There is huge progress in Technology and Engineering
it has reached its hight up to the sky or more higher then that.
a new technology of Optical fiber is used for transfering DATA at very high speed
in which a moduletor modulates the signal into light by using LED
this light is transfered by optical fibers by the law of dispersion of light
light is recived at other end there is a photo electric diode which converts light energy into electrical energy this electrical signals are demodulated and thus data is transfered.