Erbium doped fibre amplifier is most commonly used. This is actually a laser system. Erbium doped silica glass fibre is acting as the active medium. This amplifier is temperature consistent and here gain is independent of the state of polarization. Fibre Raman amplifier makes use of stimulated Raman scattering. Fibre Brillouin amplifier is a system which works on the basis of stimulated Brillouin scattering.
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