The heart of an optical communication system is something which transmits electrical signals:a telephone,computer or cable TV.A light emitting diode or laser converts those signals into light pulses,which travel along a glass fiber,At the receiving end,a photo detector converts them back to electrical signals.
光学的沟通系统的心是传输电的信号某事: 电话 , 计算机或有线电视。一个发出两极管或激光的光把那些信号转换成轻的脉膊, 这向前旅行一个玻璃纤维,在收受结束，一个相片发现者把他们转换回电的信号.
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