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Summary form only given. Laser devices with emission wavelengths at 1.3 μm are of key importance for applications in data and telecommunication systems in particular for local area and metropolitan area networks. At present, primarily the InP-based (GaIn)(PAs) and (AlGaIn)As material systems have been applied to realize such laser structures. In recent years, novel material systems and heterostructures like (GaIn)(NAs) and Ga(AsSb) have gained increasing interest due to their unique physical properties. This review intends to summarize the present situation of the device performance both for edge-emitting as well as vertical cavity surface emitting (VCSEL) laser structures related to materials and heterostructure properties point of view.