Article
Optics
Tian Cui, Dapeng Liu, Fengyuan Liu, Zhijian Zhang, Zhenzhou Tang, Naidi Cui, Shilong Pan
Summary: This paper proposes a tunable optoelectronic oscillator (OEO) using a high-Q silicon nitride microring resonator (MRR) with a Q value of 4.36 x 105. By inserting the high-Q MRR into a phase-modulated link, an 8-38 GHz tunable microwave photonic filter (MPF) is realized with a 3-dB bandwidth of approximately 610 MHz. A tunable OEO is established based on the tunable MPF. The frequency range of the OEO is 14.60 to 25.65 GHz, and the measured phase noise of the 25.65 GHz oscillation signal is -88 dBc/Hz @ 10 kHz.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Zhifeng Peng, Taro Arakawa
Summary: A fourth-order Vernier serial coupled microring resonator (MRR) filter based on the InGaAs/InAlAs five-layer asymmetric coupled quantum-well (FACQW) waveguide is demonstrated. The MRR filter has lower tuning power consumption and high-speed operation due to the tuning of the main resonance wavelength driven by the QCSE in the FACQW layer. The free spectral range (FSR) of the MRR filter is extended to 9.4 nm.
Article
Engineering, Electrical & Electronic
Yifan Liu, Yu Chen, Lin Wang, Yu Yu, Yuan Yu, Xinliang Zhang
Summary: This paper presents a tunable and reconfigurable bandpass microwave photonic filter (MPF) using four cascaded silicon-on-insulator (SOI) microring resonators (MRRs). The center frequency and bandwidth of the filter can be adjusted by tuning the resonant wavelengths and coupling coefficients of the MRRs. The operation state of each MRR can be monitored for precise adjustment. Experimental results show that the filter maintains a high rejection ratio during the tuning process. This filter has potential applications in radar, sensor networks, and wireless communications.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Chi Xu, William E. Hayenga, Demetrios N. Christodoulides, Mercedeh Khajavikhan, Patrick LiKamWa
Summary: We demonstrate how the gain-loss contrast between two coupled identical resonators can be utilized to enhance the modulation frequency response of laser diodes. By adjusting the ratio of injection current levels, significant bandwidth improvement is achieved, up to 1.63 times the fundamental resonant frequency of individual devices.
Article
Physics, Multidisciplinary
Yu-Hang Liu, Tong Lin, Shao-Bo Li, Wen-Qi Yu, Xiang Ma, Xiao-Dong Liang, Bin-Feng Yun
Summary: To meet the demands for various applications, a multi-functional integrated optical filter is proposed, which is designed based on a tunable Sagnac loop reflector and a microring resonator. The device can be reconfigured into different types of filters by controlling thermal phase shifters. An analytical model is established and simulation results demonstrate the device's capabilities in achieving various spectral filtering functions. The proposed filter provides a new scheme for realizing flexible and tunable integrated photonic filters.
ACTA PHYSICA SINICA
(2023)
Article
Physics, Multidisciplinary
Jiacheng Liu, Chao Wu, Gongyu Xia, Qilin Zheng, Zhihong Zhu, Ping Xu
Summary: We designed a reconfigurable dual-interferometer coupled silicon nitride microring resonator, which can continuously adjust the critical coupling bandwidth and quality factor of the resonant mode by tuning the integrated heater on the interferometer's arms. The ability to achieve a variety of coupling methods from under-coupling to over-coupling allows for tuning the quality factor over a wide range. Our design is important for adjustable filtering on silicon nitride photonic chips and optimization of nonlinear processes in quantum photonics and all-optical signal processing.
Article
Optics
Shuhei Ohno, Qiang Li, Naoki Sekine, Hanzhi Tang, Stephane Monfray, Frederic Boeuf, Kasidit Toprasertpong, Shinichi Takagi, Mitsuru Takenaka
Summary: This study proposes a microring resonator (MRR) optical switch based on III-V/Si hybrid MOS optical phase shifter with an ultrathin InP membrane. By optimizing the device structure, a low power consumption, thermal-crosstalk-free, high-Q-factor MRR optical switch has been successfully demonstrated.
