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1. 发明授权

US06694066B2 Method and apparatus for an optical filter 有权
标题翻译：光滤波器的方法和装置
公开(公告)号：US06694066B2
公开(公告)日：2004-02-17
申请号：US09879026
申请日：2001-06-11
申请人： Ping Xie , Simon Yuanxinag Wu , Yalan Mao , Wei Wang , R. Brad Bettman , Nadim Maluf
发明人： Ping Xie , Simon Yuanxinag Wu , Yalan Mao , Wei Wang , R. Brad Bettman , Nadim Maluf
IPC分类号： G02B600
CPC分类号： G02B6/29302 , G02B6/12007 , G02B6/2861 , G02B6/2935 , G02B6/29398 , G02B2006/12109 , G02B2006/12116 , G02B2006/12164
摘要： The present invention provides optical filters that can be used in a range of telecommunications applications including optical multiplexers/demultiplexers, optical routers, and optical gain scalers. The optical filter is modular, using two or more couplers with a pair of delay paths between each pair of couplers in a sequence to generate a range of optical filter functions. The desired filter profile/function is obtained by proper selection of the coupling ratio for each coupler and by the length of each pair of delay paths. The couplers may be implemented as polarization or intensity beam splitters positioned along the optical path. Each coupler couples in controllable amounts, one or two inputs with the corresponding pair of delay paths. Where a coupler is implemented as a polarization beam splitter, the coupling is accomplished by input to the coupler of polarized light and by the subsequent separation of orthogonal “P” and “S” components of that light onto corresponding ones of the pair of delay paths. Where coupling is implemented with an intensity beam splitter, the coupling is accomplished by input of light with the percentage of reflection and transmission of the light determining the coupling ratio or percentage of the light input onto corresponding ones of the pair of delay paths. The pair of delay paths includes in an embodiment of the invention, passive thermal stabilization. The passive thermal stabilization of the filter(s) is accomplished by a plurality of optical elements positioned in and defining the optical path length of each member of the pair of paths. These optical elements are designed so that the optical path length difference between the pair of delay paths remains substantially invariant across a range of temperatures.
摘要翻译：本发明提供可用于包括光复用器/解复用器，光路由器和光增益定标器在内的电信应用范围内的滤光器。光学滤波器是模块化的，使用两个或更多个耦合器，其在每对耦合器之间具有一对延迟路径，以产生一系列滤光器功能。期望的滤波器轮廓/功能通过适当地选择每个耦合器的耦合比和每对延迟路径的长度来获得。耦合器可以被实现为沿光路定位的偏振或强度分束器。每个耦合器以可控量耦合，一个或两个输入与相应的延迟路径对耦合。在耦合器被实现为偏振分束器的情况下，耦合通过输入到偏振光耦合器并且随后将该光的正交“P”和“S”分量分离到该对延迟路径中的对应的一对延迟路径。在用强度分束器实现耦合的情况下，通过输入具有光的反射和透射百分比的光来实现耦合，确定光输入到一对延迟路径中的相应延迟路径的耦合比或百分比。一对延迟路径包括在本发明的一个实施例中，被动热稳定。过滤器的被动热稳定化由位于并限定了该对路径中的每个构件的光路长度的多个光学元件来实现。这些光学元件被设计成使得一对延迟路径之间的光程长度差在整个温度范围内基本上保持不变。

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