If we talk about optic communication history, who don’t know picture in the left.
Hehehe.. Yes, we don’t know picture in the left if we don’t see word in bottom of the picture which is written Alexander Graham Bell.
Why is connection ‘Alexander Graham Bell’ with optic communication history?
In 1880, Alexander Graham Bell made a device which is called photo-phone.
Basically, photo-phone use sun light which is reflected from a voice-modulated thin mirror to bring voice. At the receiver side, sun light which is modulated will touch a photo-conducting selenium-cell and afterward change it to electrical current. After that, a telephone receiver is made to completely that system.
Although Photo-phone work very good, but Photo-phone never achieve commercial success.
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