Optics Letters · 2017 · 13 citations · 9 references
EngineeringCommunicationElectrical EngineeringDigital CommunicationPhotonicsWireless CommunicationsFiber OpticsFiber-optic CommunicationInterference ManagementModulationOptical Communication SystemsOptical FibersInterferenceMulti-input Multi-output SystemsOptical Transmission SystemsSignal-to-noise RatioSignal-to-noise Ratio ImprovementSingle-mode FibersSpacingsSpectral Efficiency
We demonstrate faster-than-Nyquist (FTN) transmission with a novel mitigation scheme of intercarrier interference. To the best of our knowledge, it is the first experimental demonstration of FTN PDM-16QAM transmission over standard single mode fiber (SSMF). Due to the use of maximum likelihood sequence detection and multi-input multi-output processing for severely overlapped Nyquist-PDM-16QAM carriers, 5.4-dB optical signal-to-noise ratio improvement is experimentally observed under the scenario of 2×16-GBd PDM-16QAM back-to-back transmission with a carrier spacing of 15 GHz. A net spectral efficiency up to 7.68 b/s/Hz is achieved by transmission of a 15-GHz spaced dual-carrier superchannel over 960-km SSMF, with hard decision forward error correction taken into account. Furthermore, FTN superchannel transmission with carrier spacings of 14 and 15 GHz are successfully realized over 960- and 1920-km SSMFs, respectively.
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20 Tbit/s Transmission Over 6860 km With Sub-Nyquist Channel Spacing
J.-X. Cai, Carl Davidson, A. Lucero et al. · Journal of Lightwave Technology · 2011 · 83 citations