Article
Optics
Ashutosh Rao, Gregory Moille, Xiyuan Lu, Daron A. Westly, Davide Sacchetto, Michael Geiselmann, Michael Zervas, Scott B. Papp, John Bowers, Kartik Srinivasan
Summary: The study introduces an integrated photonics interposer architecture that effectively handles microcomb signals and achieves octave-spanning spectral filtering of optical frequency combs. This technology addresses the challenge of on-chip microcomb processing and has the potential to further apply miniaturized optical systems to other metrology-grade applications successfully.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Optics
Xincai Diao, Runzhi Chen, Guoqing Chang
Summary: SESS technology can generate wavelength-tunable femtosecond pulses with a wide tuning range and high energy conversion efficiency. By optimizing dispersion parameters, a larger tuning range and higher conversion efficiency can be achieved.
Article
Optics
Haizhong Weng, Jia Liu, Adnan Ali Afridi, Jing Li, Jiangnan Dai, Xiang Ma, Yi Zhang, Qiaoyin Lu, John F. Donegan, Weihua Guo
Summary: This study introduces a simple method to achieve octave-spanning DKS in an aluminum nitride microresonator. By using two nearly degenerate modes, a single pump can generate DKS and enhance soliton access window.
PHOTONICS RESEARCH
(2021)
Article
Engineering, Electrical & Electronic
Ji-Liang Wu, Xiaohui Guo, Yadong Jiao, Xucheng Zhang, Ting Wang, Yue-De Yang, Jin-Long Xiao, Daming Zhang, Guanshi Qin, Yong-Zhen Huang
Summary: In this study, an octave-spanning 10-GHz optical comb is achieved using a directly-modulated microlaser, and the optical pulse width is further reduced to 140 fs in a fiber through optimal chirp compensation.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Jeong-uk Shin, Wosik Cho, Kyunghoon Yeom, Kyung Taec Kim
Summary: We present a new pulse shaper that disperses an incident laser beam angularly and then splits it into separate beams using multiple prisms. This pulse shaper allows independent control of the amplitude and phase of the beams, enabling the production of pulses with desired temporal shapes. Additionally, it introduces a significant amount of negative group delay dispersion (GDD) over an octave spectrum near visible, compensating for the positive GDD accumulated during spectral broadening. Consequently, single-cycle or few-cycle laser pulses can be generated without the need for chirped mirrors.
Article
Optics
Ting Wang, Ji-Liang Wu, Xu-Cheng Zhang, Yang Shi, Yue-De Yang, Jin-Long Xiao, Da-Ming Zhang, Guan-Shi Qin, Yong-Zhen Huang
Summary: In this paper, we demonstrate the generation of octave-spanning optical frequency combs with a repetition rate of tens of GHz for the first time using a four-wave mixing effect seeded by a dual-mode microcavity laser. Wideband optical frequency combs are generated using a Brillouin nonlinear fiber loop and shaped through optical filtering. The high-repetition-rate pulse train is amplified and compensated for dispersion, resulting in an octave optical comb spanning from 1100 to 2200 nm. We achieve frequency combs with octave bandwidths and repetition rates using dual-mode microcavity lasers.
PHOTONICS RESEARCH
(2022)
Article
Optics
Pedro Parra-Rivas, Sabrina Hetzel, Yaroslav Kartashov, Pedro Fernandez de Cordoba, J. Alberto Conejero, Alejandro Aceves, Carles Milian
Summary: We theoretically investigate the dynamics, bifurcation structure, and stability of localized states in Kerr cavities driven at the pure fourth-order dispersion point. The study reveals the existence of stable narrow bright solitons in the normal group velocity dispersion regime and stable single and multi-peak localized states in the anomalous regime over a wider parameter space.
