Home Forums GENERAL EDFA black box

  • This topic has 7 replies, 3 voices, and was last updated 9 years ago by koll.
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    • #27367
      koll
      Participant

      1)How does the EDFA black box fixed gain in the gain controlled mode?

      2)And for power-controlled, is it controlling the input power or pump power? And How it control the power in power-controlled mode?

    • #27375
      alistu
      Participant

      Hi Koll,

      I suggest that you go through the help section of the EDFA black box, as there is an extensive and comprehensive explanation of the function performance there with relations there.

      Regards

    • #27377
      koll
      Participant

      Hi Alistu

      My opticsystem expired. So I can’t access it anymore.

    • #27378
      Alessandro Festa
      Participant

      1) In controlled gain mode, the EDFA operates with a fixed gain G, which means that the output power will alwaus be Pout=Pin+G
      2) In power controlled mode, the EDFA output power is fixed, no matter the input power (obviously Pin must be less than Pout!). So it is not controllin input power or pump power, but it automatically adjust pump power to reach the desired Pout.

      • #27387
        koll
        Participant

        Thank you Alessandro,

        Another questions

        1)What will be the output optical power level of the EDFA with input 1550 nm power when the 980 nm pump light is completely turned off?

        • #27393
          Alessandro Festa
          Participant

          1) It depends on the Erbium fiber length…the longer the active fiber, the lower the output power when pump is off

          2) Erbium fiber length must be optimized & you can use GFF (gain flattening filter) to equalize the wavelengths at the output of the EDFA.

        • #27394
          koll
          Participant

          1) It depends on the Erbium fiber length…the longer the active fiber, the lower the output power when pump is off

          Do you have an example? Thank you.

    • #27386
      koll
      Participant

      Thank you!

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