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Capacity limits of dispersive fiber links with direct-modulation/direct-detection using adaptively modulated optical OFDM

The capacity of single-mode fiber links with direct-modulation/direct-detection is limited by the fiber dispersion and laser chirp. which lead to frequency selective fading at the receiver. In such transmission channels, the capacity can be improved by adaptively modulated optical OFDM. In this paper, we discuss the capacity limits of such links using adaptively modulated optical OFDM both in theory and experiment.