Article
Materials Science, Multidisciplinary
Yuhao Wu, Ruisi Zong, Huangpu Han, Shijia Lu, Jiajun Lin, Hairui Xie, Yuxuan Zhang, Shuangchen Ruan, Peigang Han, Bingxi Xiang
Summary: A diamond race-track microring resonator was designed on a lithium niobate/silicon substrate to combine the unique optical properties of diamond with the electro-optical characteristics of lithium niobate. The study systematically investigated the single-mode conditions, propagation loss, and dispersion of the waveguide, and optimized key parameters of the microring resonator. Simulation and analysis were conducted on the electro-optical tunable performance of the microring resonator, and the effects of waveguide core layer thickness and electric field strength were also discussed. The proposed work will help in manufacturing multi-functional and high-performance photonic integrated devices for optical communications and quantum optics.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Optics
Wei Wen Wong, Naiyin Wang, Chennupati Jagadish, Hark Hoe Tan
Summary: This study presents a novel approach to realize on-chip microlasers with directional emission in an all-dielectric, bottom-up grown material system. By coupling the laser emission into a vertical nanowire, efficient optical coupling is achieved and the emission directivity and side mode suppression can be improved by tuning the geometric parameters of the system.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Altynbek Dyussembayev, Dimitra Psychogiou
Summary: This letter introduces a new class of agile helical resonators and bandpass filters with continuously-tunable center frequency. The RF tuning is achieved by adjusting the liquid metal volume within a 3D-printed plastic tube that forms the inner conductor of the helical resonator. The study proposes a cost-effective and versatile integration scheme using 3D printing and pneumatically-actuated Galinstan. Experimental results demonstrate the feasibility of the proposed design, with manufactured prototypes showing tunability in center frequency and low insertion loss.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Wei-Che Hsu, Cheng Zhen, Alan X. Wang
Summary: Silicon microring resonators are crucial in photonic integration circuits for their low power consumption, high bandwidth, and compact size. This study introduces an electrically tunable silicon microring resonator with a high electro-optic tuning efficiency and low power consumption, which can be used to compensate for resonance wavelength drift caused by temperature fluctuation.
Article
Optics
Wei Wu, Qibing Sun, Guoxi Wang, Lingxuan Zhang, Wei Zhao
Summary: A novel graphene-on-silicon organic hybrid slot microring resonator (GSHMIR) was proposed for tunable all-optical logic gates, offering broadband ultra-flattened dispersion and high nonlinearity coefficient. Further investigations showed that the third-order dispersion affects the temporal drift of output pulses, demonstrating high-efficiency tunable all-optical AND logic function over a wide wavelength range.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Physics, Applied
Rongxuan Su, Sulei Fu, Zengtian Lu, Junyao Shen, Huiping Xu, Zhibin Xu, Rui Wang, Cheng Song, Fei Zeng, Weibiao Wang, Feng Pan
Summary: This study constructs a novel SAW filter with a heterostructure to enhance the central frequency and bandwidth while reducing the insertion loss. It achieves these effects by optimizing the electrode design and adjusting the electrode thickness of the resonators. The SAW filter is expected to become a filtering solution for the n77 band.
APPLIED PHYSICS LETTERS
(2022)
Article
Computer Science, Information Systems
Fan Yang, Yuhao Wu, Changlong Cai, Hong Fang, Elias Stathatos
Summary: This study proposes and simulates a numerical analysis of a diamond racetrack microring resonator on a lithium niobate thin film, operating at a 1.55 μm wavelength. The designed resonator exhibits a high quality factor and a high coupling efficiency, achieving resonant tunability near the 1.55 μm wavelength.
Article
Nanoscience & Nanotechnology
Shuhei Ohno, Rui Tang, Kasidit Toprasertpong, Shinichi Takagi, Mitsuru Takenaka
Summary: This article proposes an optical neural network scheme based on Si programmable photonic integrated circuits and presents a fully integrated prototype of a microring resonator crossbar array. This scheme enables on-chip image classification and training tasks, with scalability and power efficiency.
