Waveguides Simultaneously Transmit Short and Long Electromagnetic Waves

Abstract

Researchers at the University of Central Florida have created waveguides capable of simultaneously transmitting both short and long wavelength EM signals. Often used to transmit electromagnetic (EM) signals, optical fibers sometimes transmit signals of varying wavelengths, such as signals from opposite ends of the EM spectrum, from microwaves to infrared (IR). Due to the fibers' geometry, these transmissions typically require multiple fibers, where each fiber is configured to guide waves within a limited wavelength range. This large number of fibers increases the complexity of the communication systems utilizing them.

The UCF invention reduces this complexity. In some cases, the waveguides can transmit signals that have at least a two-fold difference in wavelength. This revolutionary method can be used in nonlinear optical interactions involving EM waves in different bands. It can also be used within a universal cable for EM wave transmission, which, for example, can reduce the bulk of cables in Navy vessels. The waveguides can also be used in nonlinear imaging (such as excitation in visible/near-infrared wavelengths, fluorescence in IR, and microwaves).

Technical Details

The UCF invention entails waveguides comprising composite photonic crystal fibers (PCF) with one or more unit cells, each capable of transmitting relatively short wavelength EM signals. The unit cells are arrayed in a hexagonal pattern around a primary core capable of transmitting relatively long wavelength EM signals. The fractal-like geometry of the fibers, where the unit cells also function as PCFs, gives the ability to simultaneously guide waves with very different wavelengths, including waves from opposite ends of the EM spectrum.

Benefit

Market Application