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We propose coded-modulation schemes employing three-dimensional constellations and component nonbinary LDPC codes to enable high-speed optical communications. Compared to polarization-division-multiplexed QPSK, the proposed scheme improves coding gain by ~2dB even at the BER of 10-6.
This paper describes experimental demonstration of 50GHz ROADM tolerance for a realtime, single-carrier, 127-Gb/s coherent PM-QPSK system. 10 WSSs are cascaded over 1000km NDSF and <;0.5dB OSNR penalty is measured for the worst case. Cascading limit is also predicted.
We experimentally study 40 Gb/s DPSK systems over 1200 km NZ-DSF with no in-line compensation. The best performing system splits the compensation between Tx and Rx and has >3 dB margin over the FEC threshold.
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