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Scalable parallel ultrafast optical random bit generation based on a single chaotic microcomb

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Light(Science & Applications) 2024年第4期13卷 637-644页

作者： Pu Li Qizhi Li Wenye Tang Weiqiang Wang Wenfu Zhang brent elittle Sai Tek Chu KAlan Shore Yuwen Qin Yuncai Wang Institute of Advanced Photonics Technology School of Information EngineeringGuangdong University of TechnologyGuangzhou 51006China. Key Laboratory of Photonic Technology for Integrated Sensing and Communication Ministry of Education of ChinaGuangdong University of TechnologyGuangzhou 51006China. Guangdong Provincial Key Laboratory of Information Photonics Technology Guangdong University of TechnologyGuangzhou 51006China. Key Laboratory of Advanced Transducers andIntelligent Control System Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China. State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China. Department of Physics and Materials Science City University of Hong KongHong KongChina. School of electronic engineering Bangor UniversityBangorWales LL571UTUK

Random bit generators are critical for information security,cryptography,stochastic modeling,and *** and scalability are key challenges faced by current physical random bit ***,we propose a massively parallel scheme for ultrafast random bit generation towards rates of order 100 terabit per second based on a single micro-ring resonator.A modulation-instability-driven chaotic comb in a micro-ring resonator enables the simultaneous generation of hundreds of independent and unbiased random bit streams.A proof-of-concept experiment demonstrates that using our method,random bit streams beyond 2 terabit per second can be successfully generated with only 7 comb *** bit rate can be easily enhanced by further increasing the number of comb lines *** approach provides a chip-scale solution to random bit generation for secure communication and high-performance computation,and offers superhigh speed and large scalability.

关键词： resonator random chaotic

Four-wave mixing in silicon-nanocrystal embedded high-index doped silica micro-ring resonator

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Journal of Semiconductors 2021年第4期42卷 104-110页

作者： Yuhua Li Xiang Wang Roy Davidson brent e.little Sai Tak Chu Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018China Department of Physics City University of Hong KongHong Kong 999077China QXP Technology Inc. Xi’an 710119China State Key Laboratory of Transient Optics and Photonics XIOPMCASXi’an 710119China

A nonlinear integrated optical platform that allows the fabrication of waveguide circuits with different material composition,and at small dimensions,offers advantages in terms of field enhancement and increased interaction length,thereby facilitating the observation of nonlinear optics effects at a much lower power *** enhance the nonlinearity of the conventional waveguide structure,in this work,we propose and demonstrate a microstructured waveguide where silicon rich layer is embedded in the core of the conventional waveguide in order to increase its *** embedding a 20 nm thin film of silicon nanocrystal(Si-nc),we achieve a twofold increase of the nonlinear parameter,γ.The linear relationship between the fourwave mixing conversion efficiency and pump power reveals the negligible nonlinear absorption and small dispersion in the micro-ring *** simple approach of embedding an ultra-thin Si-nc layer into conventional high-index doped silica dramatically increases its nonlinear performance,and could potentially find applications in all-optical processing functions.

关键词： four-wave mixing silicon nanocrystal high-index doped silica micro-ring resonator

Self-locked orthogonal polarized dual comb in a microresonator

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Photonics Research 2018年第5期6卷 363-367页

作者： WeIQIANG WANG WeNFU ZHANG ZHIZHOU LU SAI T.CHU brent e.little QINGHUA YANG LeI WANG WeI ZHAO State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision Mechanics(XIOPM)Chinese Academy of Sciences(CAS)Xi'an 710119China University of Chinese Academy of Sciences Beijing 100049China Department of Physics and Materials Science City University of Hong KongHong KongChina School of Physics and Optoelectronic engineering Xidian UniversityXi'an 710071China

Dual combs are an emerging tool to obtain unprecedented resolution, high sensitivity, ultrahigh accuracy, broad bandwidth, and ultrafast data updating rate in the fields of molecular spectroscopy, optical metrology, as well as optical frequency synthesis. The recent progress in chip-based microcombs has promoted the on-chip dual-comb measuring systems to a new phase attributed to the large frequency spacing and broad spectrum. In this paper, we demonstrate proof-of-concept dual-comb generation with orthogonal polarization in a single microresonator through pumping both the transverse-electric （Te） and transverse-magnetic （TM） modes simultaneously. The two orthogonal polarized pumps are serf-oscillating in a fiber ring cavity. The generated dual comb exhibits excellent stability due to the intrinsic feedback mechanism of the sdf-locked scheme. The repetition rate of the two orthogonal combs is slightly different because of the mode spacing difference between the Te and TM modes. Such orthogonal polarized dual-combs could be a new comb source for out-of-lab applications in the fields of integrated spectroscopy, ranging measurement, optical frequency synthesis, and microwave comb generation.

