发明名称 |
Optical transmission system |
摘要 |
In each node of an optical transmission system: an optical preamplifier has an ALC function for maintaining an optical output level constant and an AGC function for maintaining the gain constant; the operational mode of the optical preamplifier is changed from an ALC mode to an AGC mode after the gain is set in the ALC mode; an optical postamplifier has an AGC function; an optical switch unit performs an optical crossconnect operation; and a thru-light-shutoff control unit makes a switch setting so as to shut off pass-through light in the optical switch unit and stop transmission of an optical signal having an unstable level to a next stage when the optical preamplifier operates in the ALC mode, and clears the switch setting when the operational mode of the optical preamplifier is changed to the AGC mode.
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申请公布号 |
US2004005152(A1) |
申请公布日期 |
2004.01.08 |
申请号 |
US20030365427 |
申请日期 |
2003.02.13 |
申请人 |
FUJITSU LIMITED |
发明人 |
HORACHI KAZUNORI;ASAO TARO;TANAKA KAZUO;NEMOTO NOBUYUKI;MATSUMOTO HIROYUKI;TANIGUCHI MIWA;SUZUKI TOSHIHIRO;SUZUKI MANABU |
分类号 |
H04B10/02;H04B10/04;H04B10/06;H04B10/14;H04B10/17;H04J14/02;(IPC1-7):H04J14/02 |
主分类号 |
H04B10/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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