A 1.28 Tbaud data signal is demonstrated, which is the highest symbol rate yet reported. The data signal is formed by optical time-division multiplexing of 128 data channels at 10 Gbit/s OOK in a single polarisation. The generated 1.28 Tbit/s data signal is demultiplexed in a nonlinear optical loop mirror, resulting in error-free performance with a BER<10−9 for all 128 demultiplexed channels.
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Mulvad et al. (2009) studied this question.