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Issues that need to be addressed for long-haul SDM transmission are discussed. Newly developed advanced MIMO processing schemes are presented that achieve low-complexity mode dispersion compensation and tolerance enhancement for mode dependent loss.
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 demonstrated that impairments caused by chromatic dispersion, fiber nonlinearity, and the ASE of optical amplifiers were effectively suppressed using in-line PSA repeaters. Over 3200-km transmission of 28-Gb/s BPSK signal was achieved without dispersion compensation.
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 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.
This paper reviews 100-Gb/s/ch long-haul WDM transmission techniques based on no-guard-interval coherent optical orthogonal frequency-division multiplexing.
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