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We review bandwidth constraining and digital signal processing techniques for achieving high spectral efficiency optical fiber transmissions. We discuss advantages and disadvantages of three different combinations of adaptive equalization and sequence detection schemes, and show experimental demonstrations.
We review recent single-carrier 400G schemes based on high baud rate signals with different spectrum efficiency (SE) based on QPSK and 16QAM. The long-haul performances under different transmission conditions and modulation formats are studied. The digital signal processing for 400G signal recovery is also discussed.
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