By multiplexing two OFDM signals with the same channel space and bit rate together in an interleaved mode, a novel optical multiplexing scheme is proposed and experimentally demonstrated. Since the channel space is halved, the spectral efficiency is doubled compared with conventional OFDM. It is proved that the orthogonality between the subcarriers is maintained as long as the data is real. With discrete Fourier transform, the proposed scheme has similar computational complexity as conventional OFDM and single sideband modulation is conveniently achieved. A 10 Gb/s transmission system is set up, and proves the feasibility and efficiency of the scheme experimentally.
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