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.是什么意思_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.在线翻译_英语_读音_用法_例句