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WDM Transmission using PDM-8QAM-OFDM and PDM-16QAM-OFDM modulations over 10,181km and 4,242km are successfully demonstrated. Up to 0.5dB Q-factor improvement can be achieved from nonlinearity compensation for self-phase modulation (SPM) using back-propagation method.
The first lightwave-centralized WDM-OFDM-PON architecture with OFDM re-modulation and a coherent-receiver-OLT is demonstrated. Both downstream and re-modulated upstream 10Gbit/s OFDM-16QAM is successfully transmitted over 25km-SSMF with 10dB power-margin and negligible re-modulation and transmission penalties.
Transmission of 11.5-Tb/s (115×120.5-Gb/s) is performed over 10,181km using PDM-8QAM-OFDM modulation, 60.6km hybrid fiber spans and EDFAs. Achieved spectral efficiency of 4b/s/Hz is the highest reported to date for WDM transmission over more than 10,000km.
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