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Hybrid multilevel-multiwavelength signaling scheme for optical data transmission
Physica Scripta. 2023. Vol. 98. No. 12. Article 125119.
We suggest an idea of data encoding scheme based on the switching from the ground state (GS) to excited state (ES) lasing in quantum dot (QD) lasers with increase in injection current. The groups of two bits are assigned to lasing spectra that comprise either one or both GS and/or ES lasing lines depending on injection current. We expect that the proposed encoding scheme can potentially combine some advantages of multilevel signaling and wavelength division multiplexing.
Publication based on the results of:
Kornbleuth M., Opher M., Drake J. F. et al., Astrophysical Journal 2026 Vol. 1004 No. 1 P. 1–18
The shape of the heliosphere, regarded as comet-like since the 1960s, has recently been the subject of intense debate in the last decade. There is disagreement as to whether the heliospheric tail extends to ∼10,000 au in a comet-like shape or if it is short (∼400 au) with a split. Energetic neutral atom (ENA) maps from ...
Added: June 3, 2026
Карцев А. И., Nishant T., Saswata G. et al., Journal of Materials Chemistry C 2026 Article -
Overheating remains a critical limitation in high-performance electronic and computing systems,
necessitating the development of efficient thermal management fluids. In this work, a magnetically
responsive hybrid ferrofluid was developed by incorporating two-dimensional hexagonal boron nitride
(2D-hBN) nanosheets into a Mn–Zn–ferrite-based ferrofluid. The hybrid system retains magnetic
responsiveness while leveraging the high in-plane thermal conductivity and chemical stability of 2D-hBN
nanosheets. ...
Added: June 2, 2026
Fortuna A. S., A.I. Kartsev, Gorshenkov M. V. et al., Journal of Alloys and Compounds 2026 Vol. 1070 Article 188711
The τ-phase in Mn-Al-Ga alloys is a promising candidate for rare-earth-free permanent magnets. This study re-veals that the τ(γ₂)-phase in rapidly quenched Mn55Al36Ga9 ribbons contains a high density of dislocations, which
form antiphase boundaries (APBs). Using transmission electron microscopy and density functional theory, we
demonstrate that Mn atoms at these APBs couple antiferromagnetically. This antiferromagnetic interaction is
identified ...
Added: June 2, 2026
Dikhtievskaya K., Argunov E., Карцев А. И. et al., The Journal of Physical Chemistry Letters 2026 Vol. 17 No. 17 P. 4999–5004
In this study we revealed the effect of scandium doping on the electronic and superconducting properties of the MgB2 compound. Calculations demonstrate that Sc substitutes for Mg atoms, acting as an electron donor. Mg substitution diminishes the density of states in the σ-band and attenuates the electron–phonon coupling, thereby elucidating the reduction in critical temperature. Simultaneously, ...
Added: June 2, 2026
Duran E. ., Pulgar A., Izquierdo R. et al., Physica Status Solidi (A) Applications and Materials 2026 Vol. 223 No. 7 Article e202500942
Ceramic superconductors exhibit remarkable properties, including zero electrical resistance and potent magnetic behavior, operating at temperatures as high as the boiling points of liquid nitrogen (77 K) and liquid hydrogen (20 K). These characteristics position them as key enablers for sustainable technologies spanning electric propulsion, lossless energy transmission, advanced medical imaging, and quantum computation. This review presents ...
Added: June 1, 2026
Borisov V., Danilov V., Электросвязь 2025 № 12 С. 73–84
Представлены результаты математического моделирования процесса полевой эмиссии из катода малых размеров – одного из основных физических процессов, обеспечивающих работы многих электронных устройств, в частности FED-дисплеев (устройства, работающие на принципе полевой эмиссии), кантилеверов и т.д. Дается краткий обзор текущих результатов в области исследования, обосновывается актуальность задачи, приводятся примеры наиболее вероятного использования результатов решения задачи. Обсуждаются физические ...
Added: May 29, 2026
Arutyunov K., JIANG1 Q., FANG J. et al., Science China Information Sciences 2026 Vol. 69 No. 6 P. 1–11
Resonators based on nanoelectromechanical systems (NEMS) using two-dimensional (2D) materials with high-quality factors and excellent electrical control are critical for tunable coherent phonon dynamics, resonant sensors and wireless communications. However, their performance is fundamentally limited by the lack of a unified framework governing energy dissipation mechanisms and their electrical tunability. Here, we synergistically modulate both ...
