Experiments demonstrate that L-band EDFA will achieve high flat gain by employing a gain flat filter based on fiber loop mirror (FLM).

使用光纤环形镜(FLM)作为增益平坦滤波器进行L波段掺铒光纤放大器的增益平坦化实验，实现了高增益值的平坦输出。

youdao

For the change filter system of the flat film stretching line, we apply advanced automatic belt change filter.

为改变过滤系统的延伸线平片，我们运用先进的自动带改变过滤器。

youdao

And the made filter has uniform chroma and flat surface.

由本方法制造的滤光片有均匀的色度及平坦的表面。

youdao