Article
Optics
Mattias Verstuyft, Elias Akiki, Mathias Vanwolleghem, Guillaume Ducournau, Jean-Francois Lampin, Benjamin Walter, Fuanki Bavedila, Edouard Lebouvier, Marc Faucher, Bart Kuyken
Summary: Dielectric waveguides can confine and guide terahertz waves in sub-wavelength sized structures. In this study, a very short silicon 90 degrees-bend with an average loss of 0.14 dB per bend in the 600-750 GHz range is demonstrated.
Article
Engineering, Electrical & Electronic
Cuma Tyszkiewicz
Summary: The study focuses on the single mode condition of silica-titania rib waveguides on glass, presenting two mechanisms leading to single mode propagation of lightwaves. The complete single mode condition is expressed by two criterion functions, aiding in predicting a range of morphological parameters for single mode propagation.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Ranepura Hewage Neranjith, Yuya Shoji, Tetsuya Mizumoto
Summary: This paper extends previous work on a microring resonator-type serial-to-parallel conversion scheme for all-optical label processing on silicon photonic platform. By introducing rib waveguides, propagation loss is reduced to sub-dB/cm values, allowing for multibit conversion. Despite free-carrier dispersion in silicon, serial-to-parallel conversion was demonstrated on a 4-bit label, even at low pump power levels.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Shangsen Sun, Penghui Dong, Fengchun Zhang, Juanli Wang, Ning Zhu, Yaocheng Shi
Summary: This paper presents a method for designing compact multimode waveguide bends using the inverse design algorithm, which achieves high performance ultra-compact MWBs by changing the curvature radius of the waveguide curve with a simple fabrication process. The designed three-mode bent waveguide shows excellent performance in a wide spectral range.
LASER & PHOTONICS REVIEWS
(2021)
Article
Engineering, Electrical & Electronic
Tao Ma, Shaohui Liu, Yongsheng Tian, Heng Liu, Fang Wang
Summary: A graphene-hBN-silicon hybrid plasmonic rib waveguide is designed for refractive index sensing, achieving a high FOM value by optimizing size parameters and showing remarkable propagation performance peaks. The sensing structure demonstrates good sensitivity for homogeneous and surface sensing, making it suitable for ultra-compact on-chip micro-nano photonic biochemical sensing systems.
IEEE SENSORS JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Moran Bin Nun, Yedidya Lior, Dan M. Marom
Summary: In this work, the fabrication and characterization of PFCB waveguides optimized for Kerr nonlinearity enhancement for integrated optics are reported. These waveguides exhibit a relatively high Kerr coefficient in the telecom wavelength range.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Optics
Amit Vishnoi, Rina Mudi, Kapil Debnath
Summary: The lack of a systematic design strategy has hindered the development of three-dimensional photonic crystals. However, this study demonstrates a new design methodology for manipulating photons in three dimensions, achieving 90-degree waveguide bends with near zero dB bending loss.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Optics
Kamanashis Goswami, Haraprasad Mondal, Mrinal Sen
Summary: This study optimizes the bending configurations of Photonic Crystal (PhC) Waveguides (PhCWs) to reduce losses. By optimizing the diameter of defect holes, high transmittance is achieved. The optimized PhCWs show good performance for different bending angles and have tolerance to fabrication imperfections.
Article
Optics
Mingyang Ma, Mingrui Yuan, Xudong Zhou, Huifu Xiao, Pengfei Cao, Lin Cheng, Thach Giang Nguyen, Andreas Boes, Guanghui Ren, Yikai Su, Arnan Mitchell, Yonghui Tian
Summary: Lithium niobate on insulator (LNOI) is a promising platform for high-performance photonic integrated circuits (PICs) in communication applications. Multimode waveguide bends with double air grooves are proposed and demonstrated to achieve low crosstalk for three different transverse electric (TE) modes in the wavelength range of 1525-1575 nm. The demonstrated device provides a compact solution for multimode waveguide bends, paving the way for high-speed, high-data-capacity PICs in on-chip communication systems.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Yao Zhao, Yang Chen, Zhi-Shan Hou, Bing Han, Hua Fan, Lin-Han Lin, Xi-Feng Ren, Hong-Bo Sun
Summary: This study investigates the propagation of polarization-dependent Bloch oscillations and demonstrates the polarization-dependent Bloch period using a polymer-based gradient waveguide array. The results provide a new paradigm for two-dimensional optical Bloch modes and highlight the influence of optical polarization in the same system, enabling the observation of richer physics related to Bloch oscillations.
