5 February 2013 Nyquist-WDM transmission of 7 x 192 Gb/s PDM 16-QAM signals using high-speed DACs operating at 42 GS/s
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Abstract
We report Nyquist-wavelength-division-multiplexed (Nyquist-WDM) seven-channel 192-Gb/s polarization-divisionmultiplexed 16-QAM transmission. The transmitter comprises high-speed digital-to-analog converters (DACs) fabricated with 0.5-μm indium phosphide (InP) heterojunction bipolar transistors and an FPGA-based multi-channel digital signal generator, and enables us to perform transmitter-side digital signal processing (DSP) for spectrally efficient WDM transmission. The transmitter generated 24-Gbaud electrical waveforms for optical 16-QAM signals with a digital pre-filter. Using low-loss and low-nonlinear pure silica core fiber, we achieved 25-GHz-spaced seven-channel 192 Gb/s transmission distance of 480 km with a spectral efficiency of 7.17 b/s/Hz.
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Shogo Yamanaka, Takayuki Kobayashi, Akihide Sano, Akihiko Matsuura, Yutaka Miyamoto, Munehiko Nagatani, Hideyuki Nosaka, "Nyquist-WDM transmission of 7 x 192 Gb/s PDM 16-QAM signals using high-speed DACs operating at 42 GS/s", Proc. SPIE 8646, Optical Metro Networks and Short-Haul Systems V, 86460O (5 February 2013); doi: 10.1117/12.2011002; https://doi.org/10.1117/12.2011002
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