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本文对目前国外光纤光栅的研究概况进行了评述。介绍了几种光纤光栅无源和有源器件，并对成栅光源、成栅方法性能进行了比较。
This paper reviews the current research status of foreign fiber grating. Several kinds of fiber grating passive and active devices are introduced, and the performance of the gate-to-gate light source and the gate forming method is compared.