1. [1] A. Sano, T. Kobayashi, K. Ishihara, H. Masuda, S. Yamamoto, K. Mori, E. Yamazaki, E. Yoshida, Y. Miyamoto, T. Yamada, and H. Yamazaki, “240-Gb/s polarization-multiplexed 64-QAM modulation and blind detection using PLC-LN hybrid integrated modulator and digital coherent receiver,” Proc. ECOC 2009, Paper PD2.2, Sept. 2009.
2. [2] A. Sano, H. Masuda, T. Kobayashi, M. Fujiwara, K. Horikoshi, E. Yoshida, Y. Miyamoto, M. Matsui, M. Mizoguchi, H. Yamazaki, Y. Sakamaki, and H. Ishii, “Ultra-high capacity WDM transmission using spectrally-efficient PDM 16-QAM modulation and C- and extended L-band wideband optical amplification,” J. Lightwave Technol., vol.29, no.4, pp.578-586, Feb. 2011.
3. [3] P. Ciblat and M. Ghogho, “Blind NLLS carrier frequency-offset estimation for QAM, PSK, and PAM modulations: Performance at low SNR,” IEEE Trans. Commun., vol.54, no.10, pp.1725-1730, Oct. 2006.
4. [4] M. Selmi, Y. Jaouën, and P. Ciblat, “Accurate digital frequency offset estimator for coherent PolMux QAM transmission systems,” Proc. ECOC 2009, paper P3.08, Sept. 2009.
5. [5] Y. Cao, S. Yu, Y. Chen, Y. Gao, W. Gu, and Y. Ji, “Modified frequency and phase estimation for M-QAM optical coherent detection,” Proc. 36th European Conference and Exhibition on Optical Communication, pp.1-3, 2010.