Article
Nanoscience & Nanotechnology
Hongyin Zhou, Kun Liao, Zhaoxian Su, Tianhao Li, Guangzhou Geng, Junjie Li, Yongtian Wang, Xiaoyong Hu, Lingling Huang
Summary: This study presents a tunable mode converter filled with liquid crystal that enables high-order mode conversion and dynamic tunability. The design flow based on the adjoint method is experimentally validated, and it is shown to be an efficient tool for multifunction device design.
Article
Optics
Peng Hao, Zhenchuan Wang, X. Steve Yao
Summary: We propose and demonstrate a Lidar beam-forming scheme using wavelength-division-multiplexing (WDM) and time-division-multiplexing (TDM), which eliminates the need for moving parts. The scheme achieves beam formation by demultiplexing lights with different wavelengths into N waveguides (WDM channels) and further switching them into M waveguides (TDM channels) to point in different directions. We have successfully demonstrated the scheme using 4 WDM channels and 1 x 4 optical fiber switches, together with time-of-flight (ToF) technique for distance measurement. This combined TDM and WDM scheme offers an attractive alternative to existing beam scanning methods.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Weigang Hou, Pengxing Guo, Lei Guo, Xu Zhang, Hui Chen, Weichen Liu
Summary: This paper proposes O-Star, a scalable optical switching architecture for on-chip many-core systems. It utilizes hybrid mode and wavelength division multiplexing technology to enable non-blocking switching and parallel data transmission.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Mingli Zou, Liqun Sun, Xuan Wang
Summary: We proposed a six-gas simultaneous detection system based on wavelength modulation spectroscopy (WMS), using five different lasers combined with a wavelength division multiplexer to detect the six gases. The gases were measured using frequency division multiplexing (FDM) and time division multiplexing (TDM) principles. A Raspberry Pi was used for data processing and displaying the detected gas concentrations. The system exhibited fast response time, compact size, and high detection sensitivity, making it promising for dissolved gas analysis (DGA) in transformer oil and other material aging processes.
IEEE SENSORS JOURNAL
(2022)
Article
Physics, Multidisciplinary
Sang Di, Xu Ming-Feng, An Qiang, Fu Yun-Qi
Summary: In this paper, a freeform wavelength division multiplexing (WDM) metagrating with a large deflection angle and polarization-insensitive characteristics is inversely designed by using an adjoint multi-objective topology optimization method. The designed metagrating has the advantages of large deflection angle, high efficiency, and low spatial crosstalk, making it suitable for applications in optical communication, micro and nano-optical field modulation, and Rydberg atom-based microwave measurements.
ACTA PHYSICA SINICA
(2022)
Article
Optics
Yaotian Zhao, Jinlong Xiang, Yu He, Yuchen Yin, An He, Yong Zhang, Zongyin Yang, Xuhan Guo, Yikai Su
Summary: Wavelength-division multiplexing (WDM) technology provides considerable parallelism for large-capacity data communications, and the emerging metamaterial-assisted silicon photonics technology enables more compact on-chip light manipulation, resulting in wavelength (de)multiplexers with smaller footprints and broader functionalities.
LASER & PHOTONICS REVIEWS
(2022)
Article
Engineering, Electrical & Electronic
Xingyuan Xu, Weiwei Han, Mengxi Tan, Yang Sun, Yang Li, Jiayang Wu, Roberto Morandotti, Arnan Mitchell, Kun Xu, David J. Moss
Summary: Optical neural networks (ONNs) based on wavelength-division multiplexing (WDM) techniques offer high bandwidth and analog architecture for enhanced computing power and energy efficiency. Integrated microcombs have been used to implement ONNs, with successful applications such as optical convolution accelerators for human image processing at 11 Tera operations per second. However, challenges and limitations of ONNs still need to be addressed for future applications.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Zhonghan Wang, Qiang Wang, Xu Han, Yuxi Fang, Yuxuan He, Wenpu Geng, Zhongqi Pan, Yang Yue
Summary: The combination of laser diode arrays and photo diode arrays can be used in short-distance optical communication and photonics-based lidar, and the angular resolution can be improved through optimized design.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Frank Brueckerhoff-Plueckelmann, Johannes Feldmann, Helge Gehring, Wen Zhou, C. David Wright, Harish Bhaskaran, Wolfram Pernice
Summary: The integration of artificial intelligence systems has led to a significant increase in data generation and processing, requiring compact and energy-efficient hardware. This paper presents an optimized layout for a photonic tensor core (PTC) that performs real-valued matrix vector multiplications at telecommunication wavelengths. The use of phase-change material as an optical attenuator allows for positive-valued multiplications, while a novel symmetric multiplication unit enables the multiplication of arbitrary real factors. The integration of wavelength multiplexers (MUX) and a photonic crossbar array on-chip paves the way for fully integrated systems.
