The Influence Factors of EDFA in the Optical Transmission System

One of the goals that being received in any telecommunication connections to offerthe longest distance between transmission systems such as undersea, intercontinentaland terrestrial connections. In common sense, components employed betweentransmission ends are appropriate to be reduced to keep up an expensive performance.Fiber Optic Amplifiers in optical communication become significant as there is not anexpensive repeater.

Optical transmission systems designed for making are a selection of networkapplication. Usually, unreported optical system connects an island to the mainland viaundersea outdoor fiber optic cable as well as a group of islands. Transmissionconnections along coasts of a mainland are more favorable as well as a group ofislands. Transmission connections along coasts of a mainland are more propitious asmost of the population around the globe are located near the ocean. Unregulatedsystems are significantly complete the repeated system. Furthermore, mixing it withother types of connections within a terrestrial network can be made where the opticaltransmission systems allow a transmission crossing the wet area.

A locally pumped post EDFA or Booster Amplifier boosts the signal level beforelaunching it into transmission fiber connections. The boosted signal amplifier, similarproduct: CATV signal amplifier, can be further amplified using forward distributedRaman amplifier (DRA). A post R-EDFA is located a few tenths of kilometers fromthe transmitter ti amplify the weak signal. This EDFA pumped via a amplify the weaksignal. This EDFA pumped via a dedicated pump fiber. The figure displays the signalpower evolution, represented by a dashed line along transmission distance utilizingforward DRA and post R-EDFA.

On the other hand, the figure shows that signal power evolution with respect tobackward DRA and pre R-EDFA. At the receiver terminal, a deceived pre EDFA isused to amplify the received signal, this local pumped EDFA followed by opticalfilter and an optical to electrical converter.

System configurations show a practical implementation and typical positions of theR-EDFA and DRA in order to improve the transmission performance. Furthermore,two principal factors affect the optical transmission performance. The first factor isthe system configuration, where various system configurations were examined andcriticized. It shows that the configuration has a direct impact on the performance. Thesecond factor is the total pump power injected into the system. By increasing the totalpump power, the transmission distance can be expanded. On the other hand,improving the total injected pump power increases the non-linear effects of thetransmission fiber, which degrades the system performance. Until now, there are notany clear and structured design rules for optical transmission systems. Therefore,design rules for optical transmission systems have become indispensable in this field.Finally, future researchers are asked to focus on reducing the noise figure at highpump powers.