22 January 2010 Capacity achieving modulation format for high-speed optical networks
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In recent years, we have witnessed an increased demand on optical-networks transmission-capacities due to the growing popularity of the Internet and multimedia in everyday life. According to industry expert estimates, 1Tb/s-Ethernet should be standardized by the year 2012-2013. To this end, we propose a non-uniform modulation format that achieves the channel capacity for SNRs of up to 25dB. The proposed modulation format is optimized for ASE-noise-dominated channels and can achieve 400Gb/s data rate per polarization utilizing the currently-available components operating at 50-GSymbols/s. One major benefit of the current scheme is that it is an affordable upgrade to the current systems.
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Hussam G. Batshon, Ivan B. Djordjevic, Lei Xu, Ting Wang, "Capacity achieving modulation format for high-speed optical networks", Proc. SPIE 7621, Optical Metro Networks and Short-Haul Systems II, 76210M (22 January 2010); doi: 10.1117/12.841367; https://doi.org/10.1117/12.841367

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