专利检索 ap:("FUJITSU LIMITED") AND inv:"Terahara, Takafumi, Fujitsu Ltd.1-1Kamikodanaka" 第 1 页

1.

发明公开
Method and apparatus for measuring optical signal-to-noise ratio, and pre-emphasis method, in an optical communication system 审中-公开
标题翻译：用于测量的光传输系统的光信噪比，和方法，用于预失真的方法和装置

公开(公告)号：EP1130803A3

公开(公告)日：2004-04-14

申请号：EP00124366.6

申请日：2000-11-20

申请人： FUJITSU LIMITED

发明人： Sakamoto, Takeshi , Tomofuji, Hiroaki , Onaka, Hiroshi , Sekiya, Motoyoshi , Murakami, Makoto, Fujitsu Hokkaido Dig. Tech. Ltd. , Yamane Kazuo, c/o Fujitsu Ltd. , Terahara, Takafumi, Fujitsu Ltd.1-1Kamikodanaka

IPC分类号： H04B10/08 , H04B10/17

CPC分类号： H04B10/07953 , H04B10/0799

摘要： In a method of measuring an optical signal-to-noise ratio according to the present invention, a partial optical signal-to-noise ratio is defined, the partial optical signal-to-noise ratio is calculated from a predetermined physical quantity, the sum of inverse numbers of the partial optical signal-to-noise ratios is calculated, and further an inverse number of the sum is calculated to acquire an optical signal-to-noise ratio. The present invention makes it possible to measure optical SNR without directly measuring ASE in the optical signal. The present invention provides a measuring apparatus, a measuring circuit, a pre-emphasis method, an optical communication system, and a controlling apparatus each utilizing this method.