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Transition from backward to sideward stimulated Raman scattering with broadband lasers in plasmas

Matter and Radiation at Extremes 2023年第6期8卷 63-73页

作者： X.F.Li S.M.Weng p.gibbon H.H.Ma S.H.Yew Z.Liu Y.Zhao M.Chen Z.M.Sheng J.Zhang Key Laboratory for Laser plasmas(MoE) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghai 200240China Institute for Advanced Simulation Jülich Supercomputing CentreForschungszentrum Jülich52425 JülichGermany Centre for Mathematical plasma Astrophysics Katholieke Universiteit Leuven3000 LeuvenBelgium Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China School of Science Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China

Broadband lasers have been proposed as future drivers of inertial confined fusion(ICF)to enhance the laser-target coupling efficiency via the mitigation of various parametric *** physical mechanisms involved have been explored recently,but are not yet fully ***,stimulated Raman scattering(SRS)as one of the key parametric instabilities is investigated theoretically and numerically for a broadband laser propagating in homogeneous plasma in multidimensional *** linear SRS growth rate is derived as a function of scattering angles for two monochromatic laser beams with a fixed frequency differenceδω.Ifδω/ω_(0)∼1%,withω0 the laser frequency,these two laser beams may be decoupled in stimulating backward SRS while remaining coupled for sideward SRS at the laser intensities typical for ***,side-scattering may dominate over backward SRS for two-color laser *** finding of SRS transition from backward to sideward SRS is then generalized for a broadband laser with a few-percent ***-in-cell simulations demonstrate that with increasing laser bandwidth,the sideward SRS gradually becomes dominant over the backward *** sideward SRS is very efficient in producing harmful hot electrons,attention needs to be paid on this effect if ultra-broadband lasers are considered as next-generation ICF drivers.

关键词： scattering backward Transition

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Mitigating parametric instabilities in plasmas by sunlight-like lasers

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Matter and Radiation at Extremes 2021年第5期6卷 54-61页

作者： H.H.Ma X.F.Li S.M.Weng S.H.Yew S.Kawata p.gibbon Z.M.Sheng J.Zhang Key Laboratory for Laser plasmas(MoE) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghai 200240China Graduate School of Engineering Utsunomiya UniversityYohtoh 7-1-2Utsunomiya 321-8585Japan Institute for Advanced Simulation J¨ulich Supercomputing CentreForschungszentrum J¨ulich52425 J¨ulichGermany Centre for Mathematical plasma Astrophysics Katholieke Universiteit Leuven3000 LeuvenBelgium SUpA Department of PhysicsUniversity of StrathclydeGlasgow G40NGUnited Kingdom Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China

Sunlight-like lasers that have a continuous broad frequency spectrum,random phase spectrum,and random polarization are formulated *** a sunlight-like laser beam consisting of a sequence of temporal speckles,the resonant three-wave coupling that underlies parametric instabilities in laser–plasma interactions can be greatly degraded owing to the limited duration of each speckle and the frequency shift between two adjacent *** wave coupling can be further weakened by the random polarization of such *** simulations demonstrate that the intensity threshold of stimulated Raman scattering in homogeneous plasmas can be doubled by using a sunlight-like laser beam with a relative bandwidth of∼1%as compared with a monochromatic laser ***,the hot-electron generation harmful to inertial confinement fusion can be effectively controlled by using sunlight-like laser *** drivers may be realized in the next generation of broadband lasers by combining two or more broadband beams with independent phase spectra or by applying polarization smoothing to a single broadband beam.

关键词： polarization scattering speckle

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High-speed ultra-wideband wireless signals over fiber systems:photonic generation and DSp detection

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The Journal of China Universities of posts and Telecommunications 2009年第4期16卷 7-11页

作者： Timothy Braidwood gibbon Idelfonso Tafur Monroy DTU Fotonik-Department of photonics Engineering Technical University of Denmark

We firstly review the efforts in the literature on ultra-wideband （UWB）-over-fiber systems. Secondly, we present experimental results on photonic generation of high-speed UWB signals by both direct modulation and external optical injecting an uncooled semiconductor laser. Furthermore, we introduce the use of digital signal processing （DSp） technology to receive the generated UWB signal at 781.25 Mbit/s. Error-free transmission is achieved.

