The transmission experiments demonstrate that operation of 2.488 Gbit/s optical transmission systems over more than 150 km standard SMF is not dispersion limited using today's 1550 nm DFB-lasers. With an extinction ratio as low as 11 dB a dispersion and extinction ratio penalty of less than 0.7 dB was observed.
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Kluitmans et al. (1990) studied this question.