Article
Optics
Khalil Safari-Anzabi, Amir Habibzadeh-Sharif, Michael J. Connelly, Ali Rostami
Summary: The study investigates the feasibility and performance improvement of an All-Optical XOR gate for high-speed data transmission using Quantum Dot-based RSOAs. It shows that utilizing QD-RSOA can significantly reduce gain recovery time and achieve higher output quality and lower power consumption at 320 Gb/s data rates.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Farshad Serat Nahaei, Ali Rostami, Hamit Mirtagioglu, Amir Maghoul, Ingve Simonsen
Summary: A comprehensive study has been conducted on ultra-broadband optically pumped quantum dot (QD) reflective semiconductor optical amplifiers (QD-RSOAs). The suggested device supports about 1 μm optical bandwidth, spanning 800 nm up to 1800 nm, by superimposing nine groups of QDs. It has been shown that the device can be engineered to amplify a selected window or a group of desired windows. Moreover, the operation of the device has been thoroughly investigated by solving the coupled differential rate and signal propagation equations, with a numerical algorithm suggested to solve these equations. As far as we are concerned, a broadband optically pumped QD-RSOA that can operate as a filter has been introduced.
Article
Engineering, Electrical & Electronic
Yuqian Wang, Wei Ji, Hailong Wang, Weiping Huang
Summary: An all-optical half adder has been achieved by utilizing the gain nonlinearity characteristics of quantum-dot semiconductor optical amplifier. This design is simpler and more compact compared to interferometer-based designs, and can fulfill the system's splitting requirements. The Q factor can be improved through parameter optimization.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Farshad Serat Nahaei, Ali Rostami, Peyman Mirtaheri
Summary: A comprehensive study has been conducted comparing quantum dot reflective semiconductor optical amplifiers (QD-RSOAs) with optical pumps (OPs) and electrical pumps (EPs). It is found that the OP version of the device has better dynamic properties. The operation of the device in pulse mode is investigated by solving the coupled differential rate and signal propagation equations. The results demonstrate that OP QD-RSOAs can significantly outperform EP QD-RSOAs in applications such as fast all-optical signal processing and wavelength division multiplexing in passive optical networks.
Article
Optics
Boris Nyushkov, Aleksey Ivanenko, Sergey Smirnov
Summary: This study demonstrates the possibility of accurately synthesizing high-energy arbitrary optical waveforms using direct laser synthesis with programmable driving of partial cavity dumping. By integrating two different active media, the laser setup achieves the synthesis of nanosecond arbitrary optical waveforms with tunable repetition rate and high energy.
LASER PHYSICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Alexey M. Nadtochiy, Nikita Yu Gordeev, Anton A. Kharchenko, Sergey A. Mintairov, Nikolay A. Kalyuzhnyy, Yury S. Berdnikov, Yuriy M. Shernyakov, Mikhail Maximov, Alexey E. Zhukov
Summary: The modal absorptions in laser-like heterostructures containing InAs self-assembled quantum dots (QDs) and InGaAs quantum well-dots (QWDs) have been studied, with per-layer modal absorptions determined. The introduction of the layer gain constant allows for comparison of quantum heterostructures with different dimensionality, showing that the QWD layer gain constant significantly exceeds quantum well and quantum dot ones.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Nivedita Nair, Sanmukh Kaur, Hardeep Singh
Summary: This study presents the design and implementation of all-optical shift registers that can transfer input information bits in serial or parallel configuration based on clock signal transitions. Utilizing cross-coupled semiconductor optical amplifiers and an optical NOT gate, the shift registers were tested at an operational speed of 100 Gb/s, showing reduced complexity and footprint ideal for photonic integration.
