Can the deployment of ultra fast broadband (UFB) drive firms’ adoption of digital tools? We tackle this question by studying the impact of the French policy « France Très Haut Débit », which led to the progressive deployment of UFB in non-dense areas (representing 43% of the French population). Thanks to large scale annual company surveys, we can t...
Published in Frontiers of optoelectronics
Polarization, a fundamental behavior of electromagnetic waves, holds immense potential across diverse domains such as environmental monitoring, biomedicine, and ocean exploration. However, achieving efficient modulation of terahertz waves with wide operational bandwidth poses significant challenges. Here, we introduce an all-silicon polarization co...
This paper presents the first Arbitrary Waveform Generator (AWG) based on Walsh’s theory for wideband radio frequency (RF) conversion. The architecture is dedicated to 5G-FR1 applications (sub-6GHz) to perform a direct and large bandwidth conversion while achieving the highest energy efficiency. The circuit generates Walsh sequences weighted by Wal...
Published in EPJ Web of Conferences
We perform broadband cavity ring-down spectroscopy (CRDS) relying on the near-infrared frequency comb as the excitation source and a time-resolved mechanical Fourier transform spectrometer as detection device. The many decays corresponding to each spectral element are recorded simultaneously and sorted after Fourier transformation to yield the CRDS...
Published in EPJ Web of Conferences
Analog photonic techniques can perform better than conventional digital electronics, which have significant limitations when it comes to processing fast RF signals on the fly. We show that a simple photonic architecture, based on a bi-directional frequency-shifting loop, makes it possible to calculate in real time the cross-correlation function of ...
Thermoacoustic instabilities can cause significant pressure oscillations and potentially lead to the failure of combustion systems. These instabilities result from the interaction between heat release fluctuations and acoustic waves. One potential solution to mitigate thermoacoustic instabilities is to use passive acoustic damping devices, referred...
The Covid-19 pandemic raised greater awareness to ways in which societies have become dependent upon access to technology and the Internet. The shift to remote-only education, in particular, forced the recognition of compounded problems faced by poor and economically disadvantaged families with school-age children. Millions of children, particularl...
Published in Journal of telemedicine and telecare
Telehealth is a rapidly growing modality for expanding healthcare access, especially in the post-COVID-19 era. However, telehealth requires high-quality broadband, thus making broadband a social determinant of health. The objective of this study was to evaluate the association between broadband access and telehealth utilization across the United St...
Published in Journal of colloid and interface science
Super broadband optical absorbers with ultrathin films have been keenly pursued for a long time. Although highly lossy materials with sharp light attenuation have the potential to become super absorbers, a large percent of light from free space is inevitably reflected back for the distinct impedance mismatch. Here, a simple strategy, of which reduc...
