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Shorter wavelengths get you into the microwave regime, i.e. use air or vacuum for the "fiber core." Back to optical comms, then: Much of the design parameter space does depend on available material for the fiber and the driving lasers (absorption loss vs. wavelength is a major concern). And there are "holey fibers" which in fact have an ...


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You want both a laser that is easy to make and a material that can transmit that laser with low losses (transparent) and is also easy to make. Also, for a gut feeling, 1THz is starting to become like a radio wave. Think about how radio waves seem to like to spill everywhere rather than stay confined inside a material. Also, shorter wavelengths make the ...


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