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Optical OFDM is a promising technology for highly spectrally efficient (SE) wavelength-division-multiplexing (WDM) system. Furthermore, the bit-rate 400 Gbit/s per WDM channel with SE of 8 bit/s/Hz is expected to be adopted for the next generation WDM system. For the application, optical OFDM is one of promising candidates because of the scalability for higher SE and higher bit-rate using multi-band...
We have successfully demonstrated 3 × 458-Gbit/s Optical Multi-band OFDM transmission over 160 km of SSMF with EDFA-only amplification at 50 GHz WDM spacing by utilizing narrowband optical filter.
Optical OFDM is one of promising technology to increase spectral efficiency. We explain the modulation scheme and WDM transmission experiments of 458 Gbit/s OFDM signal per WDM channel with 8 bit/s/Hz spectral efficiency.
The required resolution of digital-analog-converter for optical OFDM was evaluated through simulation and experiment. Signal degradation caused by quantization was independent of subcarrier modulation, and the performance improvement saturates with increasing bit resolution.
We propose a low-overhead method of polarization multiplexing in direct detection OFDM that requires no digital MIMO processing. Using 16QAM and only 31GHz bandwidth, 100 Gbps transmission over 80 km of SSMF is successfully demonstrated.
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