Laser diodes integrated with electroabsorption modulators for 40 Gb, s data transmission [Elektronische Ressource] / by Martin Peschke

ECOD·ODNEICS·MLUTÄTLaser Diodes Integrated withElectroabsorption Modulatorsfor 40 Gb/s Data TransmissionPh.D. Dissertationaccepted by theFaculty of Engineering Science,University of Ulm,Germanyfor the degree ofDoktor-Ingenieur (Dr.-Ing.)byDipl.-Ing. Martin PeschkeDean of Faculty: Prof. Dr.-Ing. H.-J. PfleidererFirst Referee: Prof. Dr. rer. nat. K.-J. EbelingSecond Prof. Dr.-Ing. M.-C. AmannthSubmitted on: October 18 , 2005thOral Examination: March 17 , 2006ISREVINU·ODNARUC·ODNIn memory ofBernhard Stegmuller¨Contents1 Introduction 12 Qualitative Approach 42.1 ElectroabsorptionModulationBasics...................... 42.2 IntegrationConceptsofLaserandModulator ................. 62.3 Material Systems for Communication Application . . . . . . . . . . . . . . . 83 Absorption Spectra 113.1 Two-DimensionalElectronandHoleStates................... 123.2 AnalyticExpresionfortheAbsorptionCoefficient............... 143.3 FitAlgorithm................................... 183.4 Combined Photocurrent and Transmission Measurement . . . . . . . . . . . 213.5 Kramers-KronigRelationandChirpParameter ................ 234 Gain Spectra 264.1 QuantumWellGain ............................... 274.2 InjectionandCarrierTransport......................... 304.3 SimplifiedInjectionModelforAlGaInAsQWs................. 324.4 ComparisontoBroadAreaLaserExperiments 364.5 RidgeWaveguideGainSpectra .........................