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NEC Dictionary Terms

MEMS fiber optic switch
A MEMS fiber optic switch is a microelectromechanical system (MEMS) device designed to selectively route optical signals between multiple fiber optic channels. These switches utilize miniature mechanical components, typically fabricated on a silicon...
vacuum chamber
A vacuum chamber is a sealed enclosure from which air and other gases are removed to create a low-pressure environment,...
GigE
GigE, short for gigabit Ethernet, refers to a standard for high-speed Ethernet communication, capable of transmitting data...
free-space optics
Free-space optics (FSO), also known as optical wireless communication or optical wireless networking, refers to the...
isolator
In the context of electronics and optics, an isolator refers to a device that allows the transmission of signals in one...
vibrational transition
A vibrational transition refers to a change in the vibrational energy of a molecule. Molecules consist of atoms that are...
thermocouple
A device composed of dissimilar metals that, when welded together, develop a small voltage dependent upon the relative...
sclerometer
An instrument used to test the hardness of various materials. It measures the pressure on a standard point that is necessary...
node
In a communications network, a point at which data are received or from which they are sent. Though the term often is used...
design and engineering consulting services
Design and engineering consulting services refer to professional services provided by specialized firms or individuals to...
machine vision system
A machine vision system is an integrated combination of hardware and software components designed to capture, process, and...
insertion loss
The total optical power loss caused by the insertion of an optical component such as a connector, splice or coupler into a...
Suits' model
Family of deterministic models of plant canopy reflectance that provides deterministic formulation for each necessary...
compound crosspoint
A device for obtaining very low crosstalk in a crosspoint by arranging two simple switches along different arms of a passive...
hyperspectral resolution
Hyperspectral resolution refers to the level of detail or granularity in the spectral information captured by a...
x-ray vacuum
The pressure in the gas region of an x-ray tube that has been reduced below 0.1 mm, the pressure necessary for the tube.
optical filter
An optical filter is a device that selectively transmits or blocks specific wavelengths, or colors, of light. Optical...
laser diode module
A laser diode module is a compact device that incorporates a laser diode, optics, and often other components into a single...
metaverse
The term "metaverse" refers to a collective virtual shared space, created by the convergence of virtually enhanced physical...
tissue optics
The study of the optical properties of living tissue. Increased understanding of the behavior of light in this varied,...
embedded vision
Embedded vision refers to the integration of computer vision technologies into various embedded systems, devices, or...
ring topology
A system of local area networking in which each node or station is connected to two others, ultimately forming a loop. Data...
SPIN
Acronym for self-aligned polysilicon interconnect N-channel. A metal-gate process that uses aluminum for the metal-oxide...
fiber-coupled photoconductive antenna
A fiber-coupled photoconductive antenna (FCPA) is a type of optoelectronic device that combines a photoconductive antenna...
integrated photonics
Integrated photonics is a field of study and technology that involves the integration of optical components, such as lasers,...
passive-matrix OLED display
An OLED display formed by creating an array of OLED pixels connected by intersecting anode and cathode conductors arranged...
photoelectric counter
A device used to count objects that pass a given point by allowing each object to obstruct a beam of light falling on a...
probe card
A probe card is a testing device used in the semiconductor manufacturing industry to evaluate and test the electrical...
edge-defined film-fed growth
Process for growth of solar cells that results in rectangular shapes consisting of many interconnected cells in a series or...
synchrotron
A synchrotron is a type of particle accelerator that uses magnetic fields to steer charged particles, typically electrons or...
borescope
A device for the internal inspection of hard-to-get-at mechanical parts, such as rifle barrels, sewer pipes, oil wells, or...
free-space optical interconnect
A type of internal photonic connection in an integrated circuit in which a holographic grating is used to focus light at...
neural network
A computing paradigm that attempts to process information in a manner similar to that of the brain; it differs from...
excitation potential
The amount of energy required to raise the energy level of an atom; a necessity if the atom is to radiate energy. High...
nanotube
A nanotube, also known as a nanotubule or simply a tube-like structure, is a nanoscale cylindrical structure composed of...
trunk
In a fiber optic communications network, a circuit that connects two switching centers and does not branch off to terminal...
cosmic ray telescope
A system consisting of two or more Geiger-Müller counters, connected in coincidence with their centers on an axis. The only...
internet of things
The internet of things (IoT) refers to a network of interconnected physical devices, vehicles, appliances, and other objects...
distributed feedback laser
A distributed feedback laser (DFB laser) is a type of semiconductor laser diode designed to emit coherent, narrow-bandwidth...
tee coupler
A passive coupler that connects three ports.
reflection grating
A reflection grating is an optical component that consists of a series of closely spaced, parallel reflecting surfaces or...
attenuation meter
A device used to measure power loss in fiber optic connectors, cables or systems.
