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"Optical equipment"
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Fiber optic installer's field manual
\"A fully updated fiber optic cable installation guideExtensively revised to cover the latest technologiesand equipment, this portable tool shows you how toplan, install, and maintain a robust fiber optic networkto support today's high speed requirements. The emphasis is on practical, efficient installation techniques using current global industry standards. Detailed diagrams and step-by-step procedures walk you through the entire process. This completely up-to-date edition is an essential on-the-job reference.Fiber Optic Installer's Field Manual, Second Edition, covers: Properties of light Optical fiber Fiber optic cables Fiber optic cable procurement Safety precautions Handling fiber optic cable Outdoor fiber optic cable installation Indoor cable installation Fiber optic cable general installation guide Splicing and termination Patch cords and connectors Optical fiber power loss and measurement The OTDR and OSA Fiber optic installation tests Transceivers such as SFP and XFP WDM and other passive optical equipment SONET/SDH Ethernet over fiber Fiber system deployment Maintenance Emergency cable repair Network documentation Troubleshooting Design fundamentals Personnel Dark fiber leasing Global standards reference tables \"-- Provided by publisher.
Book
Optical payloads for space missions
Optical Payloads for Space Missions is a comprehensive collection of optical spacecraft payloads with contributions by leading international rocket-scientists and instrument builders.
* Covers various applications, including earth observation, communications, navigation, weather, and science satellites and deep space exploration
* Each chapter covers one or more specific optical payload
* Contains a review chapter which provides readers with an overview on the background, current status, trends, and future prospects of the optical payloads
* Provides information on the principles of the optical spacecraft payloads, missions' background, motivation and challenges, as well as the scientific returns, benefits and applications
eBook
The eye of war : military perception from the telescope to the drone
\"This project explores how technologies of perception -- the ability to detect and to avoid detection -- have transformed modern warfare. The book spans from the Renaissance, where the rationalization of vision and space started to influence military strategy, to the present day, where combatants increasingly face off in the perceptual realm of drones and satellites as much as the physical battlefield. Each chapter explores a different perceptual theme: sensing, imaging, mapping and hiding\"-- Provided by publisher.
Book
Microwave Photonics
Microwave photonics continues to see rapid growth, with the integration of optical fiber and wireless networks now a commercial reality. Such hybrid technology will lead to many innovative applications, including ultrawideband and ultrafast networks. This book systematically introduces key technologies and applications in microwave photonics, ranging from micro- and millimeter-wave to terahertz frequencies. Leading researchers share insights on overcoming current limitations and on future directions. Updated to reflect advances in the field, this edition includes new chapters on fiber Bragg gratings and ultrawide-band sub-THz photonic wireless links.
eBook
Opto-VLSI devices and circuits for biomedical and healthcare applications
\"The text comprehensively discusses the latest Opto-VLSI devices and circuits useful for healthcare and biomedical applications. It further emphasizes the importance of smart technologies such as artificial intelligence, machine learning, and the internet of things for the biomedical and healthcare industries\"-- Provided by publisher.
BOOK
All-optical spiking neurosynaptic networks with self-learning capabilities
Software implementations of brain-inspired computing underlie many important computational tasks, from image processing to speech recognition, artificial intelligence and deep learning applications. Yet, unlike real neural tissue, traditional computing architectures physically separate the core computing functions of memory and processing, making fast, efficient and low-energy computing difficult to achieve. To overcome such limitations, an attractive alternative is to design hardware that mimics neurons and synapses. Such hardware, when connected in networks or neuromorphic systems, processes information in a way more analogous to brains. Here we present an all-optical version of such a neurosynaptic system, capable of supervised and unsupervised learning. We exploit wavelength division multiplexing techniques to implement a scalable circuit architecture for photonic neural networks, successfully demonstrating pattern recognition directly in the optical domain. Such photonic neurosynaptic networks promise access to the high speed and high bandwidth inherent to optical systems, thus enabling the direct processing of optical telecommunication and visual data.
An optical version of a brain-inspired neurosynaptic system, using wavelength division multiplexing techniques, is presented that is capable of supervised and unsupervised learning.