关键词： Self-locked orthogonal polarized dual comb a microresonator

Photonic radio frequency channelizers based on Kerr optical micro-combs

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Journal of Semiconductors 2021年第4期42卷 17-32页

作者： Mengxi Tan Xingyuan Xu Jiayang Wu Thach G.Nguyen Sai T.Chu brent e.little Roberto Morandotti Arnan Mitchell David J.Moss Optical Sciences Centre Swinburne University of TechnologyHawthornVIC 3122Australia electro-Photonics Laboratory Department of Electrical and Computer Systems EngineeringMonash UniversityVIC3800Australia School of engineering RMIT UniversityMelbourneVIC 3001Australia Department of Physics City University of Hong KongHong KongChina State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision MechanicsChinese Academy of ScienceXi'an 710119China INRS-Énergie Matériaux et Télécommunications1650 Boulevard Lionel-BouletVarennesQuébecJ3X 1S2Canada Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China

We review recent work on broadband RF channelizers based on integrated optical frequency Kerr micro-combs combined with passive micro-ring resonator filters,with microcombs having channel spacings of 200 and 49 *** approach to realizing RF channelizers offers reduced complexity,size,and potential cost for a wide range of applications to microwave signal detection.

关键词： microwave photonic signal channelization integrated optical frequency comb

Orthogonally polarized RF optical single sideband generation with integrated ring resonators

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Journal of Semiconductors 2021年第4期42卷 53-66页

作者： Mengxi Tan Xingyuan Xu Jiayang Wu Thach G.Nguyen Sai T.Chu brent e.little Arnan Mitchell Roberto Morandotti David J.Moss Optical Sciences Centre Swinburne University of TechnologyHawthornVIC 3122Australia electro-Photonics Laboratory Department of Electrical and Computer Systems EngineeringMonash UniversityVIC3800Australia School of engineering RMIT UniversityMelbourneVIC 3001Australia Department of Physics City University of Hong KongHong KongChina State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision MechanicsChinese Academy of ScienceXi'an 710119China INRS-Énergie Matériaux et Télécommunications1650 Boulevard Lionel-BouletVarennesQuébecJ3X 1S2Canada Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China

We review recent work on narrowband orthogonally polarized optical RF single sideband generators as well as dualchannel equalization,both based on high-Q integrated ring *** devices operate in the optical telecommunications C-band and enable RF operation over a range of either fixed or thermally tuneable *** operate via Te/TM mode birefringence in the *** achieve a very large dynamic tuning range of over 55 dB for both the optical carrier-to-sideband ratio and the dual-channel RF equalization for both the fixed and tunable devices.

关键词： microwave photonics micro-ring resonators radio frequency

Long-distance ranging with high precision using a soliton microcomb

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Photonics Research 2020年第12期8卷 1964-1972页

作者： JINDONG WANG ZHIZHOU LU WeIQIANG WANG FUMIN ZHANG JIAWeI CHeN YANG WANG JIHUI ZHeNG SAI T.CHU WeI ZHAO brent e.little XINGHUA QU WeNFU ZHANG State Key Laboratory of Precision Measuring Technology&Instruments Tianjin UniversityTianjin 300072China State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China University of Chinese Academy of Sciences Beijing 100049China Department of Physics and Materials Science City University of Hong KongHong KongChina

Laser-based light detection and ranging(lidar)plays a significant role in both scientific and industrial ***,it is difficult for existing lidars to achieve high speed,high precision,and long distance ***,we demonstrate a high-performance lidar based on a chip-scaled soliton microcomb(SMC)that can realize all three specialties *** by the excellent properties of ultrahigh repetition rate and the smooth envelope of the SMC,traditional optical frequency comb(OFC)-based dispersive interferometry is heavily improved and the measuring dead zone induced by the mismatch between the repetition rate of the OFC and resolution of the optical spectrum analyzer is totally *** with an auxiliary dual-frequency phase-modulated laser range finder,the none-dead-zone measurable range ambiguity is extended up to 1500 *** proposed SMC lidar is experimentally implemented in both indoor and outdoor *** the outdoor baseline field,real-time,high-speed(up to 35 k Hz)measurement of a long distance of^1179 m is achieved with a minimum Allan deviation of 5.6μm at an average time of 0.2 ms(27 nm at an average time of 1.8 s after high-pass filtering).The present SMC lidar approaches a compact,fast,high-precision,and none-dead zone long-distance ranging system,aimed at emerging applications of frontier basic scientific research and advances in industrial manufacturing.

