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For realizing wavelength-division multiplexing (WDM) transmission systems, one of the most important devices is the erbium-doped fiber amplifier (EDFA), which exhibits a flat gain, a high pumping efficiency, and a low noise figure (NF). To meet these requirements, we have optimized the hybrid EDF configurations composed of cascaded Al codoped EDF and P/Al codoped EDF. Their characteristics have been...
Feasibility of repeaterless transmission systems over non-dispersion-shifted fiber (NDSF) using directly modulated DFB lasers and dispersion compensating fiber (DCF) was examined. The transmission characteristics were investigated by simulations, considering the effects of the laser chirping, fiber chromatic dispersion, and the self-phase-modulation (SPM) occurring in both NDSF and DCF. As a result,...