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Optical technology is one of the key technologies that have been widely used for communication, computing and sensing. By utilizing different degrees of freedom for photon, optical signals can be detected and processed in different dimensions including amplitude, phase, polarization, time, frequency, and spatial mode. Multidimensional signal processing technologies have thus been broadly studied for improving the performance of communication, sensing and even computing systems. Recently, innovative optical signal processing methods and devices have been emerged to serve those needs driven by applications including but not limited to optical fiber transmission, supercontinuum generation, phase conjugation, free space optical communication, optical beamforming, photonic integration, fiber amplification, pose estimation and so on. This Special Issue aims to explore those emerging and enabling technologies of signal processing methods and devices for optical communication, optical computing, and optical sensing. The Special Issue consists of two review papers, one communication and seven articles within the areas of optical fiber transmission, specialty fiber design, 3D pose estimation, free space communication, digital signal processing, as well as photonic integration. Optical signal processing powered next generation communication, computing and sensing can be highly expected.

Optical communications. --- Communications, Optical --- Light communications --- Photonics --- Telecommunication

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Optical fiber communication industry has gained unprecedented opportunities and achieved rapid progress in recent years. However, with the increase of data transmission volume and the enhancement of transmission demand, the optical communication field still needs to be upgraded to better meet the challenges in the future development. Artificial intelligence technology in optical communication and optical network is still in its infancy, but the existing achievements show great application potential. In the future, with the further development of artificial intelligence technology, AI algorithms combining channel characteristics and physical properties will shine in optical communication. This reprint introduces some recent advances in optical fiber communication and optical network, and provides alternative directions for the development of the next generation optical fiber communication technology.

Research & information: general --- Physics --- optical communication --- frame transmission --- synchronization word --- blind recognition --- Hough transform --- machine learning --- optical communications --- patent analysis --- network analysis --- technical analysis --- fiber nonlinearities --- deep learning (DL) --- artificial intelligence (AI) --- BPSK-VSB --- BPSK-SSB --- fiber transmission --- optical neural networks --- time lens --- fiber --- dispersion Fourier transform --- high-flux imaging --- classification --- cancer cell recognition --- photon time stretching (PTS) --- passive optical networks --- laser tuning time --- TWDM --- Dynamic Bandwidth Allocation --- optical access networks --- scheduling --- FSOC system --- omnidirectional communication --- miniaturization --- ASE noise --- ICC --- DWDM-FSO/PON optical fiber network --- hybrid OOK/M-ary DPPM-M-PAPM --- hybrid fiber FSO (HFFSO) link --- n/a

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This book explores the enabling technology in optical fiber communications. It focuses on the state-of-the-art advances from fundamental theories, devices, and subsystems to networking applications as well as future perspectives of optical fiber communications. The topics cover include integrated photonics, fiber optics, fiber and free-space optical communications, and optical networking.

spectral shaping --- photonic crystal fiber cascade --- zero-dispersion frequencies spacing --- supercontinuum generation --- virtual network embedding --- converged optical networks --- network slicing --- machine learning --- software-defined network --- optical waveguide --- silicon photonics --- silicon nitride --- optical polarization --- bipolar --- optical code division multiple access --- electro-optical modulator --- free-space optics communication --- FiWi access network --- energy efficiency --- power over fiber --- TWDM-PON --- delay analysis --- frequency modulated continuous-wave (FMCW) --- light detection and ranging (LiDAR) --- instantaneous frequency --- coherent optical spectrum analyzer (COSA) --- time-frequency curve --- microstructured optical fiber --- optical fiber sensors --- refractive index sensor --- surface plasmon resonance --- optical fiber communication --- electrical dispersion compensation --- multi-channel digital backpropagation --- equalization-enhanced phase noise --- achievable information rates --- elastic optical network --- invalid spectrum rate --- advanced reservation --- defragmentation --- blocking probability --- spectrum alignment rate --- VCSEL --- neural network-based equalization --- Volterra series-based equalization --- lanthanum-aluminum silicate glass --- polarization-maintaining fiber --- fiber Bragg grating --- Sagnac interferometer --- fluorinated polyimide film --- humidity hysteresis --- optical frequency domain reflectometry --- position deviation compensation --- sub-millimeter spatial resolution --- analysis --- FPGA --- GPON --- MongoDB --- storing --- fiber optics communications --- optical security and encryption --- phase fluctuations --- Elastic Optical Network --- space division multiplexing --- routing --- coherent optical communication --- offset-quadrature amplitude modulation-based filter-bank multicarrier (FBMC/OQAM) --- blind phase noise compensation --- inter-carrier-interference (ICI) --- discrete cosine transform (DCT) --- Brillouin --- ultrafast --- distributed sensing --- pump pulse array --- resolution enhancement --- SNR --- n/a

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In the past few decades, the optical communication industry has explored multiple degrees of freedom of the photon, such as time, wavelength, amplitude, phase, polarization, and space, to significantly reduce the cost/bit of data transmission by increasing the capacity per fiber through multiplexing technology and by reducing the size and power through electronic and photonic integration. This book aims to explore the latest advancements in this industry, including the technologies in devices, systems, and network levels with applications from short-reach chip-to-chip interconnections to long-haul backbone communications at the trans-oceanic distance.

Telecommunication.