Wired Broadband and Related Industry Glossary of Terms with Acronyms As of 13 June 2011 Compiled By: Conrad L. Young, Director, Broadband Technical Strategy



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Extinction Ratio (%)




F:

F-59, F-6 (F-56), F-7, F-11

A male connector that seizes the outer braid and jacket of an RG-59, RG-6 (RG-56), RG-7 or RG-11 drop cable. The center conductor of the cable extends through this connector, becoming the center contact. [Arr11]
F-61

Equipment or panel mounted connector with solder lug, threaded 3/8-32. [Arr11]
F-71

A double-ended "F" connector, used when sufficient cable is not available for installation. Male/male splice. [Arr11]
F-81

This connector is used to join together two cables. Female/female splice. Also used in wallplate applications. [Arr11]
Fabry Perot

Generally refers to any device, such as a type of laser diode that uses mirrors in an internal cavity to produce multiple reflections. [Fib111]

Fabry–Pérot Interferometer

A Fabry–Pérot interferometer consists of two parallel mirrors, allowing for multiple round trips of light. (A monolithic version of this can be a glass plate with reflective coatings on both sides.) For high mirror reflectivities, such a device can have very sharp resonances (a high finesse), i.e. exhibit a high transmission only for optical frequencies which closely match certain values. Based on these sharp features, distances (or changes of distances) can be measured with a resolution far better than the wavelength. Similarly, resonance frequencies can be defined very precisely. A modified version is the Fizeau interferometer, where the second mirror is totally reflective, and slightly tilted. The reflected light is used (e.g. with an angled beam splitter) e.g. for characterizing optical components. Another special kind of Fabry–Pérot interferometer, used for dispersion compensation, is the Gires–Tournois interferometer. [Enc11]



Fabry–Pérot interferometer

Fabry-Perot (FP) Laser

A laser oscillator in which two mirrors are separated by an amplifying medium with an inverted population, making a Fabry-Perot cavity. Standard Diode lasers are Fabry-Perot lasers. A Fabry-Perot Cavity is the standard cavity with two highly reflecting mirrors bouncing the Light back and forth, forming a standing wave. This cavity is not very Frequency selective; theoretically you could have 1 mm Wavelength light and .001 Micron wavelength light in the same cavity, as long as the mirrors are the right distance apart to form a standing wave. Fabry-Perot lasers are made with a Gain region and a pair of mirrors on the facets, but the only wavelength selectivity is from the Wavelength Dependence of the gain and the requirement for an integral number of wavelengths in a cavity round trip. A Fabry-Perot by definition consists of two planar mirrors, but the term is nowadays very frequently also used for resonators with curved mirrors. From a theoretical viewpoint, plane-plane Optical Resonators are special in the sense that their Resonator Modes extend up to the edges of the mirrors and experience some Diffraction losses. However, Fabry-Perots are usually used with input beams of much smaller diameter, which are actually not really matched to the resonator modes. For the usually small mirror spacings, where diffraction within a round trip is rather weak, this deviation does not matter that much. [Tim11]

FP Lasers in TO-can & FP Laser Based TOSA, courtesy of Archcom, http://www.archcomtech.com/products_2.asp



Facsimile
The electronic transmission of pictures, charts, graphs, etc., from one place to another by radio, telegraphy or telephone. With special facsimile equipment, a home television receiver may be able to deliver mail and newspapers by cable.


Factory Alignment
Refers to the bench test alignment conditions with the slope and gain controls (where applicable) are turned to maximum and no pad or equalizer is installed. These specs can be used to verify operation during a bench test.


Fading
The reduction in signal intensity of one or several of the components of a radio signal, typically caused by the reflective or refractive effects of multi-path.

Fahrenheit



Measure of temperature where pure water freezes at 32° and boils at 212°. [Fib111]
Failure Rate

See FIT Rate.

Fall Time

Also called turn-off time. The time required for the trailing edge of a pulse to fall from 90% to 10% of its amplitude; the time required for a component to produce such a result. Typically measured between the 90% and 10% points or alternately the 80% and 20% points. [Fib111]

Pulse Waveform courtesy of Fiber Optics Info, http://www.fiber-optics.info/fiber_optic_glossary/f


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