@article{38228, author = {{Hoffmann, Sebastian and Peveling, Ralf and Pfau, Timo and Adamczyk, Olaf and Eickhoff, Ralf and NoƩ, Reinhold}}, journal = {{IEEE Photonics Technology Letters}}, number = {{3}}, pages = {{137--139}}, title = {{{Multiplier-Free Real-Time Phase Tracking for Coherent QPSK Receivers}}}, doi = {{10.1109/LPT.2008.2009228}}, volume = {{21}}, year = {{2009}}, }