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恐怖的跨海光缆！长达39万公里！国家间通信靠它了！太厉害了啊
海底光缆是用绝缘外皮包裹的导线束铺设在海底，海水可防止外界光磁波的干扰，所以海缆的信噪比较高；海底光缆通信中感受不到时间延迟。海底光缆的设计寿命为持续工作25年，而人造卫星一般在10到15年内就会燃料用尽。
光纤 通信33/87
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