All-optical communication is a new optical wave communication without any photoelectric conversion. In all-optical communication system, image and voice information are directly converted into optical signals and transmitted in transmission media. In the all-optical communication system composed of camera optical system, optical fiber system and receiving optical amplification system, there is no photoelectric conversion, so there is no electronic component, the signal distortion is small, and it can work continuously in the high temperature environment above 100  degree. It is an ideal way of communication.
The information medium of all-optical communication system is light wave does not fit into this paragraph.