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Cascaded four-wave mixing all-optical wavelength converter based on highly nonlinear fiber deposited graphene oxide

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Journal of Materials Science & Technology 2024年第4期171卷 10-15页

作者： Yuanhongliu Gao Xiaoyu Chen Tonglei Cheng Fang Wang Xin Yan College of Information Science and Engineering State Key Laboratory of Synthetical Automation for Process IndustriesNortheastern UniversityShenyang 110819China

The all-optical wavelength conversion using cascaded four-wave mixing(FWM)phenomena with graphene oxide(GO)and a highly nonlinear fiber(HNLF)device is demonstrated experimentally.GO has a strong third-order nonlinear effect and is an excellent nonlinear optical material for nonlinear optical wavelength conversion.The group velocity matching of pump and signal,HNLF,and GO amplification promote the cascaded nonlinear frequency mixing process.From the experimental and analytical results,the maximum spacing between signal and pump is 21 nm,and specifically,the order of cascaded FWM light increases from order 1 to order 2 with increasing GO,and the first-order FWM conversion effi-ciency increases to a maximum of−14.5 dB.To the best of our knowledge,this is the first time that cascaded FWM-based all-optical wavelength conversion in HNLF-GO with wide wavelength selectivity is investigated with combined pump and signal light.Our findings not only provide an effective method for achieving all-optical wavelength conversion in cascaded FWM but also offer the possibility of fabricating high-performance nonlinear optical devices.

关键词： four-wave mixing Graphene oxide Highly nonlinear fiber Optical wavelength conversion

Effects of cross-Kerr coupling on transmission spectrum of double-cavity optomechanical system

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Chinese Physics B 2024年第6期33卷 390-396页

作者：陈立滕秦立国田立君黄接辉周南润龚尚庆 School of Mathematics Physics and StatisticsShanghai University of Engineering ScienceShanghai 201620China Department of Physics Shanghai UniversityShanghai 200444China School of Electrical Engineering Shanghai University of Engineering ScienceShanghai 201620China School of Physics East China University of Science and TechnologyShanghai 200237China

We theoretically study the transmission spectrum of the cavity field in a double-cavity optomechanical system with cross-Kerr(CK) effect. The system consists of two tunneling coupling optomechanical cavities with a mechanical resonator as a coupling interface. By doping CK medium into the mechanical resonator, CK couplings between the cavity fields and the mechanical resonator are introduced. We investigate the effects of CK coupling strength on the transmission spectrum of the cavity field, including the transmission rate, nonreciprocity and four-wave mixing(FWM). We find that the transmission spectrum of the probe field can show two obvious transparent windows, which can be widened by increasing the CK coupling strength. For the transmission between the two cavity fields, the perfect nonreciprocity and reciprocity are present and modulated by CK coupling and phase difference between two effective optomechanical couplings. In addition, the effects of the optomechanical and CK couplings on FWM show that the single peak of FWM is split into three symmetrical peaks due to the introduction of the CK effect.

关键词： cross-Kerr transmission rate nonreciprocity four-wave mixing

D-Shaped Tellurite Photonic Crystal Fiber Hydrogen and Methane Sensor Based on four-wave mixing With SPR Effect

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Photonic Sensors 2023年第1期13卷 25-39页

作者： Hai LIU Bo WU Cong CHEN Benlei ZHAO Xu ZHANG Hancheng ZHANG School of Information and Control Engineering China University of Mining and TechnologyXuzhou 221116China Engineering Research Center of Intelligent Control for Underground Space(Ministry of Education) China University of Mining and TechnologyXuzhou 221116China

A new D-shaped tellurite photonic crystal fiber sensor based on the four-wave mixing(FWM)effect with the surface plasmon resonance(SPR)effect is designed and optimized.The substrate of the D-shaped photonic crystal fiber(D-PCF)is tellurite glass,and the polished surface is plated with the gold film and hydrogen gas-sensitive film.An air hole of the inner cladding,which is plated with the gold film and methane gas-sensitive film,is selected as the second sensing channel to simultaneously measure the concentration of hydrogen and methane.Based on the four-wave mixing,the wavelength shifts of the Stokes and anti-Stokes spectra resulting from the variation of the gas concentration can be used to accurately detect the concentrations of methane and hydrogen.Meanwhile,it is found that the SPR effect can increase the wavelength shifts,which means the sensitivity of methane and hydrogen augment.After parameter optimization,the maximum sensitivities of methane and hydrogen are 4.03 nm/%and-14.19 nm/%,respectively.Both the linearities are up to 99.9%.The resolution of methane is 1.25×10^(-2)%and hydrogen is 7.14×10^(-3)%.Moreover,the fiber length of this sensor is only 20mm,which is conducive to the construction of a compact or ultra-compact embedded FWM fiber sensor.

关键词： four-wave mixing surface plasmon resonance D-shaped photonic crystal fiber gas sensing

Quantum squeezing enhancement based on phase-sensitive cascaded four-wave mixing processes

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Science China(Physics,Mechanics & Astronomy) 2023年第5期66卷 73-78页

作者： Yanbo Lou Yingxuan Chen Jiabin Wang Shengshuai Liu Jietai Jing State Key Laboratory of Precision Spectroscopy Joint Institute of Advanced Science and TechnologySchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200062China CAS Center for Excellence in Ultra-intense Laser Science Shanghai 201800China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Quantum squeezing is an important quantum resource for quantum metrology as it can improve the measurement precision.By enhancing the quantum squeezing level,the measurement precision can be further improved.Here,we experimentally implement quantum squeezing enhancement based on phase-sensitive cascaded four-wave mixing(CFWM)processes.The intensitydifference squeezing(IDS)between the two outputs of the phase-sensitive CFWM processes is enhanced to about 7.42 dB compared with IDS generated by the single four-wave mixing(FWM)process(about 3.31 or 4.01 dB).Such enhancement is enabled by both the intrinsic interference nature of phase-sensitive CFWM processes and the contribution of more gain from the two FWM processes.In addition,we measure IDS levels generated by phase-sensitive CFWM processes at different internalphase-locking points,which shows that the internal phase plays an important role in IDS enhancement.Our scheme provides a new method for improving the degree of IDS and may find potential applications in enhancing the measurement precision in quantum metrology.

