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We demonstrated the first time real-time FPGA-based coherent optical receiver for a 64 QAM transmission. Error free performance (BER < 1x10 -12 ) was achieved under a back-to-back condition and the BE...
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 a...
The effects of cascaded optical filtering on 10 Gsymbol/s DPSK and DQPSK signals are mitigated by pre-compensation based on the use of digital signal processing to generate the drive signals for a dua...
We investigated the performance of electronic pre-equalization to compensate for ISI caused in a vector modulator for 5 Gsymbol/s 64QAM. Drastic improvement in the constellation was experimentally con...
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 ...

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