E D F A
What is EDFA Stands for “Erbium Doped Fiber Amplifier” Used to boost the intensity of optical signals being carried through a fiber optic communications system Has a fiber whose core is heavily doped with Erbium ions Operates in the C band (1530-1560) and L band (1570-1610)
Origin of EDFA (Who, When and Where) Prof.David Payne and team Published the research paper in the year 1987 At the University of Southampton, UK
Why Erbium? Erbium has several important properties that make it an excellent choice for an optical amplifier Erbium ions (Er3+) have quantum levels that allows them to be stimulated to emit in the 1540nm band, which is the band that has the least power loss in most silica-based fiber. Erbium's quantum levels also allow it to be excited by a signal at either 980nm or 1480nm, both of which silica-based fiber can carry without great losses
How it works
Basic block diagram of EDFA
Block diagram of EDFA
Block diagram of EDFA Counterpropogating Pump EDFA
Characteristics of EDFA
Characteristics of EDFA (Contd….)
Characteristics of EDFA (Contd….)
Advantages Commercially available in C-band & L-band Insensitivity to light polarization state High gain Low noise figure: 4.5 dB to 6dB No distortion at high bit rates Immunity to cross talk among wavelength multiplexed channels
Advantages (Cont…) Do not require high speed electronics Independent of bit rate (Bit rate transparency)
Drawbacks Need to use a gain equalizer for multistage amplification Difficult to integrate with other components
Companies You name them………. and they are there
References DWDM Fundamentals, Components and Applications by Jean-Pierre Laude Fiber Optic Communication Technology by Djafar K.Mynbaev and Lowell L.Scheiner www.soton.ac.uk www.photon-x.net/tech/edfa.htm www.webopedia.com www.mse.vt.edu
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