Wenke, G.G.WenkeEnning, B.B.Enning2022-03-022022-03-021982https://publica.fraunhofer.de/handle/publica/170204In connection with the implementation of long-wavelength broadband Gbit/s transmission systems the spectral characteristics of InGaAsP/InP lasers emitting in the 1.3 mu m wavelength region are investigated. The axial mode configuration of the examined lasers is affected by optical feedback from coupling arrangements and broadened as a result of direct modulation. Along with residual material dispersion, polarization dispersion and polarization-mode coupling of the single-mode fiber the laser limits the transmission quality in a transmission system for Gbit/s applications. Considerations about laser spectral behaviour and supporting experimental results are given. Suggestions are made for improving the transmission quality of broadband Gbit/s transmission over long-haul single-mode fibers.engallium arsenideiii-v semiconductorsindium compoundslight polarisationoptical communication equipmentsemiconductor junction laserssignal processingInGaAsP/inplaserstransmission performancebroadband Gbit/s signalsspectral characteristicsaxial mode configurationmodulationresidual material dispersionpolarization dispersionpolarization-mode coupling621journal article