| 发明名称 |
MODULATION INDEX MEASUREMENT SYSTEM IN LIGHT DIRECT MODULATION PSK SYSTEM AND METHOD FOR CONTROLLING SEMICONDUCTOR LASER USING IT |
| 摘要 |
PURPOSE:To enable a modulation index to be measured easily. CONSTITUTION:An intermediate frequency signal obtained by detecting what is obtained by superposing a signal light modulated by the PSK system with a local oscillation light is doubled by a frequency doubler 5 and is fed to a frequency analyzer 6, thus obtaining a modulation index based on a frequency difference of large two frequency components which appear at the frequency analyzer 6. |
| 申请公布号 |
JPH0526736(A) |
申请公布日期 |
1993.02.02 |
| 申请号 |
JP19910177916 |
申请日期 |
1991.07.18 |
| 申请人 |
FUJITSU LTD |
发明人 |
NAITO TAKAO;CHIKAMA TERUMI;ONAKA HIROSHI;MIYATA HIDEYUKI |
| 分类号 |
G01J9/00;G02F2/00;H01L21/66;H01S5/06;H04B10/07;H04B10/079;H04B10/556;H04B10/564;H04L27/18 |
主分类号 |
G01J9/00 |
| 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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