means of communication. In principle, constitute the basic elements of optical fiber communication optical fiber, a light source and a light detector. Optical fiber in addition to the manufacturing process, material composition and optical properties for classification, in the application of the optical fiber, used to use for classification, can be divided into communication and optical fiber sensor with optical fiber. Transmission medium optical fiber is divided into general and special two, and functional devices for optical fiber refers to the amplification, shaping, frequency divider, frequency,

modulation and optical oscillation features such as optical fiber, and often a function of the device appeared in the form of. Two. The characteristics of optical network technology

The existing network composed of optical transmission system and electronic nodes, optical technology for two electronic node point-to-point transmission, at each node electronic light signal are converted into electrical signals by electronic node electric treatment, a two network edge connection between nodes

usually multi-hop connection, this will increase the transmission delay, the electronic node processing burden is overweight, limiting network node throughput. Since 90 time, with the