A Cross-Section Through One of the Bespoke Optical Fibers (IMAGE)
Caption
This fiber, termed a photonics bandage fiber, is formed by stacking rods of germanium doped silica in a hexagonal pattern but replacing the very center rod with just silica to form the core of the fiber. This microstructure allows only light with a wavelength within a certain range to propagate with low loss in the core, effectively acting as a filter for those wavelengths that lie outside of this range. This photograph has been taken by illuminating a piece of the preform under a white light microscope, the colorful patterns arise because of the germanium doped silica guiding the white light through the structure.
Credit
University of Bath, Centre for Photonics and Photonic Materials.
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Credit to University of Bath, Centre for Photonics and Photonic Materials.
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