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Topic: Erbium doped fiber amplifier

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	What is erbium amplifier? - a definition from Whatis.com - see also: EDFA, optical amplifier, erbium-doped fiber ...
		The device uses a short length of optical fiber doped with the rare-earth element erbium.
		This so-called pumping excites the atoms in the erbium-doped section of optical fiber, increasing the intensity of the laser beams passing through.
		In fiber optic communications systems, problems arise from the fact that no fiber material is perfectly transparent.
	searchnetworking.techtarget.com /sDefinition/0,,sid7_gci214539,00.html (495 words)

	Optical fiber - Wikipedia, the free encyclopedia
		Fiber with a core diameter narrower than a few wavelengths of the light carried, is analyzed as an electromagnetic structure, by solution of Maxwell's equations, as reduced to the electromagnetic wave equation.
		An optical amplifier is typically made by doping a length of fiber with the rare-earth mineral erbium, and pumping it with light from a laser with a shorter wavelength than the communications signal (typically 980 nm).
		The fiber ends are aligned and held together by a precision-made sleeve, often using a clear gel (index matching gel) that enhances the transmission of light across the joint.
	en.wikipedia.org /wiki/Fiber_optics (4929 words)

	HighBeam Encyclopedia - amplifier
		AMPLIFIER [amplifier] device that accepts a varying input signal and produces an output signal that varies in the same way as the input but has a larger amplitude.
		In one type of single-transistor amplifier, known as a common-emitter circuit, a varying input voltage is fed to the base of the transistor, and the output appears at the transistor's collector; the ratio of the output voltage to the input voltage is called the voltage gain.
		In a cascade, or multistage, amplifier, the output of the first amplifying device (transistor) is fed as input to the second amplifying device, whose output is fed as input to the third, and so on until an adequate signal amplification has been achieved.
	www.encyclopedia.com /html/a/amplifie.asp (522 words)

	Encyclopedia of Laser Physics and Technology - fiber amplifiers, EDFA, YDFA, TDFA, amplifier modules, saturation, ASE
		Fiber amplifiers based on erbium-doped single-mode fibers (acronym: EDFAs) are widely used in long-range optical fiber communications systems for compensating the loss of long fiber spans.
		Fiber amplifiers for the second telecom window around 1.3 μm are also available, but have a lower performance compared with that of erbium-doped amplifiers.
		Fiber amplifiers based on ytterbium- or neodymium-doped double-clad fibers can be used to boost the output power of 1-μm laser sources to very high levels of up to several kilowatts (→ high power fiber lasers and amplifiers).
	www.rp-photonics.com /fiber_amplifiers.html (1562 words)

	Encyclopedia of Laser Physics and Technology - erbium-doped fiber amplifiers, EDFA, optical fiber communications
		Erbium-doped fiber amplifiers are the by far most important fiber amplifiers in the context of long-range optical fiber communications.
		The one at the input prevents light originating from amplified spontaneous emission from disturbing any previous stages, while the isolator at the output avoids lasing (or possibly even destruction) in case that output light is reflected back to the amplifier.
		The noise figure of an EDFA is somewhat larger than the theoretical limit of 3 dB for a high-gain amplifier; this is mainly due to the quasi-three-level nature.
	www.rp-photonics.com /erbium_doped_fiber_amplifiers.html (1629 words)

	Multiwavelength Laser Utilizes Erbium-Doped Fiber Amplifier
		In a homogeneously broadened erbium-doped fiber amplifier, wavelengths compete, one or several wavelengths win the competition, and the others are extinguished.
		Although fiber loops at both ends of the resonator serve as laser mirrors, the laser itself is linear, not a ring.
		Acting as the other laser mirror, another fiber loop comprised an optical circulator, the output coupler and the phase modulator, which was an all-fiber device driven by a piezoelectric transducer.
	www.photonics.com /content/spectra/2005/May/research/77553.aspx (796 words)

	erbium-doped-fiber Fibercore Limited
		Erbium doped fiber remains a key product for Fibercore Limited, demonstrated by our continued commitment to the development of new and existing product lines.
		Fibercore's erbium doped fiber product offering now extends to no less than 6 'standard' products for all EDF applications.
		In 1988, Fibercore offered the World's First commercially available EDFA fiber and growing on this success, now offer a complete range of erbium doped fibers designed to meet every amplifier configuration and ASE application.
	www.erbium-doped-fiber.com /erbium-doped-fiber.html (172 words)

	JDSU Benchtop Erbium-Doped Fiber Amplifier
		The Benchtop Erbium-Doped Fiber Amplifier (EDFA) amplifies optical signals across the EDFA window (1528 to 1610 nm).
		Through optimization of amplifier gain, noise figure, and saturated output power, the EDFA will expand your test capabilities in systems, components or sub-assembly manufacturing as well as research and development (R&D) environments.
		The amplifier incorporates a unique design to produce maximum signal gain and saturated output power in the 1550 and 1590 nm test bands while minimizing noise figure.
	www.jdsu.com /test_and_measurement/products/descriptions/BenchtopEDFiberAmplifier/index.html (188 words)

	Erbium Doped Fiber Amplifier - DWDM Model - oemarket.com
		Erbium Doped Fiber Amplifier - DWDM Model - oemarket.com
		EDFA DWDM model is designed and manufactured especially for applications in dense WDM optical networks.
		Following three sub-types are provided under this class to meet the optical amplification requirement on different segment of DWDM networks.
	www.oemarket.com /product_info.php?products_id=147 (259 words)

	Erbium-Doped Fiber
		StockerYale offers a range of standard erbium-doped fibers for amplifier and ASE applications.
		Our erbium fibers feature low background loss and excellent spool-to-spool uniformity.
		That StockerYale's specialty optical fiber fabrication facility is ISO 9001:2000 certified?
	www.stockeryale.com /o/fiber/erbium.htm (48 words)

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