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Computer simulation results indicate that the chromatic dispersion limitation in coherent single-mode-fibre systems is more severe than in direct-detection systems. As an example, for transmission through 100km of fibre at 1550nm, where chromatic dispersion is 15ps/km nm, the modulation rate that produces 2dB dispersion penalty ranges from 5 to lOGbit/s, depending on the modulation format.
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Elrefaie et al. (1987) studied this question.
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