EDFA- and RAMAN-amplifiers

Amplifier (Booster), to increase the output power at the beginning of the link

Pre-Amplifier (PreAmp), high input sensitivity. Increasing the power level at the end of the transmission line according to receiver sensitivity

Inline-Amplifier, to compensate the attenuation of the link

RAMAN-Amplifier, increasing the power level, at the end of the link by use of Raman scattering. Amplification is achieved with improved OSNR behavior and reduction of nonlinear impairments

EDFA (Erbium Doped Fiber Amplifier) principle

EDFAs use a pump laser (980 nm or 1480 nm) to bring up electrons to a higher energy level. If signal amplification is achieved by emitted photons of the same signal wavelength with the help of stimulated emission.

EDFA principle
EDFA principleClick on the image to enlarge

Wavelength:           C-Band and L-Band
Amplification           20 - 40 dB
Output power:        14 - 23 dBm

RAMAN-amplifier principle

A Raman amplifier uses the effect of Raman scattering. For this purpose, light with high power and a corresponding wavelength is pumped into the fiber. Amplification is performed if the incoming wavelength lies within the Raman gain spectrum.

RAMAN-Amplifier principle
RAMAN-Amplifier principleClick on the image to enlarge

Wavelength area:   1300 - 1600 nm
        10 - 15 dB

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