Article
Engineering, Electrical & Electronic
Yaqin Guo, Chaoqin Gan, Nianfei Zhan
Summary: This paper introduces a cost-effective tree architecture that enables flexible communication between ONUs, with higher wavelength utilization and lower transmission latency. The proposed scheme creatively utilizes proximal nodes and spatial isolation to improve the efficiency of communication signals within the same WDM-PON.
OPTICAL FIBER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Jiahua Yang, Xiaopeng Dong
Summary: This article proposes a novel multipoint gas detection scheme based on the photothermal effect and interferometer. By incorporating fiber Bragg gratings with different central wavelengths in the interferometer, gas concentration information can be extracted from different gas cells, enabling simpler and more efficient installation. The experiment validates the effectiveness of the method in reducing noise and crosstalk, and demonstrates successful acetylene detection.
IEEE SENSORS JOURNAL
(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
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
Yuki Ishihara, Mrinmoy Roy, Carlos Alfredo Ruiz Pineda, Akihiro Maruta, Ken Mishina
Summary: This study proposes a triple-band transmission system using only C-band transceivers and all-optical wavelength conversions. By employing silicon-rich nitride waveguides, wavelength conversion can be achieved on photonic integrated circuits with superior performance. Through the design and demonstration of the SRN waveguide, the feasibility of this method in wideband transmission systems is shown.
IEEE PHOTONICS JOURNAL
(2022)
Article
Optics
Luis Carlos Mathias, Leonimer Flavio de Melo, Taufik Abrao
Summary: The study focuses on modeling Wavelength Division Multiplexing (WDM) and Orthogonal Frequency Division Multiplexing (OFDM) in Visible Light Communication (VLC) systems to evaluate and mitigate spectral crosstalk (SC). A more realistic system model is proposed by considering optical diversity and non-ideal behaviors, and an SC mitigation scheme is introduced to suppress interfering signals and evaluate Bit Error Rate (BER).
OPTICS COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Benshan Wang, Thomas Ferreira de Lima, Bhavin J. Shastri, Paul R. Prucnal, Chaoran Huang
Summary: Digital signal processing (DSP) has played a crucial role in optical communication systems, but the limitations of DSP chips have hindered the deployment of computationally costly algorithms. Photonic neural networks offer a promising solution to these challenges, with better performance and lower power consumption. This study proposes a photonic recurrent neural network (RNN) capable of processing optical signals and effectively addressing fiber nonlinearities in the photonic domain, achieving reduced power consumption and latency compared to traditional DSP chips.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Manabu Arikawa, Mingqi Wu, Keisuke Yasuhara, Daishi Masuda, Kazunori Hayashi, Takanori Inoue, Yoshihisa Inada
Summary: We conducted long-haul transmissions over coupled four-core fibers in a 15-km-long submarine cable, achieving small propagation loss and spatial-mode dispersion. Using adaptive multi-layer filters, we obtained error-free transmission up to 6000 km with 16-channel wavelength-division multiplexed and 4-core space-division multiplexed signals. We also evaluated transmission performance and mode dependent loss, and found that further suppression of MDL is necessary for longer distances and more stable performance.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Fumi Nakamura, Hideaki Asakura, Keijiro Suzuki, Ken Tanizawa, Minoru Ohtsuka, Nobuyuki Yokoyama, Kazuyuki Matsumaro, Miyoshi Seki, Kazuhiro Ikeda, Shu Namiki, Hitoshi Kawashima, Hiroyuki Tsuda
Summary: A novel 1 x M fold-back type wavelength selective switch (WSS) is designed to have fewer waveguide crossings, reducing excess crosstalk and loss in lightwave circuits. By using a fold-back architecture, the number of crossings can be reduced to less than half of a conventional design, improving performance and scalability. The switching operation of a 200-GHz spacing, 20-channel, 1 x 2 silicon WSS in a fold-back configuration is demonstrated, showing promising results with average insertion loss and extinction ratio.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
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
Engineering, Electrical & Electronic
Hai-Han Lu, Xu-Hong Huang, Yu-Ting Chen, Poh-Suan Chang, Yan-Yu Lin, Ting Ko, Chen-Xuan Liu
Summary: This study demonstrates a WDM-VLLC and white-lighting ring network with high-speed VLLC links and reading/writing-level white-light illumination. The use of multiple laser diodes and optical add-drop multiplexing allows for two-way operation and point-to-multipoint transmission capability.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
C. A. Xiang-Peng
Summary: Visible light communication (VLC) technology offers high bandwidth and strong anti-interference capability, with great potential applications in healthcare for transmitting patient information. By utilizing simple encoding schemes and multiplexing technologies, efficient VLC systems can be designed to enhance data transmission capacity and bandwidth.
