《光纤通信课程设计》课件：Class6-03.pptVIP

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《光纤通信课程设计》课件：Class6-03.ppt

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Fiber Optic Network DesignX. Wu, M. Y. Li, H. M. YanDept. of Opt. Engr., ZJU2011Class 6 ?Optical AmplificationEDFAStructureParametersSelectionGain flatteningExercise An optical amplifier is a device which amplifies the optical signal directly without ever changing it to electricity. The light itself is amplified. Reasons to use the optical amplifiers: ReliabilityFlexibilityWavelength Division Multiplexing (WDM)Low CostVariety of optical amplifier types exists, including:Semiconductor Optical Amplifiers (SOAs)Erbium Doped Fiber Amplifiers (EDFAs) Traditional Optical Communication SystemLoss compensation: Repeaters at every 20-50 km Optically Amplified SystemsEDFA = Erbium Doped Fiber Amplifier Variety of optical amplifier types exist, including:Semiconductor optical amplifiersOptical fibre amplifiers (Erbium Doped Fibre Amplifiers)Distributed fibre amplifiers (Raman Amplifiers)Optical fibre amplifiers are now the most common typeOne of the most successful optical processing functionsAlso used as a building block in DWDM systems Source: Master 7_5Optical Amplification Erbium doped fiber amplifiersAmplifier applicationsIssues: Gain flattening and NoiseOverview Basic EDF Amplifier DesignErbium-doped fiber amplifier (EDFA) most commonCommercially available since the early 1990’sWorks best in the range 1530 to 1565 nmGain up to 30 dB (1000 photons out per photon in!)Optically transparent“Unlimited” RF bandwidthWavelength transparentInput1480 or 980 nm Pump LaserErbium Doped FiberOutputIsolatorCoupler Pump SourceWDMErbium Doped FibreIsolatorIsolator = Fusion SpliceInputOutputA pump optical signal is added to an input signal by a WDM couplerWithin a length of doped fiber part of the pump energy is transferred to the input signal by stimulated emissionFor operation ~ 1550 nm the fiber dopant is ErbiumPump wavelength is either 980 nm or 1480 nm, pump power ~ 50 mWGains of 30-40 dB possibleErbium Doped Fiber Amplifier Fibre input/outputErbium doped fibre loopPump laserWDM