问题描述：
[多选]
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？（）
A．降低高功率光放大板的饱和输出光功率Decrease the saturation output power of the high-power optical amplifier board
B．采用“信道内测试噪声法”进行信噪比测试Test SNR with the "in-channel noise testing" method
C．将有必要的衰耗器加在OTS段的发端，减小入纤光功率Install necessary attenuator at the transmit end of the OTS section to reduce fiber-input power
D．增大DCM模块补偿的距离Increase the compensation distance of the DCM module
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上一篇：为保证系统的全程功率控制，中兴ZXWM M900 DWDM系统采用了哪些功率控制技术？To ensure the whole-process power control of the system， the ZXWM M900 DWDM system adopts which of the following power control technologies？（）
下一篇：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？（）
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