M. El-Darawy, T. Pfau, C. Wordehoff, S. Hoffmann, R. Noé
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Realtime QPSK transmission with an integrated coherent optical receiver frontend
An integrated coherent receiver frontend is compared to a fiber-pigtailed 90° hybrid in a realtime QPSK transmission experiment. Additionally the impact of carrier recovery filter width and phase deviations in the 90° hybrid is analyzed.