Relationship between the gain and noise figure of an EDFA


The noise figure (NF) of an EDFA can be calculated according to the following formula: NF = Pase/(H*V*Δv;V*G)
NF: noise figure
Pase: noise per 0.1 nm
H: Planck constant [6.6260755 ± 0.0000040) x 10-34J-s]
V: signal frequency
Δv: 12.5 GHz (0.1 nm)
G: OA gain
Obtain the logarithm: Pase = NF + G �?58

According to the preceding information, a larger OA gain results in a larger NF.

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Relationships among the node gain compensation offset, line attenuation, and node gain
Node gain compensation offset is an NMS parameter used during ALC configuration. This parameter needs to be set when the upstream and downstream OA boards produce different nominal output power values. The parameter is used to adjust the gain compensation value of a node. After the compensation is complete, a wider gain range or attenuation adjustment range of the node is allowed. When the gain detected on the node is abnormal, gain compensation offset increases or decreases the anomaly threshold of the node. The following formula is used to compute the gain compensation offset of a node: Compensation offset for the node = Line attenuation �?Node gain + Nominal output optical power difference between upstream and downstream OA boards If ALC is configured in E2E mode, this parameter can be automatically computed since V100R007C02.

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