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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 Step-index profile ： ウィキペディア英語版 Step-index profile For an optical fiber, a step-index profile is a refractive index profile characterized by a uniform refractive index within the core and a sharp decrease in refractive index at the core-cladding interface so that the cladding is of a lower refractive index. The step-index profile corresponds to a power-law index profile with the profile parameter approaching infinity. The step-index profile is used in most single-mode fibers〔(【引用サイトリンク】title=SINGLE MODE STEP-INDEX FIBERS )〕 and some multimode fibers.〔(【引用サイトリンク】title=Fiber Optics Overview )〕 A step-index fiber is characterized by the core and cladding refractive indices ''n1'' and ''n2'' and the core and cladding radii a and b. Examples of standard core and cladding diameters 2a/2b are 8/125, 50/125, 62.5/125, 85/125, or 100/140 (units of µm). The fractional refractive-index change $\backslash triangle\; \backslash ,\; =\; \backslash frac\; \backslash ll\; \backslash \; 1$. The value of n1 is typically between 1.44 and 1.46, and $\backslash triangle$ is typically between 0.001 and 0.02. Step-index optical fiber is generally made by doping high-purity fused silica glass (SiO2) with different concentrations of materials like titanium, germanium, or boron. Pulse dispersion in a step index optical fiber is given by $\backslash text\; =\; \backslash frac\backslash ,\backslash !$ where $\backslash triangle\backslash ,\backslash !$ is the difference in refractive indices of core and cladding. $n\_1\backslash ,\backslash !$ is the refractive index of core $\backslash ell\backslash ,\backslash !$ is the length of the optical fiber under observation $c\; =\; 3\; \backslash times\; 10^8\backslash ,\backslash mathrm^\; \backslash ,\backslash !$ ==See also== *Graded-index fiber *Critical Angle *Numerical aperture 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「Step-index profile」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.