搜索
1TN365101832002512035ResearchofNoiseMeasurementSystemofSemiconductorLaser200392005623CNKI4TN36520025120352002920056ResearchofNoiseMeasurementSystemofSemiconductorLaser(3-8),2005415200568/5PCPCLabVIEW6.0ADVANTESTR9211B/CFFT6132.132.232.2.132.2.252.382.3.182.3.282.3.3142.415163.1163.2173.3193.4203.5PC213.622234.1234.2234.2.1234.2.2244.2.32474.3274.4284.5294.6324.6.1324.6.2324.6.3324.734355.1LabVIEW365.1.1LabVIEW365.1.2LabVIEW375.2375.2.1375.2.2395.2.3395.2.4405.2.5415.2.6425.3465.3.1465.3.2475.4475.4.1485.4.24985.4.3495.4.4FFT505.5FFT515.6535.755565760IIV120701962GEIBMMITGaAsGaAs1963KroemerGaAsAlGaAs1970BellHayashiPanishiIoffeAlferovCWAlGaAs/GaAs(DH)0.75-0.9mAlGaAs/GaAsMBEMOCVDMBEMOCVD2197070801985()1/fgr1/fgr32.1()()pn2.22.2.12)(PSRINpω=(2-1)Sp()P()2-14GHzGHzrpmpPS∝(2-2)m=2/332PSp∝(2-3)4PSp∝(2-4)10−∝PSp(2-5)10710610-1010-1110-1310-121091010106108101110-1410-9Hz1/2Hz2.152.2.2(1MHz)(2.2)(mm)dBV2.2604050-62dBV2.3(a)2-3(b)(a)(b)2.3(a)(b)[][]{})(exp)0()(021ttiItEφω+=(2-6)I00[]∆−=+=)(21exp)exp()()()(20*titEtEReφστωτττ(2-7)∫∞−=∆022)cos1()(2))(((ωωτωωπφσφτdSt(2-8)(2-8)22.47(nsec)(GHz)2.422.5SE222(2-8)(2-7)Re()2.52)exp()exp()(210TjRνπτωτ∆−=(2-9)T21ν∆(2-7)(2-8)(2-9)∫∞−=∆02221)cos1()(1ωωτωωπνφdST(2-10)S82.32.3.1,2.3.21.,,(Thermalnoise)19271928RTfREt(2.6(a))g=1/R(2.6(b))9fkTREt∆=42(2-11)fkTgIt∆=42(2-12)kkTRfSv4)(=(2-13)kTgfSI4)(=(2-14)0.1nV/Hz1/22.(Shotnoise)REt(a)gIt(b)2.610qIfSI2)(=(2-15)IqpnV-I[]1)/exp(0−=kTqvII(2-16)I0V(1)pnI0exp(qV/kT)(2)np(-I0)[])2(2)2(21)/exp(2)(00000IIIIkTgIIqkTqVeqIfSI++=+=+=(2-17)g0kTIIqdVdIg)(00+==(2-18)I=00044)(kTgqIfSI==(2-19)II0022)(kTgqIfSI==(2-20)I=-I002)(qIfSI=(2-21)(2-19)(2-20)(2-21)113.g-r-(generation-recombinationnoise)grJFETkTkTkTg-rg-r-g-rg-rg-rg-rg-r)1(11(4)(2),=∆+−=∆NNfffStitititirNγττω(2-22)ftitiNN=1g-r)1(11(4)(2)1,∆+−=∑=∆NNfffStitititiNirNγττω(2-23)12∑=−+=NiiiirgfffCfS1200)(11)((2-24)f0ig-rCi4.1/f1/f1/f6105Hz1/frvfAIfS/)(β=(2-25)IfAr0.8-1.21.0=2.01.0-2.01/f1/f1/f1/f1/f:19571/f1/f-1/f1/f131/f()1/f1/f1/f1/f1/f(1)1/f(2)1/f1/f1/f22/12222/1/132)(LSfEnLsLfvIRNfSqSqfqIRqImkTSfvcατα+∆+++=−(2-26)mkqnTRsNILfSvc-1/fS21/f()1/f(2-26)1/f()1/f1/f141/f2.3.3p-ng-rg-r1/f1/f1/f980nmInGaAsP/InGaAs/GaAlAs1/fpn1/f15,,,,,,,,,.808nm,,pn,pn,pn,,pn,,2.41/fg-r1/fg-rpn1/fg-r163.1LD3.2K12LD()nv/Hznv/HzLD1nv/Hz(1kHz)3.1LD3.217ND-8012nv/HzEG&GModel51840.8nv/Hz3.23.3n1(t)n2(t)()()()[]duutnutsthtx−+−=∫∞1011)((3-1)()()()[]duutnutsthtx−+−=∫∞2022)((3-2)h1(t),h2(t)x1(t)x2(t)()()[]τ−=txtxERxx2121(3-3)Wiener-Khinchine3.318∫∞∞−−=ττωωτdeRSjxxxx