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.

• 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.