All-optical-fiber filtering device based on optical fiber F-P filter
A filter device and filter technology, which is applied in the field of laser radar atmospheric detection, can solve the problems of complex adjustment, poor reliability, and large volume, and achieve the effects of strong anti-interference performance, high reliability, and reduced volume and weight
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[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0026] The present invention is based on the all-optical fiber filter device of optical fiber F-P filter, as figure 1 As shown, including interconnected fiber coupling and splitting devices and two-stage cascaded all-fiber filtering devices, the atmospheric backscatter echo signal received by the telescope system is first divided into three paths by the fiber The cascaded all-fiber filter device is used for filtering.
[0027] Such as figure 2 As shown, the fiber coupling and splitting device includes a multimode fiber 1 and a 1×3 fiber splitter 2 connected to the multimode fiber 1, wherein the fiber splitter 2 is composed of a fiber coupler I9 and a fiber coupler II10 in series, The output end of the multimode fiber 1 is connected to the input arm a0 of the fiber coupler I9, and the fiber coupler I9 outputs at the output arm a1 and the ou...
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