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One possibility to break down the capacity limit in optical transmissionsystems are higher spectral efficiencies, enabled by Faster-than-Nyquistsignaling. Here we present the utilization of non-orthogonal time divisionmultiplexing of sinc pulse sequences for this purpose. The mathematicalexpression, with a representation of the Nyquist sinc sequence by a cosineFourier series and simulation results show that non-orthogonal time-divisionmultiplexing increases the transmittable symbol rate by up to 25%.

Faster than Nyquist Transmission by Non-Orthogonal Time Division Multiplexing of Nyquist Sinc Sequences