Article
Optics
Lutong Cai, Jingwei Li, Ruixuan Wang, Qing Li
Summary: The team reported the first demonstration of octave-spanning microcombs on a silicon carbide platform. The broadband operation was achieved through optimized nanofabrication and dispersion engineering, resulting in a microcomb spectrum covering a wavelength range from 1100 nm to 2400 nm.
PHOTONICS RESEARCH
(2022)
Article
Optics
Mulong Liu, Chengwei Gu, Xuening Fan, Zhiheng Li, Huimin Huang, Zhizhou Lu, Wei Zhao
Summary: The study introduces a dispersion-flattened technology for producing broadband and low anomalous dispersion while minimizing zero-dispersion wavelengths. This structure can be formed by nanophotonic waveguides using different material combinations, achieving flat dispersion ranging from 0 to 27 ps/nm/km across a wide range of wavelengths.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Quantum Science & Technology
Zhen Jiang, Yanghe Chen, Chun Jiang, Guangqiang He
Summary: This article presents a theoretical method for generating high-dimensional entangled quantum frequency combs in valley-Hall topological resonators and demonstrates their topological protection and robustness. This research is of great significance for the generation and control of topologically protected high-dimensional quantum states in integrated photonic crystal platforms.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Optics
Mikhail Roiz, Markku Vainio
Summary: This study proposes and demonstrates a versatile method for near- and mid-infrared optical frequency comb generation using multi-seeded femtosecond optical parametric generation, showing flexibility and adjustability.
Article
Optics
Gwangho Choi, Adley Gin, Judith Su
Summary: The ability to detect and identify molecules without labels or capture agents is crucial for various applications. This study explores the use of microtoroid optical resonators and optical frequency combs for label-free single molecule detection and high precision spectroscopic information. The researchers overcame key challenges in generating a frequency comb in both air and aqueous solution, potentially enabling the detection and identification of single molecules without labels at any wavelength.
Article
Engineering, Electrical & Electronic
Zhongjing Hu, Lijuan Xu, Jing Wang, Yuke Zhai, Lin Zhang
Summary: This study demonstrated supercontinuum generation in a dispersion-engineered silicon nitride waveguide pumped with 10ps pulses at 1550 nm wavelength, resulting in a spectrum from 656 to 3867 nm with power variation <15 dB and a very flat pedestal with <5 dB variation. The research highlights the unique role of dispersion tailoring in achieving a broad and flat supercontinuum generation, making it highly desirable for various applications.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Vasilii Voropaev, Shangran Xie, Aleksandr Donodin, Daniil Batov, Mikhail Tarabrin, Johann Troles, Vladimir Lazarev
Summary: Researchers have successfully generated octave-spanning supercontinuum in As2S3-silica hybrid nanospike waveguides using a thulium-doped all-fiber femtosecond laser and amplifier system at a wavelength of 1.9 μm. The widest supercontinuum was obtained in the wavelength range of 1.1-2.5 μm, and it exhibited coherent characteristics throughout the entire spectral range, making it suitable for creating a self-referenced laser comb.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Ming-Hsiung Wu, Yan-Jou Lin, Fredrik Laurell, Yen-Chieh Huang
Summary: The researchers successfully generated a visible and near-infrared super-continuum in a monolithic KTP crystal using a high-gain, ultra-broadband Raman oscillator. By maximizing Raman gain and aligning Stokes polarization perpendicular to the plane of reflections, the oscillator produced quasi-mode-locked Stokes pulses across the visible and near-infrared spectra.
Article
Engineering, Electrical & Electronic
Xin Tong, Henan Liu, Guifang Li, Lin Zhang
Summary: The study introduces an integrated waveguide optical tweezer design that achieves focusing of upward radiation through etched trenches on a waveguide. Optimization of the antenna's structural parameters generates a quasi-Gaussian field distribution above the antenna. The gradient distribution of the electric field produces gradient force, enabling effective optical trapping of microscale particles.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Optics
Kangjun Zhao, Chenxin Gao, Xiaosheng Xiao, Changxi Yang
Summary: This study reveals the collision dynamics of vector solitons in a dual-comb fiber laser, capturing real-time spectral evolutions and extreme collisions with strong four-wave mixing sidebands. Experimental and numerical evidences provide insight into nonlinear dynamics in fiber lasers and potential improvements for laser performance in dual-comb spectroscopy applications.
