8×11.5 Gbit/s (10 Gbit/s after coding) optical OFDM transmission over 1000 km standard single mode fibre (SSMF) with conventional distributed feedback (DFB) lasers and direct-detection is demonstrated. Compared with coherent-detection using external cavity lasers (ECL), DFB lasers and direct-detection can significantly reduce the system complexity and cost.
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Qian et al. (2008) studied this question.