This paper addresses OFDM transmission over optical links with high spectral efficiency, i.e. by using high-order QAM-modulation schemes as a mapping method prior to the OFDM multicarrier representation. Low and moderate cost optics which is mandatory in access and in metro applications is assumed. Here we address especially direct detection receivers using… (More)
— This paper addresses multi-level PSK modulation formats with coherent and non-coherent detection and reviews signal processing algorithms like mitigation of phase noise, the clock and carrier recovery algorithms as well as the equalizer structures and their performance.
We compare experimentally the on-off keying (OOK) modulation format with the bandwidth efficient duobinary modulation format in 10 Gb/s Ethernet short haul transmission systems based on multi mode fibre (MMF). Thereby, the investigations are focussed on the robustness towards the negative influences of multimode fibre characteristics. It is shown by… (More)