DSP-Enabled Frequency Locking for Near-Nyquist Spectral Efficiency Superchannels utilizing Integrated Photonics. - Jeffrey Rahn; Lee Dardis; David Krause; Mark Rice; Chris Berry; Ales Kumpera; Alan Nilsson; Xian Xu; Kevin Croussore; Parmijit Samra; Kenneth Weidner; Zulfikar Morbi; et al. (OFC, 2018)