Article
Optics
Yuxiang Yin, Hang Yu, Donghe Tu, Xingrui Huang, Zhiguo Yu, Huan Guan, Zhiyong Li
Summary: A 64-channel hybrid (de)multiplexer for wavelength-division multiplexing (WDM) and mode-division multiplexing (MDM) is designed and demonstrated on a 220nm SOI platform for large capacity optical interconnections. The (de)multiplexer includes a 4-channel mode (de)multiplexer and 16-channel wavelength-division (de)multiplexers. The experimental results show that the excess loss is below 3.9dB in one free spectral range and below 5.6dB in three free spectral ranges, and the intermode crosstalks range from -23.2dB to -33.2dB.
Article
Computer Science, Hardware & Architecture
Nan Zhao, Meizhen Jing, Zheng Yan
Summary: This article introduces the power division technique in the view of green communications, showing its potential in saving energy and optimizing energy utilization in the 5G system.
Article
Engineering, Electrical & Electronic
Xun Guan, Wei Shi, Leslie Ann Rusch
Summary: Silicon photonics combined with microring modulators can achieve ultra-dense wavelength division multiplexing transmission, enhancing spectral efficiency. The study reports achieving channel spacing comparable to the symbol rate in each WDM channel, reaching 80% spectrum occupation, while also addressing interchannel interference issues.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Shan Wang, Hailin Yang, Yuwen Qin, Di Peng, Songnian Fu
Summary: This study investigates the potential of space division multiplexing (SDM) for power-over-fiber (PWoF) technique, and verifies it through weakly-coupled multicore fiber (WC-MCF) design and experiments. The results show that the SDM-enabled PWoF scheme is superior to the wavelength division multiplexing (WDM) scheme in terms of energy light delivery scalability and wavelength division multiplexing savings.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Quantum Science & Technology
Chang Hoon Park, Min Ki Woo, Byung Kwon Park, Yong-Su Kim, Hyeonjun Baek, Seung-Woo Lee, Hyang-Tag Lim, Seung-Woo Jeon, Hojoong Jung, Sangin Kim, Sang-Wook Han
Summary: Recent research has shown that while QKD networks using conventional protocols have been studied thoroughly, twin-field QKD (TF-QKD) has succeeded in long-distance QKD, but has only been verified for ring networks.
NPJ QUANTUM INFORMATION
(2022)
Article
Engineering, Electrical & Electronic
Shimpei Shimizu, Takayuki Kobayashi, Takushi Kazama, Masanori Nakamura, Akira Kawai, Koji Enbutsu, Takeshi Umeki, Yutaka Miyamoto
Summary: This paper investigates the conversion of gain saturation into nonlinear amplitude distortion in a 64-Gbaud 64QAM WDM signal in a periodically poled LiNbO3 (PPLN) based optical parametric amplifier (OPA). The results show that increasing the number of WDM channels can suppress nonlinear amplitude distortion, and for a 75-GHz-spacing 64-channel WDM configuration, the total input power tolerance was improved by about 10 dB compared to a single-channel case. The experiment also confirms that there is almost no wavelength dependence of the effect of gain saturation on the signal distortion.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Metodi Plamenov Yankov, Francesco Da Ros, Uiara Celine de Moura, Andrea Carena, Darko Zibar
Summary: The problem of Raman amplifier optimization is studied by using machine learning to obtain a differentiable interpolation function for the Raman gain coefficient. The frequency and power of forward-propagating Raman pumps are optimized for arbitrary data channel load and span length. By combining the forward propagation model and a backward-pumping Raman amplifier ML model, the joint optimization of forward and backward amplifiers is demonstrated for unrepeatered transmission. A gain flatness of < 1 dB over 4 THz is achieved, and the optimized amplifiers are validated using a numerical simulator.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Uiara C. de Moura, Darko Zibar, A. Margareth Rosa Brusin, Andrea Carena, Francesco Da Ros
