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Journals and Conferences
Coherent optical transmission allows for improved bandwidth utilization and impairment compensation of existing optical fiber links and is a key for future communication systems with transmission rates of 112 Gb/s and above. In recent years quadrature phase shift keying (QPSK) was the preferred modulation format because of its robustness on long-haul links… (More)
A multiplier-free phase estimation algorithm based on the barycentre approach for coherent QPSK detection is presented. A selectivity mechanism was developed that significantly improved its performance. In addition to recently published measurement results, theoretical background and new simulation results are presented.
Coherent fiberoptic transmission with synchronous detection of 4, 8 or more bit/symbol enhances spectral efficiency. It relies on polarization-division multiplexing (PDM) and quadrature phase shift keying (QPSK) or higher-order quadrature amplitude modulation (QAM). A coherent polarization diversity, in-phase and quadrature receiver detects the optical… (More)