发明名称 |
Optical attenuator including dual control loops |
摘要 |
The present invention provides an optical attenuator (200) comprising an optical attenuator module (210), an optical splitter (220), a detector (240) and a control unit (250). Input radiation (Pi) is received at the attenuator module (210) which is operable to attenuate the input radiation to generate corresponding attenuated radiation (Po). The detector (240) is operable to receive a portion of the attenuated radiation (0.1Po) and generate a corresponding electrical signal T1. The signal T1 is applied by the control unit (250) via a first feedback loop (262) to regulate the attenuator module (210) so that radiation power of the attenuated radiation is maintained to a predetermined level. In a situation where an interruption of the input radiation (P;) occurs, the control unit (250) is operable to monitor temperature of the attenuator module (210) using a thermistor sensor (280) and to regulate the temperature of the module (210) using a second feedback loop (264) to a predetermined temperature during the interruption. On termination of the interruption, control of the attenuator module (210) is transferred back to the first feedback loop (262) to maintain the attenuated radiation to the predetermined level. <IMAGE> |
申请公布号 |
GB2360602(B) |
申请公布日期 |
2002.05.01 |
申请号 |
GB20000006939 |
申请日期 |
2000.03.23 |
申请人 |
* MARCONI COMMUNICATIONS LIMITED |
发明人 |
ROGER WARWICK * BROWN;EARL ANTHONY * DENNIS |
分类号 |
G02F1/01;H01S3/06;H01S3/10;H04B10/16;H04B10/17;(IPC1-7):G02F1/01;H04J14/02 |
主分类号 |
G02F1/01 |
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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