Added: May 28, 2026
Elesin L., Shilov A., Jana S. et al., Advanced Functional Materials 2026 P. 1–10
Thermoelectric materials, long explored for energy harvesting and thermal sensing, convert heat directly into electrical signals. Extending their application to the terahertz (THz) frequency range opens opportunities for low-noise, bias-free THz detection, yet conventional thermoelectrics lack the sensitivity required for practical devices. Thermoelectric coefficients can be strongly enhanced near van Hove singularities (VHS), though these ...
Added: May 28, 2026
Degtyarev A., Bakhurin S., Yudin N., DSPA 2026 P. 1–6
This paper investigates one possible solution to the problem of self-interference cancellation (SIC) arising in the design of in-band full-duplex (IBFD) communication systems. Self-interference cancellation is performed in the digital domain using multilayer nonlinear models adapted via gradient-based optimization. The presence of local minima and saddle points during the adaptation of multilayer models limits the ...
Added: May 26, 2026
Qian X., Deng Y., Lev N. Shchur et al., Physica A: Statistical Mechanics and its Applications 2026 Vol. 696 Article 131679
We perform a Monte Carlo analysis of the Ising model on many three-dimensional lattices. By means of finite-size scaling we obtain the critical points and determine the scaling dimensions. As expected, the critical exponents agree with the three-dimensional Ising universality class for all models. The irrelevant field, as revealed by the correction-to-scaling amplitudes, appears to ...
Added: May 24, 2026
Melentiev P. N., Калмыков А. С., Гритченко А. С. et al., Успехи физических наук 2024 Т. 194 № 11 С. 1130–1145
Представлен краткий обзор достигнутого уровня оптических методов детектирования единичных молекул в биомедицинских приложениях. Показано, что регистрация флуоресценции единичных молекул красителей, ковалентно связанных с антителами (биомолекулами), совместно с использованием современных методов нанофотоники может быть применена для решения различных задач в биологии и медицине: визуализации биомолекул, токсинов, вирусных частиц, определения ультранизких концентраций аналитов напрямую во взятой пробе, ...
Added: May 21, 2026
Antsiferov P.S., Stepanov L.V., Matiukhin N. D., Review of Scientific Instruments 2025 Vol. 96 No. 12 Article 123506
The article presents the discharge plasma based source of extreme ultraviolet (EUV) radiation. The discharge circuit has been driven by means of stripe line storage with working voltage 10.5 kV. The main feature of the proposed source is that plasma electrons acquire the energy, necessary for the production of multiply charged ions with ionization potentials ...
Added: May 20, 2026
Petrovanov I., Sergeev A., / Series Computer Science "arxiv.org". 2025. No. 2512.18332.
Transport coding reduces message delay in packet-switched networks by introducing controlled redundancy at the transport layer: original packets are encoded into coded packets, and the message is reconstructed after the first successful deliveries, effectively shifting latency from the maximum packet delay to the -th order statistic. We present a concise, reproducible discrete-event implementation of transport coding in OMNeT++, including ...
Added: December 24, 2025
Kryzhanovskaya N., Moiseev E., Nadtochiy A. et al., , in: 2024 Asia Communications and Photonics Conference (ACP) and International Conference on Information Photonics and Optical Communications (IPOC).: IEEE, 2024. P. 1–4.
Semiconductor microdisk lasers developed using III-V epitaxial materials are widely studied during the last decade due to the bright prospectives coming from high quality circular cavity. The threshold and spectral characteristics of microlasers have been studied in sufficient detail, but the issue of the output power of such lasers has not been addressed, just as ...
Added: January 13, 2025
A. A. Karaborchev, I. S. Makhov, Shandyba N. A. et al., Journal of Physics D: Applied Physics 2024 Vol. 57 No. 28 Article 285104
In this papaer, the emission characteristics of InAs/InGaAs quantum dot (QD) microdisk lasers, of different cavity diameters, with a top split electrical contact formed using the focused ion beam technique are investigated. The dependences of the threshold currents of two-state lasing (i.e. currents corresponding to the start of the ground- and excited-state lasing) for microdisks ...
Added: August 26, 2024
Zhukov A., Nadtochiy A., Alexey Karaborchev et al., Optics Letters 2024 Vol. 49 No. 2 P. 330–333
A quantum-dot microdisk was optically pumped by continuous-wave excitation with a level sufficient for the ground-state lasing. The microdisk was additionally illuminated with sub-ps pulses of various powers. It was found that there is a critical level of pulse power that determines the subsequent transient process of the microlaser. Depending on the level of the ...
