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Results are reported of a transmission experiment at 20 Gbit/s through 617 km of standard singlemode fibre using two-channel-WDM, 10 dispersion compensating fibre units and 12 optical inline amplifiers. With 231–1 PRBS the receiver sensitivities were as low as –32.3 dBm Mach-Zehnder modulator) and –30.6 dBm (electroabsorption modulator). The optical path penalties after 617 km transmission were 0.5 and 1.5 dB, respectively.
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Das et al. (1995) studied this question.
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