Glossary
Term | Main definition |
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Index matching gel |
A clear gel or fluid used between optical fibers that are
likely to have their ends separated by a small amount
of air space. The gel matches the refractive index of the
optical fiber, reducing light loss due to Fresnel reflection.
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Index matching material |
A material in liquid, paste, gel, or film form whose
refractive index is nearly equal to the core index; it is
used to reduce Fresnel reflections from a fiber end-face.
Liquid forms of this are also called index matching gel.
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Index of refraction |
(1) The ratio of the speed of light in a vacuum to the
speed of light in a given transmission medium. This is
usually abbreviated n. (2) The value given to a medium
to indicate the velocity of light passing through it relative
to the speed of light in a vacuum.
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Index profile |
The curve of the refractive index over the cross section of
an optical waveguide.
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Infiniband |
A standard for a switched fabric communications link
primarily used in high-performance computing.
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Infrared |
The infrared spectrum consists of wavelengths that
are longer than 700nm but shorter than 1mm. Humans
cannot see infrared radiation, but we feel it as heat. The
commonly used wavelengths for transmission through
optical fibers are in the infrared at wavelengths between
1100nm and 1600nm.
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Infrared laser |
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Infrared transceiver |
A transmitting and receiving device that emits and
receives infrared energy.
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Infrared transmission |
Transmission using infrared transceivers or lasers.
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Injection laser diode (ILD) |
A laser diode in which the lasing takes place within the
actual semiconductor junction and the light is emitted
from the edge of the diode.
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Innerduct |
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Insertion loss |
Light or signal energy that is lost as the signal passes
through the optical fiber end in the connector and is
inserted into another connector or piece of hardware.
A good connector minimizes insertion loss to allow the
greatest amount of light energy through. A critical measurement
for optical fiber connections. Insertion loss is
measured by determining the output of a system before
and after the device is inserted into the system. Loss in
an optical fiber can be due to absorption, dispersion,
scattering, microbending, diffusion, and the methods
of coupling the fiber to the power. Usually measured in
dB per item; for example, a coupler, connector, splice, or
fiber. Most commonly used to describe the power lost at
the entrance to a waveguide (an optical fiber is a waveguide)
due to axial misalignment, lateral displacement,
or reflection that is most applicable to connectors.
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Insertion Tool | Insertion Tool - A small device (Metal or Plastic) used to insert contact/s into a connector insulator. Tip: This tool often comes as a combination tool; Insertion/ Extraction tool (see Extraction Tool).
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Inside plant (IP) |
(1) Cables that are the portion of the cable network that is
inside buildings, where cable lengths are usually shorter
than 100 meters. This is the opposite of outside-the-plant
(OP or OSP) cables. (2) A telecommunications infrastructure
designed for installation within a structure.
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Installation load |
The short term tensile load that may be placed on a fiberoptic
cable.
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