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E/O


Abbreviation for electrical-to-optical converter. A device that converts electrical signals to optical signals, such as a laser diode.

E/O
 


ECL


Abbreviation for emitter-coupled logic. A high-speed logic family capable of GHz rates.

 


EDFA


See Erbium-doped fiber amplifier.

 


Edge-emitting Diode


An LED that emits light from its edge, producing more directional output than surface-emitting LED’s that emit from their top surface.

Edge-emitting Diode
 




Effective Area


The area of a single-mode fiber that carries the light.

Effective Area
 


EGA


Abbreviation for enhanced graphics adapter. A medium-resolution color standard for computer monitors.

 


EIA


Abbreviation for Electronic Industries Association. An organization that sets video and audio standards.

http://www.eia.org/

 


Electromagnetic Interference


Any electrical or electromagnetic interference that causes undesirable response, degradation, or failure in electronic equipment. Optical fibers neither emit nor receive EMI.

 


Electromagnetic Pulse


A burst of electromagnetic radiation that creates electric and magnetic fields that may couple with electrical/electronic systems to produce damaging current and voltage surges.

 


Electromagnetic Radiation


Radiation made up of oscillating electric and magnetic fields and propagated with the speed of light. Includes gamma radiation, X-rays, ultraviolet, visible, and infrared radiation, and radar and radio waves.

 


Electromagnetic Spectrum


The range of frequencies of electromagnetic radiation from zero to infinity.

 


ELED


See edge-emitting diode.

 


Ellipticity


Describes the fact that the core or cladding may be elliptical rather than circular.

Ellipticity
 


EM


Abbreviation for electromagnetic.

 


EMI


see Electromagnetic Interference

 


EMP


see Electromagnetic Pulse

 


EMR


see Electromagnetic Radiation

 


Endoscope


A fiber optic bundle used for imaging and viewing inside the human body.

 


Equilibrium Mode Distribution


The steady modal state of a multimode fiber in which the relative power distribution among modes is independent of fiber length.

Equilibrium Mode Distribution
 


Erbium-doped Fiber Amplifier


Optical fibers doped with the rare earth element, erbium, which can amplify light in the 1550 nm region when pumped by an external light source.

Erbium-doped Fiber Amplifier
 


Error Correction


In digital transmission systems, a scheme that adds overhead to the data to permit a certain level of errors to be detected and corrected.

 


Error Detection


Checking for errors in data transmission. A calculation based on the data being sent; the results of the calculation are sent along with the data. The receiver then performs the same calculation and compares its results with those sent. If the receiver detects an error, it can be corrected, or it can simply be reported.

 


ESCON


Abbreviation for enterprise systems connection. A duplex optical connector used for computer-to-computer data exchange.

ESCON
 


Ethernet


A standard protocol (IEEE 802.3) for a 10-Mb/s baseband local area network (LAN) bus using carrier sense multiple access with collision detection (CSMA/CD) as the access method. Ethernet is a standard for using various transmission media, such as coaxial cables, unshielded twisted pairs, and optical fibers.

Ethernet
 


Evanescent Wave


Light guided in the inner part of an optical fiber’s cladding rather than in the core, i.e. the portion of the light wave in the core that penetrates into the cladding.

Evanescent Wave
 




Excess Loss


In a fiber optic coupler, the optical loss from that portion of light that does not emerge from the nominal operation ports of the device.

 


External Modulation


Modulation of a light source by an external device that acts like an electronic shutter.

 


Extinction Ratio


The ratio of the low, or OFF optical power level (PL) to the high, or ON optical power level (PH):

Extinction Ratio (%) = (PL/PH) x 100

 


Eye Pattern


A diagram that shows the proper function of a digital system. The “openness” of the eye relates to the BER that can be achieved.

Eye Pattern