发明名称 |
An optical amplifier and an optical amplification method |
摘要 |
Two rare earth-doped optical fibers are connected in series and used to amplify input light. A splitter is installed between these two rare earth-doped optical fibers. The input light is monitored by having the portion of the input light that is branched off by the splitter received by a photodiode. Excitation light output from a laser light source is guided by optical couplers and supplied to the above rare earth-doped optical fibers. A control circuit controls the output light level and, at the same time, stops the output from the laser light source when the input light level drops below a specified threshold value. The gain of the first stage rare earth-doped optical fiber while excitation light is being supplied is larger than the loss that occurs due to branching of the input light by the splitter. |
申请公布号 |
GB2317044(B) |
申请公布日期 |
2001.07.04 |
申请号 |
GB19970006435 |
申请日期 |
1997.03.27 |
申请人 |
* FUJITSU LIMITED |
发明人 |
HIDEAKI * SUGIYA;YOSHIHITO * ONODA |
分类号 |
H01S3/07;H01S3/06;H01S3/067;H01S3/10;H01S3/131;(IPC1-7):H01S3/06;H04B10/17 |
主分类号 |
H01S3/07 |
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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