Results 121 to 130 of about 1,504,963 (315)
Adaptive Demodulation in Differentially Coherent Phase Systems: Design and Performance Analysis
, 2010 Adaptive Demodulation (ADM) is a newly proposed rate-adaptive system which operates without requiring Channel State Information (CSI) at the transmitter (unlike adaptive modulation) by using adaptive decision region boundaries at the receiver and ...
Abouei, Jamshid +3 more
core +1 more source
Non-Coherent UWB Communications
Frequenz, 2009 Early UWB concepts for communications have almost exclusively relied on impulse radio, where the whole available bandwidth, i.e., up to 7.5 GHz, is covered at once by means of very short pulses which are generated with a low duty cycle. Meanwhile, a bandwidth of 7.5 GHz is only available in the US [1, 3]. In Europe, the spectrum which is available with
Song, Nuan, Wolf, Mike, Haardt, Martin
openaire +3 more sources
Infrared Colloidal Quantum Dot Edge Emitting Lasers Integrated on Silicon
Advanced Optical Materials, EarlyView.In this work, the first monolithic integration of Pb‐chalcogenide CQDs in an edge‐emitting DFB laser cavity onto a Si/SiO2 substrate has been demonstrated. The optimizations of SiO2 layer thickness, engineering of the grating duty cycle, and implementing λ/4 phase shift resulted in the achievement of spectrally pure, single‐mode lasing at 1650 nm with ...
Hamed Dehghanpour Baruj +5 more
wiley +1 more source
Incorporating Si into Sb2Se3: Tailoring Optical Phase Change Materials via Nanocomposites
Advanced Optical Materials, EarlyView.We study the structural, optical, and thermal effects of adding silicon to Sb2Se3 and demonstrate that the as‐deposited solid solution phase segregates after electro‐thermal switching, creating a nanocomposite with effective‐medium properties and a phase‐change response.
Chih‐Yu Lee +12 more
wiley +1 more source
A new coherent demodulation technique for land-mobile satellite communications [PDF]
An advanced coherent demodulation technique is described for land mobile satellite (LMS) communications. The proposed technique features a combined narrow/wind band dual open loop carrier phase estimator, which is effectively able to compensate the fast ...
Tomita, Hideho, Yoshida, Shousei
core +1 more source
Thickness Dependence of Linear and Nonlinear Optical Properties of Multilayer 3R‐MoS2
Advanced Optical Materials, EarlyView.Thickness as a key design parameter for optimizing the nonlinear optical response of layered transition metal dichalcogenides (TMDs) materials is established. The demonstrated correlation between thickness, linear spectra, and harmonic generation efficiency provides a powerful framework for tailoring nonlinear performance.
Fatemeh Abtahi +6 more
wiley +1 more source
Advanced Optical Materials, EarlyView.This work investigates the impact of platinum thin films on shallow nitrogen‐vacancy (NV) centers in diamond for quantum sensing applications. Five samples are analyzed with varying nitrogen implantation energies (2.5–60 keV) and changes in optical properties, charge state, and coherence times are reported.
Joachim P. Leibold +8 more
wiley +1 more source
Tendencias actuales y perspectivas de las comunicaciones ópticas [PDF]
, 1988 A short review to the main problems today in optical Communications is given. Several topics, namely, coherent optical systems, high-speed transmission systems, optical switching, fluoride glasses and wavelength division multiplexing are studied.
Martín Pereda, José Antonio
core +1 more source
Electroluminescence and Franz–Keldysh Modulation Observed in Sn/Ge Multi‐Quantum Wells
Advanced Optical Materials, EarlyView.We investigate the optoelectronic properties of PIN diodes based on ultrathin α‐Sn/Ge multiple quantum film structures, fabricated by molecular beam epitaxy, both experimentally and theoretically. The samples exhibit a light emission spectrum in the short‐wavelength infrared range with two transitions. Furthermore, when operating as a photodetector, we
Michael Oehme +9 more
wiley +1 more source
Non-Coherent Open-Loop MIMO Communications Over Temporally-Correlated Channels
IEEE Access, 2016 This paper investigates the use of non-coherent communication techniques for open-loop transmission over temporally-correlated Rayleigh-fading MIMO channels.
Jorge Cabrejas +6 more
doaj +1 more source