问题描述：
[多选]
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？
A．放大器的级联使用。Amplifiers are cascaded.
B．人为地改变系统中OA的增益。The gain of the OA board in the system is changed manually.
C．在大容量系统中，特别是在长跨段/大损耗跨段系统中，入纤功率较高且通道之间波长间隔小，产生Raman效应。 High fiber-input power and small channel spacing in a large-capacity system, especially one featuring long span or great loss, lead to Raman effect.
D．滤波型器件插损不一致导致的系统功率的不一致。The filter component provides different insertion losses, leading to inconsistent power among channels.
E．色散补偿元件通道插损的差异。The dispersion compensation component provides different insertion losses-.
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上一篇：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？（）
下一篇：为了调平WDM系统各功率点的功率平坦度，可以利用系统中存在的功率调节单板（）。 Which of the following power modulation boards of the system can be used to optimize the power flatness at different nodes of the WDM system？（）
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