Which of the following operations may be a bit error due to nonlinear effects?

Which of the following operations may be a bit error due to nonlinear effects?
A . Replace the optical amplifier board at the transmit end with a Raman board, and the bit error of the OTU board is reduced
B. Increase the gain of the optical amplifier at the transmitting end, and reduce the bit error of the OTU board
C. Reduce the output optical power of the sending end, and the bit error of the OTU board is reduced
D. Adjust the gain of the optical amplifier board at the receiving end to reduce the bit error of the OTU board

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Answer: C