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1. 发明授权

US06317255B1 Method and apparatus for controlling optical signal power in response to faults in an optical fiber path 失效
标题翻译：响应于光纤路径中的故障来控制光信号功率的方法和装置
公开(公告)号：US06317255B1
公开(公告)日：2001-11-13
申请号：US09067909
申请日：1998-04-28
申请人： Mohammad Taghi Fatehi , Bruce Lee Nelson , Kamal Kumar Raychaudhuri
发明人： Mohammad Taghi Fatehi , Bruce Lee Nelson , Kamal Kumar Raychaudhuri
IPC分类号： H01S330
CPC分类号： H04B10/2931 , H04B10/071 , H04B10/291 , H04B10/2912 , H04B2210/003
摘要： Automatic reduction of optical signal power supplied by an upstream network element by a prescribed amount is achieved by capturing and processing reflected optical energy that is generated within the optical fiber path as a result of a downstream fiber cut, open connector, or other potentially hazardous discontinuity. Generally, the power level of the reflected optical signal is detected and measured in the optical fiber path and the optical signal power supplied by the upstream network element is automatically reduced. The optical signal power may either be reduced by an amount corresponding to the measured reflected optical signal power or may be completely shut off until the faulty condition is resolved. In one illustrative embodiment, an apparatus for automatically reducing or shutting off the optical signal power supplied by an upstream network element includes a directional optical transfer device disposed along the optical fiber path and coupled to the output of a network element, an optical power monitor for measuring the reflected optical energy received via the directional optical coupler as a result of a downstream fiber discontinuity, and control circuitry coupled between the power monitor and the network element to control the optical signal power being supplied by the network element based on the monitored power level of the reflected optical signal. The control circuitry may be analog, digital, or may be implemented using a microprocessor operating under software or firmware program control.
摘要翻译：通过捕获和处理由于下游光纤切断，开放连接器或其他潜在的危险中断而在光纤路径内产生的反射光能量来实现由上游网络提供的光信号功率的自动降低规定量。通常，在光纤路径中检测和测量反射光信号的功率电平，并且由上游网络元件提供的光信号功率自动降低。光信号功率可以减小对应于测量的反射光信号功率的量，或者可以完全关闭，直到故障状况被解决。在一个说明性实施例中，用于自动减少或关闭由上游网络元件提供的光信号功率的装置包括沿着光纤路径设置并耦合到网元的输出的定向光传输装置，用于测量作为下游光纤不连续性的结果通过定向光耦合器接收的反射光能，以及耦合在功率监视器和网络元件之间的控制电路，以基于所监视的功率电平来控制网络元件提供的光信号功率的反射光信号。控制电路可以是模拟的，数字的，或者可以使用在软件或固件程序控制下操作的微处理器来实现。

2. 发明授权

US06519064B1 Scalable add/drop architecture for lightwave communication system 有权
标题翻译：用于光波通信系统的可扩展的分插架构
公开(公告)号：US06519064B1
公开(公告)日：2003-02-11
申请号：US09336543
申请日：1999-06-19
申请人： Mohammad Taghi Fatehi , Bruce Lee Nelson
发明人： Mohammad Taghi Fatehi , Bruce Lee Nelson
IPC分类号： H04J1402
CPC分类号： H04J14/0291 , H04J14/021 , H04J14/0213 , H04J14/0219 , H04J14/0227 , H04J14/0241 , H04J14/0283
摘要： A scalable, reconfigurable, and cost-effective add/drop arrangement is provided which enables a wavelength division multiplexed (WDM) system to be upgraded to accommodate new or changing add/drop requirements without disruptions in existing service. The add/drop arrangement is based on a modular architecture wherein one or more modular optical routing devices are coupled in an optical fiber path to facilitate the selective adding/dropping of individual optical channels and to facilitate in-service upgrades without disrupting existing transmissions in the optical fiber path. In an exemplary embodiment, at least two directional optical transfer devices, such as optical circulators, are coupled to a drop path for dropping optical channels from the WDM signal, an add path for receiving optical channels to be added to the WDM signal, and a common path between the directional optical transfer devices. In the common path, at least one optical routing module is employed which is capable of receiving the WDM signal at an input and routing or otherwise switching the WDM signal to outputs, each of which can be coupled to one or more wavlength-selective modules. Each wavelength-selective module can be configured with an arrangement of optical filters, such as fiber gratings, and optical switches to facilitate the selective adding and dropping of one or more individual optical channels. Importantly, the optical routing module includes additional outputs for coupling to additional optical routing modules, additional wavelength-selective modules, and other components in order to accommodate changing add/drop requirements, which is an anticipated characteristic especially of metropolitan optical networks.
摘要翻译：提供了可扩展的，可重新配置的和具有成本效益的添加/删除布置，其使得能够升级波分复用（WDM）系统以适应新的或改变的添加/删除要求，而不会中断现有服务。分插布置基于模块化架构，其中一个或多个模块化光路由设备以光纤路径耦合以便于各个光信道的选择性添加/删除，并且便于在线升级，而不会中断现有的传输光纤路径。在示例性实施例中，诸如光循环器的至少两个定向光传输设备被耦合到用于从WDM信号丢弃光信道的丢弃路径，用于接收要添加到WDM信号的光信道的添加路径，以及方向光学传输装置之间的公共路径。在公共路径中，使用至少一个光路由模块，其能够在输入处接收WDM信号，并且将WDM信号路由或以其他方式切换到输出，每个输出可以耦合到一个或多个波长长度选择模块。每个波长选择模块可以配置有诸如光纤光栅的光学滤波器和光学开关的布置，以便于选择性地添加和丢弃一个或多个单个光学通道。重要的是，光路由模块包括用于耦合到附加光路由模块，附加波长选择模块和其他组件的附加输出，以便适应改变的添加/丢弃要求，这是特别是大城市光网络的预期特征。

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