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See searches and references containing OPTICAL ATTENUATOR!OPTICAL ATTENUATOR
Device used to reduce the power level of an optical signal
optical attenuator, or fiber optic attenuator, is a device used to reduce the power level of an optical signal, either in free space or in an optical
Optical_attenuator
Gradual loss of flux intensity through a medium
and signals in electrical circuits, in optical fibers, and in air. Electrical attenuators and optical attenuators are commonly manufactured components in
Attenuation
Topics referred to by the same term
Attenuator could mean: Attenuator (electronics), an electronic device that reduces the amplitude of an electronic signal. Optical attenuator, an electronic
Attenuator
Type of electronic component
gain, an attenuator provides loss, or gain less than unity. An attenuator is often referred to as a "pad" in audio electronics. Attenuators are usually
Attenuator_(electronics)
Device used to join fiber optic strands in communication systems
– a more permanent, but still mechanical connection Optical attenuator – fiber optic attenuator Pedestal terminal closures are intended to house passive
Optical_fiber_connector
Gigabit passive optical network system
Attenuation classes in GPON define the allowable optical loss budget between the OLT and the ONU, ensuring reliable operation over a passive optical distribution
GPON
Light-conducting fiber
An optical fiber, or optical fibre, is a flexible glass or plastic fiber that can transmit light from one end to the other. Such fibers are widely used
Optical_fiber
Device used to measure power in an optical signal
the valence band and the conduction band and vice-versa is stable. Optical attenuator Ribbon Fiber Tone Tester OPM Application Notes greenTEG Application
Optical_power_meter
Optical fiber designed to carry only a single mode of light, the transverse mode
fiber-optic communication, a single-mode optical fiber, also known as fundamental- or mono-mode, is an optical fiber designed to carry only a single mode
Single-mode_optical_fiber
Physics concept
In physics, optical depth or optical thickness is the natural logarithm of the ratio of incident to transmitted radiant power through a material. Thus
Optical_depth
throughput. Optical fiber cable Color coding of connector boot and fiber cable jackets Optical attenuator Fiber optic attenuator Optical fiber connector
Gap_loss
Cable assembly containing one or more optical fibers that are used to carry light
cable, also known as an optical-fiber cable, is an assembly similar to an electrical cable but containing one or more optical fibers that are used to
Fiber-optic_cable
Scientific law describing absorption of light
Beer's relates the optical attenuation of a physical material containing a single attenuating species of uniform concentration to the optical path length through
Beer–Lambert_law
Arrangement of mirrors
An optical cavity, resonating cavity or optical resonator is an arrangement of mirrors or other optical elements that confines light waves similarly to
Optical_cavity
Topics referred to by the same term
Vasa Order of America, a Swedish-American fraternal society Variable Optical Attenuator, a device to reduce the intensity of light. Verb–object–agent, a theoretical
VOA_(disambiguation)
Technology used to provide broadband to the end consumer via fiber
A passive optical network (PON) is a fiber-optic telecommunications network that uses only unpowered devices to carry signals, as opposed to electronic
Passive_optical_network
American glass and ceramics manufacturer
Peter C. Schultz, and Frank Zimar had demonstrated an optical fiber with a low optical attenuation of 17 dB per kilometer by doping silica glass with titanium
Corning_Inc.
Topics referred to by the same term
or other electrical network line Optical attenuator, an electronic device that reduces the amplitude of an optical signal, as used on a fiberoptic network
Network_filter
Means of communication using light
Optical networking is a means of communication that uses signals encoded in light to transmit information in various types of telecommunications networks
Optical_networking
Physical property of allowing light
are other factors resulting in attenuation. At high optical powers, scattering can also be caused by nonlinear optical processes in the fiber. Many marine
Transparency_and_translucency
Communication using light sent through free space
Free-space optical communication (FSO) is an optical communication technology that uses light propagating in free space to wirelessly transmit data for
Free-space optical communication
Free-space_optical_communication
Logarithm of ratio of incident to transmitted radiant power through a sample
\varepsilon } is the molar attenuation coefficient or absorptivity of the attenuating species; ℓ {\displaystyle \ell } is the optical path length; and c {\displaystyle
Absorbance
Device used to extend the reach of optical communications links
of optical communications links by overcoming loss due to attenuation of the optical fiber. Some repeaters also correct for distortion of the optical signal
Optical communications repeater
Optical_communications_repeater
Induced Attenuation (RIA), or Radiation-induced darkening. The loss of power or 'darkening' occurs because the chemical bonds forming the optical fiber
Radiation effects on optical fibers
Radiation_effects_on_optical_fibers
Standardized optical fiber digital audio interconnect
Link) is a standardized optical fiber connector system. Generically known as optical audio, the most common use of the TOSLINK optical fiber connector is in
TOSLINK
Use of light to convey information
Optical communication, also known as optical telecommunication, is communication at a distance using light to carry information. It can be performed visually
