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A new laser has been developed which has the potential to increment by orders of magnitude
the data transmission flow rate in the optical-fibre network OFC cable system which is the
main connectivity and is the backbone of the internet.
California Institute of Technology (Caltech) has hit the bull's eys in developing such a system .
The Light is such a powerful element and can carry huje amounts of information which is
almost a 10,000 times more bandwidth than microwaves which is the earlier carrier of long-
distance communications.
Here the laser light is spectrally pure and to a single frequency . The purer the tone, the more
information it can carry, and researchers have been trying to develop a laser that comes as
close as possible to emitting just one frequency.
Distributed-feedback semiconductor (S-DFB) laser, developed in mid-1970s, are still used today.
The S-DFB laser's unusual longevity in optical communications stemmed from its, at the time,
unparallelled spectral purity - the degree to which the light emitted matched a single
frequency.
It can attain clarity by using a nanoscale corrugation within the laser's structure that acts like a filter.
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