Newly revived over the past few years after having been invented in the 1970s, FSO relies on low-power infrared laser transceivers that can beam two-way data at gigabit-per-second rates.

• 无线光通讯基本上就是不用光纤的光通讯，发明于1970年代，近几年来又重返江湖，赖以运作的低功率红外线雷射收发机，能以每秒10亿位元的高速率双向传送资料。