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DGE stands for dynamic gain equalization.
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It’s a feature to avoid gain unflatness.
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Allow gain flatness and power adjustment for long distances Links specially DWDM and submarine applications.
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In long distances transmission we have to insert multiple stages of ILA.
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ILA ( inline amplifier ) add enough Gain to the signal but adding several ILAs may lead to gain unflatness.
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Some frequency channels will have gain values different from other channels.
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And some frequency channels will be much more attenuation than others.
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Then the gain curve become not flat as we increasing the number of cascaded ILAs.
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DGE is a node to solve this issue and recover the difference between flat Gain and actual gain values.
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It’s target to let all frequency channels have the same power values.
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Through tilt equalizers and shape equalizers we can adjust the gain and power dynamically.
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If OSNR degraded we have to use regeneration stage to recover the OSNR.
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