Optical_communication
Branch of physics
Nonlinear optics (NLO) is a branch of optics that studies the case when optical properties of matter depend on the intensity of the input light. Nonlinear
Nonlinear_optics
Optical fiber that is made out of polymer
Plastic optical fiber (POF) or polymer optical fiber is an optical fiber that is made out of polymer. Similar to glass optical fiber, POF transmits light
Plastic_optical_fiber
Range of wavelengths from 650 to 1350 nanometre
The near-infrared (NIR) window (also known as optical window or therapeutic window) defines the range of wavelengths from 650 to 1350 nanometre (nm) where
Near-infrared window in biological tissue
Near-infrared_window_in_biological_tissue
Filters which selectively transmit specific colors
However, the optical term absorbance refers to the attenuation of the incident light, regardless of the mechanism by which it is attenuated. Some filters
Optical_filter
Type of fibre-optic cable
Optical attached cable (OPAC) is a type of fibre-optic cable that is installed by being attached to a host conductor along overhead power lines. The attachment
Optical_attached_cable
Transmitting information over optical fiber
of optical communication for transmitting information from one place to another by sending pulses of infrared or visible light through an optical fiber
Fiber-optic_communication
Instrument for measuring particle concentration
intervals. The increase in attenuation from one measurement to the next is proportional to the increase in the density of optically absorbing material on the
Aethalometer
Portion of the electromagnetic spectrum that is visible to the human eye
this range of wavelengths is called visible light (or simply light). The optical spectrum is sometimes considered to be the same as the visible spectrum
Visible_spectrum
Accounting of signal gains and losses in communications
waveguides, or optical fibers, to the receiver. It is an equation giving the received power from the transmitter power, after the attenuation of the transmitted
Link_budget
Lithography using 13.5 nm UV light
Optical Lithography Chris A. Mack, p. 37. C. A. Mack, Microlith. World, 9–4, 25 (2000) J. S. Petersen et al., Proc. SPIE 3546, 288 (1998). "Optical and
EUV_lithography
Effectiveness of a material in transmitting radiant energy
transmittance is related to optical depth and to absorbance as T = e − τ = 10 − A , {\displaystyle T=e^{-\tau }=10^{-A},} where τ is the optical depth; A is the absorbance
Transmittance
Optical microscope that uses fluorescence and phosphorescence
fluorescence microscope is an optical microscope that uses fluorescence instead of, or in addition to scattering, reflection, and attenuation or absorption, to study
Fluorescence_microscope
Single-mode optical fiber for linearly polarized light
In fiber optics, polarization-maintaining optical fiber (PMF or PM fiber) is a single-mode optical fiber in which linearly polarized light, if properly
Polarization-maintaining optical fiber
Polarization-maintaining_optical_fiber
Optoelectronic instrument
An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize an optical fiber. It is the optical equivalent of an
Optical time-domain reflectometer
Optical_time-domain_reflectometer
bottleneck List of device bandwidths Optical cable Optical communication Optical link Optoelectronics Parallel optical interface PCI Express Terabit Ethernet
Active_cable
Chinese optical corporation
detectors, fiber optical couplers/splitters, optical switches/attenuators, WDM/DWDM/CWDM/OADM modules, and optical amplifiers. It primarily serves telecommunications
Accelink_Technologies
Optical device for selecting part of a spectrum
A monochromator is an optical device that transmits a mechanically selectable narrow band of wavelengths of light or other radiation chosen from a wider
Monochromator
Resolution-improving photomask
through a transparent media will undergo a phase change as a function of its optical thickness. A conventional photomask is a transparent plate with the same
Phase-shift_mask
Infrared spectroscopy sampling technique
Attenuated total reflection (ATR) is a sampling technique used in conjunction with infrared spectroscopy which enables samples to be examined directly
Attenuated_total_reflectance
Study of light interaction with water and submerged materials
satellites. The vast majority of the world's oceans by area are optically deep. Optically deep water can still be relatively shallow water in terms of total
Ocean_optics
Characteristic of an optical system
The optical transfer function (OTF) of an optical system such as a camera, microscope, human eye, or projector is a scale-dependent description of their
Optical_transfer_function
Laser pulsing technique
achieved by putting some type of variable attenuator inside the laser's optical resonator. When the attenuator is functioning, light which leaves the gain
Q-switching
Optical diode invented by Jun-Ichi Nishizawa
forward current. Consequently, PIN diode can be used in some variable attenuator designs as amplitude modulators or output leveling circuits. PIN diodes
PIN_diode
Process in microfabrication
Photolithography (also known as optical lithography) is a process that involves using light to transfer a pattern onto a photoresist layer deposited on
Photolithography
the following applies: The higher the attenuation, the shorter the distance. For comparison, plastic optical fibers (POF) have low bandwidths and transmission
Hard-clad silica optical fiber
Hard-clad_silica_optical_fiber
Japanese component manufacturing company
development with Micralyne Inc. for optical sensor device incorporating MEMS.VOA（Variable Optical Attenuator）and optical switch with hermetically sealed in
Adamant_Co.,_Ltd.
