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【单选题】
在信息传输速率相同的条件下,多模光纤的传输距离要比单模光纤小 得多,主要原因是什么?A.
多模光纤比单模光纤便宜一些
B.
多模光纤中的模间色散现象会引起所传输的光信号产生畸变，且传输距离 越大，畸变程度越严重
C.
传输距离越大，多模光纤中的光信号的衰减越严重
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