FRONTIERS IN PHYSICS
(2021)
Article
Optics
Vikram Singh, Sarvesh Kumar, Pradeep Kumar Dimri
Summary: This article presents a comparative analysis of XPM crosstalk in SCM-WDM link due to the 4OD parameter, showing that it has a significant impact on the crosstalk. Results obtained from NLSE and coupled equations are compared, revealing different ranges of XPM crosstalk under varying modulation frequencies, transmission lengths, and optical powers.
Article
Engineering, Electrical & Electronic
Themistoklis Chrysostomidis, Ioannis Roumpos, Konstantinos Fotiadis, Jinfeng Mu, Athanasios Manolis, Christos Vagionas, Meindert Dijkstra, Sonia Garcia Blanco, Theonitsa Alexoudi, Konstantinos Vyrsokinos
Summary: This paper presents a comprehensive study on the high-speed wavelength-division multiplexing (WDM) transmission capabilities of a monolithically integrated Al2O3:Er3+ spiral waveguide amplifier. The results demonstrate high-performance transmission at different data rates and without the need for digital signal processing (DSP) applied on the transmitter or receiver side.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
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
Optics
Shaofan Yuan, Doron Naveh, Kenji Watanabe, Takashi Taniguchi, Fengnian Xia
Summary: The single-photodetector spectrometer based on black phosphorus demonstrates excellent performance in the 2-9 µm wavelength range, with a compact footprint of 9 x 16 µm^2 and electrically reconfigurable nature. It is suitable for on-chip mid-infrared spectroscopy and spectral imaging, eliminating bulky interferometers and gratings.
Article
Chemistry, Multidisciplinary
Chen Chen, Cheng Li, Seunghwan Min, Qiushi Guo, Zhenyang Xia, Dong Liu, Zhenqiang Ma, Fengnian Xia
Summary: The study introduces an ultrafast silicon nanomembrane microbolometer with a small heat capacity and quick response time, using a compact antenna for efficient light absorption. This microbolometer can operate at high speeds and has the potential to become a future solution for high-resolution and high-speed LWIR imaging.
Article
Multidisciplinary Sciences
Chao Ma, Shaofan Yuan, Patrick Cheung, Kenji Watanabe, Takashi Taniguchi, Fan Zhang, Fengnian Xia
Summary: The discovery of tunable mid-infrared bulk photovoltaic effect in twisted double bilayer graphene points to the unique role of moire engineered quantum geometry in tunable nonlinear light-matter interactions. The photoresponse heavily relies on the polarization state of excitation light and can be highly tuned by external electric fields.
Biographical-Item
Engineering, Electrical & Electronic
Fengnian Xia, H. -S. Philip Wong
Summary: This scientist and engineer have played a significant role in shaping semiconductor technologies.
NATURE ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Matthieu Fortin-Deschenes, Rui Pu, Yan-Feng Zhou, Chao Ma, Patrick Cheung, Kenji Watanabe, Takashi Taniguchi, Fan Zhang, Xu Du, Fengnian Xia
Summary: In this study, using superconducting quantum interferometry, edge states with unusual moire band topology were discovered in twisted bilayer graphene.
Editorial Material
Chemistry, Physical
Matthieu Fortin-Deschenes, Fengnian Xia
Summary: Layered silicon diphosphide exhibits unique excitonic states with linearly dichroic photoluminescence and strong exciton-phonon coupling.
Article
Chemistry, Analytical
Yan Zhang, Keyin Li, Yaoyao Zhao, Weihua Shi, Hrishikesh Iyer, Sungho Kim, Christopher Brenden, Jonathan V. Sweedler, Yurii Vlasov
Summary: We demonstrate a silicon-based integrated microfluidic platform for multiplexed analysis of neurochemicals in picoliter droplets via nanoelectrospray ionization (nESI)-mass spectrometry (MS). The developed system allows effective detection of multiple neurochemicals in low picoliter volumes, showing promising applications in monitoring a range of brain chemicals.
ANALYTICAL CHEMISTRY
(2022)
Article
Physics, Multidisciplinary
Shunran Li, Xiaotong Li, Conrad A. Kocoj, Xiaoqin Ji, Shaofan Yuan, Eleni C. Macropulos, Constantinos C. Stoumpos, Fengnian Xia, Lingling Mao, Mercouri G. Kanatzidis, Peijun Guo
Summary: This study investigates the impact of organic spacers on excitons in 2DHPs through femtosecond pump-probe spectroscopy, revealing two distinct temporal response regimes. Vibrational excitation enhances biexciton emission, indicating the influence of vibrations on exciton confinement and exciton detrapping from defect states.
