- 专利标题: Control method and device for optical filter
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申请号: US10265767申请日: 2002-10-08
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公开(公告)号: US07120321B2公开(公告)日: 2006-10-10
- 发明人: Hideyuki Miyata , Yutaka Kai , Isao Tsuyama
- 申请人: Hideyuki Miyata , Yutaka Kai , Isao Tsuyama
- 申请人地址: JP Kawasaki
- 专利权人: Fujitsu Limited
- 当前专利权人: Fujitsu Limited
- 当前专利权人地址: JP Kawasaki
- 代理机构: Staas & Halsey LLP
- 优先权: JP2001-399218 20011228
- 主分类号: G02F1/335
- IPC分类号: G02F1/335
摘要:
The present invention relates to a control method and device for an optical filter, and a primary object of the present invention is to achieve accurate tracking control of the optical filter. Disclosed herein is a control method for an optical filter including first and second optical filter units cascaded, each having an input and first and second outputs. The first output of the first optical filter unit is connected to the input of the second optical filter unit. First light output from the second output of the first optical filter unit is converted into a first electrical signal having a level corresponding to the power of the first light, and second light output from the second output of the second optical filter unit is converted into a second electrical signal having a level corresponding to the power of the second light. A control signal is generated according to the first and second electrical signals. Then, the first and second optical filter units are controlled according to the control signal. According to this method, accurate tracking control of the optical filter can be achieved.
公开/授权文献
- US20030123775A1 Control method and device for optical filter 公开/授权日:2003-07-03