We propose and demonstrate an approach to the generation of an ultrawideband (UWB) pulse utilizing the nonlinear dynamics of a semiconductor laser (SL). The output UWB chaotic optical pulses generated by the SL with optical feedback can be controlled when the feedback strength and driving current of the SL are tuned. Our experiment proves that the spectrum characteristics of the UWB pulses satisfy Federal Communications Commission regulations, and the experimental results are consistent with the simulated results based on the laser's rate equations.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OL.35.001734 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A laser ultrasound emitter based on high-power diode laser in overdrive operation mode for biomedical imaging applications.
Ultrasonics
December 2024
Universidad Carlos III de Madrid, Avenida de la Universidad, 30, Leganes, Madrid, Spain.
The most common transducers used to generate ultrasound in medical applications are based on short electrical pulses applied to piezoelectric transducers and capacitive micromachined ultrasound transducers. However, piezoelectric transducers have a limited frequency bandwidth, defined by their physical thickness, and capacitive micromachined ultrasound transducers have poor transmission efficiency. The high frequency cutoff limits the spatial resolution of ultrasonic images.
View Article and Find Full Text PDFScalp-Implanted Ultra-Wideband Circularly Polarized MIMO Antenna for Biotelemetry Systems.
Sensors (Basel)
November 2024
The School of Electrical Engineering, Xinjiang University, Shengli Road 666#, Urumqi 830046, China.
This paper presents an innovative, compact, dual-element, implantable, ultra-wideband, circularly polarized multiple-input multiple-output (MIMO) antenna designed to operate within the 2.45 GHz industrial, scientific, and medical band, and both of its radiating units are circularly polarized antennas with polarization diversity. Specifically, antenna-1 exhibits left-handed circular polarization properties, while antenna-2 demonstrates right-handed circular polarization properties.
View Article and Find Full Text PDFValidating Ultra-Wideband Positioning System for Precision Cow Tracking in a Commercial Free-Stall Barn.
Animals (Basel)
November 2024
Department of Ethology, Institute of Animal Science, 104 00 Praha, Czech Republic.
UWB positioning systems offer innovative solutions for precision monitoring dairy cow behaviour and social dynamics, yet their performance in complex commercial barn environments requires thorough validation. This study evaluated the TrackLab 2.13 (Noldus) UWB system in a dairy barn housing 44-49 cows.
View Article and Find Full Text PDFGeneralized Filter Bank Orthogonal Frequency Division Multiplexing: Low-Complexity Waveform for Ultra-Wide Bandwidth and Flexible Services.
Entropy (Basel)
November 2024
State Key Laboratory of Advanced Rail Autonomous Operation, School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China.
Article Synopsis
- Terahertz (THz) communication is essential for 6G mobile networks, enabling ultra-high data rates through ultra-wide bandwidths.
- A new waveform called generalized filter bank orthogonal frequency division multiplexing (GFB-OFDM) is introduced to meet the bandwidth demands that current 5G technology fails to satisfy.
- GFB-OFDM offers benefits like smaller IFFT sizes, flexibility in subcarrier spacing, support for varying bandwidths with a fixed filter, and compatibility with existing detection methods used in CP-OFDM, showing superior performance in simulations.
Collective responses of flocking sheep (Ovis aries) to a herding dog (border collie).
Commun Biol
November 2024
Centre de Recherches sur la Cognition Animale, Centre de Biologie Intégrative, CNRS, Université de Toulouse - Paul Sabatier, Toulouse, France.
Group-living organisms commonly exhibit collective escape responses, yet how information flows among group members in these events remains an open question. Here, we study the collective responses of a sheep flock (Ovis aries) to a shepherd dog (border collie) in a driving task between two well-defined target points. We collected high-resolution spatiotemporal data from 14 sheep and the dog, using Ultra-Wide-Band tags attached to each individual.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!