Nichols radiometer
An instrument devised by Nichols and Hull for use in the measurement of radiation pressure. The device has two small...
frame
1. To center an image or place it in any part of the television screen desired. Also applies to stills. 2. A single image of...
optical theorem
A fundamental law of wave scattering theory that connects the extinction cross section of a scatterer to the real part of...
adapter
1. In optics, the housing, usually cylindrical, that contains the lenses and iris diaphragm of a camera. 2. In fiber optics,...
laser-induced fluorescence
Laser-induced fluorescence (LIF) is a spectroscopic technique that involves using a laser to excite molecules or atoms,...
packing density
1. In a photonic interconnect, the number of detectors in a given area. Detectors spaced too closely may give rise to...
storage area network
A high-speed network or subnetwork that provides a connection between servers and data storage devices.
integrated circuit
Multiple, interconnected circuit elements, contained on or in a common substrate, that function as a unit and not separately.
local area network
Data communications network in a clearly defined geographical location, and extending no more than a few miles in length. It...
link
In data communications, the instrumentation connecting two stations: transmitters, receivers and the cable that runs between...
envelope delay distortion
Distortion caused by variations in the rate of change of phase shift with frequency over the signal's necessary bandwidth.
FC connector
The fiber optic connector standard for Nippon Telephone & Telegraph (NTT) installations, developed with Nippon Electric...
Manufacturing Automation Protocol
A computerized token-passing local area network (LAN) configuration adopted by General Motors for real time control over the...
digital camera
A digital camera is a device that captures and records still images or video in digital format. Unlike traditional film...
zip-cord
A two-fiber optical cable containing two single-fiber cables that are connected by a strip of jacket and that can easily be...
biconic connector
A type of fiber optic connector consisting of two cone-shaped ferrules aligned by a mating sleeve.
digital twin
A digital twin refers to a virtual representation or digital counterpart of a physical object, system, or process. This...
smart pixel array
An array of active optical devices (modulators, laser diodes and/or detectors), each of whose electrical inputs or outputs...
fiber-coupled LED
A fiber-coupled LED (light-emitting diode) refers to an LED device that is optically coupled to an optical fiber for the...
optical time-domain reflectometer
An optical time-domain reflectometer (OTDR) is a specialized instrument used in optical fiber communications to characterize...
digital video compression
A step-by-step method of reducing the amount of data in a digital video signal to transmit or store a high-quality image....
television aperture
The term that represents the size of one of the many small elements into which a television image is necessarily broken down...
colorimeter
A colorimeter is a device used to measure and quantify the color characteristics of an object or a light source. It provides...
Digital Imaging and Communications in Medicine
Digital Imaging and Communications in Medicine (DICOM) is an international standard for medical imaging created by both the...
line of sight
The line of vision; the optical axis of a telescope or other observation system. The straight line connecting the object and...
Fresnel diffraction
1. Also known as near-field diffraction. The field of radiation sent through an aperture in an absorbing screen at large...
fiber optic cable assembly
A fiber optic cable assembly refers to a complete unit consisting of optical fibers, connectors, protective jackets, and...
extreme ultraviolet
Extreme ultraviolet (EUV) refers to a specific range of electromagnetic radiation in the ultraviolet part of the spectrum....
convolutional neural network
A powerful and flexible machine-learning approach that can be used in machine vision to help solve difficult problems....
scalar diffraction theory
Scalar diffraction theory is a simplified approach used to describe the propagation of electromagnetic waves, particularly...
multi-axis alignment
Multi-axis alignment refers to the process of aligning or adjusting components or systems in multiple spatial dimensions or...
chemical laser
A laser that relies on chemical activity instead of electrical energy to produce the pumping action necessary to form pulses...
ballast resistance
In a laser, the series resistance necessary for a stable electrical discharge.
starting voltage
In a laser, the voltage necessary to initiate electrical discharge, somewhat higher than that needed to sustain it.