PHOTONICS RESEARCH
(2021)
Article
Engineering, Electrical & Electronic
Kangjun Zhao, Xiaosheng Xiao, Changxi Yang
Summary: This paper numerically investigates the soliton dynamics in mode-locked fiber lasers based on sinusoidal spectral filtering (SSF). It is found that SSF can facilitate the formation of dual-wavelength mode locking and generate dual-comb solitons with slightly different group velocities. Moreover, pulse shaping based on SSF and gain filtering leads to a non-monotonic relationship between the group velocity difference of the solitons and the cavity gain. Additionally, dual-comb soliton mode locking exhibits a threshold feature and multi-pulse instability.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Zhi Cheng, Xin Tong, Lin Zhang
Summary: Near-field optical tweezers integrated on a chip are gaining attention for biological and chemical analyses. A low-loss Si waveguide with a high intensity gradient in the electric field is proposed for trapping microparticles. The device has high transmittance and the ability to analyze optical forces in all three dimensions.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Feng Gao, Jianwei Mu, Xiangyu Han, Yiheng Yang, Junwu Zhou
Summary: The paper proposes an improved genetic algorithm-based evolution test to accelerate the evaluation of performance limits in autonomous driving, and measures the scenario complexity through the Analytic Hierarchy Process.
AUTOMOTIVE INNOVATION
(2022)
Article
Engineering, Electrical & Electronic
Weicheng Chen, Rongxiang Guo, Dian Wan, Tarun Sharma, Lin Zhang, Tiegen Liu, Zhenzhou Cheng
Summary: On-chip Kerr frequency combs provide unprecedented opportunities for optical communications and optical interconnects with compact, low-cost, and high-density wavelength-division multiplexing (WDM) techniques. A dual-mode Kerr frequency comb based on a graphene-on-silicon (GOS) microring is proposed to overcome the limitation of traditional approaches and achieve high-speed optical communications.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Optics
Kewei Liu, Shunyu Yao, Yulei Ding, Zihao Wang, Yanan Guo, Jianchang Yan, Junxi Wang, Changxi Yang, Chengying Bao
Summary: In this study, we measured the fundamental linewidth of a laser in high-quality crystalline microcavities, and found an inverse relationship with the emission power. We also derived the limit of the fundamental linewidth, independent of the Q-factor. These findings are important for the development of highly coherent chip-based lasers.
Article
Optics
Bo Cao, Chenxin Gao, Yihang Ding, Xiaosheng Xiao, Changxi Yang, Chengying Bao
Summary: In this study, we report self-starting spatiotemporal mode-locking (STML) in a multi-mode Mamyshev oscillator without active assistance. Stable STML can be attained by increasing the filter separation.
Article
Engineering, Electrical & Electronic
Xiushan Du, Yuke Zhai, Leonardo Midolo, Lin Zhang, Xiaoyan Zhou
Summary: This paper proposes a method for efficient frequency conversion using a nanomechanical silicon-rich nitride waveguide device, to address the frequency conversion challenge in on-demand single-photon sources. Numerical results show that optimal conversion efficiency over 99% and high signal-to-noise ratio can be achieved when the waveguide loss is negligible.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Chenxin Gao, Bo Cao, Yihang Ding, Xiaosheng Xiao, Dali Yang, Hongyang Fei, Changxi Yang, Chengying Bao
Summary: Spatiotemporal mode-locking (STML) has been extended into spatiotemporal dissipative solitons in multi-mode fiber (MMF) lasers. Previous STML in MMF lasers used graded-index (GRIN) MMFs. This study presents experimental and numerical observation of STML in an all-step-index (STIN) MMF laser, and proposes a mother-child coupling mechanism to understand the walk-off between mode-resolved pulses. The work enriches MMF laser architectures for STML in a previously unexplored parameter regime.
