Editorial: Applications of photonic sensors in smart cities

This Research Topic on “Applications of Photonic Sensors in Smart Cities” belongs to the journals, Frontiers in Communications and Networks and Frontiers in Physics. For this Research Topic serves as lead guest editor and other guest editors include Saadi et al. Demostenes Z. Rodriguez, Lunchakorn Wuttisittikulkij, and Tien Khee Ng. The aim of this Research Topic is to highlight recent advancements in the field of Quantum Optics and Information, Photonic sensors, and optical wireless communication and how they can contribute tomaking smart cities.We received an overwhelming response to our call for papers and, after a rigorous peer review process, eight papers were selected for this Research Topic. The managing editor, Saadi et al. and the guest editors would like to thank all authors who submitted their papers to this Research Topic. Thanks are also due to all anonymous reviewers, whose timely feedback ensured the high quality of the journal, and the Frontiers publication team for helping this issue to be a success. All the Guest Editors hope that this Research Topic can provide an in-depth insight into the field of optical wireless communication, photonic sensors, and optoelectronics that help realize the vision of smart cities. The first paper title is “Calculation of the Coupling Coefficient in Step-Index Multimode Polymer Optical Fibers Based on the Far-Field Measurements”, in which the authors use the power flow equation (PFE) to investigate mode coupling in step-index multimode polymer optical fiber. The second accepted paper title is “Porous Silicon–Based Microring Resonator for Temperature and Cancer Cell Detection”, in which a microring resonator sensor based on porous silicon is proposed for temperature and cancer cell detection, simultaneously. The results presented in this paper are promising, suggesting that the microring resonator sensor can be used in the fields of environment sensing, temperature sensing, chemical sensing, and biosensing. The third accepted paper title is “Broadband Coherent Mid-Infrared Supercontinuum Generation in All-Chalcogenide Microstructured Fiber with All-Normal Dispersion”, in which a numerical demonstration of the generation of broadband coherent supercontinuum (SC) spectra in the mid-infrared region using dispersion-engineered all-chalcogenide microstructured fibers (MOFs) is presented. Such sources can be applied in frequency metrology, optical coherence tomography, biomedical imaging, and few-cycle pulse compression. OPEN ACCESS