Fiber Optic Reference Guide: A Practical Guide to Communications Technology, Third Edition

I

IC

See Integrated Circuit (IC).

IDP

See Integrated Detector/Preamplifier (IDP).

IEEE
Abbreviation for Institute of Electrical and Electronic Engineers.
IETF
Abbreviation for Internet engineering task force.
IIN

See Interferometric Intensity Noise (IIN).

IM

See Intensity Modulation (IM).

Index-matching Fluid
A fluid whose index of refraction nearly equals that of the fiber's core. Used to reduce Fresnel reflection at fiber ends.

See also Index-matching Gel.

Index-matching Gel
A gel whose index of refraction nearly equals that of the fiber's core. Used to reduce Fresnel reflection at fiber ends.

See also Index-matching Fluid.

Index of Refraction
Also refractive index. The ratio of the velocity of light in free space to the velocity of light in a fiber material. Symbolized by n. Always greater than or equal to one.
Infrared (IR)
The region of the electromagnetic spectrum bounded by the long-wavelength extreme of the visible spectrum (about 0.7 ?m) and the shortest microwaves (about 0.1 mm). See also frequency

See also Light.

Infrared Fiber
Colloquially, optical fibers with best transmission at wavelengths of 2 ?m or longer, made of materials other than silica glass.

See also Fluoride Glasses.

InGaAs
Indium gallium arsenide. A semiconductor material used to make high-performance long-wavelength detectors.
InGaAsP
Indium gallium arsenide phosphide. A semiconductor material used to make long-wavelength light emitters.
Injection Laser Diode (ILD)
A laser employing a forward-biased semiconductor junction as the active medium. Stimulated emission of coherent light occurs at a pn junction where electrons and holes are driven into the junction.

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