Research On Gain Flatness Characteristics Optimize Of Erbium-Dped Fiber Amplifiers

Fiber Amplifier is one of the key components to realize all optical fiber communication system. In recent years, as people diversified communication services is ever increasing, information and communication technology has been rapid development, new technologies need a higher performance of optical fiber amplifiers. In dense wavelength division multiplexing system, cable network and so on high-power distribution systems, fiber amplifiers have higher requirements saturated output power and wider band.The gains flat band of the erbium-doped fiber amplifier (EDFA) is narrower. The amplifier’s gain flatness is optimized to meet the increasing communications business need and to improve the utilization rate of light technology’s frequency band. A lot of research of optimization gain flatness at home and abroad has been made and obtain some achievement at home and abroad. This paper proposes a method of using optical fiber macro bending effect to optimize gain flatness.The first part of this paper, we analysis the reasons of the amplifier’s gain no smooth through discussing the work of EDFA principle and mathematical model. In the second part, the method of the optimization gain flatness at home and abroad is introduced. The theory of optical fiber bending loss is analyzed, in order to analysis the influence factor of optical fiber bending loss. At last, through experiment test and the simulation, the feasibility of the method which is put forward in this paper is validated. The influence of fiber bending radius, signal wavelength and power to optical fiber bending loss is tested in the experiment. In the simulation the effect of optimization gain flatness about different length EDF is tested.