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: A software-defined optical receiver is implemented on an off-the-shelf commercial graphics processing unit (GPU). The receiver provides real-time signal processing functionality to process 1 GBaud minimum phase (MP) 4-,… Click to show full abstract
: A software-defined optical receiver is implemented on an off-the-shelf commercial graphics processing unit (GPU). The receiver provides real-time signal processing functionality to process 1 GBaud minimum phase (MP) 4-, 8-, 16-, 32-, 64-, 128-ary quadrature amplitude modulation (QAM) as well as geometrically shaped (GS) 8- and 128-QAM signals using Kramers-Kronig (KK) coherent detection. Experimental validation of this receiver over a 91 km field-deployed optical fiber link between two Tokyo locations is shown with detailed optical signal-to-noise ratio (OSNR) investigations. A net data rate of 5 Gbps using 64-QAM is demonstrated. 6. Conclusion A commercial off-the-shelf GPU is used for real-time digital signal processing of minimum-phase 4-, 8-, 16-, 32-, 64-, and 128-QAM as well as geometrically-shaped 8-QAM and 128-QAM signals detected with a KK coherent receiver [15]. This real-time, flexible, multi-modulation format
Journal Title: Optics Express
Year Published: 2022
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