Journal Article
A high bit rate free space optics based ring topology having carrier‐less nodes
A free space optics based ring topology that transmits full‐duplex data to four different nodes in the ring is proposed. The link is designed such that the four nodes do not require a local optical source to transmit the uplink data. A wavelength division multiplexed signal composed of four different wavelengths each modulated by the downlink baseband data using differential phase shift keying is transmitted towards the nodes. At each node, the downlink baseband data is extracted and the received optical pulses are remodulated by the uplink baseband data using on‐off keying modulation format. Each node has a data rate of 10 Gbps and is at a distance of 400 m from the consecutive node. The free space optical link is modelled on the basis of Gamma‐Gamma channel model under different turbulence conditions by considering the refractive index structure parameter values of 5×10−15, 5×10−13 and 5×10−12m−2/3. Bit error rate results are obtained for both the downlink and uplink channels. Finally, power budget analysis is presented to demonstrate the robustness of the link under different weather conditions.
Journal Article
Estimation of high-order aberrations and anisotropic magnification from cryo-EM data sets in RELION -3.1
Methods are presented that detect three types of aberrations in single-particle cryo-EM data sets: symmetrical and antisymmetrical optical aberrations and magnification anisotropy. Because these methods only depend on the availability of a preliminary 3D reconstruction from the data, they can be used to correct for these aberrations for any given cryo-EM data set, a posteriori . Using five publicly available data sets, it is shown that considering these aberrations improves the resolution of the 3D reconstruction when these effects are present. The methods are implemented in version 3.1 of the open-source software package RELION .
Journal Article
Synthetic three-dimensional atomic structures assembled atom by atom
A great challenge in current quantum science and technology research is to realize artificial systems of a large number of individually controlled quantum bits for applications in quantum computing and quantum simulation. Many experimental platforms are being explored, including solid-state systems, such as superconducting circuits
1
or quantum dots
2
, and atomic, molecular and optical systems, such as photons, trapped ions or neutral atoms
3
–
7
. The latter offer inherently identical qubits that are well decoupled from the environment and could provide synthetic structures scalable to hundreds of qubits or more
8
. Quantum-gas microscopes
9
allow the realization of two-dimensional regular lattices of hundreds of atoms, and large, fully loaded arrays of about 50 microtraps (or ‘optical tweezers’) with individual control are already available in one
10
and two
11
dimensions. Ultimately, however, accessing the third dimension while keeping single-atom control will be required, both for scaling to large numbers and for extending the range of models amenable to quantum simulation. Here we report the assembly of defect-free, arbitrarily shaped three-dimensional arrays, containing up to 72 single atoms. We use holographic methods and fast, programmable moving tweezers to arrange—atom by atom and plane by plane—initially disordered arrays into target structures of almost any geometry. These results present the prospect of quantum simulation with tens of qubits arbitrarily arranged in space and show that realizing systems of hundreds of individually controlled qubits is within reach using current technology.
Arbitrarily shaped, defect-free three-dimensional synthetic structures with up to 72 individually controlled atoms are assembled using holographic methods and moving tweezers.
Journal Article
Time-asymmetric loop around an exceptional point over the full optical communications band
Topological operations around exceptional points
-time-varying system configurations associated with non-Hermitian singularities-have been proposed as a robust approach to achieving far-reaching open-system dynamics, as demonstrated in highly dissipative microwave transmission
and cryogenic optomechanical oscillator
experiments. In stark contrast to conventional systems based on closed-system Hermitian dynamics, environmental interferences at exceptional points are dynamically engaged with their internal coupling properties to create rotational stimuli in fictitious-parameter domains, resulting in chiral systems that exhibit various anomalous physical phenomena
. To achieve new wave properties and concomitant device architectures to control them, realizations of such systems in application-abundant technological areas, including communications and signal processing systems, are the next step. However, it is currently unclear whether non-Hermitian interaction schemes can be configured in robust technological platforms for further device engineering. Here we experimentally demonstrate a robust silicon photonic structure with photonic modes that transmit through time-asymmetric loops around an exceptional point in the optical domain. The proposed structure consists of two coupled silicon-channel waveguides and a slab-waveguide leakage-radiation sink that precisely control the required non-Hermitian Hamiltonian experienced by the photonic modes. The fabricated devices generate time-asymmetric light transmission over an extremely broad spectral band covering the entire optical telecommunications window (wavelengths between 1.26 and 1.675 micrometres). Thus, we take a step towards broadband on-chip optical devices based on non-Hermitian topological dynamics by using a semiconductor platform with controllable optoelectronic properties, and towards several potential practical applications, such as on-chip optical isolators and non-reciprocal mode converters. Our results further suggest the technological relevance of non-Hermitian wave dynamics in various other branches of physics, such as acoustics, condensed-matter physics and quantum mechanics.
Journal Article