Glossary

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1000Base LX
The name for Gigabit Ethernet that is transmitted over fiber using long wave transmitters.
1000Base SX
The name for Gigabit Ethernet that is transmitted over fiber using short wave laser transmitters.
1000Base T
The name for Gigabit Ethernet transmitted over a twisted pair.
100Base FX
A 100 Mbps Ethernet system based on 4B/5B signal encoding that is transmitted over fiber optic cable.
100Base T
A term used for the entire 100 Mbps Fast Ethernet system, including both twisted-pair and fiber optic media types....
10Base F
A 10 Mbps Ethernet system based on Manchester signal encoding transmitted over fiber optic cable.
10Base T
A 10 Mbps Ethernet system based on Manchester signal encoding transmitted over Category 3 or higher twisted-pair cable.
10Base2
A 10 Mbps Ethernet system based on Manchester signal encoding transmitted over thin coaxial cable; also known as thinwire...
10Base5
A 10 Mbps Ethernet system based on Manchester signal encoding transmitted over thick coaxial cable; also known as thicknet....
10Gig Fiber Optic Patch Cord
A laser optimized fiber that supports 10 Gigabit per second transmission for distances of 300 meters or more and...
802.1
An IEEE working group for high-level interfaces, network management, inter-networking and other issues common across LAN technologies.
802.3
An IEEE working group for carrier-sense multiple access/carrier detect Local Area Networks.
802.3 Network
A 10 Mb/s CSMA/CD bus-based network; is commonly referred to as Ethernet.
802.5 Network
A token-passing ring network that operates at 4 Mb/s or 16 Mb/s.
8B10B Encoding
A signal modulation scheme in which eight bits are encoded in a 10-bit word to ensure that too many...
Abaxial Spherical Aberration
This type of aberration occurs when a patch of light is formed on points outside of the lens axis....
Abbe Condenser
This condenser consists of two lenses that collect and direct light onto a predetermined object. It can achieve high...
Abbe Constant
The ratio of an optical medium's refractivity to its dispersion. It is the reciprocal of dispersive power.
Abbe Illumination
A form of illumination where the source is imaged directly onto the object being viewed or projected. This requires...
Abbe Prism
A type of roof prism with perpendicular end faces that can invert an image when inserted between the object...
Abbe Refractometer
An optical instrument used to measure the of index of refraction of an unknown sample of optical glass. Designed...
Abbe Sine Condition
A condition that must be met by any spherically corrected lens if it is to be free from coma...
Abbe-Porro Prism
A compact version of the traditional Porro prism used in binoculars.
ABCD Matrix
Also known as a ray transfer matrix, this is a 2-by-2 matrix describing the effect of an optical element...
Aberration
A deviation from what is normal or expected. In optics, this could be a defect in a lens system...
Aberration Sensor
An optical instrument that can detect and measure aberrations via a knife-edge technique.
Ablation Threshold
An energy input level at which absorbed laser energy can break the bonds between molecules.
Ablative Photodecomposition
The process of pulsed ultraviolet radiation being absorbed by a material, leading to excitation within and between molecules. This...
Ablative Wall Flashlamp
A bright, short-lived source that occurs when low-pressure gas vaporizes material from the tube wall and leads to a...
Abney Effect
The hue shift that results when purity and saturation are varied.
Abrasion Mark
A mark on an optical surface produced by surfaces sliding against each other.
Abridged Spectrophotometer
An instrument that uses bandpass filters to measure transmission and reflection as a function of wavelength.
Absolute Refractive Index
The ratio of the speed of light in a vacuum to the speed of light in the medium.
Absorb
The mechanism by which materials transform incident energy into internal energy (typically heat).
Absorbance
A measure of a medium's ability to absorb radiation, often expressed as the reciprocal logarithm of transmittance.
Absorbing Wedge
A strip of glass with transmission that varies linearly with distance, due to varying absorption.
Absorptance
Ratio of the absorbed radiant flux to the incident flux.
Absorption
The portion of energy (light) that is attenuated during propagation via energy exchange in the material.
Absorption Band
A region of the spectrum in which the absorption coefficient reaches a maximum. Also a range of electromagnetic radiation...
Absorption Coefficient
The measure of how far a wavelength's light can travel before being absorbed. Also the measure of a gas's...
Absorption Hologram
A hologram that results from the light of an illuminating beam being absorbed in correspondence with recording exposure.
Absorption Index
The measure of attenuation caused by absorbed energy per unit of distance in an electromagnetic wave.
Absorption Lens
A lens that inhibits certain wavelengths from passing through it by absorbing them.
Absorption Line
The most narrow range of radiant energy wavelengths that can be absorbed.
Absorption Meter
An instrument that uses a light-sensitive detector to measure how much light is transmitted by a material.
Absorption Peak
In the field of spectroscopy, the maximum wavelength of radiation that can be absorbed by a sample.
Absorption Spectrophotometer
An optical instrument that measures the absorption spectra of different specimens.
Absorption Spectroscopy
The study of energy and wavelengths of radiation that atoms and molecules absorb under varying physical conditions.
Absorption Spectrum
Also referred to as the spectral window of absorption, this spectrum is formed by radiation that has been filtered...
Accelerated Aging
The operation of a sample population of the lasers for an extended period of time under harsher conditions then...