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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
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