公开(公告)号：EP0959579A2

公开(公告)日：1999-11-24

申请号：EP99303868.6

申请日：1999-05-18

Applicant: NORTEL NETWORKS CORPORATION

Inventor： Danagher, David John ,  Solheim, Alan G. ,  O'Sullivan, Maurice S.

IPC: H04J14/02 ,  H04Q11/00

CPC classification number: H04J14/0221 ,  H04J14/0212 ,  H04Q11/0005 ,  H04Q2011/0016 ,  H04Q2011/0024 ,  H04Q2011/0039 ,  H04Q2011/0069

Abstract: An add/drop multiplexer/demultiplexer (ADM) for switching, modulating and attenuating optical signals in a fiber optic network employing WDM. The ADM has an optical multiplexer for splitting an input WDM signal into individual optical signals, leading to respective 2x2 switches. Each switch has another input originating from a plurality of "add lines". The input signals are tapped, optoelectronically converted and fed to a controller, which reads switching, modulation and attenuation instructions. The instructions can be encoded into a low-frequency dither signal that is embedded within the input optical signals. The ADM can accordingly be instructed to re-route traffic, dynamically equalize optical channel power levels, and add or remove dither, all in real time. A bi-directional ADM can be constructed from two unidirectional ADMs. Also, a single, general multi-input multi-output switch can be used to provide an arbitrary mapping between individual input and output optical signals.

Abstract translation: 一种用于在采用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具有用于将输入WDM信号分离为各个光信号的光复用器，导致各自的2×2个开关。 每个开关具有源自多个“添加行”的另一输入。 输入信号被抽头，光电转换并馈送到控制器，控制器读取开关，调制和衰减指令。 指令可被编码成嵌入在输入光信号内的低频抖动信号。 因此，可以指示ADM重新路由流量，动态地平衡光信道功率电平，并且实时地添加或去除抖动。 双向ADM可以由两个单向ADM构成。 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。