A5068708170- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Semiconductor Lasers and Optical Devices
- Artificial Intelligence in Healthcare
- Private Equity and Venture Capital
- Global Healthcare and Medical Tourism
- Healthcare Systems and Public Health
- Silicon Nanostructures and Photoluminescence
- Orbital Angular Momentum in Optics
- Acoustic Wave Resonator Technologies
- Seismic Waves and Analysis
- Neural Networks and Reservoir Computing
- Advancements in Semiconductor Devices and Circuit Design
- Magneto-Optical Properties and Applications
- Advanced Optical Sensing Technologies
- Particle Detector Development and Performance
- Advanced MEMS and NEMS Technologies
European Organization for Nuclear Research
2022-2023
University of Padua
2017-2022
KTH Royal Institute of Technology
2016-2017
A single-transmitter/single-receiver THz link (0.3-0.5 THz) with a record net data rate of 260 Gbit/s is experimentally demonstrated. Spectrally efficient multi-channel signal transmission enabled by novel frequency-band-allocation scheme pre-and-post-digital equalization.
Silicon photonics (SiPh) shows considerable potential as a radiation-hard technology for building the optical data transmission links future high-energy physics (HEP) experiments at CERN. Optical modulators are key component of links, which will need to withstand radiation doses in excess 10 MGy. The geometrical parameters and doping concentrations two popular types SiPh modulators, Mach–Zehnder ring (RMs), have been varied order study their impact on device tolerance. They were exposed an...
A data analysis algorithm for OFDR-based distributed acoustic sensing (DAS) is proposed, which achieves high bandwidths of tens kilohertz with sharp spatial resolutions in the order centimeters. The non-idealities setup as well phase noise affecting measurement are analyzed and a method to compensate them experimentally demonstrated. performance sensor evaluated by extensive experimental tests, showing viability proposed technique achieve frequency resolution sensing.
We experimentally demonstrate a single channel 32-GBd 16QAM THz wireless link operating in the 0.4 band. Post-FEC net data rate of 106 Gbit/s is successfully achieved without any spatial/frequency multiplexing.
Abstract Future upgrades of the CERN Experiments and Accelerators require optical links capable handling large data volume generated in particle detectors beam position (BPMs) sensors. Silicon Photonics transceivers are a promising candidate to process required rate as well efficiently operate harsh radiation environment. We present experimental characterisation silicon modulators together with demonstration transmitters based on custom designed integrated circuits.
Abstract Future upgrades of CERN experiments will require low power optical data links to support ever-increasing data-rates at ever-higher radiation levels. Silicon photonics is a CMOS optoelectronic technology compatible with these requirements. We present the results an transceiver proof concept based on silicon integrated circuit coupled existing tolerant electronic ASICs.
Thanks to their characteristics, optical fiber sensors are an ideal solution for sensing applications at cryogenic temperatures, such as the monitoring of superconducting devices. Their applicability however, is not immediate fibers exhibit a non-linear thermal response which becomes rapidly negligible below 50 K. A thorough analysis down temperatures then necessary correctly translate interrogation readings into actual temperature. Moreover, increase sensitivity few kelvin, special coatings...
Chirped pulse phase-sensitive optical time-domain reflectometry (chirped Φ-OTDR) allows the interrogation of tens kilometers fiber with high sensitivity and linearity, but typically spatial resolution limited to ten meters ensure proper processing signal-to-noise ratio (SNR). In this paper, we propose a method increase chirped Φ-OTDR without reducing width. The improvement is achieved by adding an carrier input applying digital filtering measured backscatter traces. Experimental results...
Conventional chirped-pulse (CP) phase-sensitive optical time-domain reflectometry (CP φ-OTDR) allows the interrogation of tens kilometers fiber with high accuracies millikelvin or nanostrain. With respect to standard coherent-detection φ-OTDR, it shows increased robustness coherent fading and a linear quantitative monitoring perturbations acting on fiber. Its spatial resolution, however, remains critical parameter new techniques allowing its improvement without reducing significantly other...
Abstract The upgrade of CERN’s accelerator complex requires improved beam instrumentation systems that will generate an increased volume data to be transferred from the radiation areas back-end. A solution increases throughput already deployed fibers, with minimal increase system complexity, consists in implementing coarse wavelength division multiplexing (CWDM) technique where independent optical carriers at properly spaced wavelengths are multiplexed into a single fiber. In this paper we...
When a disturbance acts on fiber it induces change in the local refractive index that influences backscattering trace. If chirped pulse φ-OTDR setup is used to interrogate fiber, this appears as shift of received trace, linear acting perturbation. However, round trip time all components generated by further sections well. Due high sensitivity φ-OTDR, components, which usually negligible, may appear virtual perturbation certain conditions. In letter we derive mathematical model for induced...
We present an analytical and numerical description of coupling between OAM modes in hollow ring-core fibers affected by stress birefringence ellipticity The analysis paves the way to a better modeling propagation these fibers.
Abstract Silicon photonics technology promises significant improvements for fibre optic links of future upgrades HEP experiments. Such systems will require high levels radiation tolerance and silicon modulators have been shown to be very robust when exposed under certain conditions. We demonstrate the first time that changing temperature ring during or after irradiation can significantly improve their performance.
The paper reports a machine learning approach for estimating the phase in distributed acoustic sensor implemented using optical frequency domain reflectometry, with enhanced robustness at fading points. A neural network configuration was trained simulated set of signals that were modeled after Rayleigh scattering pattern perturbed fiber. Firstly, performance verified another numerically generated profiles to compare achieved accuracy levels standard homodyne detection method. Then, proposed...
Any temperature change or strain acting on a section of the fiber induces local variation refractive index. If is monitored by chirped pulse φ-OTDR system, index causes shift backscattering trace and produces in round trip time light coming from any further position fiber. While usually negligible, due to high sensitivity φ-OTDR, extreme occasions distributed may appear measurement as an undesired "virtual" perturbation. In this paper, we discuss experimentally validate mathematical model...
The thermal responses at cryogenic temperatures (5-300 K) of optical fibers with four different coatings are experimentally measured by means frequency domain reflectometry. An estimate the sensitivities is reported.
The cool-down and powering of a high temperature superconductor mag- net have been monitored by means optical frequency domain reflectometry. fibers integrated in the structure to sense thermal perturbations deformations.