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WHY the gain after SOA can less than 1 or 0dB?

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(joined August 2020)
Participant

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!

Responses (1):

    • #68112
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      eli
      Participant

      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!

    • #68116
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      Ahmad Atieh
      Moderator

      Hello Eli,
      please send me your project as a zip file to ahmad.atieh@optiwave.com and I’ll check it for you.
      Which version of OptiSystem are you using?
      Regards,
      Ahmad

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