So we know a white light is made of countless number of individual lights of different wavelength. the difference in wavelength is the one that give the RAINBOW its colour. Isn't that AMAZING!!, if you think is not then i don't know what could be more amazing.
This what Isaac Newton saw and by using a prism he was able to create his own rainbow..I tell you people of that time were mesmerized. He went on to write alot about light how it was reflected and refracted. Einstein was also fascinated by light and his work on light gave us these modern technologies we have today.
Typically we use wires to transmit data information and radio waves. The problem is wires have a finite bandwidth and can only travel at the speed of propagating electrons. You may say but electrons are faster..the answer is yes but look at the medium it is travelling in..copper wire act as a resistor to the electrons and hence slow them down and data deteriorate along a short distance compared to light travelling on a fiber optic cable.
The light has huge bandwidth meaning many information bundles can be crammed into a fiber. So we create a light source which is coherent (LASER) and use a modulator and start chucking those 101001010100101010101 onto fiber optic cable from USA to Kawe Kinondoni at the speed of how fast we can modulate the light. hahaha you say to the internet cafe attendant, "net today is much faster". The guy is sweating vigorously and i wont say what he is watching on the net..
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