Abstract
The configuration of the hybrid amplifier (Raman Amplifier: RA + Erbium-Doped Fiber Amplifiers: EDFA) has been introduced and the restriction conditions of its optimum design have also been analyzed and discussed, and then the ASE noise and Rayleigh noise in Raman Amplifier (RA) as well as their influences on the Signal Noise Ratio (SNR) of the receiver have been analyzed in depth. Furthermore, the influences, which result from these noises, on the performances of the optimum design for the hybrid amplifier (RA + EDFA) have thoroughly been researched. Finally, some significant conclusions to play an important role in guiding the optimum design of the hybrid amplifier have been obtained by the above analyses and researches.
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