Narrowband 2 gbit/s quaternary intensity modulation based on duobinary modulation in two polarizations with unequal amplitudes
S.K. Ibrahim, S. Bhandare, R. Noé, in: 2006 OPTICAL FIBER COMMUNICATION CONFERENCE/NATIONAL FIBER OPTIC ENGINEERS CONFERENCE, VOLS 1-6, 2006, pp. 1498–1500.