Article
Chemistry, Multidisciplinary
Nan Wang, Julian S. Evans, Jianhao Zhang, Chenxi Li, Sailing He
Summary: In a liquid crystal emulsion, chemically different guest phases reside in the topological disclinations of the host phase. These disclinations act as effective capillaries, leading to various meniscus and droplet phenomena. This demonstrates that anisotropic forces associated with liquid crystal molecules play a critical role in determining the shape and properties of a phase boundary.
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2023)
Article
Optics
Ruilin Chen, Ji DU, Yuan Wang, Chao Fei, Tianyi Zhang, Jiahan Tian, Guowu Zhang, Xiaojian Hong, Sailing He
Summary: This article introduces a blue-LED-based underwater wireless optical communication (UWOC) system that achieves real-time discrete Fourier transform spread discrete multi-tone (DFT-S DMT) signal transmission with a data rate of up to 30 Mbps over a 15-meter underwater channel. The article analyzes and discusses the architecture, usage of on-chip resources, and power consumption of the system. It also introduces spatial diversity reception to reduce the effects of multipath fading and received intensity fluctuation. The system utilizes Reed-Solomon (RS) codes and achieves error-free transmission of images over the underwater channel, demonstrating its potential in underwater applications.
Article
Engineering, Electrical & Electronic
Xiaogang Jiang, Haoling Yang, Xuan Liu, Daru Chen, Sailing He
Summary: A novel chalcogenide As2Se3 fiber with a twin-tube structure is proposed and studied for mid-infrared single-polarization single-mode operation. The fiber exhibits excellent confinement properties and a wide wavelength range, making it suitable for MIR photonics and nonlinear fiber optics.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Qiyun Lei, Zhonglin Luo, Xinyi Zheng, Na Lu, Yiming Zhang, Jianfeng Huang, Liu Yang, Shiming Gao, Yiyong Liang, Sailing He
Summary: This study presents a broadband transparent and flexible silver (Ag) mesh for efficient electromagnetic interference (EMI) shielding and high-quality free-space optical (FSO) communication in the X band. The Ag mesh demonstrates high transmission and low sheet resistance, achieving a high average EMI shielding effectiveness (SE) in the X band. The FSO communication benefits from the high optical transmittance and low haze, and it remains unaffected by chemical corrosions and bending cycles.
OPTICAL MATERIALS EXPRESS
(2023)
Review
Plant Sciences
Xiaotong Jiang, Berkley J. Walker, Sheng Yang He, Jianping Hu
Summary: Plants have a sophisticated immune system that coordinates with other biological and metabolic pathways to defend against biotic stresses. Photorespiration, a byproduct pathway of photosynthesis, is involved in defense responses and impacts the homeostasis of hydrogen peroxide, a crucial signaling molecule in plant immunity. Understanding the relationship between plant immunity and photorespiration is important for crop engineering to enhance photosynthesis without compromising plant immunity.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Physics, Applied
Yan Huang, Tie Zhang, Gao-Xuan Wang, Yu-Xin Xing, Sai-Ling He
Summary: A multi-gas sensing system based on wavelength-modulated differential photoacoustic spectroscopy was developed for simultaneous measurement of acetone and methane. It accurately assesses the concentration of acetone and methane, which is crucial for medical diagnosis purposes.
