发明授权
- 专利标题: Method and system for selective optical payload cancellation
- 专利标题(中): 用于选择性光学有效载荷取消的方法和系统
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申请号: US10635561申请日: 2003-08-07
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公开(公告)号: US07224909B2公开(公告)日: 2007-05-29
- 发明人: Derrick Remedios , Benjamin Wai Chan , Patrick Chilufya Chimfwembe , Ping Wai Wan
- 申请人: Derrick Remedios , Benjamin Wai Chan , Patrick Chilufya Chimfwembe , Ping Wai Wan
- 申请人地址: CA Kanata, Ontario
- 专利权人: Tropic Networks Inc.
- 当前专利权人: Tropic Networks Inc.
- 当前专利权人地址: CA Kanata, Ontario
- 代理商 Victoria Donnelly
- 主分类号: H04B10/04
- IPC分类号: H04B10/04
摘要:
The invention provides a method and system for selectively canceling a specified frequency band in the payload of an optical communication system. This selected frequency band is to be used for launching pilot tones for power measurement and identification. The method controls the intensity of the optical payload signal through an intensity modulator that is included in the optical communication system. The frequency band in payload to be cancelled is removed where as the other frequency components of the payload are passed without attenuation. An embodiment that uses a feed-forward unit, a feedback unit and a control unit for generating a cancellation signal for the intensity modulator is described. An advantage of the method is that it removes a continuum of payload tones in the specified frequency band to be cancelled.