关键词： quantum optics quantum squeezing four-wave mixing

Numerical analysis of four-wave-mixing based multichannel wavelength conversion techniques in fibers

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Journal of Semiconductors 2009年第5期30卷 55-59页

作者：贾亮张帆李明刘育梁陈章渊 Optoelectronic System Laboratory Institute of SemiconductorsChinese Academy of Sciences State Key Laboratory of Advanced Optical Communication Systems & Networks School of Electronics Engineering and Computer SciencePeking University

We numerically investigate four-wave-mixing （FWM） based multichannel wavelength conversion for amplitude-modulated signals, phase-modulated signals, together with mixed amplitude and phase modulated signals. This paper also discusses the influence of stimulated Brillouin scattering （SBS） effects on high-efficiency FWM-based wavelength conversion applications. Our simulation results show that DPSK signals are more suitable for FWM-based multichannel wavelength conversion because the OOK signals will suffer from the inevitable data- pattern-dependent pump depletion. In future applications, when the modulation format is partially upgraded from OOK to DPSK, the influence of OOK signals on the updated DPSK signals must be considered when using multi-channel wavelength conversion. This influence becomes severe with the increase of OOK channel number. It can be concluded that DPSK signals are more appropriate for both transmission and multichannel wavelength conversion, especially in long haul and high bit-rate system.

关键词： stimulated Brillouin scattering wavelength conversion four-wave mixing nonlinear optics

Enhancement and suppression of spatial splitting four-wave mixing in atomic medium

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Chinese Physics B 2012年第2期21卷 309-316页

作者：庄雨茗桑苏玲李培英袁晨智霍淑利薛鑫鑫王志国郑淮斌张彦鹏 Key Laboratory for Physical Electronics and Devices of the Ministry of Education&Shaanxi Key Laboratory of Information Photonic Technique Xi'an Jiaotong UniversityXi'an 710049China School of Physics and Information Technology Ningxia Teachers UniversityGuyuan 756000China

We experimentally report on the evolution from singly-dressed to doubly-dressed four-wave mixing （FWM） process by controlling the powers of the probe, the pump and the dressing fields respectively. The differences in the enhancement and the suppression of FWM signal between the two-level and cascade three-level atomic systems are observed and explained by the multi-dressed effect theoretically. Both the x direction and the y direction spatial splittings of the degenerate-FWM （DWFM） beams are obtained. We also investigate the switch between the enhancement and the suppression of the DWFM signals and between its spatial splittings in x direction and y direction. The spatial splittings in x direction and y direction can be controlled by the relative position and the intensity of the involved laser beams. Such a study can be useful for optimizing the efficiency of the FWM process and providing potential applications in spatial signal processing.

关键词： four-wave mixing spatial splitting enhancement suppression

wavelength dependence four-wave mixing spectroscopy in a micrometric atomic vapour

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Chinese Physics B 2010年第9期19卷 297-302页

作者：李院院李莉张彦鹏毕思文 Institute of Optics&Electronics Department of PhysicsXi'an University of Arts and Science State Key Laboratory of Transient Optics and Technology Xi'an Institute of Optics and Precision MechanicsChinese Academy of Sciences Key Laboratory for Physical Electronics and Devices of the Ministry of Education Xi'an Jiaotong University

This paper presents a theoretical study of wavelength dependence four-wave-mixing （FWM） spectroscopy in a micrometric thin atomic vapour. It compares three cases termed as mismatched case I, matched case and mismatched case II for the probe wavelength less, equal and greater than the pump wavelength respectively. It finds that Dicke- narrowing can overcome width broadening induced by Doppler effects and polarisation interference of thermal atoms, and high resolution FWM spectra can be achieved both in matched and mismatched wavelength for many cases. It also finds that the magnitude of the FWM signal can be dramatically modified to be suppressed or to be enhanced in comparison with that of matched wavelength in mismatched case I or II. The width narrowing and the magnitude suppression or enhancement can be demonstrated by considering enhanced contribution of slow atoms induced by atom-wall collision and transient effect of atom-light interaction in a micrometric thin vapour.

关键词： four-wave mixing wavelength match Dicke-narrowing polarisation interference

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 level.To 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 nonlinearity.By 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 resonators.This 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

Phase-matching analysis of four-wave mixing induced by modulation instability in a single-mode fiber

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Chinese Physics B 2012年第9期21卷 332-337页

作者：陈伟孟洲周会娟 Department of Optic Information Science and Technology College of Optoelectronic Science and EngineeringNational University of Defense Technology

four-wave mixing induced by modulation instability in a single-mode fiber is analyzed from the phase-matching point of view. For the two-channel transmission, a method is proposed to select the four-wave-mixing-induced sidebands, which is based on the proper use of a continuous-wave and a pulse as light sources. We find that a mass of sidebands are generated in the modulation instability resonance region, and the power of the sideband increases with not only the peak power of the pump pulse but also the continuous-wave power which acts as a seed. The research will provide guidance for fiber communication and sensing systems using wavelength division multiplexing technology.

关键词： four-wave mixing modulation instability phase matching