)()(2121(3-4)nA(t)nB(t)s(t)()()()()ωωωωsxxSjKjKS*2121=(3-5)K1(j)K2(j)()ωsS(3-5)Max4123.4A3.4BHP35670ACF-9203.4193.3LD3.5LDShiyuanYang25625620s/ch10kHz3.13.1100s200s500s1ms2ms10ms10kHz5kHz2kHz1kHz500Hz100Hz4ch9ch24ch49ch99ch256ch3..5203.41.3.6SiS4/)()cos1()(2212RiSSiωωτωωφ=−(3-6)i1R(3-6)SiS3.6212.3.73.7IdiffIdiffSdiffSSdiffS3.5PC22(FFT)3.8A/DFFTA/D,A/D,,,,FFTA/DA/DA/D3.6()PCPCA/D3.8PC234.14.1LD()pnA/D4.1LD4.24.2.1(CAT)ABA/D24I/O4.2.21.2.(GUI)3.CANFieldBusPROFIBUS4.5.254.2.3()1.(1)(2)/I/OPC/(DAQ)GPIBVXI54.24.2PC-DAQPCIISAPC-DAQGPIBVXIPXI26/(DAQ)GPIPGPIBVXIVXIPXIPXISerialVIUSB()2.VISA(1)VISAVISAI/OI/OVISAVISA(2)(3)27FFTFHTFFTFHTVisualC++VisualBASICLabWindows/CVILabVIEWHPVEELabVIEWVisualC++4.31.2.3.DMA(DirectMemoryAccess)4.5.28USB2007USB2007USBUSBUSB200714BitA/D4A/D5VUSB2007161.45V100M2V2S2.A/DA/D14Bit(16384)1LSB()3s()0.05%4.4EG&GModel51845M//50Pf4500.5Hzto1MHz60dB(1000)C.M.R.R:80dB(100Hzto1kHz)1800pV/Hzat1kHz10mV300mV294.51.4.34.3G=1000AnalogDeviceAD625251215RF215RGRFRGAD625110,000()1G//4pF()1G//4pF5nV/Hz1/2(at1kHz)1.60.62VVs15V2.4.4,AUURRRUUpFµ0011=+==−+(4-1)RRRRRAFFp1111+=+=µ304.4RCR•UM0)_(__0=••+••+••+jwcRRUUUUUUMMMi(4-2)0_=•−••++UUUjwcRM(4-3)(41)(42)(43)fffAjwRcAAUUAfQjjwRcpppi0220101)3(1)()(•+−=+−+=••=•µµµµ(4-4)RRAFp11+=µRcfπ210=31ApQµ−=31(4-5)(4-4)f0RRAAFp11+==•µµQQf=f0•AµQ1/Q(4-4)Q1ff0AApµµ=•ff0(4-5)Ap3QApRF2R1R115kC=1uF,R1=Rf=1k3(1510100)4.5324.54.64.6.1LDLDLDLDmA50HZLD(1A7)LD4.6.2()4.610A—600mA4.64.7334.74.6.350Hz50Hz4.8()eRCen=eRc/(Rc+Rg)4.7RE4.84.9344.9(4.10)4.7()4.10355.15.1LabVIEW6.0VisualC++6.0365.1LabVIEW5.1.1LabVIEWLabVIEW1986(NI)NILabVIEWLabVIEWLabVIEWCBASICLabVIEWGLabVIEWGPIBVXIRS232RS485TCP/IPActiveXLabVIEWLabVIEWLabVIEWLabVIEWLabVIEW(1)(2)(3)ActiveX(4)(5)DLLCIN37VIs(6)32(7)MacintoshHP-UXSUNSPARCWindows3.x/98/NTLabVIEW(8)I/O5.1.2LabVIEWLabVIEW//VI(VI)LabVIEWLabVIEW5.25.2.11.(DFT)38(5-1)∑−=−=102)()(NnkFnTjenTxkFXπ(5-1)2.FFT(FFT)FFTJ.W.CooleyJ.W.Tukey1965FFTFFTN2NFFTNlog2N(log22)FFTN221010241FFT10240FFT1FFTFFTFFT(N)(N)FFTN392FFT1024FFT0-N/2(N/2)1(j)ff1024513401fstepfstep=1/(5-2)fstep=fs/N(5-3)fsFFTfs/2FFT0-fs/2Hz5.2.2T=1/fsfs∑∞−∞=−=nnTtts)()(δ(5-4)∑∞−∞=−=nnTttxnTx)()()(δ(5-5)5.2.3(Nyquist)40max2ffs(5-6)fs=fmax=ff(ff=fs/2)5.2()FFT1.fmaxfmax02.()fmaxfffsfmax2.55.2.4FFTFFT0Hzfs/2FFTfs=256kHzN=1024,fs/N=250Hz5.241250HzNFFTFFTfsFFT(fs)5.2.5FFTFFT(DFT)(5.3)5.3(b)FFT(a)(b)5.3(a)(b)5.4FFT42(a)(b)5.4(a)(b)()5.2.6(1)sin(x)cos(x)(2)43t(3)eat1.(Rectangular)Tt≤≤0)(tW1/T(5-7)tT)(tW0(5-8))(ωWTTωωsin2(5-9)2.(Triangle)Tt≤≤0)(tW)1(1TtT−(5-1