I also want to bring to your notice that In optical fiber library we have different types of amplifier lke Raman amplifier, EDFA amplifier and Semiconductor optical amplifier(SOA).I want to share characteristics of different amplifiers, now the selection of different amplifiers depends upon its application, feasibilty, power pumping availability we have.
Characteristics of SOA types:
Polarization dependent – require polarization maintaining fiber, Relatively high gain ~20 dB , Output saturation power 5-10 dBm, Large BW
Can operate at 800, 1300, and 1500 nm wavelength regions., Compact and easily integrated with other devices, Can be integrated into arrays , High noise figure and cross-talk levels due to nonlinear phenomenon such as 4-, wave mixing. This last feature restricts the use of SOAs. Limited in operation below 10 Gb/s. (Higher rates are possible with lower gain.
Thanks