关键词： UWB-over-fiber photonic generation DSp

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Ground and flight tests of AlSat-1B butane propulsion system

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propulsion and power Research 2022年第1期11卷 74-84页

作者： D.Darfilala D.gibbon Satellite Development Center CDS Algerian Space Agency ASALBP 4065Ibn Rochd USTOOran31130Algeria Surrey Satellite Technology Ltd. GuildfordSurrey GU27YEUnited Kingdom

On September 26,2016 Algerian Space Agency launched AlSat-1B,the second in a series of medium resolution earth observation satellites ***-1B electro-thermal propulsion system follows the classic design principle that has been used on previous SSTL-100 *** a total dry weight of 5.17 kg,the system is filled with 2.35 L selfpressurized *** thruster assembly is designed to use 15 W(at 28 V)redundant heater elements,it is designed to have an average mission thrust of 50 *** a warm up time of 10 min,the temperature of the butane will be increased by over 250℃.This is the equivalent of about 35%gain in specific impulse over ambient temperature *** spacecraft dry weigh at launch site was 107 kg,the propulsion system is designed to provide at least 19 m/s Delta-v to meet the spacecraft’s mission *** investigate the system readiness for flight,a series of performance tests have been completed at the Surrey Satellite Technology Ltd laboratories(United Kingdom),Satellite Development Centre(Algeria)and Satish Dhawan Space Centre rocket launch site(India),the results of these tests as well as initial flight test results are presented in this paper.

关键词： Space propulsion Butane Resistojet Heaters Specific impulse

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Real-time wavelength routing based on Bragg reflection with integrated forward Raman for long-reach networks

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Optoelectronics Letters 2020年第1期16卷 40-44页

作者： G.M.Isoe T.B.gibbon South African Radio Astronomy Observatory(SARAO) Cape Town 7925South Africa Centre for Broadband Communication Nelson Mandela UniversityPort Elizabeth 6031South Africa

We experimentally demonstrate the all-optical efficient technique for dynamic full-duplex wavelength routing and reach extension through adoption of passive fibre Bragg grating(FBG),energy efficient vertical cavity surface emitting lasers(VCSELs)and high gain forward Raman *** this study,two VCSEL channels at 1549.62 nm and 1550.01 nm are directly modulated with a 8.5 Gbit/s data signal each,and transmitted over 25.5 km fibre to a passive single mode FBG-based wavelength routing *** precise wavelength selectivity of the FBG is exploited to achieve all-optical real-time wavelength routing of the 1549.62 nm VCSEL channel with a maximum insertion loss of 22.1 *** 1550.01 nm channel is transmitted through the FBG with a maximum penalty of 1.03 *** utilizing the 7.2 dB flat gain of a forward Raman pump,the routed 1549.62 nm VCSEL channel is transmitted over 76.7 km fibre with a maximum penalty of 3.84 dB at bit error rate(BER)of *** technique is all-optical,power efficient as it employs passive FBG and circulators and has low cross talk allied to precise wavelength selectivity of the technique.

关键词： passive pump fibre

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Inherent EDFA cross-gain saturation functionality for 17 Gbit/s pAM-3 all-optical wavelength reuse pON

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Optoelectronics Letters 2020年第2期16卷 122-125页

作者： G.M.Isoe T.B.gibbon South African Radio Astronomy Observatory(SARAO) Cape town 7925South Africa Centre for Broadband Communication Nelson Mandela UniversityPort Elizabeth 6031South Africa

In this work, inherent data-erasing functionality of a saturated erbium doped fibre amplifier(EDFA) is exploited to achieve an all-optical wavelength reuse with pulse amplitude modulation(pAM) format. A 10 GHz bandwidth distributed feedback laser(DFB) is directly modulated with 17 Gbit/s pAM-3 data signal and transmitted downstream over a 26.58 km fibre optical line terminal(OLT) incurring a maximum penalty of 1.81 d B. A saturated EDFA deployed at the optical network unit(ONU) terminal is utilized to optically suppress the extinction ratio of residual 17 Gbit/s pAM-3 downstream data significantly from 7.1 d B to 830 md B. This facilitates direct reuse of the downstream carrier without the need for an additional electrical data eraser. With the all optical data erasing capability of EDFA over-10 d Bm input power, the carrier re-used upstream transmission successfully delivers 17 Gbit/s pAM-3 data with a maximum transmission penalty of 0.99 d B. pAM-3 modulation format maximizes network efficiency by doubling the transmitted bits per symbol. Our technique is all-optical, it can support ultrafast systems with higher modulation formats and is power efficient.