Article
Engineering, Electrical & Electronic
Menghui He, Jiafu Zeng, Zhangxiong Chen, Xian Zhang, Xiaosong Zhu, Chengbin Jing, Chao Chang, Yiwei Shi
Summary: This article investigates and fabricates a flexible metallic polarization-maintaining (PM) hollow waveguide for transmitting linearly polarized terahertz (THz) radiation and flexible imaging. The waveguide achieves high birefringence and polarization maintenance, leading to high-resolution imaging.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Yusra Mahmood Obeidat, Kevin L. Lear
Summary: The paper presents a model to calculate scattering losses in optical waveguides containing porous silica materials, with simulation results closely matching experimental data. The model considers factors affecting both surface and volume scattering losses, demonstrating good agreement with experimental results. The models can be used for calculating scattering losses in optical waveguides with porous silica claddings.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Aref Rasoulzadeh Zali, Steven Kleijn, Luc Augustin, Netsanet M. Tessema, Kristif Prifti, Ripalta Stabile, Nicola Calabretta
Summary: In this work, a low polarization-dependent SOA co-integrated with passive waveguides is designed, simulated, fabricated and characterized, showing potential applications in photonic integrated circuits. The simulation results are in good agreement with the experimental results, validating the feasibility of the design.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Po-Han Fu, Chen-Yu Chao, Ding-Wei Huang
Summary: The study divided the trajectory of a 90 degrees bend into two symmetric halves and optimized parameters using a particle swarm optimization algorithm to maximize waveguide transmission. The optimized bends showed low bending loss and were fabrication tolerant with less wavelength-dependent compared to circular bends.
IEEE PHOTONICS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Ping Zhao, Magnus Karlsson, Peter A. Andrekson
Summary: Low-noise optical amplifiers like compact, waveguide-based, parametric amplifiers utilizing four-wave mixing process have been pursued. An analytic model for phase-sensitive parametric amplifiers based on nonlinear optical waveguides is presented, considering the impact of linear loss. Si3N4 waveguides show potential for achieving 28 dB gain with a 0.8 dB noise figure, with research focusing on improving performance through cross-section design.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Physics, Applied
R. Stabile, G. Dabos, C. Vagionas, B. Shi, N. Calabretta, N. Pleros
Summary: The computing industry is transitioning from programming to learning, with non-von Neumann architectures leading to the development of more energy-efficient artificial intelligence chipsets. Neuromorphic photonics, with its potential for high neuron densities and energy efficiencies, requires breakthroughs in photonic material platforms and integration for computational engines. This paper proposes a novel three-dimensional computational unit in neuromorphic computing to enable scalable AI chipsets with superior computational speed and energy efficiency.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Aref Rasoulzadeh Zali, Steven Kleijn, Luc Augustin, Netsanet M. Tessema, Kristif Prifti, Ripalta Stabile, Nicola Calabretta
Summary: In this work, a low polarization-dependent SOA co-integrated with passive waveguides is designed, simulated, fabricated and characterized, showing potential applications in photonic integrated circuits. The simulation results are in good agreement with the experimental results, validating the feasibility of the design.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Bin Shi, Nicola Calabretta, Ripalta Stabile
Summary: This paper demonstrates the use of a wavelength converter based on cross-gain modulation in a semiconductor optical amplifier (SOA) as a nonlinear function integrated within an all-optical neuron. The impact of fully integrated linear and nonlinear functions on the neuron output is investigated. The performance of the monolithically integrated neuron is found to be better than that of the corresponding hybrid device in terms of accuracy. These all-optical neurons are then used to simulate a two-layer photonic deep neural network for handwritten digit classification, achieving high accuracy and energy efficiency compared to state-of-the-art graphics processing units. The importance of scaling photonic integrated neural networks on chip is emphasized.
Article
Engineering, Manufacturing
Chenhui Li, Srivathsa Bhat, Ripalta Stabile, Yuchen Song, Christian Neumeyr, Oded Raz
Summary: In this study, we designed an optical interface system for vertical coupling between VCSELs and 3 μm silicon waveguides, which achieved passive alignment and FCB using a photoresist lens and a total internal reflection mirror. The system was built by post-processing lens and metallic wiring on the backside of a 3 μm silicon photonic platform. After FCB and embedding of the VCSELs, the system performance was characterized, and a VCSEL-to-waveguide coupling efficiency of -7.5 dB was obtained.
