EDFA


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Related to EDFA: Raman amplifier, Oadm

EDFA

[′ed‚fä or ¦ē¦dē¦ef′ā]
(communications)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

EDFA

(Erbium-Doped Fiber Amplifier) A device that boosts the signal in an optical fiber. Introduced in the late 1980s, the EDFA was the first successful optical amplifier. It was a major factor in the rapid development of fiber-optic networks in the 1990s, because it extended the distance between costly regenerators. In addition, an EDFA amplifies all the channels in a WDM signal simultaneously, whereas regenerators require optical to electrical conversion for each channel.

A Laser Without Mirrors
Functioning like a laser without mirrors, the EDFA uses a semiconductor pump laser to introduce a powerful beam at a shorter wavelength into a section of erbium-doped fiber several meters long. The pump light excites the erbium atoms to higher orbits, and the input signal stimulates them to release excess energy as photons in phase and at the same wavelength. EDFAs boost wavelengths in the 1550 nm range, and the pump light is typically 1480 nm or 980 nm. See EDWA, WDM, Raman amplifier and optical amplifier.


Erbium-Doped Fiber Amplifier
EDFAs boost the input regardless of the number of wavelengths. In several meters of doped fiber, the pump laser excites the doped atoms to higher orbits, and the input signal stimulates them to release excess energy as photons in phase and at the same wavelength. (Illustration courtesy of Jeff Hecht.)
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References in periodicals archive ?
Both FOPAs and LRAs are promising alternatives for replacement of conventional EDFAs, but at this point it is not clear which of these two approaches is the most promising taking into account the quality of the amplified signal.
Yucel, "Fuzzy logic-based automatic gain controller for EDFA", Microwave and Optical Technology Letters, vol.
A combination of several key factors made the EDFA amplifier choice number one for today's optical communication systems based on the WDM technology [14, 15].
Furthermore, increase in EDFA gain within -5~-30 dB can provide support for desired number of subscribers in the proposed architecture.
H, "Self-Calibrating Automated Characterization System for Depressed Cladding EDFA Applications Using Labview Software With GPIB", IEEE Transactions on Instrumentation and Measurement 2008; 57(11): 2677-2681.
This property is utilized in the development of both erbium-doped optical fiber amplifiers (EDFA) (2) and erbium-doped planar waveguide amplifiers (EDPWA) (3).
An ideal EDFA (power = 10 dBm) pre-amplifies the optical carrier before o/e conversion at the receiver section (at PIN-PD having thermal noise of 1e-22W/Hz)) with a center frequency of 193.4 THz is used for the analysis.
WDM and erbium-doped fiber amplifier (EDFA) technology are widely used in current optical fiber network and the noise they induce in the 1550 nm band is too high to allow single photon transmission in that band of the same fiber.
The South Dakota Economic Development Finance Authority ("EDFA") has authority to issue negotiable notes and bonds, subject to a maximum amount outstanding of three hundred million dollars at any one time.
According to the company, the PL-1000 has been designed to provide 10Gb/s connectivity over existing dark fibre infrastructure previously used for lower rate services, by providing integrated optical amplifier (EDFA), 3R functionality and Mux/DeMux.