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Thanks to the use of a digital multi-subcarrier architecture, we experimentally demonstrate a maximum reach increase of 11% for a 19×128Gbit/s PM-QPSK WDM comb with respect to an equivalent single-subcarrier system, achieving 14,100-km transmission over PSCF fiber with EDFA-only amplification.
We report the first experimental validation of the EGN-model. Using a PM-QPSK Nyquist-WDM transmission we confirm the enhanced accuracy of the EGN-model comparing maximum reach predictions with those of GN-model.
We derive capacity formulas for uncompensated links, showing that the launch power maximizing capacity is independent of link length and modulation format. We discuss the usable range of PM-QAM systems and validate analysis with simulations.
The use of NRZ, RZ and CSRZ modulation formats in an Ultra-Dense WDM (UDWDM) scenario at 40 Gbit/s is investigated. Narrow optical filtering at the receiver and at the transmitter, as well as orthogonal polarization launch of adjacent channels, is studied in order to improve spectral efficiency.
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