Summary: In this paper, a fiber-agnostic neural network model is proposed to predict the gain profile of a new fiber type based on experimental data from different optical fibers. The results show that a wide range of optical fiber parameters is necessary to accurately predict the gain of a new fiber. Additionally, the use of transfer learning is proposed to improve the general model's accuracy with limited experimental measurements.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Muralikrishnan Srinivasan, Jinxiang Song, Alexander Grabowski, Krzysztof Szczerba, Holger K. Iversen, Mikkel N. Schmidt, Darko Zibar, Jochen Schroder, Anders Larsson, Christian Hager, Henk Wymeersch
Summary: Optical interconnects (OIs) based on vertical-cavity surface-emitting lasers (VCSELs) are widely used in data centers, supercomputers, and vehicles for low-cost, high-rate connectivity. Machine learning (ML) techniques, including deep neural networks, have been applied to improve the performance of VCSEL-based OIs. End-to-end (E2E) autoencoder approaches can optimize the entire parameterized transmitters and receivers for ultimate performance. This tutorial paper provides an overview of ML for VCSEL-based OIs, focusing on E2E approaches and addressing the unique challenges of VCSELs.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Matilde Cescon, Elena Rampazzo, Silvia Bresolin, Francesco Da Ros, Lorenzo Manfreda, Alice Cani, Alessandro Della Puppa, Paola Braghetta, Paolo Bonaldo, Luca Persano
Summary: Collagen VI has a distinct distribution within GBM tumors and is strongly correlated with aggressive and phenotypically immature cells. It sustains the stem-like properties of GBM cells and promotes cancer cell proliferation and survival. Collagen VI plays a pivotal role in GBM tumor biology, affecting phenotypic identity, gene transcription, and response to treatment.
CELLULAR AND MOLECULAR LIFE SCIENCES
(2023)
Article
Engineering, Electrical & Electronic
Ali Cem, Siqi Yan, Yunhong Ding, Darko Zibar, Francesco Da Ros
Summary: Photonic integrated circuits are advancing optical neural networks, which could potentially outperform electronic counterparts in speed and energy efficiency due to the suitability of optical signals for matrix multiplication. However, programming photonic chips for accurate optical matrix multiplication remains challenging.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Ognjen Jovanovic, Francesco Da Ros, Darko Zibar, Metodi P. Yankov
Summary: This paper compares the performance of gradient-free optimization algorithms, model-free optimization, and backpropagation in end-to-end learning on a fiber-optic channel. The results show that the gradient-free optimization algorithms provide a decent replacement to backpropagation in terms of performance, but with higher computational complexity. Additionally, the impact of finite bit resolution converters on geometrically shaped constellations is analyzed.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Computer Science, Hardware & Architecture
Muhammad Umar Masood, Lorenzo Tunesi, Ihtesham Khan, Bruno Correia, Rasoul Sadeghi, Enrico Ghillino, Paolo Bardella, Andrea Carena, Vittorio Curri
Summary: To support the increasing demand for bandwidth-intensive applications, the capacity of the optical transport network needs to be expanded. Multi-band transmission solutions can achieve this by utilizing low-loss optical spectrum windows and the existing fiber infrastructure. A novel reconfigurable optical add-drop multiplexer (ROADM) architecture using a modular photonic integrated multi-band wavelength selective switch (WSS) is proposed in this study, with comprehensive network performance analysis conducted to demonstrate the benefits of transitioning to multi-band transmission.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Proceedings Paper
Nanoscience & Nanotechnology
Francesco Da Ros, Ali Cem, Yevhenii Osadchuk, Ognjen Jovanovic, Darko Zibar
Summary: This article reviews two specific applications of neural networks in photonics: learning direct models for optical matrix multipliers and inverse modeling for short-reach fiber communication systems.
2023 IEEE PHOTONICS SOCIETY SUMMER TOPICALS MEETING SERIES, SUM
(2023)
Proceedings Paper
Nanoscience & Nanotechnology
Francesco Da Ros, Metodi Yankov, Mehran Soltani, Andrea Carena, Darko Zibar
Summary: In this article, recent efforts in amplifier modeling for amplifier inverse design to full system optimization are reviewed, from physics-based to black-box modeling.
2023 IEEE PHOTONICS SOCIETY SUMMER TOPICALS MEETING SERIES, SUM
(2023)