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亞歷山大‧葛拉罕‧比爾 (Alexander
Graham Bill) 在1880年6月3日發明了光影電話 (photophone)
貝爾的光影電話是以光波來傳遞聲音。一個人的聲音能夠透過鏡子工具得到反射。而聲音的震動會在鏡子上造成類似的震動。接著把陽光反射到鏡子上，而這些震動就會被進一步投射到光影電話的接受器之上，並震動也再次被轉換成為聲音。
貝爾花了很多時間，才把光影電話的概念付諸實踐。一開始完成的機器有一項很大的缺點：當天氣轉陰的時候，機器就不能用了！現在，數位聲音與資料的傳輸透過稱之為光纖的玻璃纖維以光速傳送著。
Bell's photophone was based on transmitting sound on a beam of light. A person's voice was projected through an instrument toward a mirror. The vibrations of the voice caused similar vibrations in the mirror. Sunlight was then directed into the mirror, where the vibrations were captured and projected back to the photophone's receiver. There they were converted back into sound.
It took a long time before the idea behind Bell's photophone became practical. The original machine had a big flaw: when the weather was cloudy it didn't work! Today, digital voice and data communications are transmitted at the speed of light through glass fibers called optical fiber.
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