filter factor
The necessary increase of a photograph's exposure time as the result of the additional absorption of light by the filter...
endoscope
An endoscope is a medical device used for visualizing and examining the interior of hollow organs, body cavities, or...
optical interconnection
The use of photonic devices rather than electronic devices to make connections within and between integrated circuits.
fiber optic transceiver
A fiber optic transceiver, often simply referred to as an "optical transceiver," is a device used in fiber optic...
light-activated silicon-controlled rectifier
A PN-PN device with incident light taking the place of gate current; three of the four semiconductor regions are available...
principal axis
A straight line connecting the curvature centers of the refracting lens surfaces. In a mechanical sense, a line joining the...
extrinsic fiber loss
A type of optical fiber loss resulting from the misalignment of fibers in a splice or connector.
bayonet coupling
A coupling mechanism designed to quickly lock a connector into an adaptor or a lens into a lens mount. Typically coupling is...
ultraviolet fiber optics
Ultraviolet (UV) fiber optics refers to optical fibers that are designed and optimized for the transmission of ultraviolet...
power supply
Refers to the voltage and current necessary for the operation of circuit devices.
optical link
Any optical transmission channel used in telecommunications designed to connect two end terminals or to be connected in...
noise
The unwanted and unpredictable fluctuations that distort a received signal and hence tend to obscure the desired message....
metropolitan area network
A cable backbone used to interconnect local area networks at various sites (corporate offices and factories, for example) in...
die bonding
Die bonding is a critical process in semiconductor manufacturing and microelectronics assembly, where a semiconductor die or...
contention rate
The maximum number of users who are using a given communication channel. Typically, the number of users at any given time is...
deflection yoke
A metal coil or coils wrapped around the outside of the neck of a cathode-ray tube. Current passing through the coils...
resonance
Resonance can be defined in various contexts, including physics, chemistry, and music. Here are definitions for resonance in...
wavefront
In considering a field of electromagnetic energy emanating from a source, the wavefront is a surface connecting all field...
luminaire
A complete unit containing a light source, globe, reflector, housing, socket and other necessary components for lighting.
connector
Hardware installed on fiber cable ends to provide cable attachment to a transmitter, receiver or other cable. Usually a...
fiber optic connector
whole slide imaging
Whole slide imaging (WSI), also known as virtual slide microscopy or digital pathology, is a technology that involves the...
neuromorphic
Neuromorphic refers to the design and development of computing systems or devices that are inspired by the structure and...
breakout cable
A breakout cable, also known as a fan-out cable or breakout assembly, is a type of cable that combines multiple individual...
rhomboid prism
A reflecting prism that is rhomboidal in shape. It has two parallel transmitting faces, and two parallel reflecting faces;...
multifiber joint
A fiber optic connector or splice that mates two multifiber cables, optically aligning all of the individual fibers...
rim ray
A ray of an image-forming bundle that passes through the edge of the entrance pupil or aperture stop. Usually used in...
fiber-lens fusing
A method of terminating optical fibers by forming a lens directly on the end of the fiber, eliminating the need for precise...
laser active elements
Laser active elements typically refers to the substances or materials within a laser system that play a critical role in the...
integrated optics
A thin-film device containing miniature optical components connected via optical waveguides on a transparent dielectric...
functional near-infrared spectroscopy
Functional near-infrared spectroscopy (fNIRS) is a non-invasive neuroimaging technique that measures changes in hemoglobin...
microfilm equipment
Two essential pieces of equipment used in connection with the microfilming process: a camera capable of producing, on film,...
dual inline package
A package for electronic components that is suited for automated assembly into printed circuit boards. The DIP is...
optical cable assembly
An optical cable that is connector terminated. Generally, an optical cable that has been terminated by a manufacturer and is...
Peltier cooler
A Peltier cooler, also known as a thermoelectric cooler (TEC) or thermoelectric module, is a solid-state device that uses...
histology
Histology is the branch of biology and medicine that involves the study of the microscopic structure of tissues and organs...
polishing puck
A flat cylindrical device generally used to polish terminated ends in fiber optic connections.
microdisplay
A microdisplay is a miniature electronic display technology that is designed to project visual information onto a small...
aspheric
Not spherical; an optical element having one or more surfaces that are not spherical. The spherical surface of a lens may be...
mirror mount
A mirror mount is a mechanical device used to secure and precisely position mirrors in optical systems. Mirrors are...
topology
Topology is a branch of mathematics that focuses on the properties of space that are preserved under continuous...
coupler
1. In color development, the chemical that combines with certain by-products of the development procedure to form a dye. 2....
infrared camera
An infrared camera, also known as a thermal imaging camera or IR camera, is a device that captures and visualizes the...
