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We demonstrate a 1 Tbit/s 256 QAM-OFDM transmission with a spectral efficiency of 14.3 bit/s/Hz. A record transmission distance of 560 km was achieved for terabit data with a spectral efficiency of more than 10 bit/s/Hz.
We demonstrate a polarisation-multiplexed 64 QAM coherent transmission with sub-carrier OPLL based homodyne detection utilising an optical voltage controlled oscillator (OVCO). By using the OVCO, low phase noise OPLL operation was achieved and a 120 Gbit/s data signal was successfully transmitted over 150 km with a low power penalty.
We demonstrate a 400-Gbit/s frequency-division-multiplexed and polarization-multiplexed OFDM transmission over 400 km (5×80 km SSMF) with 256 QAM subcarrier modulation using an optical PLL. A record spectral efficiency of 14 bit/s/Hz was successfully achieved.
We report the first demonstration of 512 QAM coherent optical transmission by using an optical PLL. A polarisation-multiplexed 54 Gbit/s data signal was successfully transmitted at 3 Gsymbol/s with an optical bandwidth of 4.1 GHz including a tone signal.
We describe a single-channel 400 Gbit/s (polarization-multiplexed, 10 Gsymbol/s, 4 OTDM-32 RZ/QAM) coherent transmission using an optical phase-locked loop technique with a frequency-stabilized fiber laser. 400 Gbit/s data were transmitted over 225 km.
We demonstrate a 140 Gbit/s coherent optical transmission over 150 km with a polarization-multiplexed 10 Gsymbol/s, 128 QAM format in a 20 GHz bandwidth. Error-free 120 Gbit/s-150 km transmission is also realized with 64 QAM.
We present the first demonstration of 256 QAM coherent optical transmission, where 64 Gbit/s polarization-multiplexed data at 4 Gsymbol/s were successfully transmitted over 160 km with an optical bandwidth of only 5.4 GHz.
We demonstrate 2-Gsymbol/s polarisation-multiplexed coherent optical OFDM transmission with QAM subcarrier modulation as high as 64-states using an optical PLL. 24-Gbit/s data were successfully transmitted over 160 km with a demodulation bandwidth of 2.5 GHz.
We have successfully transmitted a three-channel frequency division multiplexed 1-Gsymbol/s, 64 QAM coherent optical signal over 160-km with a 1.4-GHz spacing. The spectral efficiency reaches as high as 8.6-bit/s/Hz.
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