关键词： lidar soliton high

Photonic microwave true time delays for phased array antennas using a 49 GHz FSR integrated optical micro-comb source[Invited]

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Photonics Research 2018年第5期6卷 I0055-I0061页

作者： XINGYUAN Xu JIAYANG Wu THACH G.NGUYeN TANIA MOeIN SAI T.CHU brent e.little ROBeRTO MORANDOTTI ARNAN MITCHeLL DAVID J.Moss Centre for Micro-Photonics Swinburne University of TechnologyHawthornVlC 3122Australia ARC Centre of excellence for Ultrahigh-bandwidth Devices for Optical Systems(CUDOS) RMIT UniversityMelbourneVIC 3001Australia Department of Physics and Material Science City University of Hong KongTat Chee AvenueHong KongChina State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi'an 710119China INRS-energie Materiaux et Telecommunications1650 Boulevard Lionel-BouletVarennesQuebec J3X 1S2Canada National Research University of Information Technologies Mechanics and OpticsSt.PetersburgRussia Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China

We demonstrate significantly improved performance of a microwave true time delay line based on an integrated optical frequency comb source. The broadband micro-comb(over 100 nm wide) features a record low free spectral range(FSR) of 49 GHz, resulting in an unprecedented record high channel number(81 over the C band)—the highest number of channels for an integrated comb source used for microwave signal processing. We theoretically analyze the performance of a phased array antenna and show that this large channel count results in a high angular resolution and wide beam-steering tunable range. This demonstrates the feasibility of our approach as a competitive solution toward implementing integrated photonic true time delays in radar and communications systems.

关键词： Photonic microwave true time delays for phased array antennas a 49 GHz FSR integrated optical micro-comb source

Athermal third harmonic generation in micro‐ring resonators

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Opto-electronic Advances 2020年第12期3卷 17-27页

作者： Shaohao Wang Yuhua Li brent elittle Leiran Wang Xiang Wang Roy RDavidson Sai Tak Chu FZU-Jinjiang Joint Institute of Microelectronics Jinjiang Science and Education ParkFuzhou UniversityJinjiang 362200China Department of Physics City University of Hong KongKowloon TongHong Kong 999077China State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China University of Chinese Academy of Sciences Beijing 100049China QXP Technology Xi’an 710311China Department of Microelectronics Science and Technology Qi Shan CampusFuzhou UniversityFuzhou 350108China Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018China

Nonlinear high-harmonic generation in micro-resonators is a common technique used to extend the operating range of applications such as self-referencing systems and coherent communications in the visible ***,the generated high-harmonic emissions are subject to a resonance shift with a change in *** present a comprehensive study of the thermal behavior induced phase mismatch that shows this resonance shift can be compensated by a combination of the linear and nonlinear thermo-optics *** this model,we predict and experimentally demonstrate visible third harmonic modes having temperature dependent wavelength shifts between−2.84 pm/ºC and 2.35 pm/ºC when pumped at the *** providing a new way to achieve athermal operation,this also allows one to measure the thermal coefficients and Q-factor of the visible *** steady state analysis,we have also identified the existence of stable athermal third harmonic generation and experimentally demonstrated orthogonally pumped visible third harmonic modes with a temperature dependent wavelength shift of 0.05 pm/ºC over a temperature range of 12º*** findings promise a configurable and active temperature dependent wavelength shift compensation scheme for highly efficient and precise visible emission generation for potential 2f–3f self-referencing in metrology,biological and chemical sensing applications.

关键词： third-harmonic generation thermodynamics micro-resonators

Hyperbolic resonant radiation of concomitant microcombs induced by cross-phase modulation

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Photonics Research 2023年第6期11卷 1075-1084页

作者： YANG WANG WeIQIANG WANG ZHIZHOU LU XINYU WANG LONG HUANG brent elittle SAI TCHU WeI ZHAO WeNFU ZHANG State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China University of Chinese Academy of Sciences Beijing 100049China Chongqing United Microelectronics Center(CUMeC) Chongqing 401332China Department of Physics and Materials Science City University of Hong KongHong KongChina

A high-quality optical microcavity can enhance optical nonlinear effects by resonant recirculation,which provides a reliable platform for nonlinear optics *** a soliton microcomb and a probe optical field are coexisting in a micro-resonator,a concomitant microcomb(CMC)induced by cross-phase modulation(XPM)will be formed ***,we characterize the CMC comprehensively in a micro-resonator through theory,numerical simulation,and experimental *** is found that the CMCs spectra are modulated due to resonant radiation(RR)resulting from the interaction of dispersion and XPM *** group velocity dispersion induces symmetric RRs on the CMC,which leads to a symmetric spectral envelope and a dual-peak pulse in frequency and temporal domains,respectively,while the group velocity mismatch breaks the symmetry of RRs and leads to asymmetric spectral and temporal *** the group velocity is linearly varying with frequency,two RR frequencies are hyperbolically distributed about the pump,and the probe light acts as one of the asymptotic *** results enrich the CMC dynamics and guide microcomb design and applications such as spectral extension and dark pulse generation.

关键词： resonant symmetric dispersion