Article
Engineering, Electrical & Electronic
Wenpu Geng, Yuxi Fang, Yingning Wang, Zhi Wang, Yan-ge Liu, Lin Zhang, Changjing Bao, Yongxiong Ren, Zhongqi Pan, Yang Yue
Summary: In this study, a dual concentric-ring-core fiber design was proposed to achieve near-zero and flat dispersion profiles over a 3007-nm wavelength range with four zero-dispersion wavelengths for the OAM mode. The precise position of the zero-dispersion wavelengths can be tailored by varying the structural variables and the germanium-doped concentration of the silica-based fiber. Simulation results showed that by pumping a 50-fs 600-kW Gaussian pulse at the central wavelength of 1900 nm into a 2-mm designed fiber, the OAM(3,1) mode supercontinuum spectrum can achieve beyond three-octave spanning from 445 to 3942 nm at -40 dB level. By further optimizing the proposed fiber structure for the OAM(1,1) mode with <60 ps/(nm.km) dispersion variation over a 3210-nm bandwidth, the generated supercontinuum can cover nearly three octaves.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Bingqian Zhou, Kuikui Fan, Jingjing Guo, Jiesi Feng, Changxi Yang, Yulong Li, Songhai Shi, Lingjie Kong
Summary: In vivo detection of neurochemicals is crucial for understanding brain mechanisms and diagnosing brain diseases. However, current sensors lack high specificity for real-time monitoring. In this study, fiber-optic probes based on engineered cells (FOPECs) were developed for plug-and-play, real-time detection of neurochemicals in freely moving animals. FOPECs demonstrated unprecedented chemical specificity and could be widely used in vertebrates without viral infection. They also showed potential for monitoring drug metabolisms in vivo.
Article
Optics
Rui Duan, Yi Tian Thung, Zitong Zhang, Emek Goksu Durmusoglu, Yichen He, Lian Xiao, Calvin Xiu Xian Lee, Wen Siang Lew, Lin Zhang, Hanyang Li, Jun Yang, Hilmi Volkan Demir, Handong Sun
Summary: Soft matter-based microlasers, with their flexibility and functional network topology, are considered as excellent building blocks for photonic interconnected networks. However, challenges like poor lasing stability and high lasing threshold hinder their potential. In this study, a high-quality, low-threshold nanoplatelets-based polymer microfiber laser and its photonic interconnected networks are successfully demonstrated. The work pioneers the exploration of polygonal self-coupling microlasers and provides insights for unit design and programming in future photonic network systems.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Biomedical
Shasha Yuan, Jianwei Mu, Weidong Zhou, Ling-Yun Dai, Jin-Xing Liu, Juan Wang, Xiang Liu
Summary: An automatic seizure detection method based on kernel-based robust probabilistic collaborative representation (ProCRC) and graph-regularized non-negative matrix factorization (GNMF) is proposed in this work. The method achieves high sensitivity and specificity by preprocessing and dimension reduction of EEG signals, and using robust ProCRC for representing test samples.
IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING
(2022)
Article
Optics
Bo Cao, Kangjun Zhao, Chenxin Gao, Xiaosheng Xiao, Chengying Bao, Changxi Yang
Summary: This study presents a comprehensive investigation of pulsating dissipative solitons (DSs) in an ytterbium Mamyshev oscillator (MO) through experimental and numerical methods. By reducing the filter separation, pulsation in both single-pulse and DS molecule states is observed, with the output pulse energy varying up to 40 times in the MO. Additionally, pulsation lasting 9 round trips, soliton explosion, and even chaotic pulsation state are observed. Numerical simulations based on a lumped vector model agree qualitatively with the experimental observations.
