What is the role of optical repeaters in fiber communications?
Optical signal transmission in optical fiber will have loss and dispersion, and non line letter effect will affect the transmission distance and capacity. The loss will affect the signal amplitude, and the dispersion will lead to fiber bandwidth broadening and error codeIn order to long-distance transmission must join the optical relay system in optical fiber transmission line, transmission loss and dispersion is used to compensate the signal. If not, the signal in long-distance transmission is too small and the occurrence of serious error, the receiver can not successfully received.The high cost of optical relay, optical amplifier after the optical amplifier is generally used instead of optical relay, commonly used Amplifier EDFA and Raman amplifier (EDFA), also have the dispersion compensation of dispersion compensation amplifier new.
Optical repeaters are devices that compensate for the loss of optical signals and eliminate the effects of signal distortion and noise in long distance optical fiber communication systems. It is a kind of optical fiber communication equipment. Its function is to extend the communication distance. It is usually composed of three parts: optical receiver, timing decision circuit and optical transmitter, and auxiliary equipment such as remote power supply, receive, remote control, telemetry and so on. The optical repeaters will receive weak light signals from the optical fiber and convert them into electrical signals by the optical detector. After the regeneration or amplification, the light source will be excited again and converted into strong optical signals to be sent into the optical fiber to continue transmission.
The function of the optical repeater is to compensate the attenuation of light and to shape the distorted pulse signal. When the optical signal is transmitted in a certain distance in the optical fiber, the light energy is attenuated, thus reducing the quality of the information transmission. In order to overcome this characteristic, a repeater is installed at every distance to ensure high quality and long distance transmission in large capacity and long distance optical fiber communication systems. This system is also called fiber relay communication.
