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The performance of dual-carrier 400G solutions based on three high-order quadrature amplitude modulation (QAM) formats (8/16/32-QAM) is investigated on the same platform. We first study the benefit and penalty differences of Gray and differential coding, and then experimentally compare OSNR sensitivities and transmission performance using flexible transceiver configuration and the same EDFA-only SSMF...
We successfully transmitted 100-GHz-grid, 8 channels single-carrier 515.2-Gb/s super-Nyquist signal over 2800-km SMF-28 with EDFA-only amplification. Record all-ETDM-based 136-Gbaud PDM-QPSK is also generated and coherently detected.
We demonstrated that simple pre-filtering at the transmitter to constrain the channel bandwidth together with a maximum a posteriori probability (MAP) detection algorithm can significantly improve spectral efficiency (SE). 96 × 100-Gb/s bandwidth-constrained polarization-division-multiplexing return- to-zero-QPSK channels were transmitted with 300% SE over 10 610 km using 52-km spans of 150-μ m 2...
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