号称国防警报线的鼻祖——烽火台,早在我国西周时期即已问世。这种视觉“光通信”的距离因以目力所及为限,而且不能表达复杂的通信内容,随着“电通信”的诞生逐渐消声匿迹。但人们并未忘记“光”这个古老的信息传输媒介。本世纪60年代“光之骄子”——激光问世,激起人们对“光通信”的怀念,揭开了光通信“返老还童”的新篇章。激光的频率极高、颜色极纯、射向极好,作为光通信的光源是最理想不过了。激光通信与电通信一样,分为“无线”和“有线”两大类。无线光通信是在收 Known as the originator of the national defense warning line - beacon towers, as early as the Western Zhou Dynasty in China has come out. The distance between this kind of vision and “optical communication” is limited by the eyesight, and can not express complicated communication contents. As the birth of “electric communication”, it gradually disappears. But people have not forgotten the old “light” information transmission medium. In the 60s of the last century, “the pride of light” - the advent of lasers, aroused people’s remembrance of “optical communications” and opened a new chapter in optical communications “rejuvenating the old.” The laser frequency is extremely high, the color is very pure, shooting very well, as the light source of optical communication is the most ideal. Laser communications and electrical communications, like, divided into “wireless ” and “cable ” two broad categories. Wireless optical communication is received