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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)

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Liquid Crystal on Silicon (LCoS) has become one of the most widespread technologies for spatial light modulation in optics and photonics applications. These reflective microdisplays are composed of a high-performance silicon complementary metal oxide semiconductor (CMOS) backplane, which controls the light-modulating properties of the liquid crystal layer. State-of-the-art LCoS microdisplays may exhibit a very small pixel pitch (below 4 ?m), a very large number of pixels (resolutions larger than 4K), and high fill factors (larger than 90%). They modulate illumination sources covering the UV, visible, and far IR. LCoS are used not only as displays but also as polarization, amplitude, and phase-only spatial light modulators, where they achieve full phase modulation. Due to their excellent modulating properties and high degree of flexibility, they are found in all sorts of spatial light modulation applications, such as in LCOS-based display systems for augmented and virtual reality, true holographic displays, digital holography, diffractive optical elements, superresolution optical systems, beam-steering devices, holographic optical traps, and quantum optical computing. In order to fulfil the requirements in this extensive range of applications, specific models and characterization techniques are proposed. These devices may exhibit a number of degradation effects such as interpixel cross-talk and fringing field, and time flicker, which may also depend on the analog or digital backplane of the corresponding LCoS device. The use of appropriate characterization and compensation techniques is then necessary.

n/a --- aberration compensation --- holographic and volume memories --- achromatic lens --- head-up displays --- phase characterization --- holographic display --- spatial resolution --- spatial light modulator --- zoom lens --- soliton --- transmission matrix --- head-mounted displays --- diffraction --- parallel-aligned --- liquid-crystal on silicon --- phase measurement --- multimode fiber --- digital holography --- chromatic aberration --- multiorder diffractive lens --- holography --- phase accuracy --- interference --- computer generated hologram --- optical manipulation --- speckle suppression --- phase modulation --- transparent mode --- light scattering --- ferroelectric --- phase change --- liquid-crystal-on-silicon --- imaging systems --- Liquid Crystal on Silicon display --- diffractive optical element --- liquid crystals --- spatially anamorphic phenomenon --- calibration --- head-up display --- helix-free --- phase precision and stability --- kinoform --- spatial light modulators --- photopolymer --- diffractive optics --- mode division multiplexing --- liquid crystal on silicon device --- augmented reality displays --- holographic data storage --- liquid crystal spatial light modulator --- harmonic lens --- fringing field effect --- liquid crystal

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Optics and photonics are among the key technologies of the 21st century, and offer potential for novel applications in areas such as sensing and spectroscopy, analytics, monitoring, biomedical imaging/diagnostics, and optical communication technology. The high degree of control over light fields, together with the capabilities of modern processing and integration technology, enables new optical measurement systems with enhanced functionality and sensitivity. They are attractive for a range of applications that were previously inaccessible. This Special Issue aims to provide an overview of some of the most advanced application areas in optics and photonics and indicate the broad potential for the future.

Technology: general issues --- optical --- electric-field --- sensor --- measurement --- transient voltage --- AC power grid --- Pockels effect --- dermatoscopy --- skin screening --- biomedical imaging --- fiber optic sensor --- Sagnac loop --- intensity-modulated --- DWDM --- strain sensor --- structural health monitoring (SHM) --- functionalized carbon structure (FCS) --- carbon reinforced concrete (CRC) --- fiber optic sensor (FOS) --- optical glass fiber --- wavefront sensor --- spatial light modulator --- contour-sum method --- topological charge --- orbital angular momentum --- optical coherence tomography --- Monte Carlo simulation --- structural imaging --- functional sensing --- optical scatterometry --- inverse problem --- profile reconstruction --- dependence analysis --- data refinement --- electro-optic dual-comb interferometry --- laser Doppler velocimetry --- Traceability --- sub-nanosecond laser --- high peak power --- Nd:YVO4 --- stimulated Raman scattering (SRS) --- thermal fracture --- wireless NoC (WiNoC) --- graphene based WiNoCs (GWiNoCs) --- wireless nanosensor networks (WNSNs) --- surface plasmon polariton (SPP) --- GFET --- multiple-input-multiple-output (MIMO) --- graphennas --- THz transceiver --- Mode Division Multiplexing (MDM) --- Few-Mode Fiber (FMF) --- principle mode groups (PMG) --- Bragg grating (BG) --- multi-mode fiber bragg grating --- multi-parameter sensing --- DAS --- fiber optic sensing --- train tracking --- pattern recognition --- hybrid lens --- optical wireless communications --- Li-Fi --- freeform lens --- optic design --- rotary interfaces --- rotary joint --- wireless rotary electrical interface --- rotating electrical connectors --- full-duplex data transfer --- Gigabit-Ethernet --- industrial communications --- real-time --- pathogen detection --- microfluidics --- image processing --- computational algorithms --- integrated optics and photonics --- integrated polymer optics --- organic laser --- integration --- polymeric waveguide --- Lab-on-a-Chip --- fiber optical sensing --- biosensing --- optofluidics --- integrated optics and photoncis --- optical analytics --- medical imaging and diagnostics --- optical communication technology --- distributed sensing

