Simultaneous optical regeneration of four 200 GHz-spaced 40 Gbit/s channels in a single polarisation-insensitive InP Mach-Zehnder modulator is demonstrated by means of a dense WDM loop transmission over 10,000 km, yielding spectral efficiency of 0.27 (bit/s)/Hz.
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Leclerc et al. (2000) studied this question.
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