Hi Jyoti,
And finally i want to share Advantages & Disadvantages of FRA
Advantages
Variable wavelength amplification possible
Compatible with installed SM fiber
Can be used to extend EDFAs
Can result in a lower average power over a span, good for lower crosstalk
Very broadband operation may be possible
Disadvantages
High pump power requirements, high pump power lasers have only recently arrived
Sophisticated gain control needed
Noise is also an issue
So, at the end i would like to say that we have different parameters to seek for usage of optical amplifiers ..
Pumping power, desired band of operation, gain, attenuation and its applications.
Thanks