发明名称 |
Disk shaped tunable optical filter |
摘要 |
<p>A reference wavelength light generation apparatus, comprising: a single mode wavelength tunable semiconductor laser light source; a disk shaped optical filter having such a filter characteristic that a transmission central wavelength varies linearly with respect to a rotation angle, through which optical beams from the light source pass; and a servo motor for rotating the disk shaped optical filter in synchronization with a clock; and a control circuit for detecting an error between an oscillation wavelength of the light source and a specified wavelength, and generating a negative feed-back control signal to control the light source so as to cancel out the error. <IMAGE></p> |
申请公布号 |
EP0911655(A3) |
申请公布日期 |
2001.04.04 |
申请号 |
EP19980119716 |
申请日期 |
1998.10.19 |
申请人 |
NIPPON TELEGRAPH AND |
发明人 |
KATAGIRI, YOSHITADA;TACHIKAWA YOSHIAKI;NAGAOKA, SHINJI;OHIRA, FUMIKAZU;AIDA, KAZUO;SUZUKI, KEN-ICHI;ABE, HIROSHI;KAWAI, SHINGO;OBARA,HITOSHI |
分类号 |
G02B6/34;G02B7/00;G02B26/00;G02B27/44;(IPC1-7):G02B5/20;G02B5/22;G02B5/28 |
主分类号 |
G02B6/34 |
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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