作者: Takashi c , O Fujitsu Limited Fujiwara , o Fujitsu Limited Miyazaki , Haruo C
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摘要: Disclosed is an optical amplification repeating system having at least one repeater (40) disposed in the middle of transmission line (20, 30) connecting two terminal stations (60, 70) which a light beam output from amplifier (1-1) split into beams, beams converted electric signal by optical/electrical conversion (4-1), and signal-to-noise ratio detected on basis signal. With such arrangement, can be measured in-service state, i.e., while operation.