| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical communication system and a remote exciting light amplifier module, in which high-quality signal beam transmission is performed. <P>SOLUTION: A signal beam that is sent from a certain communication station, is transmitted by an optical transmission line and reaches another communication station. The signal beam is optically amplified by EDFs 161-163 in a relay optical amplifier 100 which is provided in the communication station, and is lost by a variable optical attenuator 170 of which a transmission loss spectrum is variable. The signal beam is also optically amplified by a remote exciting light amplifier module which is provided on the optical transmission line. The transmission loss spectrum of the variable optical attenuator 170 is controlled by a control circuit 200 based on a result of monitoring a level of the signal beam and another result of monitoring (appropriately a result of monitoring a level of monitoring light propagated by a transmission optical fiber for propagating the signal beam). <P>COPYRIGHT: (C)2005,JPO&NCIPI |
