The working performance of an optical communication system is not only related to the light source,but als-o to its transmission medium.With the development of fiber optic technology and the pursuit of longdistance trans-mission in the field of optical communication,optical amplifiers have emerged.Optical amplifiers can directly amplify optical signals and have great application value in the field of communication.Summarized the basic p-rinciples and development of optical amplifiers.Firstly,the concept,classificaee types of optical amplifiers were introduced,inclu-ding their working princ-iples and performance.Then,the current situation of various types of optical amplifiers at home and abroad was analyzed.Finally,the future development of optiction,and principle of optical amplifiers are in-troduced.Then,the key technologies of the thral amplifiers is prospected.
erbium-doped fiber amplifierraman fiber amplifiersemiconductor optical amplifierinfinite optical communication
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