WHY the gain after SOA can less than 1 or 0dB?
As mentioned in the title, why travelling wave SOA or Wideband SOA can produce a gain less than 1 or 0dB.
In my recent work, I need the SOA gain close to its transparency region, so that in the presence of another signal control pulse, the gain will go down to 1 or 0dB. But it cannot be realized when the gain characterization curve keep going down linearly as the input power increase.
Why it happens and how to fix it?
please help me!
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