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    Dynamic fiber loop-mirror filter based on pump-induced saturable gain or saturable absorber gratings
    3.
    发明授权
    Dynamic fiber loop-mirror filter based on pump-induced saturable gain or saturable absorber gratings 有权
    基于泵浦可饱和增益或可饱和吸收光栅的动态光纤环路滤波器

    公开(公告)号：US06389195B1

    公开(公告)日：2002-05-14

    申请号：US09391337

    申请日：1999-09-08

    申请人： Steven A. Havstad ,  Baruch Fischer

    发明人： Steven A. Havstad ,  Baruch Fischer

    IPC分类号： G02B642

    CPC分类号： G02F1/3523 ,  G02F1/3519 ,  G02F2203/055

    摘要： An all-fiber, optically-tunable, narrowband optical loop-mirror filter (10) that makes use of a loop-mirror (24). The optical filter (10) includes a coupler (12), including two input fiber ports (14, 16) and two output fiber ports (18, 20) that are connected together to form the loop-mirror (24). A saturable medium (22) is positioned in the loop-mirror (24), and can be either a saturable absorber medium or a saturable gain medium. A potentially broadband optical input signal to be filtered and a pump are applied to the input ports (14, 16) of the coupler (12). The counter propagating signals in the loop-mirror (24) generated by the input signal and the pump create two standing wave interference patterns in the saturable medium (22). Depending on whether the input signal and the pump are applied to the same input port (14, 16) or different input ports (14, 16) determines whether the two standing wave interference patterns are in phase with each other or &Xgr; radians out of phase with each other. If the saturable medium (22) is a saturable gain medium, then the peaks of the pump standing wave interference pattern bleach the gain of the filter (22) at the peak locations, preventing amplification of the input signal at these locations. Likewise, if the saturable medium (22) is a saturable absorber medium, the peaks of the pump interference pattern bleach the absorption of the saturable medium (22) at the peak locations, leaving rest of the saturable medium (22) to provide saturation. Therefore, the filter (10) can be either a bandpass filter or a notch filter.

    摘要翻译： 全光纤，可光学调谐的窄带光环路镜过滤器（10），其利用环形镜（24）。 滤光器（10）包括耦合器（12），其包括两个连接在一起以形成环形反射镜（24）的两个输入光纤端口（14,16）和两个输出光纤端口（18,20）。 可饱和介质（22）被定位在环形反射镜（24）中，并且可以是饱和吸收介质或可饱和增益介质。 待滤波的潜在宽带光输入信号和泵施加到耦合器（12）的输入端口（14,16）。 由输入信号和泵产生的环路反射镜（24）中的反向传播信号在可饱和介质（22）中产生两个驻波干扰图案。 根据输入信号和泵是否被施加到相同的输入端口（14,16）或不同的输入端口（14,16），确定两个驻波干扰图案是否彼此同相或者＆amp; Xgr; 弧度相互不相位。 如果可饱和介质（22）是可饱和增益介质，则泵驻波干涉图的峰值在峰值位置漂白滤波器（22）的增益，从而防止在这些位置放大输入信号。 类似地，如果可饱和介质（22）是可饱和的吸收介质，则泵干涉图案的峰值在峰值位置漂白可饱和介质（22）的吸收，留下可饱和介质（22）以提供饱和。 因此，滤波器（10）可以是带通滤波器或陷波滤波器。