问题描述：
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对于ZXWM M900设备组成的80波长距离系统，系统调试时如果发现非线性效应非常严重，下面哪些那操作可以减轻非线性效应带来的影响（）For the 80-wavelength-distance system that is made up of ZXWM M900 equipment， if non-linear effect is detected to be very serious during the system commissioning， which operations below can be used to alleviate the influence of the non-linear effect？（）
A．适当降低发端的入纤光功率Decrease the fiber-input optical power at the transmit end;
B．适当降低线路OA的增益Decrease gain of the line OA;
C．将下游OPA收端加的衰耗器改加在上游OBA的发端Remove the attenuator installed at the receive end of the downstream OPA to the transmit end of the upstream OBA;
D．若采用了EONA单板，如需加衰耗器，则将衰耗器加在DCM1口上In case that the EONA board is used, you should add an attenuator to the DCM1 port if necessary;
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上一篇：某干线A—B为超长距无电中继系统，共计22个跨段，全长1600km。开通过程中现场出现信噪比较低、信噪比平坦度较差现象，可以采用哪些处理来改善这些指标（）A trunk line from A to B utilizes ultra-long non-electrical regenerator DWDM system， covers 22 spans and is totally 1600 km long． During the system commissioning， it is found that the signal noise rate （SNR） is low and the flatness of SNR is poor． Which of the following measures can be taken to optimize these indices？（）
下一篇：导致光传输系统中通道功率的不平衡的原因有（）Which of the following factors may lead to channel power imbalance in the optical transmission system？
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