发明授权
- 专利标题： Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of channels are varied
- 专利标题（中）： 当频道数量变化时，控制可变光衰减器以控制波分复用光信号的功率电平的控制器
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申请号： US12328266申请日： 2008-12-04
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公开(公告)号： US07969649B2公开(公告)日： 2011-06-28
- 发明人: Yasushi Sugaya , Susumu Kinoshita
- 申请人： Yasushi Sugaya , Susumu Kinoshita
- 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： JP8-111447 19960502
- 主分类号： H04B10/17
- IPC分类号： H04B10/17 ; H04B10/12
摘要：
An optical amplifying apparatus which includes an optical amplifier, an optical attenuator and a controller. The optical amplifier amplifies a light signal having a variable number of channels. The optical attenuator passes the amplified light signal and has a variable light transmissivity. Prior to varying the number of channels in the light signal, the controller varies the light transmissivity of the optical attenuator so that a power level of the amplified light signal is maintained at an approximately constant level that depends on the number of channels in the light signal prior to the varying the number of channels. While the number of channels in the light signal is being varied, the controller maintains the light transmissivity of the optical attenuator to be constant. Subsequent to varying the number of channels in the light signal, the controller varies the light transmissivity of the optical attenuator so that a power level of the amplified light signal is maintained at an approximately constant level that depends on the number of channels in the light signal subsequent to the varying the number of channels.
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