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In this paper, we will review our latest developments in improving the spectral efficiency and receiving sensitivity in a direct-detected OFDM transmission system. An RF-tone assisted virtual single sideband (VSSB) OFDM modulation format is proposed to enhance the spectral efficiency in both electrical and optical domains for direct detected OFDM applications. The receiving sensitivity can be improved...
We investigate the lower sensitivity bound, in terms of optical signal-to-noise ratio (OSNR), for direct-detected orthogonal frequency-division-multiplexing (DD-OFDM) systems in the presence of optically preamplified receivers. Using the spectrally matched optical filter, which is composed of two parallel filters for the carrier and sideband and has a passband matching to the signal spectrum, the...
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