The Distributed Erbium-Doped Fiber Amplifier with Gradually Changing Doped Concentration
Since the mid-1980’s, the Erbium-doped fiber amplifier (EDFA) is an attraction for its high gain and low noise. The advance of the nonlinear communication (soliton communication) open up a bright future for EDFA.
How to suppress the noise of an amplifier is a crucial issue in the application of the EDFA in the soliton transmission system. The amplified spontaneous emission (ASE) noise created by the EDFA is a major obstacle to a commercial soliton communication system. Many ways are suggested to solve this problem. One of them claims that the distributed amplifier (dEDFA) is a better solution to soliton communication.
Through theoretical analysis and computer stimulation, this paper proves that the gradually changing doped concentration along the dEDFA will improve the noise performance of the amplifier. A preliminary discussion about the result has been presented here.
KeywordsDope Concentration Spontaneous Emission Amplify Spontaneous Emission Noise Performance Fiber Amplifier
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