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    Optical add/drop multiplexer/demultiplexer
    2.
    发明授权
    Optical add/drop multiplexer/demultiplexer 有权
    光分插复用器/解复用器

    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。

    Optical frequency control system and method
    3.
    发明授权
    Optical frequency control system and method 失效
    光频控制系统及方法

    公开(公告)号：US5777773A

    公开(公告)日：1998-07-07

    申请号：US741587

    申请日：1996-10-31

    申请人： Richard Epworth ,  Duncan John Forbes

    发明人： Richard Epworth ,  Duncan John Forbes

    IPC分类号： G02F1/01 ,  H01S5/0683 ,  H01S5/0687 ,  H04B10/04 ,  H04B10/06 ,  H04B10/14 ,  H04B10/155

    CPC分类号： H04B10/572 ,  H04B10/504 ,  H01S5/0085 ,  H01S5/0687

    摘要： Method and apparatus for controlling the frequency of a laser in an optical transmission system which involves applying a frequency modulation to the laser, determining an amplitude modulation present in the signal downstream of the laser and attributable to the frequency modulation, and discriminating a portion of the amplitude modulation which is substantially in phase quadrature with the applied frequency modulation. The frequency of the laser is controlled on the basis of the discriminated quadrature portion. An optical component downstream of the laser may have a response which converts FM to AM. The response and the frequency output of the laser can be locked to one another, without errors caused by unwanted AM in the transmitted signal modulation frequency.

    摘要翻译： 用于控制光传输系统中的激光频率的方法和装置，其包括向激光器施加频率调制，确定在激光器下游的信号中存在的并可归因于频率调制的振幅调制， 幅度调制基本上与施加的频率调制相位正交。 基于鉴别正交部分来控制激光器的频率。 激光下游的光学部件可以具有将FM转换成AM的响应。 激光器的响应和频率输出可以彼此锁定，没有由传输信号调制频率中的不需要的AM引起的错误。