Results 71 to 80 of about 3,855,517 (228)

Non-Line-of-Sight Optical Camera Communication in a Heterogeneous Reflective Background

IEEE Photonics Journal, 2019
In the last few years, optical camera communication (OCC) has benefited from built-in CMOS image sensors in smart devices. OCC is now considered a candidate for incorporation into IEEE 802.15.7r1. A major study on OCC was conducted for line-of-sight (LOS)
Jenn-Kaie Lain, Fu-Cheng Jhan, Zheng-Dao Yang   +2 more
doaj   +1 more source

BPSK subcarrier intensity modulated free-space optical communications in atmospheric turbulence [PDF]

, 2009
Free-space optical communications (FSO) propagated over a clear atmosphere suffers from irradiance fluctuation caused by small but random atmospheric temperature fluctuations.
Ghassemlooy, Zabih, Popoola, Wasiu Oyewole, Popoola, Wasiu O., Ghassemlooy , Zabih   +3 more
core   +1 more source

Photoluminescent Color Centers on a Mainstream Silicon Photonic Foundry Platform

Advanced Optical Materials, EarlyView.
Silicon photonic chips route and process light efficiently but are inherently inefficient at generating it. Here, bright light‐emitting defects, W‐centers, are written into the silicon layer of finished chips from a mainstream commercial foundry: high‐energy ions are implanted straight through the protective oxide and activated by a 250∘C$^\circ{\rm C}$
Prosper Dellah Allo, A. Aadhi, Amirhossein Mosaddegh Yengejeh, Hazel Bakajsza, Mirabel N. M. Mensah, Marcus Tamura, Bhavin J. Shastri, Alexander N. Tait   +7 more
wiley   +1 more source

Underwater optical wireless communications : depth dependent variations in attenuation [PDF]

, 2013
Depth variations in the attenuation coefficient for light in the ocean were calculated using a one-parameter model based on the chlorophyll-a concentration Cc and experimentally-determined Gaussian chlorophyll-depth profiles.
Leeson, Mark S., Green, Roger, Johnson, Laura J.   +2 more
core   +1 more source

Coherent Absorption Reveals Colors Hidden in a Grey Fabry–Pérot Cavity

Advanced Optical Materials, EarlyView.
A dielectric thin film shows colors depending on its thickness; this effect can be used to encode information normally accessible through single‐beam spectroscopy. We developed a method to conceal this kind of information, based on coating the dielectric with a matched conductor, that suppresses the color‐bearing thin‐film resonances.
Giuseppe E. Lio, Giulio Carotta, Lorenzo Lavista, Andrea Camposeo, Giacomo Venturi, Agnese Guernieri, Alessandro Pitanti, Simon A. R. Horsley, Giuseppe C. La Rocca, Alessandro Tredicucci, Simone Zanotto   +10 more
wiley   +1 more source

Design and Implementation of a Novel Compatible Encoding Scheme in the Time Domain for Image Sensor Communication

Sensors, 2016
This paper presents a modulation scheme in the time domain based on On-Off-Keying and proposes various compatible supports for different types of image sensors. The content of this article is a sub-proposal to the IEEE 802.15.7r1 Task Group (TG7r1) aimed
Trang Nguyen, Mohammad Arif Hossain, Yeong Min Jang   +2 more
doaj   +1 more source

Wavelength-diversity transmission for fading mitigation in the atmospheric optical communication channel [PDF]

, 2006
Mitigation of index of refraction turbulence (IRT) effects is crucial in long-range atmospheric communication links. Diversity-transmission is one favorable way for fading compensation.
Perlot, Nicolas, Hennes Henniger, Giggenbach, Dirk, Nicolas Perlot, Brandon L. Wilkerson, Henniger, Hennes, Wilkerson, Brandon, Dirk Giggenbach   +7 more
core   +1 more source

Donor‐Strength‐Driven Evolution From Charge‐Transfer to Polymethine Excited States in CurcBF2 Derivatives

Advanced Optical Materials, EarlyView.
Donor strength governs the excited‐state character and TADF behavior of donor‐acceptor‐donor borondifluoride curcuminoid derivatives. Increasing donor strength drives a transition from charge‐transfer TADF to a zwitterionic polymethine structure with predominantly local excited‐state emission and suppressed TADF.
Anthony D'Aléo, Guillaume Michaluszko, Amandine Coron, Dae‐Hyeon Kim, Alban de Gary, Danillo Valverde, Elena Zaborova, Emilie Couzigné, Lorry Engel, Loïc Mager, Gabriel Canard, Chihaya Adachi, Yoann Olivier, Jean‐Charles Ribierre   +13 more
wiley   +1 more source

Indoor gigabit optical wireless communications: challenges and possibilities [PDF]

, 2010
Indoor Gigabit optical wireless communication systems have the potential to offer multiple high-speed data services that can be delivered to homes via an optical fibre cable in the near future. In this paper we will discuss the challenges involved in the
Ghassemlooy, Zabih, Dominic O'Brien, Grahame Faulkner, Ghassemlooy, Z, Faulkner, G, O'Brien, Dominic, Faulkner, Grahame, Le Minh, H, Zabih Ghassemlooy, Le Minh, Hoa, O'Brien, D, Hoa Le Minh   +11 more
core   +1 more source

Improving the Robustness of Visual Teach‐and‐Repeat Navigation Using Drift Error Correction and Event‐Based Vision for Low‐Light Environments

Advanced Robotics Research, EarlyView.
Visual teach‐and‐repeat (VTR) navigation allows robots to learn and follow routes without building a full metric map. We show that navigation accuracy for VTR can be improved by integrating a topological map with error‐drift correction based on stereo vision.
Fuhai Ling, Ze Huang, Tony J. Prescott
wiley   +1 more source