IEEE Photonics Technology Letters · 1999 · 33 citations · 5 references
EngineeringElectrical EngineeringMeasurement InvarianceOptoelectronicsPhotonicsFiber OpticsNoiseNoise ReductionOptical AmplifiersOptical FibersSignal AmplificationErbium-doped Fiber AmplifiersGainGain SaturationNoise FigureNoise Figure AnalysisOptical AmplificationOptical Signal AmplificationSaturation
Although gain-clamping an erbium-doped fiber amplifier (EDFA) by a counterpropagating ring resonator prevents oscillation light from being output, it degrades the amplifier's noise figure. The noise figure degradation can be reduced by using a length of EDF, that is short enough not to cause any gain saturation, for preamplification. Experiments confirm that the prestage EDFA reduces the noise figure degradation under constant gain operation.
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