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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 Optical modulation amplitude ： ウィキペディア英語版 Optical modulation amplitude In telecommunications, optical modulation amplitude (OMA) is the difference between two optical power levels, of a digital signal generated by an optical source, ''e.g.,'' a laser diode. It is given by :$\backslash text\; =\; P\_1\; -\; P\_0\; \backslash ,$ where ''P''1 is the optical power level generated when the light source is "on," and ''P''0 is the power level generated when the light source is "off." The OMA may be specified in peak-to-peak mW. The OMA can be related to the average power $P\_\; =\; P\_/P\_$ :$\backslash text\; =\; 2\; P\_-1\}$ In the limit of a high extinction ratio, $\backslash text\; \backslash approx\; 2P\_$. However, OMA is often used to express the effective usable modulation in a signal when the extinction ratio is not high and this approximation may not be valid. ==External links== *(OMA presentation by Optillion, New Orleans, September 2000 ) 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「Optical modulation amplitude」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.