D. Pan, C. Li, Y. Feng, J. Yuan, X. Tang, and X. Zhang, "Carrier phase estimation using digital pilot-tone in a faster than Nyquist WDM transmission system," in Asia Communications and Photonics Conference, ACPC 2015, November 19, 2015 - November 23, 2015, Hong kong, 2015, p. Huawei; IEEE Photonics Society; Luster LightTech Inc.; OSA; SPIE.