Article
Quantum Science & Technology
Manish Kumar Mehta, Joseph Thomas Andrews, Pratima Sen
Summary: In this paper, a novel method is proposed to overcome the limitations of exciton and biexciton states only appearing at low temperatures, as well as the complexity of using lasers with different polarization states for CNOT operations. By utilizing ultrafast magnetic pulse CNOT gate operation in Mn-doped InSb quantum dots at room temperature, with only a circularly polarized laser pulse, the proposed method shows a significantly large fidelity calculation for CNOT gate.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
Dimitrios E. Fouskidis, Kyriakos E. Zoiros, Antonios Hatziefremidis
Summary: This paper theoretically investigates and demonstrates the feasibility of implementing multiple all-optical logic gates (AND, NOR, OR, NOT) at 160Gbs using a single quantum-dot semiconductor optical amplifier (QD-SOA) and concatenated optical filter. A systematic approach is used to derive rules for selecting critical operating parameters to ensure logically correct and high-quality outcomes for each gate. The proposed scheme can be easily reconfigured to realize different logic gates at 160Gbs without changing the basic setup or driving conditions.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Amer Kotb, Chunlei Guo
Summary: An ultrafast all-optical memory using Mach-Zehnder interferometers and symmetrical quantum-dot semiconductor optical amplifiers has been theoretically demonstrated to operate at 250 Gb/s for 500 loop circulations, with high quality factor.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Optics
Angel Valle
Summary: This study theoretically analyzes the statistics of the optical phase of light emitted by a semiconductor laser diode under periodic modulation of the applied bias current. Numerical simulations show that the phase is not distributed as a Gaussian during the initial stages of evolution. It is demonstrated that, under typical gain-switching with square-wave modulation for quantum random number generation, the system loses memory of the distribution of initial conditions in the nanosecond time scale.
Article
Engineering, Electrical & Electronic
Xinliang Zhang, Tong Cao, Wenchan Dong
Summary: Quantum-well semiconductor optical amplifiers (QW-SOAs) are widely used in all-optical signal processing due to their diverse nonlinear effects. The performance requirements for QW-SOAs vary for different optical signal processing functions, and therefore the nonlinear effects of the QW-SOAs should be selectively controlled. A comprehensive QW-SOA model, integrating the QW band structure calculation with a dynamic model, is established to establish a connection between the structure parameters and the nonlinear effects of QW-SOA. Different structure parameters are calculated using characterized parameters of the QW-SOAs, such as gain coefficient, differential gain coefficient, refractive index change, differential refractive index change, linewidth enhancement factor, third-order susceptibility, and polarization dependent gain. These calculations guide the optimization of structure parameters for engineering the nonlinear effects and achieving the best performance output, as exemplified by wavelength conversion based on cross gain modulation and four wave mixing. This theoretical work provides guidance for choosing optimized structure parameters when fabricating QW-SOAs for different optical signal processing functions.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Ahmed H. Flayyih, Firas S. Mohammed, Amin H. Al-Khursan
Summary: Carrier temperature in InAs quantum dot optical amplifiers has been theoretically formalized using the double-excited states system. High current injection results in high carrier temperature, and increasing carrier-heating time further increases the carrier temperature. Slow relaxation processes contribute to high carrier temperature in the system.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2021)
Article
Physics, Applied
Kouichi Akahane, Atsushi Matsumoto, Toshimasa Umezawa, Naokatsu Yamamoto, Yuki Yata, Hideyuki Sotobayashi, Makoto Naruse, Atsushi Kanno
Summary: Random signal generation in a ring resonator laser is achieved with quantum-dot semiconductor optical amplifiers, where the individual longitudinal modes act as the channels for random number generation.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Juan Arturo Alanis, Joshua Robertson, Matej Hejda, Antonio Hurtado
Summary: This paper presents a high-speed and tunable photonic synaptic element based on VCSOA, allowing full weight tunability of sub-ns input light pulses by varying the bias current. The VCSOA-based synapse offers gain and dynamical weight tuning at high-speed with up to 11.6-bit precision, making it a promising solution for future neuromorphic photonic systems.
