The application field of optical fiber communication is very wide, mainly used for the municipal telephone trunk line, the advantages of optical fiber communication can be fully developed here, gradually replace the cable, has been widely used. Also used for long-distance trunk communications, which used to rely mainly on cables, microwaves and satellite communications, is now being used to gradually use optical fiber communications and to form a global advantage of bit transmission methods; industrial production on-site monitoring and dispatch, traffic surveillance control command, urban cable television network, common antenna (CATV) system, for fiber-optic LAN and other use in aircraft, ship, ship, mine, power sector, military and corrosive and radiation.
The fiber optic transmission system is mainly composed of optical transmitter, optical receiver, optical cable transmission line, optical repeater and a variety of passive optical devices. To achieve communication, the baseband signal must also be processed by the electric end machine and sent to the optical fiber transmission system to complete the communication process.