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The rapid proliferation of the Internet has been driving communication networks closer and closer to their limits, while available bandwidth is disappearing due to an ever-increasing network load. Over the past decade, optical fiber communication technology has increased per fiber data rate from 10 Tb/s to exceeding 10 Pb/s. The major explosion came after the maturity of coherent detection and advanced digital signal processing (DSP). DSP has played a critical role in accommodating channel impairments mitigation, enabling advanced modulation formats for spectral efficiency transmission and realizing flexible bandwidth. This book aims to explore novel, advanced DSP techniques to enable multi-Tb/s/channel optical transmission to address pressing bandwidth and power-efficiency demands. It provides state-of-the-art advances and future perspectives of DSP as well.

equalization --- n/a --- space division multiplexing --- multi-input multi-output --- mode-division multiplexing --- mode-dependent loss --- caching --- neural network --- mitigation of optical transceiver impairments --- four-level pulse amplitude modulation --- least mean squares --- frequency-domain equalization --- nonlinearity compensation --- optical fiber communication --- optical communication --- modulators --- digital signal processing --- quadrature phase-shift keying --- space–time block-coding --- pointing error --- Device to Device --- fiber optics communications --- cycle-slip --- coherent communications --- coherent communication --- pluggable module --- recursive least squares --- data center interconnect --- average symbol length --- pulse position modulation–binary phase shift keying–subcarrier intensity modulation (PPM–BPSK–SIM) --- 400 Gigabit Ethernet --- direct detection --- QSFP-DD transceiver --- low-density parity-check (LDPC) --- coherent detection --- free space optical (FSO) --- carrier phase estimation --- optical communications --- bit error rate (BER) --- machine learning --- fiber optics links and subsystems --- short-reach optical links --- Indian Buffet Process --- pilot-aided-phase-unwrap --- space-time block-coding --- pulse position modulation-binary phase shift keying-subcarrier intensity modulation (PPM-BPSK-SIM)