Highly-Chirped Bragg Gratings for Integrated Silica Spectrometers
Abstract
A blazed chirped Bragg grating in a planar silica waveguide device was used to create an integrated diffractive element for a spectrometer. The grating diffracts light from a waveguide and creates a wavelength dependent focus in a manner similar to a bulk diffraction grating spectrometer. An external imaging system is used to analyse the light, later device iterations plan to integrate detectors to make a fully integrated spectrometer. Devices were fabricated with grating period chirp rates in excess of 100nm/mm, achieving a focal length of 5.5mm. Correction of coma aberrations resulted in a device with a footprint of 20mm x 10mm, a peak FWHM resolution of 1.8nm, a typical FWHM resolution of 2.6nm and operating with a 160nm bandwidth centered at 1550nm.
Keywords
Cite
@article{arxiv.2001.09163,
title = {Highly-Chirped Bragg Gratings for Integrated Silica Spectrometers},
author = {James W. Field and Sam A. Berry and Rex H. S. Bannerman and Devin H. Smith and Corin B. E. Gawith and Peter G. R. Smith and James C. Gates},
journal= {arXiv preprint arXiv:2001.09163},
year = {2020}
}
Comments
13 Pages, 8 figures