公开(公告)号：US5959749A

公开(公告)日：1999-09-28

申请号：US81666

申请日：1997-05-20

申请人： David John Danagher ,  Alan G. Solheim ,  Maurice S. O'Sullivan ,  Richard A. Habel ,  Kim Byron Roberts ,  Duncan John Forbes ,  Nigel Baker ,  Ian Hardcastle ,  Takis Hadjifotiou ,  Bipin Patel ,  Giuseppe Bordogna ,  James St. Leger Harley

发明人： David John Danagher ,  Alan G. Solheim ,  Maurice S. O'Sullivan ,  Richard A. Habel ,  Kim Byron Roberts ,  Duncan John Forbes ,  Nigel Baker ,  Ian Hardcastle ,  Takis Hadjifotiou ,  Bipin Patel ,  Giuseppe Bordogna ,  James St. Leger Harley

IPC分类号： H04J14/02 ,  H04Q11/00 ,  H04J14/00

CPC分类号： H04J14/0221 ,  H04J14/0212 ,  H04Q11/0005 ,  H04Q2011/0016 ,  H04Q2011/0024 ,  H04Q2011/0039 ,  H04Q2011/0069

摘要： An add/drop multiplexer/demultiplexer (ADM) for switching, modulating and attenuating optical signals in a fiber optic network employing wavelength division multiplexing (WDM) is disclosed. The ADM is equipped an optical multiplexer for splitting an input WDM signal into individual optical signals, leading to respective 2.times.2 switches. Each switch has another input originating from a plurality of "add lines", and selects one of its inputs to be dropped and the other to continue along a main signal path. The retained signals may be modulated and attenuated prior to being tapped and finally multiplexed together by a WDM multiplexer. The tapped signals are optoelectronically converted and fed back to a controller, preferably a digital signal processor running a software algorithm, which controls the switching, modulation and attenuation. This permits remote control of the ADM functions by encoding instructions for the controller into a low-frequency dither signal that is embedded within the individual optical signals. The ADM can accordingly be instructed to reroute traffic, dynamically equalize or otherwise change optical channel power levels, and add or remove dither, all in real time. A specific optical channel may be reserved for control purposes, allowing a network administrator to "log in" to the ADM to override the controller software algorithm. Optionally, the optical signals can be tapped upon entry to the ADM. A bidirectional ADM can be constructed from two unidirectional ADMs, and may share the same controller. Also, a single, general multi-input multi-output switch can be used to provide an arbitrary mapping between individual input and output optical signals.

公开(公告)号：US06101012A

公开(公告)日：2000-08-08

申请号：US343414

申请日：1999-06-30

申请人： David John Danagher ,  Alan G. Solheim ,  Maurice S. O'Sullivan ,  Richard A. Habel ,  Kim Byron Roberts ,  Duncan John Forbes ,  Nigel Baker ,  Ian Hardcastle ,  Takis Hadjifotiou ,  Bipin Patel ,  Giuseppe Bordogna ,  James St. Leger Harley

发明人： David John Danagher ,  Alan G. Solheim ,  Maurice S. O'Sullivan ,  Richard A. Habel ,  Kim Byron Roberts ,  Duncan John Forbes ,  Nigel Baker ,  Ian Hardcastle ,  Takis Hadjifotiou ,  Bipin Patel ,  Giuseppe Bordogna ,  James St. Leger Harley

IPC分类号： H04J14/02 ,  H04Q11/00

CPC分类号： H04J14/0221 ,  H04J14/0212 ,  H04Q11/0005 ,  H04Q2011/0016 ,  H04Q2011/0024 ,  H04Q2011/0039 ,  H04Q2011/0069

摘要： An add/drop multiplexer/demultiplexer (ADM) for switching, modulating and attenuating optical signals in a fiber optic network employing wavelength division multiplexing (WDM) is disclosed. The ADM is equipped an optical multiplexer for splitting an input WDM signal into individual optical signals, leading to respective 2.times.2 switches. Each switch has another input originating from a plurality of "add lines", and selects one of its inputs to be dropped and the other to continue along a main signal path. The retained signals may be modulated and attenuated prior to being tapped and finally multiplexed together by a WDM multiplexer. The tapped signals are optoelectronically converted and fed back to a controller, preferably a digital signal processor running a software algorithm, which controls the switching, modulation and attenuation. This permits remote control of the ADM functions by encoding instructions for the controller into a low-frequency dither signal that is embedded within the individual optical signals. The ADM can accordingly be instructed to reroute traffic, dynamically equalize or otherwise change optical channel power levels, and add or remove dither, all in real time. A specific optical channel may be reserved for control purposes, allowing a network administrator to "log in" to the ADM to override the controller software algorithm. Optionally, the optical signals can be tapped upon entry to the ADM. A bidirectional ADM can be constructed from two unidirectional ADMs, and may share the same controller. Also, a single, general multi-input multi-output switch can be used to provide an arbitrary mapping between individual input and output optical signals.

摘要翻译： 公开了一种用于在采用波分复用（WDM）的光纤网络中切换，调制和衰减光信号的分插复用器/解复用器（ADM）。 ADM装备有一个光信号多路复用器，用于将输入的WDM信号分离成各自的光信号，从而产生各自的2x2开关。 每个开关具有源自多个“相加线”的另一个输入，并且选择其一个输入被丢弃，另一个输入沿主信号路径继续。 保留的信号可以在被抽头之前被调制和衰减，并且最终由WDM多路复用器多路复用在一起。 抽头信号被光电转换并反馈到控制器，优选地是运行软件算法的数字信号处理器，其控制开关，调制和衰减。 这允许通过将控制器的指令编码成嵌入各个光信号内的低频抖动信号来远程控制ADM功能。 因此可以指示ADM重新路由业务，动态均衡或以其他方式改变光信道功率级别，并且实时地添加或去除抖动。 可以保留特定的光通道用于控制目的，允许网络管理员“登录”到ADM以覆盖控制器软件算法。 可选地，可以在进入ADM时轻拍光信号。 双向ADM可以由两个单向ADM构建，并且可以共享相同的控制器。 此外，单个一般的多输入多输出开关可用于提供各个输入和输出光信号之间的任意映射。