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We investigate long-haul WDM transmission using 538Gb/s PDM-64QAM single-carrier frequency-division-multiplexing (SC-FDM) signal with pilot tone. Assuming 20% FEC overhead, the longest transmission distance of 1200km at the spectral efficiency of 8.96b/s/Hz is achieved.
We demonstrate 45.2Tb/s 50-GHz-spaced WDM transmission over 240km (3 × 80km) in C-band using 538 Gb/s PDM-64QAM single-carrier frequency-division-multiplexed (SC-FDM) signal with digital pilot tone. Nonlinear tolerance is enhanced at spectral efficiency of 10b/s/Hz.
We demonstrate 25-GHz-spaced eleven-channel 171 Gb/s PDM 16-QAM transmission over 1440 km. 16-QAM signals were generated by high-speed digital-to-analog converters. We achieved a record spectral efficiency-distance product of 9216 b/s/Hz-km (6.4 b/s/Hz × 1440 km) in the 16-QAM format.
We demonstrate 8Tb/s DP-QPSK 50-GHz-spaced DWDM transmission over 457.6-km of installed DSF links with only EDFAs using digital coherent detection. This is the highest capacity field trial yet reported for a 127-Gb/s DP-QPSK DWDM system.
We demonstrated spectrally efficient (2-b/s/Hz) 1Tb/s DWDM transmission of 111 Gb/s no-guard-interval PDM CO-OFDM signals over DSFs with 50 GHz spacing. The record transmission distance of 2100 km in the 100-Gb/s-data-rate CO-OFDM systems was achieved.
This paper reviews recent progress in 100-Gb/s-class ultra-high speed optical OFDM transmission technologies. We describe system configuration based on optical multiplexing/demultiplexing and transmission performances.
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