问题:
In the OSNR model for EDFA amplifiers, SNR OUT = 1/(1/SNR IN + FhvB/P IN ),
what does SNR IN represent?()
A . the signal to noise of the current optical amplifier
B . the signal to noise of the previous amplifier or source
C . the signal to noise introduced by the optical multiplexer
D . the accumulated noise to signal ratio of the optical channel
In the OSNR model for EDFA amplifiers, SNR OUT = 1/(1/SNR IN + FhvB/P IN ),
what does SNR IN represent?()
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