In this Letter, we propose and demonstrate a novel wireless communications link using an illuminating optical fiber as a transmitter (Tx) in optical camera communications. We demonstrate an indoor proof-of-concept system using an illuminating plastic optical fiber coupled with a light-emitting diode and a commercial camera as the Tx and the receiver, respectively. For the first time, to the best of our knowledge, we experimentally demonstrate flicker-free wireless transmission within the off-axis camera rotation angle range of 0-45° and the modulation frequencies of 300 and 500 Hz. We also show that a reception success rate of 100% is achieved for the camera exposure and gain of 200 µs and 25 dB, respectively.
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http://dx.doi.org/10.1364/OL.428077 | DOI Listing |
Sci Rep
December 2024
College of Computer Science, Chengdu University, Chengdu, 610106, China.
This study offers a comprehensive analysis of the Perturbed Schrödinger -Hirota Equation (PSHE), crucial for understanding soliton dynamics in modern optical communication systems. We extended the traditional Nonlinear Schrödinger Equation (NLSE) to include higher-order nonlinearities and spatiotemporal dispersion, capturing the complexities of light pulse propagation. Employing the modified auxiliary equation method and Adomian Decomposition Method (ADM), we derived a spectrum of exact traveling wave solutions, encompassing exponential, rational, trigonometric, and hyperbolic functions.
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December 2024
Bascom Palmer Eye Institute, University of Miami, 900 NW 17th St, Miami, FL, USA.
This study assessed the impact of race and ethnicity on longitudinal test variability and time to detect glaucoma progression using standard automated perimetry (SAP) and optical coherence tomography (OCT). The sample consisted of 47,003 SAP tests from 5402 eyes and 25,480 OCT tests from 4125 eyes, with 20% of participants self-identifying as Black or African American and 80% as White; 29% as Hispanic or Latino and 71% as Not Hispanic or Latino. Variability was measured using standard deviations of residuals from linear regression models for SAP mean deviation (MD) and OCT retinal nerve fiber layer (RNFL) thickness over time.
View Article and Find Full Text PDFIndian J Ophthalmol
December 2024
VST Centre for Glaucoma Care, L V Prasad Eye Institute, Kallam Anji Reddy Campus, Hyderabad, Telangana, India.
Purpose: To compare the retinal nerve fiber layer (RNFL), ganglion cell-inner plexiform layer thickness, central subfield thickness (CSFT), and parafoveal and perifoveal thickness in children of different age groups with young adult controls by using spectral-domain optical coherence tomography.
Methods: This cross-sectional study included children aged 6-17 years and adult controls (18-22 years) - group 1: 6-9 years (57 eyes), group 2: 10-13 years (116 eyes), group 3: 14-17 years (66 eyes), and group 4 (controls): 18-22 years (61 eyes). A mixed-effects model was used to compare the OCT parameters among the groups, along with multivariable analysis.
Biosensors (Basel)
December 2024
Guangdong Laboratory of Artificial Intelligence and Digital Economy (SZ), Shenzhen 518107, China.
The demand for non-invasive, real-time health monitoring has driven advancements in wearable sensors for tracking biomarkers in sweat. Ammonium ions (NH) in sweat serve as indicators of metabolic function, muscle fatigue, and kidney health. Although current ion-selective all-solid-state printed sensors based on nanocomposites typically exhibit good sensitivity (~50 mV/log [NH]), low detection limits (LOD ranging from 10 to 10 M), and wide linearity ranges (from 10 to 10 M), few have reported the stability test results necessary for their integration into commercial products for future practical applications.
View Article and Find Full Text PDFBiosensors (Basel)
December 2024
Zhejiang University-University of Illinois Urbana-Champaign Institute, Zhejiang University, Haining 314400, China.
Smartphones equipped with highly integrated sensors are increasingly being recognized as powerful tools for rapid on-site testing. Here, we propose a low-cost, portable, and highly multiplexed smartphone-based spectrometer capable of collecting three types of spectra-transmission, reflection, and fluorescence-by simply replacing the optical fiber attached to the housing. Spectral analysis is performed directly on the smartphone using a custom-developed app.
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