Optical communication history

China's ancient light to transmit information, can be traced back 2700 years ago in the Zhou Dynasty. When the beacon is used for communication facilities, also known as Beacon or wolf Yantai. Stage reactor with firewood and Smoke ─ ─ dried wolf dung, there are soldiers guarded day and night rotation, a case of emergency military, give the fire at night, fires raging, during the day and then give smoke, smoke signals straight Miracle, even in the very distant can be seen. This one received a single lighted the flames, news soon spread far. China's Great Wall on the set a lot of this beacon. Later, people would give the fire by changing the manner and frequency to pass more complex information.

FiberHome must run up sets, multi-fuel wood. And the small size of the "updating" is much more cumbersome than it appears. "Updating" is essentially a hot-air balloon, according to legend of the Three Kingdoms, Zhuge Liang invented. Its appearance is a paste with fine strips of tissue paper on a large lantern, only a little below the mouth open, mouth hanging under a vessel near, filled with rosin or oil, igniting the air as heat expansion of the light into the cavity, fall within the density of the cold air discharge port to be small cavity filled with hot air, hot air is less than the total weight of the lamp light weight body arranged in the air when updating it slowly into the air, until the fuel runs slowly down back to the ground. Updating of the use of color, the number you can pass different information to the distanceLater, people invented the semaphore, signal flares, signal flares are used similar reasoning to pass the signal. However, these methods are affected by the impact of climate and transmission distance is limited.

Recall that the optical fiber to optical communications onto a new stage. Within the fiber-optic light transmission, so the secret of good performance, anti-jamming capability (the ability to influence from outside) strong. With this new type of laser light, because light intensity, good direction, they are able to pass a very far distance. Now this advanced technology, optical fiber communication has entered the practical stage. China's optical fiber communication industry developed very rapidly, many pilot projects have been completed, and can mass produce a fiber-optic cable. Optical fiber communication technology revolution has been listed as one of the key.