Electrical isolation mechanism
ear lobe of the pilot. In the early 1950s, Teletronix used the "T4" optical attenuator in the LA-2 compressor, furthermore, for their unique sound, they
Resistive_opto-isolator
links that use optical amplifiers to compensate for attenuation over long distances. Other forms of optical links include free-space optical telecommunication
Optical_link
Optical technique for monitoring brain activity
spectroscopy (fNIRS), sometimes referred to as NIRS or Optical Topography (OT), is an optical brain monitoring technique which uses near-infrared spectroscopy
Functional near-infrared spectroscopy
Functional_near-infrared_spectroscopy
Electronic instrument
spread-spectrum time-domain reflectometry. The equivalent device for optical fiber is an optical time-domain reflectometer. Time-domain transmissometry (TDT)
Time-domain_reflectometer
Device in optics that reduces light intensity
transition area, or edge, is available in different variations (soft, hard, attenuator). The most common is a soft edge and provides a smooth transition from
Neutral-density_filter
Number used to evaluate the performance of an amplifier
} Attenuators have a noise factor F equal to their attenuation ratio L when their physical temperature equals T0. More generally, for an attenuator at
Noise_figure
Accumulation of material on solar energy collectors
also describes an optical soiling measurement approach, where the attenuation of light passing through a reference glass or optical sensor is monitored
Soiling_(solar_energy)
Medical intervention
Optical tomography is a form of computed tomography that creates a digital volumetric model of an object by reconstructing images made from light transmitted
Optical_tomography
Property in optics
ratio of the speed of light in vacuum (c) to the speed of light in a given optical medium (v), n=c/v. The refractive index determines how much the path of
Refractive_index
Brand of audio processing equipment
element of all the dynamics processing products is the voltage-controlled attenuator, the Aphex VCA 1001. Another key element is Aphex' input and output circuitry
Aphex_Systems
Photolithographic tool
used attenuated phase-shifting mask is more sensitive to the higher incidence angles applied in "hyper-NA" lithography, due to the longer optical path
Photomask
Physical process by which matter takes up a photon's energy and stores it
measures, including absorbance (also called "optical density") and optical depth (also called "optical thickness") All these quantities measure, at least
Absorption (electromagnetic radiation)
Absorption_(electromagnetic_radiation)
Filter that rejects signals inside a certain range
light according to the wavelengths that are minimally attenuated. To some extent, all real optical systems will suffer from this phenomenon. Alternatively
Band-stop_filter
Range of physical processes in physics
is important in areas such as particle physics, atomic, molecular, and optical physics, nuclear physics and astrophysics. In particle physics the quantum
Scattering
Optical imaging technique
Spectroscopic optical coherence tomography (SOCT) is an optical imaging and sensing technique, which provides localized spectroscopic information of a
Spectroscopic optical coherence tomography
Spectroscopic_optical_coherence_tomography
Concentrated solar power plant in Gansu, China
single-turbine" arrangement is described by SolarPACES as a way to avoid the optical attenuation losses that affect very large single-tower CSP plants, in which heliostats
Guazhou_Thermosolar_Plant
items as, optical power meters, optical light sources, optical loss test sets, optical test and inspection kits, variable optical attenuators, inspection
Kingfisher_International
Fiber-optic communications technology
(WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e., colors)
Wavelength-division multiplexing
Wavelength-division_multiplexing
destructive technique for determining certain optical fiber transmission characteristics, such as attenuation and bandwidth. The measurement technique consists
Cutback_technique
One or more layers of materials of lower refractive index
Cladding in optical fibers is one or more layers of materials of lower refractive index in intimate contact with a core material of higher refractive
Cladding_(fiber_optics)
Chemical compound
wavelength between about 1510 nm and 1600 nm has the lowest attenuation available on optical fibre (about 0.2 dB/km). Further, O-band and C-band wavelengths
Indium_phosphide
Measure of change in amplitude and phase of a wave
_{r}}} \over {\lambda }}{\tan \delta }} The attenuation constant for a particular propagation mode in an optical fibre is the real part of the axial propagation
Propagation_constant
Optical device which transmits and refracts light
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent
Lens
Optical waveguide
cutoff wavelength) and used as a precision attenuator is also known as a "waveguide below-cutoff attenuator." The zero-mode waveguide is made possible
Zero-mode_waveguide
Device that switches or amplifies optical signals