APPLIED PHYSICS LETTERS
(2021)
Review
Physics, Applied
Si-Cong Tian, Mansoor Ahamedt, Gunter Larischt, Dieter Bimbergt
Summary: This article summarizes the current state of high-speed VCSEL designs and presents several novel approaches for improving their performance. These designs have the potential to enhance energy efficiency and bandwidth.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Raphael Schwanninger, Stefan M. Koepfli, Olesya Yarema, Alexander Dorodnyy, Maksym Yarema, Annina Moser, Shadi Nashashibi, Yuriy Fedoryshyn, Vanessa Wood, Juerg Leuthold
Summary: We demonstrate compact and efficient photodetectors operating at room temperature in a wavelength range of 2710-4250 nm with high responsivities of 375 and 4 A/W. The key to their high performance is the combination of a sintered colloidal quantum dot (CQD) heterojunction photoconductor and a metallic metasurface perfect absorber. The combination results in a 20-fold increase in responsivity compared to reference photoconductors.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
Jan Aeschlimann, Fabian Ducry, Christoph Weilenmann, Juerg Leuthold, Alexandros Emboras, Mathieu Luisier
Summary: We present a multiscale simulation framework for metal-oxide-metal structures in conductive bridging random-access memory (CBRAM). The framework utilizes a finite-element model with input parameters extracted from ab initio or machine-learned empirical calculations. The model includes techniques such as molecular dynamics, nudged elastic band, electronic transport, and thermal quantum transport. Experimental data of an Ag/a-SiO2/Pt CBRAM is well reproduced using this framework. Joule heating is found to be significant in devices with thin conductive filaments and current concentrations in the tens-microampere range.
PHYSICAL REVIEW APPLIED
(2023)
Article
Nanoscience & Nanotechnology
Miklos Csontos, Yannik Horst, Nadia Jimenez Olalla, Ueli Koch, Ivan Shorubalko, Andras Halbritter, Juerg Leuthold
Summary: The resistance state of filamentary memristors can be adjusted by relocating a few atoms in the active region of the conducting filament. The technology shows promise in downsizing, energy efficiency, and speed. However, the mechanisms and limitations of ultra-fast resistive switching need to be clarified for high-frequency applications. In this study, bipolar, multilevel resistive switchings were investigated in tantalum pentoxide based memristors with picosecond time resolution.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Larry R. Dalton, Juerg Leuthold, Bruce H. Robinson, Christian Haffner, Delwin L. Elder, Lewis E. Johnson, Scott R. Hammond, Wolfgang Heni, Claudia Hosessbacher, Benedikt Baeuerle, Eva De Leo, Ueli Koch, Patrick Habegger, Yuriy Fedoryshyn, David Moor, Ping Ma
Summary: The growth of integrated photonics has led to the demand for efficient electrical-to-optical signal conversion and photodetection over a wide range of frequencies. Nanophotonic devices with small feature sizes enable high-performance materials to be utilized to their maximum potential. Hybrid organic/semiconductor nanophotonic integration has improved understanding of material properties and provided stable alternatives to traditional thermoplastic EO polymers. The interrelationship between hybrid device architectures and materials needs to be considered for further advancements.
Review
Optics
Andrey Babichev, Sergey Blokhin, Evgenii Kolodeznyi, Leonid Karachinsky, Innokenty Novikov, Anton Egorov, Si-Cong Tian, Dieter Bimberg
Summary: Single-mode long-wavelength vertical-cavity surface-emitting lasers (VCSELs) are a cost-effective alternative to DFB-lasers for data communication in next-generation giga data centers. Spatial division multiplexing transmission through multicore fibers using these lasers allows for larger-scale data center networks. Achieving high-speed modulation is discussed in this review, including the state-of-the-art technology and the use of hybrid short-cavity concept and wafer-fusion concepts.
Article
Optics
Andrey Babichev, Sergey Blokhin, Andrey Gladyshev, Leonid Karachinsky, Innokenty Novikov, Alexey Blokhin, Mikhail Bobrov, Yakov Kovach, Alexander Kuzmenkov, Vladimir Nevedomsky, Nikolay Maleev, Evgenii Kolodeznyi, Kirill Voropaev, Alexey Vasilyev, Victor Ustinov, Anton Egorov, Saiyi Han, Si-Cong Tian, Dieter Bimberg
Summary: A detailed experimental analysis on the impact of device topology on the performance of 1550 nm VCSELs is presented. The high-speed performance of the lasers with L-type device topology is mainly limited by electrical parasitics, while the S-type device topology allows for higher parasitic cutoff frequency and demonstrates more than 13 GHz modulation bandwidth and up to 37 Gbps data transmission under back-to-back conditions at 20°C.