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Sonic/phononic crystals termed acoustic/sonic band gap media are elastic analogues of photonic crystals and have also recently received renewed attention in many acoustic applications. Photonic crystals have a periodic dielectric modulation with a spatial scale on the order of the optical wavelength. The design and optimization of photonic crystals can be utilized in many applications by combining factors related to the combinations of intermixing materials, lattice symmetry, lattice constant, filling factor, shape of the scattering object, and thickness of a structural layer. Through the publications and discussions of the research on sonic/phononic crystals, researchers can obtain effective and valuable results and improve their future development in related fields. Devices based on these crystals can be utilized in mechanical and physical applications and can also be designed for novel applications as based on the investigations in this Special Issue.

optical force --- photonic crystal cavity --- particle trapping --- optomechanical sensing --- polarization converter --- photonic crystal fiber --- square lattice --- extinction ratio --- polarization splitter --- dual-core photonic crystal fiber --- coupling characteristics --- phononic crystal --- auxetic structure --- star-shaped honeycomb structure --- wave propagation --- orbital angular momentum --- modal dispersion --- stress-induced birefringence --- finite element method --- mode-division multiplexing --- Erbium-doped fiber amplifier --- photonic crystal fibers --- cylindrical lens --- photonic nanojet --- graded-index --- vibration energy harvester --- defect bands --- piezoelectric material --- magnetostrictive material --- output voltage and power --- locally resonant --- band gap --- differential quadrature method --- direct laser writing --- KTP --- nonlinear optics --- photonic coupling --- energy harvesting --- defect modes --- phononic crystals (PCs) --- colloidal photonic crystals --- tunable photonic band gaps --- anti-counterfeiting --- coupled elastic waves --- laminated piezoelectric phononic crystals --- arbitrarily anisotropic materials --- band tunability --- electrical boundaries --- dispersion curves --- photonic crystals --- photonic bandgaps --- polymer materials --- acoustic metamaterial --- effective medium --- bubble resonance --- negative modulus --- graphene --- kerr effect --- optical switch --- photonic band gap --- photonic crystal --- microwave photonics --- optical frequency combs --- waveguide --- complete PBG --- PDOS --- TE --- TM --- beam shaping --- angular filtering --- autocloning --- multilayered structures --- sensor --- sensitivity --- figure of merit --- n/a

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Optics and photonics are among the key technologies of the 21st century, and offer potential for novel applications in areas such as sensing and spectroscopy, analytics, monitoring, biomedical imaging/diagnostics, and optical communication technology. The high degree of control over light fields, together with the capabilities of modern processing and integration technology, enables new optical measurement systems with enhanced functionality and sensitivity. They are attractive for a range of applications that were previously inaccessible. This Special Issue aims to provide an overview of some of the most advanced application areas in optics and photonics and indicate the broad potential for the future.

