Fiber Optic Glossary

V Number
The normalized frequency parameter or V-number gives the upper limit of the number of modes that can be transmitted in...
Vacuum Noise
Vacuum noise is quantum noise related to the zero-point fluctuations of the electric field in the vacuum state. Such fluctuations...
Vanadate Lasers
The term vanadate laser is usually used for lasers based on neodymium-doped vanadate crystals. In particular, these include yttrium vanadate...
VCSEL
Vertical cavity surface emitting laser, a type of laser that emits light vertically out of the chip, not out the...
VDSL
Abbreviation for very high data rate digital subscriber line. A DSL operating at a data rate higher than that of...
VECSEL
Vertical extended cavity surface-emitting laser; A laser that has a surface-emitting semiconductor gain element couple to an external mirror designed...
Velocity Matched Photodetectors
A type of photodetectors, where propagation velocities of light and electrical signals are matched in order to achieve a very...
Velocity of light
The velocity of light is 300,000 Km/sec in a vacuum. In a medium it depends in the refractive index and the...
Vertex Angle
In an optical fiber, the angle formed by the extreme bound meridional rays accepted by the fiber, or emerging from...
Vibronic Lasers
Lasers based on gain media with a large gain bandwidth, caused by a strong interaction of electronic transitions with...
Virtual Circuit
A communications arrangement in which data from a source user may be passed to a destination user over various real...
Virtual Connections
Each Asynchronous Transfer Mode (ATM) cell contains a virtual connection identifier. Many virtual connections can be established over the same physical...
Visible Lasers
The term visible lasers is used to denote lasers emitting visible light, or sometimes laser devices generating visible light via...
Visible Light
Electromagnetic radiation visible to the human eye from wavelengths of 400 (blue) - 700 nm (red) The peak of the...
Visible Optical Damage
Visible optical damage is a damage, which occurs due to photo-induced break down of trace (as low as parts per...
Visual Fault Locator
A device that couples visible light into the fiber to allow visual tracing and testing of continuity. Some are bright...
VLSI
Very Large-Scale Integration. A manufacturing and design process that allows great quantities of electronic components to be put on a single...
VOA Variable Optical Attenuator
An abbreviation for variable optical attenuator.
Voice Circuit
A circuit capable of carrying one telephone conversation or its equivalent; the standard subunit in which telecommunication is counted. The...
Volition
The Volition is an inexpensive duplex connector that uses no ferrule at all.
VPN
Abbreviation for virtual private network. A protected information-system link utilizing tunneling, security controls, and end-point address translation giving the end...

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