98.7-Gb/s Optical SE-DMT Transmission using an Enhanced Decision-Directed Algorithm with Preconditions

We propose an enhanced decision-directed algorithm with preconditions for spectral efficient DMT signals. A 98.7-Gb/s 4-QAM modulated optical SE-DMT transmission over 2-km fiber is successfully demonstrated, achieving an electrical spectral efficiency of 3.9-bit/s/Hz.