简介：Four-wavemixing,aswellasitsinducedintensitynoise,isharmfultowavelengthdivisionmultiplexingsystems.Theefficiencyandtherelativeintensitynoiseoffour-wavemixingarenumericallysimulatedforthetwo-waveandthethree-wavefibertransmissions.Itisfoundthattheefficiencydecreaseswiththeincreaseofboththefrequencyspacingandthefiberlength,whichcanbeexplainedusingthequasi-phase-matchingcondition.Furthermore,therelativeintensitynoisedecreaseswiththeincreaseoffrequencyspacing,whileitincreaseswiththeincreaseoffiberlength,whichisduetotheconsiderablepowerlossofthepumplight.Thisinvestigationpresentsagoodreferenceforthepracticalapplicationofwavelengthdivisionmultiplexingsystems.

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简介：Inthispaper,weinvestigatecoherenceresonance(CR)andnoise-inducedsynchronizationinHindmarsh-Rose(HR)neuralnetworkwiththreedifferenttypesoftopologies:regular,random,andsmall-world.ItisfoundthattheadditivenoisecaninduceCRinHRneuralnetworkwithdifferenttopologiesanditscoherenceisoptimizedbyapropernoiselevel.Itisalsofoundthatascouplingstrengthincreasestheplateauinthemeasureofcoherencecurvebecomesbroadenedandtheeffectsofnetworktopologyismorepronouncedsimultaneously.Moreover,wefindthatincreasingtheprobabilitypofthenetworktopologyleadstoanenhancementofnoise-inducedsynchronizationinHRneuronsnetwork.

简介：Wereportlow-noise,high-performancesingletransversemode1.3μmInAs/GaAsquantumdotlasersmonolithicallygrownonsilicon(Si)usingmolecularbeamepitaxy.Thefabricatednarrow-ridge-waveguideFabry–Perot(FP)lasershaveachievedaroom-temperaturecontinuous-wave(CW)thresholdcurrentof12.5mAandhighCWtemperaturetoleranceupto90°C.Anultra-lowrelativeintensitynoiseoflessthan-150dB∕Hzismeasuredinthe4–16GHzrange.Usingthislow-noiseSi-basedlaser,wethendemonstrate25.6Gb/sdatatransmissionover13.5kmSMF-28.Theselow-costFPlaserdevicesarepromisingcandidatestoprovidecost-effectivesolutionsforuseinuncooledSiphotonicstransmittersininter/hyperdatacentersandmetropolitandatalinks.

简介：InGaAs/InPavalanchephotodiodestypicallyworkinthegatedGeigermodetoachievenear-infraredsinglephotondetection.Byusingultrashortgatesandcombiningwiththerobustspike-cancelingtechniquethatconsistsofthecapacitance-balancingandlow-passfilteringtechnique,wedemonstrateanInGaAs/InPsingle-photondetector(SPD)withwidelytunablerepetitionratesinthispaper.Theoperationfrequencycouldbetunedconvenientlyfrom100MHzto1.25GHzwiththeSPD’sperformancemeasuredtomaintaingoodperformance,makingitquitesuitableforquantumkeydistribution,laserranging,andopticaltimedomainreflectometry.Furthermore,theSPDexhibitedextremelylow-noisecharacteristics.ThedetectionefficiencyofthisSPDcouldreach20%withthedarkcountrateof2.5×10-6∕gateandafter-pulseprobabilityof4.1%at1GHz.

简介：把方法(IBM)和有限体积基于沉浸的边界优化因素pre的协议(FVOPC)计划，噪音繁殖在内并且在一把错流扇子的套外面的数字模拟被建立。不稳定的线性化的Euler方程被解决直接模仿飞行器声学的地。为了验证FVOPC，策划，一个模拟盒子：一个维的线性波浪繁殖问题用FVOPC计划，DRP计划和hoc计划被执行。FVOPC的结果在对分析答案的好同意，它比DRP和hoc计划的结果好。FVOPC比DRP和hoc计划是更少的分散和驱散。然后，噪音繁殖问题的数字模拟被执行。36紧缩的旋转噪音来源的噪音地与1000r/min的旋转速度被获得。吸收边界状况的PML为压抑数字思考被用于健全的远地边界条件。墙边界状况被用于套。结果证明在这块地里套墙和声波干扰上有思考。有IBM的FVOPC对在为压抑分散和驱散的复杂几何学下面的噪音繁殖问题合适，并且也把高顺序作为精确。

简介：non-Gaussian噪音驾驶的一个随机的消散的动态系统被调查。系统的一个一般近似佛克普朗克常数方程通过一条路径积分途径被导出。基于香农的信息熵，熵流动的准确时间依赖和系统的熵生产的定义在缺席并且面对非平衡被计算限制。现在的计算能被用来在熵流动和熵生产上解释消散的常数和non-Gaussian噪音的相互影响。

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简介：Theemissionwavelengthofalaserisphysicallypredeterminedbythegainmediumused.Consequently,arbitrarywavelengthgenerationisafundamentalchallengeinthescienceoflight.Presentsolutionsincludeopticalparametricgeneration,requiringcomplexopticalsetupsandspectrallyslicedsupercontinuum,takingadvantageofasimplerfibertechnology:afixed-wavelengthpumplaserpulseisconvertedintoaspectrallyverybroadbandoutput,fromwhichtherequiredresultingwavelengthisthenopticallyfiltered.Unfortunately,thisprocessisassociatedwithaninherentlypoornoisefigure,whichoftenprecludesmanyrealisticapplicationsofsuchsupercontinuumsources.Here,weshowthatbyaddingonlyonepassiveopticalelement—ataperedphotoniccrystalfiber—toafixed-wavelengthfemtosecondlaser,onecaninaverysimplemannerresonantlyconvertthelaseremissionwavelengthintoanultra-wideandcontinuousrangeofdesiredwavelengths,withverylowinherentnoise,andwithoutmechanicalrealignmentofthelaser.Thisisachievedbyexploitingthedoubleinterplayofnonlinearityandchirpinthelasersourceandchirpandphasematchinginthetaperedfiber.Asafirstdemonstrationofthissimpleandinexpensivetechnology,wepresentafemtosecondfiberlasercontinuouslytunableacrosstheentirered–green–bluespectralrange.

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简介：Amode-lockedthulium-dopedfiberlaser(TDFL)basedonnonlinearpolarizationrotation(NPR)withdifferentnetanomalousdispersionisdemonstrated.Whenthecavitydispersionis-1.425ps~2,thenoise-like(NL)pulsewithcoherencespikewidthof406fsandpulseenergyof12.342nJisgeneratedatacenterwavelengthof2003.2nmwith3dBspectralbandwidthof23.20nm.Intheexperimentalperiodof400min,the3dBspectralbandwidthvariation,theoutputpowerfluctuation,andthecentralwavelengthshiftarelessthan0.06nm,0.04dB,and0.4nm,respectively,indicatingthattheNPR-basedTDFLoperatingintheNLregimeholdsgoodlong-termstability.

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