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Aref Rasoulzadeh Zali, Ripalta Stabile, Nicola Calabretta
Summary: In this work, a low polarization-dependent semiconductor optical amplifier (SOA) that can be co-integrated with passive elements is designed and optimized. The designed layerstack ensures low reflection between SOA and passive waveguide, and the confinement factor of TE- and TM- modes is engineered to be approximately the same. The performance of different length SOAs in terms of gain, polarization-dependent gain (PDG), and noise figure is extensively investigated. Additionally, a booster SOA with higher output saturation power has been studied by widening the width of the SOA waveguide. The fabrication tolerance on the characteristics of SOA is also discussed.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Bin Shi, Nicola Calabretta, Ripalta Stabile
Summary: This paper introduces the application of a new parallelism method on top of existing parallelisms for photonic integrated processors in order to further accelerate the convolutional operation. The novel parallelism is achieved through an updated cross-connect architecture and cyclic array waveguide grating. In simulation, the photonic CNN system achieves a speed of 2.56 Tera operation/s and an end-to-end system energy efficiency of 3.75 pJ/operation, using 16 weighting elements and 10 Giga sample/s inputs. The proposed parallelism improves CNN acceleration by 4-16 times compared to state-of-the-art integrated convolutional processors, depending on the available weighting elements per convolutional core.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Desalegn Wolde Feyisa, Bin Shi, Rafael Kraemer, Nicola Calabretta, Ripalta Stabile
Summary: This paper presents a monolithically integrated, ultra-compact 8x8 optical space switch based on SOA gates, demonstrating a strictly non-blocking B&S switch architecture for improved network connectivity, bandwidth, and latency requirements.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Bin Shi, Nicola Calabretta, Ripalta Stabile
Summary: This study experimentally demonstrates the scaling emulation of a semiconductor optical amplifier (SOA) based integrated all-optical neural network and proposes a noise model for investigating signal degradation. The results indicate that an all-optical neuron with wavelength conversion can be used to build neural networks with arbitrary depth.
NEUROMORPHIC COMPUTING AND ENGINEERING
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
M. Mukit, M. Mamun, R. Stabile, N. Calabretta
Summary: This method utilizes an inverse adiabatic taper coupler for efficient fiber-to-chip coupling, achieving around 85% coupling efficiency.
2021 INTERNATIONAL CONFERENCE ON NUMERICAL SIMULATION OF OPTOELECTRONIC DEVICES (NUSOD)
(2021)
Proceedings Paper
Optics
Maria Spyropoulou, Giannis Kanakis, Yuqing Jiao, Ripalta Stabile, Nicola Calabretta, Kevin Williams, Virginie Nodjiadjim, Romain Hersent, Agnieszka Konczykowska, Richard Schatz, Oskars Ozolins, Mahdieh Joharifar, Jakub Zverina, Martin Zoldak, Paraskevas Bakopoulos, Giannis Patronas, Hercules Avramopoulos
Summary: The growth of modern IoT and 5G applications is driving internet traffic, imposing challenges for datacenters to meet increasing interconnections and bandwidth demands, requiring new architectures and high-radix switches. The ratification of 400 GbE standard drives the market of optical transceivers, but a technology upgrade will soon be necessary to accommodate the tremendous traffic growth, with the development of 800 Gb/s and 1Tb/s optical transceivers becoming a key focus.
METRO AND DATA CENTER OPTICAL NETWORKS AND SHORT-REACH LINKS IV
(2021)
Proceedings Paper
Optics
R. Stabile, N. Tessema, K. Prifti, D. W. Feyisa, B. Shi, N. Calabretta
Summary: This article introduces a novel modular optical metro core node architecture using photonic WDM integrated switches, achieving high scalability and innovation. The architecture includes multi-degree switching ROADM nodes and low-cost ROADM nodes, with photonic integrated switches designed as building blocks for high-performance network nodes.
METRO AND DATA CENTER OPTICAL NETWORKS AND SHORT-REACH LINKS IV
(2021)
Proceedings Paper
Optics
N. Calabretta, Kristif Prifti, Netsanet Tessema, Aref Rasoulzadehzali, Ripalta Stabile
Summary: The transparent optical metro edge nodes and DC networks, based on fast optical switches, are able to meet the scalable growth in network traffic volume and connected endpoints while reducing cost and energy consumption. Novel WDM photonic integrated switches with nanoseconds reconfiguration time and polarization independent operation offer flexibility in wavelength, space, and nanoseconds time domain, enabling high throughput networks. Application of dynamic optical metro networks and optical DCN architectures based on distributed nanoseconds WDM photonics integrated switches will be discussed.
INTEGRATED OPTICS: DEVICES, MATERIALS, AND TECHNOLOGIES XXV
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
M. Mamun, S. Mukit, R. Stabile, N. Calabretta
2020 22ND INTERNATIONAL CONFERENCE ON TRANSPARENT OPTICAL NETWORKS (ICTON 2020)
(2020)
Article
Optics
Maria Spyropoulou, Giannis Kanakis, Yuqing Jiao, Ripalta Stabile, Nicola Calabretta, Kevin Williams, Jean-Yves Dupuy, Agnieszka Konczykowska, Richard Schatz, Oskars Ozolins, Jakub Zverina, Martin Zoldak, Paraskevas Bakopoulos, Giannis Patronas, Hercules Avramopoulos
JOURNAL OF PHYSICS-PHOTONICS
(2020)
Proceedings Paper
Optics
METRO AND DATA CENTER OPTICAL NETWORKS AND SHORT-REACH LINKS III
(2020)