APPLIED PHYSICS LETTERS
(2023)
Article
Instruments & Instrumentation
Haolin Yang, Sailing He
Summary: Here, a high power dissipative soliton (DS) laser with a central wavelength of -1612 nm is proposed for applications in biomedical research and material processing. The study observes the automatic evolution of the DS pulses into noise-like (NL) pulses under high pumping strength, and achieves an output power of over 2W through the optimization of the amplifier system.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Yuan Wang, Chao Fei, Ji Du, Tianyi Zhang, Jiahan Tian, Ruilin Chen, Junwei Zhang, Guowu Zhang, Xiaojian Hong, Sailing He
Summary: This article proposes a novel spectrally efficient non-orthogonal discrete multi-tone (NODMT) system for underwater wireless optical communication to compensate for insufficient bandwidth. By using a real-valued correlation matrix, the complexity of decoders can be reduced. A new algorithm based on QR decomposition is proposed to effectively solve the issue of insufficient decoding capability in higher spectrum efficiency scenarios. Through experiments, the feasibility and effectiveness of the proposed algorithm are verified.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Zhenchao Liu, Tingbiao Guo, Qin Tan, Zhipeng Hu, Yuwei Sun, Houxin Fan, Zhi Zhang, Yi Jin, Sailing He
Summary: For the first time, an all-dielectric BIC metasurface is used for highly sensitive phase interrogation refractive index sensing. The proposed sensor achieves high performance and a high figure of merit, rivaling metal-based sensors. This scheme plays a pivotal role in the field of ultrahigh sensitivity sensors and opens possibilities for trace detection in biochemical analysis and environment monitoring.
Article
Optics
Qin Tan, Shengnan Wu, Zhenchao Liu, Xiaolu Chen, Sailing He
Summary: A compact label-free optofluidic sensor based on a polished hollow core Bragg fiber (HCBF) was proposed, which can simultaneously measure cortisol concentration and surrounding temperature in real-time. The sensor consists of fusion splicing single mode fiber (SMF), multimode fiber (MMF), and HCBF. By taking advantage of the high refractive index (RI) layers of HCBF, the sensor offers high sensitivity and specific sensing of cortisol with a limit of detection (LOD) of 4.303 pM. The sensor has a compact structure, enables temperature compensation, and is suitable for in-situ monitoring and high-precision sensing of cortisol and other biological analytes.
Article
Engineering, Electrical & Electronic
Jiahan Tian, Tingbiao Guo, Nan He, Ji Du, Qiangsheng Huang, Xiaojian Hong, Chao Fei, Yuan Wang, Tianyi Zhang, Junping Zhang, Sailing He
Summary: Modulating retro-reflector (MRR) free-space optical (FSO) communication technology is crucial for small-sized optical links and holds promise for application in small platforms. In this article, a wide field-of-view (FOV) MRR using an image space telecentric lens is proposed, and a bidirectional FSO communication system is experimentally demonstrated. The experimental results show that the designed MRR has a FOV of up to 110 degrees, achieving low bit error rates for both downstream and upstream signals.
IEEE PHOTONICS JOURNAL
(2023)
Article
Computer Science, Artificial Intelligence
Junwei Lang, Zhenjia Zeng, Tengfei Ma, Sailing He
Summary: Sudden air pollution accidents in chemical industry parks can cause significant harm to people, property, and the ecological environment. A gas tracking network using traceability technology and distributed sensors can monitor the diffusion of hazardous gases in a timely manner, helping to locate the source of pollutants and control major hazards. However, tracing the source of leaks in a large area, especially within an urban area, remains challenging.
Article
Optics
Zijian Lin, Tingbiao Guo, Xiao Chen, Jiahan Tian, Zhi Zhang, Sailing He
Summary: This paper proposes a new method for spectral imaging, which combines a liquid crystal cell with a commercial color camera. The method achieves high-quality multispectral imaging with a high frame rate and overcomes the tradeoff between spectral resolution and time resolution. The potential application of the method in metamerism recognition is demonstrated.
Article
Computer Science, Information Systems
Dawei Gong, Lingling Yan, Binbin Gu, Ruili Zhang, Xinli Mao, Sailing He
Summary: The study aims to develop a computer-assisted diagnosis system for distinguishing different types of chronic gastritis. By utilizing a novel network model and image analysis methods, the study achieved breakthroughs in high accuracy and minimal parameter requirements.
Article
Engineering, Electrical & Electronic
Zongxing Lin, Sailing He
Summary: In this article, a high-performance polarization beam splitter (PBS) based on a 220-nm SOI platform is proposed and experimentally demonstrated. The proposed PBS utilizes a sub-wavelength grating-assisted adiabatic directional coupler and a simple filter to achieve high separation and low insertion loss for TE and TM modes.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)