Added: February 5, 2024
A. A. Karaborchev, I. S. Makhov, M. V. Maximov et al., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2023 Vol. 16 No. 1.3 P. 157–162
The paper reports on the implementation of two-level lasing in injection microlasers with self-organized InAs/GaAs quantum dots. Emission bands related to the radiative electron-hole recombination involving ground and several excited states of quantum dots are observed in the spontaneous electroluminescence spectra. We investigated two-level lasing via the ground and first excited states of quantum dots ...
Added: July 3, 2023
Makhov I., Ivanov K., Moiseev E. et al., Optics Letters 2023 Vol. 48 No. 13 P. 3515–3518
The peculiarities of two-state lasing in a racetrack microlaser
with an InAs/GaAs quantum dot active region are
investigated by measuring the electroluminescence spectra
at various injection currents and temperatures. Unlike
edge-emitting and microdisk lasers, where two-state lasing
involves the ground and first excited-state optical transitions
of quantum dots, in racetrack microlasers, we observe lasing
through the ground and second excited states. As ...
Added: June 27, 2023
Максимов М. В., Шерняков Ю. М., Гордеев Н. Ю. et al., Письма в Журнал технической физики 2023 Т. 49 № 5 С. 18–21
We propose an approach for encoding and transmitting information based on the use of a quantum dot laser, which, depending on the injection current, emits either one of two or simultaneously two spectral components, with different wavelengths. When the laser is modulated by current, each lasing line is detected by an independent photodiode, and thus ...
Added: June 27, 2023
Makhov I., Ivanov K., Moiseev E. et al., Nanomaterials 2023 Vol. 13 No. 5 Article 877
One-state and two-state lasing is investigated experimentally and through numerical simulation
as a function of temperature in microdisk lasers with Stranski–Krastanow InAs/InGaAs/GaAs
quantum dots. Near room temperature, the temperature-induced increment of the ground-state
threshold current density is relatively weak and can be described by a characteristic temperature
of about 150 K. At elevated temperatures, a faster (super-exponential) increase in ...
Added: April 25, 2023
Makhov I., Ivanov K., Moiseev E. et al., Photonics 2023 Vol. 10 No. 3 Article 235
The two-state lasing phenomenon, which manifests itself in simultaneous laser emission
through several optical transitions of quantum dots, is studied in microdisk diode lasers with
different cavity diameters. The active region represents a multiply stacked array of self-organized
InAs/InGaAs/GaAs quantum dots emitting in the wavelength range of 1.1–1.3 um. Two-state
lasing, which involves the ground-state and the first excited-state ...
Added: April 25, 2023
Makhov I., Бекман А. А., Кулагина М. М. et al., Письма в Журнал технической физики 2022 Т. 48 № 12 С. 40–43
В широком диапазоне инжекционных токов исследованы спектральные зависимости интенсивности электролюминесценции микродискового лазера диаметром 31 μm с активной областью на основе квантовых точек InAs/InGaAs, работающего в непрерывном режиме генерации. Впервые в инжекционном микродисковом лазере продемонстрирована генерация одновременно через основное и возбужденное состояния квантовых точек при высоких уровнях накачки. При слабых уровнях накачки лазерная генерация протекает через ...
Added: July 5, 2022
Kryzhanovskaya N., Moiseev E., Zubov F. et al., Electronics Letters 2015 Vol. 51 No. 17 P. 1354–1355
A 31 μm in diameter microdisk laser with an InAs/InGaAs quantum dot active region has been tested in the continuous-wave regime at elevated temperatures. Lasing is achieved up to 100°C with a threshold current of 13.8 mA. The emission spectrum demonstrates single-mode lasing at 1304 nm with a side mode suppression ratio of 24 dB ...
Added: October 1, 2020
Zubov F., Maximov M., Kryzhanovskaya N. et al., Optics Letters 2019 Vol. 44 No. 22 P. 5442–5445
We report on direct large signal modulation and the reliability studies of microdisk lasers based on InGaAs/GaAs quantum well-dots. A 23 μm in diameter microlaser exhibits an open eye diagram up to 12.5 Gbit/s and is capable of error-free 10 Gbit/s data transmission at 30°C without temperature stabilization. The ageing tests of a 31 μm ...
Added: September 30, 2020