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Spectral behaviour of InGaAsP/InP 1.3 mu m lasers and implications on the transmission performance of broadband Gbit/s signals

: Wenke, G.; Enning, B.

Journal of optical communications 3 (1982), No.4, pp.122-8
ISSN: 0173-4911
Journal Article
Fraunhofer HHI ()
gallium arsenide; iii-v semiconductors; indium compounds; light polarisation; optical communication equipment; semiconductor junction lasers; signal processing; InGaAsP/inp; lasers; transmission performance; broadband Gbit/s signals; spectral characteristics; axial mode configuration; modulation; residual material dispersion; polarization dispersion; polarization-mode coupling

In 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.