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We demonstrate for the first time 32 GBd 64-QAM signal generation without the usage of DACs. The dual-polarization 64-QAM signal is transmitted error-free over 80 km of SSMF with 7.8 pJ/bit record low energy consumption.
We experimentally investigate the characteristics of 126-Gb/s coded 6PolSK-QPSK signals in the nonlinear transmission regime and demonstrate that required OSNR improvement is increasing with fiber-launch power due to coded modulation as well as digital back propagation.
To satisfy the increasing capacity demand in today's networks, in particular exceeding 100 Tbit/s per fiber, pose a severe challenge. This paper names technology options to meet this challenge and describes in particular an example of a 4D modulation format in more detail.
An 8 × 448-Gb/s polarization-division-multiplexing 16-ary quadrature amplitude modulation wavelength-division multiplexing signal with 4-b/s/Hz spectral efficiency is generated using optical time-division multiplexing and real-time field-programmable gate array-based generation of four-level in-phase and quadrature modulator driving signals. Transmission performance over 250-km ultralarge effective...
We present a serial 10.2-Tb/s transmission-system using a 1.28-TBd RZ-16-QAM signal, polarization multiplexing and ultra-fast coherent demultiplexing. Considering FEC-overhead, we achieve a record error-free net data rate of 9.5-Tb/s and transmission over 29-km.
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