Article
Engineering, Electrical & Electronic
Hande Ibili, Tobias Blatter, Michael Baumann, Laurenz Kulmer, Boris Vukovic, Jasmin Smajic, Juerg Leuthold
Summary: This article introduces a theory and equivalent circuit models for designing and optimizing plasmonic modulator antennas. The proposed models aim to improve the understanding of the powerful antenna field enhancement and provide optimized antenna structures and parameters.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Michal Maciejewski, Bernhard Auchmann, Douglas Martins Araujo, Giorgio Vallone, Juerg Leuthold, Jasmin Smajic
Summary: This paper presents a methodology for collaborative modeling based on model-based systems engineering. The methodology consists of three pillars: encapsulated computing environments with service query interface, model notebooks with auto-generated model views, and model query interface with results caching. The methodology aims to achieve decentralized multi-model and multi-scale collaboration while maintaining traceability and reproducibility. It is demonstrated with a multi-model coil design optimization of a high-field superconducting magnet.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Review
Optics
Alexander Dorodnyy, Jasmin Smajic, Juerg Leuthold
Summary: Mie scattering is used to manipulate electromagnetic fields for various applications such as strong resonant enhancement, perfect absorption of radiation, and polarization/wavelength selectivity. Recent applications include light spectrum control, detection, non-linear effects enhancement, and emission. It is also demonstrated that a periodic arrangement of Mie scatterers can lead to a significant absorption enhancement in weakly absorbing layers.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Ulle-Linda Talts, Helena C. Weigand, Gregoire Saerens, Peter Benedek, Joel Winiger, Vanessa Wood, Jurg Leuthold, Viola Vogler-Neuling, Rachel Grange
Summary: Researchers demonstrate a nanoimprinted nonlinear barium titanate 2D nanohole array that exhibits optical properties of a 2D photonic crystal and a metasurface. The structure is achieved through soft nanoimprint lithography, with enhanced second-harmonic generation by a factor of 18, showcasing the potential of this technique in flexible fabrication of barium titanate photonic devices.
Proceedings Paper
Engineering, Electrical & Electronic
Jonas Krimmer, Lennart Schmitz, Wolfgang Freude, Christian Koos, Sebastian Randel
Summary: Using a few-mode fiber instead of a single-mode fiber significantly reduces link downtimes.
2022 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2022)
Proceedings Paper
Optics
Daniel Drayss, Dengyang Fango, Christoph Fuellner, Artem Kuzmin, Wolfgang Freude, Sebastian Randel, Christian Koos
Summary: We have developed a slice-less optical-arbitrary-waveform-measurement (OAWM) front-end integrated on a silicon photonic chip and demonstrated its viability by receiving high-speed data signals (100 GBd 64 QAM). Our system covers a bandwidth of more than 160 GHz and utilizes accurate calibration for high-fidelity signal reconstruction.
2022 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)
(2022)
Proceedings Paper
Optics
C. Eschenbaum, A. Mertens, C. Fuellner, A. Kuzmin, A. Schwarzenberger, A. Kotz, G. Ramann, M. Chen, J. Drisko, B. Johnson, J. Zyskind, J. Marcelli, M. Lebby, W. Freude, S. Render, C. Koos
Summary: We demonstrate a silicon-organic hybrid slot-waveguide modulator based on a temperature-stable organic electro-optic material. The device exhibits a low UπL product and enables high-speed transmission with low drive voltages.
2022 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)
(2022)
Proceedings Paper
Optics
Pascal Maier, Yung Chen, Yilin Xu, Matthias Blaicher, Dimitri Geskus, Ronald Dekker, Junqiu Liu, Philipp-Immanuel Dietrich, Huanfa Peng, Sebastian Randel, Wolfgang Freude, Tobias J. Kippenberg, Christian Koos
Summary: We present an InP/Si3N4 hybrid integrated ECL that utilizes 3D-printed coupling elements. The ECL demonstrates a tuning range of 90 nm, SMSR above 60 dB, and intrinsic linewidths of 979 Hz. It is also employed as a tunable pump laser for Kerr-comb generation.
2022 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)
(2022)
