1.2 Time & Freguency-domain expression and spectrumSpectraofsometypicalsignalsTAIRBisstariehtaCanlra4Spectrum ofSettiaCWDMsignalSreenseFIEf(Hz)500100015002000250030000SpectrumofHumanVoiceSpectrumoflasersignal193050193060f(GHz)2025/11/27
2025/11/27 ⚫ Spectra of some typical signals Spectrum of CWDM signal Spectrum of laser signal Spectrum of Human Voice 6 0 500 1000 1500 2000 2500 3000 (Hz) A 𝑓(𝐺𝐻𝑧) 𝑃0(𝑚𝑊) 1.2 Time & Frequency-domain expression and spectrum
1.3Signals: analog v.s. digital时间信息码元顿头1PPS5ms5ms8ms8ms2msomsmsSDelayevolutionover24hours8msinaopticalfibersvstemfor?5ms8ms:5ms5msTime/Frequencytransfer--ADDA491.016A-BCodeformatoftheB-A491.014ostandardIRIG-B(DC)491.012(s)e491.010491.008491.006491.004491.002Oob-3DigitalAnalogA/D1224303614inputouiputconvertertime(Hour)obN-1O二2025/11/27
2025/11/27 1.3 Signals: analog v.s. digital 0 6 12 18 24 30 36 491.002 491.004 491.006 491.008 491.010 491.012 491.014 491.016 A-B B-A delay(us) time(Hour) -3 -2 -1 0 1 clock difference (ns) Delay evolution over 24 hours in a optical fiber system for Time/Frequency transfer Code format of the standard IRIG-B(DC) AD DA 7
81.4 AmplifiersElectronic circuits canperform manyanalogand digitalsignalprocessingfunctionsThis course mainly deals with the simplest butmost important functionAmplificationDirectionof signalflowOutputInputOutputInputOOOO(a) Circuit symbol(b) With a common terminal (ground)2025/11/27
2025/11/27 1.4 Amplifiers ⚫ Electronic circuits can perform many analog and digital signal processing functions ⚫ This course mainly deals with the simplest but most important function——Amplification (a) Circuit symbol (b) With a common terminal (ground) Direction of signal flow 8