =\; \backslash frac\; \backslash ,\backslash !,$     where $\backslash delta\; n\backslash ,\backslash !$ is the difference in refractive indices of core and cladding, $n\_1\backslash ,\backslash !$ is the refractive index of the cladding, $l\backslash ,\backslash !$ is the length of the fiber taken for observing the pulse dispersion, $c\; \backslash approx\; 3\backslash times\; 10^8~\backslash mathrm\backslash ,\backslash !$ is the speed of light, and $k\backslash ,\backslash !$ is the constant of graded index profile. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Graded-index fiber」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.