关键词： EDFA network amplifier

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Handbook of standards and resources for spoken language systems

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1997年

作者： gibbon Dafydd

来源：畅想之星图书光盘版（南... 评论

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Transmission of precise phase coherent optical signals using a VCSEL stabilization system

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Optoelectronics Letters 2019年第3期15卷 200-203页

作者： Shukree Wassin George Isoe Andrew Leitch Tim gibbon Centre for Broadband Communication Physics DepartmentNelson Mandela University

To improve the time and frequency reference standards used for radio astronomy and high precision atomic physics applications, we describe a novel stable frequency transmission technique. The approach uses a vertical-cavity surface-emitting laser(VCSEL) based phase correction actuator. Using a frequency mixing process for feedback control, the phase noise induced along the 26 km G.655 optical fibre link was actively reduced. This was achieved by using a 1 310 nm dither controlled VCSEL phase error correction actuator together with the inherent chromatic dispersion properties of the fibre. The technique corrects phase noise and optical signal drift along the fibre at the transmission end. Fractional frequency instabilities across the G.655 fibre link of 4.44×10-12 at 1 s and 4.86×10-14 at 104 s are successfully reported.

关键词： VCSEL Transmission of precise phase coherent optical signals using a VCSEL stabilization system

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A review of experimental design in forensic taphonomy:moving towards forensic realism

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Forensic Sciences Research 2020年第4期5卷 249-259页

作者： Kelly L.Miles Devin A.Finaughty Victoria E.gibbon Department of Biology University of New BrunswickFrederictonNBCanada School of Anthropology and Conservation University of KentCanterburyUK Department of Human Biology University of Cape TownCape TownWCSouth Africa

Forensic taphonomy as a discipline requires standardization to satisfy Daubert criteria for sci-entific data to be admissible in *** response,there has been a shift towards quantifica-tion of methodology and estimating the postmortem *** these advances,there are still biases and limitations within the discipline not explicitly addressed in the early stages of experimental design nor in final published *** this article,unresolved debates with respect to the conductance and reporting of forensic taphonomic research are reviewed,beginning with the nature of experimental cadavers,human or animal analogues and their body size,and second,the forensic realism of experimental setups,specifically with respect to caging,clothing and number of ***,albeit imperfect,are a good model to gain a general idea of the trends that may be seen in humans in subsequent validation studies in facilities where human donors are *** date,there is no consen-sus among taphonomists on the extent of the effect that body mass has on decomposition *** research is required with both human cadavers and non-human analogues that builds on our current knowledge of forensic taphonomy to answer these nagging *** will enable the discipline to make the reliable assumption that pigs and donor decomposition data can be applied to homicide cases.A suite of experimental design aspects is suggested to ensure systematic and standardized data collection across differ-ent biogeoclimatic circumstances to identify and quantify the effects of potential confounding *** studies in multiple,varied biogeographic circumstances with standardized protocols,equipment and carrion will facilitate independent global validation of *** factors are reviewed to show the need for adjustments in experimental design to ensure relevance and applicability of data within locally realistic forensic *** initiation of a global decomposition data

关键词： Forensic sciences forensic taphonomy decomposition Daubert standard exclusion cages clothed pigs carrion biomass scavenging

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VCSEL wavelength reuse for intrinsically bidirectional data traffics in next generation GpONs

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Optoelectronics Letters 2019年第5期15卷 360-362页

作者： G.M.Isoe S.Wassin T.B.gibbon Centre for Broadband Communication Nelson Mandela University

An all-optical wavelength reuse technique employing cost effective power efficient vertical surface emitting laser(VCSEL) is proposed to address uplink data streaming from end-users by exploiting the same wavelength assigned to them. A saturated optical erbium-doped optical fiber amplifier(EDFA) is adopted to erase a directly modulated 10 Gbit/s data from an incoming downstream wavelength. We show that with EDFA saturation, the extinction ration of the incoming wavelength is reduced to less than 1 d Bm, therefore allowing for wavelength re-modulation. A receiver sensitivity of -19.65 d Bm and -17.86 d Bm is attained for downstream and upstream data signals respectively. A total of 24.7 km single mode fibre transmission is attained experimentally. This technique opens new perspectives towards development of efficient spectrum utilization for application in wavelength flexible optical networks with non-static flex-spectrum grids.

关键词： VCSEL erbium-doped optical fiber amplifier(EDFA) intrinsically bidirectional

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