Hello,
Today, I will share with you a wavelength technical post knowledge concerning the Raman amplifier advantages and disadvantages.
Raman fiber amplifier has three outstanding characteristics:
1- The gain wavelength is determined by the wavelength of the pump light. As long as the wavelength of the pump source is appropriate, theoretically signal amplification at any wavelength can be obtained. This feature of the Raman fiber amplifier allows the Raman fiber amplifier to amplify the band that EDFA cannot amplify. Using multiple pump sources can also obtain a much wider gain bandwidth than EDFA (the latter is limited by the energy level transition mechanism, the gain The bandwidth is only 80nm). Therefore, it has an irreplaceable role in the development of the entire low-loss region of optical fiber 1270nm-1670nm.
2- The gain medium is the transmission fiber itself; this allows the Raman fiber amplifier to perform online amplification of the optical signal to form a distributed amplification, realize long-distance relayless transmission and remote pumping, especially suitable for inconvenient establishment of submarine optical cable communication, etc. In the case of repeaters, and because the amplification is distributed along the fiber rather than concentrated, the signal optical power in the fiber is relatively small, which can reduce the interference of nonlinear effects, especially four-wave mixing (FWM) effects.
3- The low noise figure makes it possible to greatly reduce the noise figure of the system and increase the transmission span when mixed with conventional EDFA.
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