Abstract
We investigated the effect of subcarriers-to-subcarriers mixing interference and
frequency fading in direct-detection (DD) optical orthogonal frequency-division
multiplexing (OFDM) system. We also proposed and experimentally demonstrated a novel DD
OFDM transmission scheme with pre-emphasis technique. By pre-emphasizing the power of
the OFDM subcarriers at the high frequency, the received sensitivity at our experiment
was improved about 2 dB at a bit error rate of $1 x 10<sup>-4</sup> after 100-km SMF-28
transmission compared to the regular one without this technique.
© 2011 IEEE
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