Technology: general issues --- optical --- electric-field --- sensor --- measurement --- transient voltage --- AC power grid --- Pockels effect --- dermatoscopy --- skin screening --- biomedical imaging --- fiber optic sensor --- Sagnac loop --- intensity-modulated --- DWDM --- strain sensor --- structural health monitoring (SHM) --- functionalized carbon structure (FCS) --- carbon reinforced concrete (CRC) --- fiber optic sensor (FOS) --- optical glass fiber --- wavefront sensor --- spatial light modulator --- contour-sum method --- topological charge --- orbital angular momentum --- optical coherence tomography --- Monte Carlo simulation --- structural imaging --- functional sensing --- optical scatterometry --- inverse problem --- profile reconstruction --- dependence analysis --- data refinement --- electro-optic dual-comb interferometry --- laser Doppler velocimetry --- Traceability --- sub-nanosecond laser --- high peak power --- Nd:YVO4 --- stimulated Raman scattering (SRS) --- thermal fracture --- wireless NoC (WiNoC) --- graphene based WiNoCs (GWiNoCs) --- wireless nanosensor networks (WNSNs) --- surface plasmon polariton (SPP) --- GFET --- multiple-input-multiple-output (MIMO) --- graphennas --- THz transceiver --- Mode Division Multiplexing (MDM) --- Few-Mode Fiber (FMF) --- principle mode groups (PMG) --- Bragg grating (BG) --- multi-mode fiber bragg grating --- multi-parameter sensing --- DAS --- fiber optic sensing --- train tracking --- pattern recognition --- hybrid lens --- optical wireless communications --- Li-Fi --- freeform lens --- optic design --- rotary interfaces --- rotary joint --- wireless rotary electrical interface --- rotating electrical connectors --- full-duplex data transfer --- Gigabit-Ethernet --- industrial communications --- real-time --- pathogen detection --- microfluidics --- image processing --- computational algorithms --- integrated optics and photonics --- integrated polymer optics --- organic laser --- integration --- polymeric waveguide --- Lab-on-a-Chip --- fiber optical sensing --- biosensing --- optofluidics --- integrated optics and photoncis --- optical analytics --- medical imaging and diagnostics --- optical communication technology --- distributed sensing --- optical --- electric-field --- sensor --- measurement --- transient voltage --- AC power grid --- Pockels effect --- dermatoscopy --- skin screening --- biomedical imaging --- fiber optic sensor --- Sagnac loop --- intensity-modulated --- DWDM --- strain sensor --- structural health monitoring (SHM) --- functionalized carbon structure (FCS) --- carbon reinforced concrete (CRC) --- fiber optic sensor (FOS) --- optical glass fiber --- wavefront sensor --- spatial light modulator --- contour-sum method --- topological charge --- orbital angular momentum --- optical coherence tomography --- Monte Carlo simulation --- structural imaging --- functional sensing --- optical scatterometry --- inverse problem --- profile reconstruction --- dependence analysis --- data refinement --- electro-optic dual-comb interferometry --- laser Doppler velocimetry --- Traceability --- sub-nanosecond laser --- high peak power --- Nd:YVO4 --- stimulated Raman scattering (SRS) --- thermal fracture --- wireless NoC (WiNoC) --- graphene based WiNoCs (GWiNoCs) --- wireless nanosensor networks (WNSNs) --- surface plasmon polariton (SPP) --- GFET --- multiple-input-multiple-output (MIMO) --- graphennas --- THz transceiver --- Mode Division Multiplexing (MDM) --- Few-Mode Fiber (FMF) --- principle mode groups (PMG) --- Bragg grating (BG) --- multi-mode fiber bragg grating --- multi-parameter sensing --- DAS --- fiber optic sensing --- train tracking --- pattern recognition --- hybrid lens --- optical wireless communications --- Li-Fi --- freeform lens --- optic design --- rotary interfaces --- rotary joint --- wireless rotary electrical interface --- rotating electrical connectors --- full-duplex data transfer --- Gigabit-Ethernet --- industrial communications --- real-time --- pathogen detection --- microfluidics --- image processing --- computational algorithms --- integrated optics and photonics --- integrated polymer optics --- organic laser --- integration --- polymeric waveguide --- Lab-on-a-Chip --- fiber optical sensing --- biosensing --- optofluidics --- integrated optics and photoncis --- optical analytics --- medical imaging and diagnostics --- optical communication technology --- distributed sensing