Contrary to current trends, the CPU may get bigger in the
future. Yes, the size of CPUs are larger today than they were in
the past, but they also pack in more transistors. The future may
involve larger CPUs but with a much lower density of transistors.
Why? Because of optics.
The idea of purely optical computers—and hybrid
electronic-optical computers—is not new. But a set of recent
advances is the first time I’ve thought we
might be entering an era where some functions beyond long-distance
communication will be handled optically.
Have you seen the light?
There are two properties of optical computers that make them
attractive. The first is that they are naturally fast: light pulses
travel at (yes) the speed of light. And when light switches
light—the optical equivalent of a transistor—it happens very
fast (think femtoseconds, which are 10-15 of a second). These two
properties combine to make optical computers much faster than
Source: FS – All – Science – News
The future of high-speed computing may be larger CPUs with optics