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Updated: May 16, 2026

Writing Bragg Gratings in Multicore Fibers
Published on: April 20, 2016
Visible-band dispersion by a tapered air-core Bragg waveguide
1ECE Department, University of Alberta, 2nd Floor, 9107-116 St. NW, Edmonton, AB, T6G 2V4 Canada.
Abstract:
We describe out-coupling of visible band light from a tapered hollow waveguide with TiO(2)/SiO(2) Bragg cladding mirrors. The mirrors exhibit an omnidirectional band for TE-polarized modes in the ~490 to 570 nm wavelength range, resulting in near-vertical radiation at mode cutoff positions. Since cutoff is wavelength-dependent, white light is spatially dispersed by the taper. Resolution on the order of 2 nm is predicted and corroborated by experimental results. These tapers can potentially form the basis for compact micro-spectrometers in lab-on-a-chip and optofluidic micro-systems.
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