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We demonstrate 43-Tbit/s transmission over 67.4-km seven-core fiber using a single source. Each of the 6 outer cores carries 6 Nyquist-WDM channels using 320-Gbaud Nyquist-OTDM-PDM-QPSK 330-GHz spaced, and the center core carries 10-GHz clock pulses.
We confirm experimentally that 100-Gbit/s digital coherent PDM-QPSK exhibits high tolerance against at least 50-ps DGD and 1800-ps^2 SOPMD in a large-PMD field testbed comprising 677 km of installed DSF.
We succeed in the long-haul (1,280km) transmission of a 120-Gb/s PDM 64-QAM signal. The transmission distance was extended from 800 km to 1,280 km by a multi-stage nonlinear compensation technique that mitigates the intra-channel nonlinearities.
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 demonstrate the record capacity-distance product of 48.2 Petabit/s.km by using 111-Gb/s no-guard-interval coherent OFDM with 2-b/s/Hz spectral efficiency.
43-Gbit/s PMD-limited performances of CS-RZ and NRZ have been verified in a joint field trail. CS-RZ showed better performance than NRZ. 2/sup nd/-order PMD of 200 ps/sup 2/ was accommodated in principal state of polarization transmission with FEC.
PMD induced system outage probabilities have been measured in a joint field trial of NTT and DT. For outage evaluation 43-Gbit/s CS-RZ signals of the NTT WDM system were transmitted over selected high-PMD fiber links of DT's fiber network.
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