Hi Jyoti,
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.)