This is not the latest version of this item. The latest version can be found here.
Chip-scale high-performance digital Fourier Transform (dFT) spectrometers
Name
1098306.pdf
Description
Published version
Size
1.54 MB
Format
Adobe PDF
Checksum (MD5)
c8a003546fac4d749a8bd87a70d4fb5c
Journal
Proceedings of SPIE - The International Society for Optical Engineering
Publisher
SPIE-Intl Soc Optical Eng
Version
Final published version
Abstract
© 2019 SPIE. On-chip spectrometers have recently emerged as a promising alternative to conventional benchtop instruments with apparent Size, Weight, and Power (SWaP) advantages for applications including spectroscopic sensing, optical network performance monitoring, RF spectrum analysis, optical coherence tomography, and hyperspectral imaging. Existing onchip spectrometer designs, however, are limited in spectral channel count and signal-to-noise ratio (SNR). Here we demonstrate a transformative on-chip digital Fourier transform (dFT) spectrometer that can acquire high-resolution spectra via time-domain modulation of a reconfigurable Mach-Zehnder interferometer. The device, fabricated and packaged using industry-standard silicon photonics technology, claims the multiplex advantage to dramatically boost SNR and unprecedented scalability capable of addressing exponentially increasing numbers of spectral channels. We further explored and implemented machine learning regularization techniques to spectrum reconstruction. Using an âelastic-D1' regularized regression method that we developed, we achieved significant noise suppression for both broad (> 600 GHz) and narrow (< 25 GHz) spectral features, as well as spectral resolution enhancement beyond the classical Rayleigh criterion. The dFT architecture and spectrum reconstruction techniques demonstrated in this work will drive future work in on-chip optical spectroscopy and enable practical realizations of high-performance chip-scale spectrometers with large (> 1,000) spectral channel counts.
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
10.1117/12.2518437
