Technology:
NTT developed a
technology to halve the power consumption of an LSI. The new technology uses
light in place of electrons to send and receive signals. A semiconductor
element with a new structure proved that signals can be sent by light at reduced
power consumption. The newly-developed semiconductor element sends out signals
of 10 gigabits per second. It can oscillate laser at 5.5 fj (femto joule) per
bit in terms of energy. It was necessary to reduce energy consumption to less
than 10 fj for the signal transmission using light, but the traditional
technology was not able to reduce energy consumption to less than 80 fj. Large
energy consumption for the oscillation of laser needed to be solved.
NTT’s research team
built an originally-designed element with its self-developed semiconductor that
sends out laser beam and confirmed that it can send information by light
signals. Exchange of signals between transistors is required for the information
processing inside an LSI. The new technology reduced this energy consumption
considerably, halving LSI’s power consumption in the long run. NTT plans to a
technology to connect LSIs on an electronic substrate by light signals in six
years and connect transistors in nine years. This NTT’s achievement was
published on the May 26 issue of the Nature Photonics of Great Britain.
The next-generation video conference system
being developed by NTT
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