We present a 60Gbit/s polarization-multiplexed coherent optical OFDM transmission at 5Gsymbol/s by employing 64 QAM subcarrier modulation. We adopted a frequency-stabilized fiber laser and an optical PLL to achieve this high multiplicity in the subcarrier modulation. As a result, we successfully transmitted 60Gbit/s data over 160km with a demodulation bandwidth of only 5.3GHz.
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Omiya et al. (2010) studied this question.
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