Abstract
We report the successful transmission of 64 Tb/s capacity (640$\,\times\,$107 Gb/s with 12.5 GHz channel spacing) over 320 km reach
utilizing 8-THz of spectrum in the ${\rm C}+{\rm L}$-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.
© 2011 IEEE
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