PHYSICAL REVIEW LETTERS
(2022)
Article
Biochemical Research Methods
Weihua Shi, Sara Bell, Hrishikesh Iyer, Christopher Kenji Brenden, Yan Zhang, Sungho Kim, Insu Park, Rashid Bashir, Jonathan Sweedler, Yurii Vlasov
Summary: The silicon single-chip microfluidics system integrates microscale fluidic channels, an analyte segmentation device, and a nozzle for electrohydrodynamic-assisted printing, achieving highly sensitive and spatially resolved mass spectrometry imaging analysis.
Article
Chemistry, Physical
Du Chen, Matthieu Fortin-Deschenes, Yuchen Lou, Huiju Lee, Joy Xu, Abrar A. . Sheikh, Kenji Watanabe, Takashi Taniguchi, Yi Xia, Fengnian Xia, Peijun Guo
Summary: Two-dimensional (2D) transition metal chalcogenides (TMDs) have attracted significant attention recently due to their exceptional optical and electronic properties. Various methods have been developed to measure the thermal conductivity and interfacial thermal conductance in 2D van der Waals (vdW) heterostructures, such as optothermal Raman spectroscopy and time-domain thermoreflectance. In this study, we use vibrational-pump-visible-probe (VPVP) spectroscopy to directly visualize the heat transfer process in a heterostructure of multilayer h-BN and monolayer WS2. By corroborating the experiments with heat transfer calculations, we obtain the interfacial thermal conductance of the h-BN/WS2 and WS2/SiO2 interfaces. Our study demonstrates a time-resolved optical method to measure cross-plane heat dissipation and provides a new pathway to investigate interlayer interactions in vdW heterostructures.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Editorial Material
Chemistry, Physical
Matthieu Fortin-Deschenes, Fengnian Xia
Summary: By sustaining the release of precursor species, it becomes possible to control the vapour transport mode and grow single-crystalline black phosphorus and black phosphorus-arsenic thin films on a millimetre scale.
Review
Multidisciplinary Sciences
Shaofan Yuan, Chao Ma, Ethan Fetaya, Thomas Mueller, Doron Naveh, Fan Zhang, Fengnian Xia
Summary: Geometry, as an ancient yet vibrant branch of mathematics, has significant and far-reaching impacts on various disciplines. In this article, we introduce a novel concept called geometric deep optical sensing, which is based on recent advancements in optical sensing and imaging. It involves the use of reconfigurable sensors to directly extract rich information from unknown incident light beams, including intensity, spectrum, polarization, spatial features, and angular momentum. We discuss the physical, mathematical, and engineering foundations of this concept, with a focus on classical and quantum geometry as well as deep neural networks. Furthermore, we explore the potential opportunities and challenges associated with this emerging scheme.
Article
Chemistry, Physical
Matthieu Fortin-Deschenes, Kenji Watanabe, Takashi Taniguchi, Fengnian Xia
Summary: The unique physics in moire superlattices of twisted or lattice-mismatched atomic layers holds great promise for future quantum technologies. However, twisted configurations are thermodynamically unfavourable, making accurate twist angle control during growth implausible. While rotationally aligned, lattice-mismatched moires such as WSe2/WS2 can be synthesized, they lack the critical moire period tunability, and their formation mechanisms are not well understood. Here, we report the thermodynamically driven van der Waals epitaxy of moires with a tunable period from 10 to 45 nanometres, using lattice mismatch engineering in two WSSe layers with adjustable chalcogen ratios. Contrary to conventional epitaxy, where lattice-mismatch-induced stress hinders high-quality growth, we reveal the key role of bulk stress in moire formation and its unique interplay with edge stress in shaping the moire growth modes. Moreover, the superlattices display tunable interlayer excitons and moire intralayer excitons. Our studies unveil the epitaxial science of moire synthesis and lay the foundations for moire-based technologies.
Article
Chemistry, Analytical
Sara E. Bell, Insu Park, Stanislav S. Rubakhin, Rashid Bashir, Yurii Vlasov, Jonathan V. Sweedler
Summary: Microfluidics and mass spectrometry are commonly used to analyze biological systems. This study focused on the effects of different oil phases in droplet microfluidics for MALDI-MS analysis, with FC-40 oil phase found to provide the best detectability. Additionally, the impact of surfactant perfluorooctanol on analyte detection was investigated.
ACS MEASUREMENT SCIENCE AU
(2021)
Article
Materials Science, Multidisciplinary
Chen Chen, Xiaolong Chen, Bingchen Deng, Kenji Watanabe, Takashi Taniguchi, Shengxi Huang, Fengnian Xia
Summary: By probing the interlayer interaction in layered honeycomb materials via chiral phonons, we found that the chirality of the Raman G mode decreases with increasing layer numbers. Our Raman tensor calculation results agree well with the experiments, indicating that the interlayer interaction can significantly influence lattice vibration.
