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We report the successful transmission of 64 Tb/s capacity (640\,×\,107 Gb/s with 12.5 GHz channel spacing) over 320 km reach utilizing 8-THz of spectrum in theC+ L-bands at a net spectral efficiency of 8 bit/s/Hz. Such a result is accomplished by the use of raised-cosine pulse-shaped PDM-36QAM modulation, intradyne detection, both pre- and post-transmission digital equalization, and ultra-large-area fiber. We discuss in detail the digital modulation technology and signal processing algorithms used in the experiment, including a new two-stage, blind frequency-search-based frequency-offset estimation algorithm and a more computationally efficient carrier-phase recovery algorithm.
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Zhou et al. (2011) studied this question.
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