@article{38442, author = {{Hoffmann, Sebastian and Bhandare, Suhas and Pfau, Timo and Adamczk, Olaf and Woerdehoff, Christian and Peveling, Ralf and Porrmann, Mario and NoƩ, Reinhold}}, issn = {{1041-1135}}, journal = {{IEEE PHOTONICS TECHNOLOGY LETTERS}}, number = {{17-20}}, pages = {{1569--1571}}, title = {{{Frequency and Phase Estimation for Coherent QPSK Transmission With Unlocked DFB Lasers}}}, doi = {{10.1109/LPT.2008.928846}}, volume = {{20}}, year = {{2008}}, }