SMA connector
The fiber optic connector developed and manufactured by Amphenol Fiber Optic Products.
deep learning
Deep learning is a subset of machine learning that involves the use of artificial neural networks to model and solve complex...
fiber laser
A fiber laser is a type of laser in which the active gain medium is an optical fiber doped with rare-earth ions such as...
liquid crystal light valve
A liquid crystal light valve (LCLV), also known as a spatial light modulator (SLM), is an optical device that modulates the...
extraordinary ray
A ray that has a nonisotropic speed in a doubly refracting crystal. It does not necessarily obey Snell's law upon refraction...
sustaining voltage
In a laser, the voltage necessary to sustain a constant operating current, somewhat less than that needed for start-up.
inertial confinement fusion
Inertial confinement fusion (ICF) is a method of achieving nuclear fusion, a process where two atomic nuclei combine to...
electro-optic modulator
An electro-optic modulator (EOM) is a device used to modulate the amplitude, phase, or polarization of light waves using an...
tristimulus values
The values of the three standard or matching stimuli necessary to provide a match with the light under trial, in a specified...
image transformation
The processing of an image or portion of an image by transform coding and analysis. Fourier, Hadamand, Kronecker and...
profilometry
Measurement of surface roughness or quality through the use of a diamond-pointed stylus connected to a coil in an electric...
network interface card
A network interface card (NIC), also known as a network adapter or LAN adapter, is a hardware component that allows...
mirror blank
A mirror blank refers to the initial piece of material from which a mirror is made. It is typically a flat or slightly...
bilinear interpolation
It is often necessary to estimate the value of what a pixel would be between neighboring pixels. This is accomplished by...
fusion ignition
Fusion ignition refers to the point in a controlled nuclear fusion reaction where the energy released by the fusion...
micro-ring resonator
A micro-ring resonator is a compact optical device that utilizes the resonant behavior of light within a small ring-shaped...
dual attachment station
In a dual-ring local area network, a node that is connected both to the primary, active ring and also to a secondary ring...
annealing furnace
An oven or furnace that possesses the design requirements and heat control necessary to anneal glass for the optical...
hybrid mosaic on stacked silicon
A sensor module used in advanced pattern recognition systems, containing signal-processing integrated circuits stacked and...
lattice energy
With respect to the crystal, the decrease in energy that follows the process whereby the ions, separated from each other by...
optical fiber optic switches
Optical fiber optic switches are devices used in optical fiber communication systems to selectively route optical signals...
zeta particle
The difference in electrokinetic potential between the stationary liquid connected to a solid phase surface and the mobile...
single attachment station
In a dual-ring local area network, a node that is connected only to the primary, active ring and not to the secondary ring...
indium gallium arsenide camera
An InGaAs (indium gallium arsenide) camera is a type of imaging device that utilizes InGaAs sensors to capture images in the...
hematoporphyrin derivative
A material used in photodynamic therapy that is retained selectively by tumor tissue when injected into the body; it then...
crimp sleeve
A crimped metal cylinder that holds the connector to the cable through the cable's strength member.
laser surgery
Laser surgery refers to a medical procedure in which a laser, or focused beam of light, is used as a precision tool to cut,...
deep-depletion CCD
A CCD device for sensing longer wavelengths, such as NIR and IR, that has a deeper depletion region than would be necessary...
pulse forming network
A series of capacitors and inductors connected to the flashlamp in a pumped Nd:YAG laser system in order to regulate the...
3D laser line profile sensor
A 3D profile sensor, also known as a 3D profiling sensor or 3D depth sensor, is a technology that is used to capture and...
connector loss
Energy loss encountered at connectors in optical fiber transmission systems. The major contributors are mutual core...
wafer
In the context of electronics and semiconductor manufacturing, a wafer refers to a thin, flat disk or substrate made of a...
umbilical
A connection, typically made up of one or more cables, between a laser head and a separate power supply. Flexible pipes or...
photovoltaic cell
A photovoltaic cell, commonly known as a solar cell, is a semiconductor device that directly converts light energy into...

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