1. J. Peter, Winzer and Rene´-Jean Essiambre, Advanced optical modulation formats. Proc. IEEE 94(5), 952–985 (2006)
2. J. Yu et al., Ultra-high-capacity DWDM transmission system for 100G and Beyond. IEEE Commun. Mag. 48(3), S56–S64 (2010)
3. T. Sakamoto et al., Electro-Optic Synthesis of 8PSK by Quad-Parallel Mach-Zehnder Modulator, OFC’09, Paper no. OTuG4
4. T. Sakamoto et al., High-bit-rate Optical QAM, OFC‘09, Paper no. OWG5
5. A.H. Gnauck et al., 10 × 112 Gb/s PDM 16-QAM Transmission Over 630 km of Fiber with 6.2-b/s/Hz Spectral Efficiency, Proc. OFC 2009, Paper no. PDPB8