Reply To: Difference between using optical amplifier and EDFA

[Naazira BadarParticipant]

Hi Aabid..
Yes, you are right.The EDFA length can’t be increased beyong optimum. Because for a particular pump power, its gain increases upto a certain length and beyond that it decreases actually. This happens because the pump power isn’t enough to excite the doped ions of the entire length. Hence the unexcited region of the length absorbs certain part of the signal energy. Hence loss could be observed.

This has been nicely explained by Keiser. Here’s link to the page:

https://books.google.co.in/books?id=5JeN4QhYo8kC&pg=PA405&lpg=PA405&dq=after+a+certain+length,+the+EDFA+gain+decreases&source=bl&ots=Z_X1pUr48q&sig=biJNG7x1rHKLTnEJDJw4ooFRswE&hl=en&sa=X&ved=0ahUKEwj85qzr5qHLAhVMkI4KHdUqB6MQ6AEIOjAF#v=onepage&q=after%20a%20certain%20length%2C%20the%20EDFA%20gain%20decreases&f=false

Cheers. (y)

Regards.