An optical transistor, also known as photonic transistor, optical switch or light valve, is a device that switches or amplifies optical signals. Light
Optical_transistor
Joint in electrical or optical cable
connecting lengths of electrical cables (electrical splice) or optical fibers (optical splice). The splices are often protected by sleeves. The splicing
Line_splice
Structure that guides waves efficiently
non-destructive evaluation. Specific examples: Optical fibers transmit light and signals for long distances with low attenuation and a wide usable range of wavelengths
Waveguide
Effect of a material on light
lines (such as microwaves in coaxial cable) or the pulses of light in optical fiber. In optics, one important and familiar consequence of dispersion
Dispersion_(optics)
Medical diagnostic method
Diffuse optical mammography, or simply optical mammography, is an emerging imaging technique that enables the investigation of the breast composition through
Diffuse_optical_mammography
Captures vibrations produced by musical instruments
filter, producing a non-linearity effect not found in piezoelectric or optical transducers. Pickups are usually designed to feed a high input impedance
Pickup_(music_technology)
Depth that light can penetrate into a material
positive number describes attenuation (reduction of the field) or gain; this is usually obvious from the context. The attenuation constant for an electromagnetic
Penetration_depth
Device that converts images into electronic signals
digital types, which include digital cameras, camera modules, camera phones, optical mouse devices, medical imaging equipment, night vision equipment such as
Image_sensor
Mathematical transformation reducing the damage caused by aliasing
In the case of optical image sampling, as by image sensors in digital cameras, the anti-aliasing filter is also known as an optical low-pass filter (OLPF)
Anti-aliasing_filter
Laser using an optical fiber as the active gain medium
Commonwealth English) is a laser in which the active gain medium is an optical fiber doped with rare-earth elements such as erbium, ytterbium, neodymium
Fiber_laser
Ability of an imaging system to resolve detail
Optical resolution is the resolved detail of an imaging system by scale. An imaging system may have many individual components, including one or more
Optical_resolution
This could be used for filter channels, optical attenuators, and optical color filters Free-space optical communications (FSO) can be used for high-bandwidth
Organic photorefractive materials
Organic_photorefractive_materials
Measurement device
variable attenuator and this combination is often used in optical systems. The variable attenuator made in this fashion is not recommended for attenuation for
Laser_beam_profiler
Complete reflection of a wave
plane of incidence. Optical fibers exploit total internal reflection to carry signals over long distances with little attenuation. They are used in telecommunication
Total_internal_reflection
Quantum states light can be in
method uses degenerate type I optical-parametric down-conversion (also called optical-parametric amplification) inside an optical resonator. To squeeze modulation
Squeezed_states_of_light
Topics referred to by the same term
substance absorbs light at a given wavelength, per molar concentration Optical extinction coefficient, the imaginary part of the complex index of refraction
Extinction_coefficient
Material which alters light reflection or transmission on optics
An optical coating is one or more thin layers of material deposited on an optical component such as a lens, prism or mirror, which alters the way in which
Optical_coating
Optical microscopy illumination technique
Bright-field microscopy (BF) is the simplest of all the optical microscopy illumination techniques. Sample illumination is transmitted (i.e., illuminated
Bright-field_microscopy
When a transmitted signal reflects back through the medium it was transmitted over
an optical fiber. Imperfections in the glass create mirrors that reflect the light back along the fiber. Impedance discontinuities cause attenuation, attenuation
Signal_reflection
Switch between light-conducting fiber circuits
An optical cross-connect (OXC) is a device used by telecommunications carriers to switch high-speed optical signals in a fiber optic network, such as an
Optical_cross-connect
Type of coaxial cable
resulting product more heat resistant. Cables attenuate a signal in direct proportion to length. Attenuation increases with frequency due to skin effect
RG-6
Type of sensor
fiber. The optical pulse is attenuated as it propagates along the fiber. For a single mode fiber operating at 1550 nm, a typical attenuation is 0.2 dB/km
Distributed_acoustic_sensing
Device that narrows or straightens a beam of particles or waves
nonimaging optics. Optical collimators can be used to calibrate other optical devices, to check if all elements are aligned on the optical axis, to set elements
Collimator
Linked hypertext system on the Internet
even private residences. The technology uses optical microsystems like tunable lasers, filters, attenuators, switches, and wavelength-selective switches
World_Wide_Web
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