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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 Normalized frequency (fiber optics) ： ウィキペディア英語版 Normalized frequency (fiber optics) In an optical fiber, the normalized frequency, ''V'' (also called the V number), is given by :$V\; =\; \backslash sqrt^2\; -\; ^2\}\backslash quad\; =\; \backslash mathrm,$ where ''a'' is the core radius, λ is the wavelength in vacuum, ''n''1 is the maximum refractive index of the core, ''n''2 is the refractive index of the homogeneous cladding, and applying the usual definition of the numerical aperture ''NA''. In multimode operation of an optical fiber having a power-law refractive index profile, the approximate number of bound modes (the mode volume), is given by :$\backslash left(\; \backslash right)\backslash quad,$ where ''g'' is the profile parameter, and ''V'' is the normalized frequency, which must be greater than 5 for the approximation to be valid. For a step index fiber, the mode volume is given by 4''V''2/''π''2. For single-mode operation is required that ''V'' < 2.4048, which is the first root of the Bessel function ''J''0. ==References== * 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「Normalized frequency (fiber optics)」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.