Abstract
We experimentally demonstrate a beyond 100 Gb/s intensity modulation/direct detection (IM/DD) 16-QAM optical spectrally efficient frequency division multiplexing (SEFDM) transmission over 2-km standard single mode fiber (SSMF) with 20% signal bandwidth compression. Time-domain equalization (TDE), which outperforms frequency-domain equalization (FDE) in our system, is adopted for SEFDM system due to the inter-carrier interference (ICI) induced by the spectrum compression. A hybrid cascaded binary-phase-shift-keying iterative detection (CBID) together with fixed sphere decoder (FSD) is successfully utilized to eliminate ICI in such a high-speed interconnection system. Experiment results show that SEFDM outperforms conventional discrete multi-tone (DMT), occupying less frequency spectrum resource and achieving superior resistance to bandwidth limitation and dispersion-induced power fading in fiber links. We also show that CBID is a more effective scheme with 10% bandwidth compression, considering the receiver complexity, while CBID-FSD is proposed for further bandwidth compression.
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