The most typical weather restriction of Free-space Optical Communications System is the fog; the fog attenuation of laser is a main factor that affects the performance of the lasers communication.

雾是制约无线光通信系统的最典型气象条件，它对激光的衰减效应是影响光通信性能的主要因素。

youdao

It is more importance that tunable laser sources apply in DWDM, with high speed and great capacity optical communications system rapid progress.

随着高速大容量光通信系统的迅猛发展，可调谐激光光源在DWDM中的应用将越来越重要。

youdao

So Starkweather fired a laser through the air between the two buildings, an improvised communications system that meant that, if you were driving down the Foothill Expressway on a foggy night and happened to look up, you might see a mysterious red beam streaking across the sky.

NEWYORKER: Creation Myth