Qhov tseeb tshaj plaws ultra-high extinction ratio electro-optic modulator

Qhov tseeb tshaj plawsultra-high extinction ratio electro-optic modulator

Cov khoom siv hluav taws xob kho qhov muag uas siv rau hauv lub nti (silicon-based, triquinoid, thin film lithium niobate, thiab lwm yam) muaj qhov zoo ntawm kev me me, kev ceev ceev thiab kev siv hluav taws xob tsawg, tab sis tseem muaj kev cov nyom loj heev kom ua tiav kev hloov pauv dynamic intensity nrog ultra-high extinction ratio. Tsis ntev los no, cov kws tshawb fawb ntawm Lub Chaw Tshawb Fawb Sib Koom Tes rau Fiber Optic Sensing ntawm lub tsev kawm ntawv Suav tau ua qhov kev tshawb pom loj hauv kev ua haujlwm ntawm ultra-high extinction ratio electro-optical modulators ntawm silicon substrates. Raws li cov qauv lim dej siab, cov silicon hauv ntielectro-optic modulatornrog rau qhov sib piv ntawm kev ploj mus txog 68 dB tau pom thawj zaug. Qhov loj me thiab kev siv hluav taws xob yog ob qho kev txiav txim ntawm qhov loj me dua li ntawm cov tsoosAOM modulator, thiab qhov ua tau ntawm daim ntawv thov ntawm lub cuab yeej tau txheeb xyuas hauv lub chaw kuaj mob DAS system.

Daim Duab 1 Daim duab qhia txog lub cuab yeej sim rau ultraqhov piv txwv siab ntawm kev ploj mus electro-optic modulator

Cov khoom siv siliconelectro-optical modulatorRaws li cov qauv lim microring txuas zoo ib yam li cov lim hluav taws xob qub. Lub electro-optic modulator ua tiav cov lim bandpass tiaj tus thiab qhov siab tawm ntawm cov qhab tsis lees txais (> 60 dB) los ntawm kev sib txuas ntawm plaub lub silicon-based microring resonators. Nrog kev pab los ntawm Pin-type electro-optical phase shifter hauv txhua lub microring, qhov transmittance spectrum ntawm modulator tuaj yeem hloov pauv ntau ntawm qhov hluav taws xob tsawg (<1.5 V). Qhov siab tawm ntawm cov qhab tsis lees txais ua ke nrog lub steep filter roll-down feature ua rau lub zog ntawm lub teeb nkag ze ntawm qhov resonant wavelength kom raug modulated nrog qhov sib piv loj heev, uas yog qhov zoo heev rau kev tsim cov ultra-high extinction ratio lub teeb pulses.

Yuav kom paub tseeb tias lub electro-optic modulator muaj peev xwm hloov kho tau li cas, pab neeg no tau ua qauv qhia txog qhov sib txawv ntawm qhov xa tawm ntawm lub cuab yeej nrog rau DC voltage ntawm qhov wavelength ua haujlwm. Nws tuaj yeem pom tias tom qab 1 V, qhov xa tawm poob qis dua 60 dB. Vim yog qhov txwv ntawm cov txheej txheem soj ntsuam oscilloscope ib txwm muaj, pab neeg tshawb fawb tau siv txoj kev ntsuas kev cuam tshuam tus kheej-heterodyne, thiab siv cov dynamic range loj ntawm spectrometer los piav qhia txog qhov ultra-high dynamic extinction ratio ntawm modulator thaum lub sijhawm pulse modulation. Cov txiaj ntsig ntawm kev sim qhia tau tias lub teeb pulse tso zis ntawm modulator muaj qhov extinction ratio txog li 68 dB, thiab qhov extinction ratio ntau dua 65 dB ze ntawm ntau qhov chaw resonant wavelength. Tom qab kev xam kom ntxaws, qhov tseeb RF tsav voltage loaded rau lub electrode yog li 1 V, thiab lub zog modulation siv tsuas yog 3.6 mW, uas yog ob qho kev txiav txim ntawm qhov loj me dua li cov qauv AOM modulator siv zog.

Daim ntawv thov ntawm Silicon raws li electro-optic modulator hauv DAS system tuaj yeem siv rau qhov kev tshawb pom ncaj qha DAS system los ntawm kev ntim cov modulator on-chip. Txawv ntawm qhov dav dav hauv zos-teeb liab heterodyne interferometry, hom demodulation ntawm tsis sib npaug Michelson interferometry tau txais yuav hauv lub kaw lus no, yog li ntawd qhov cuam tshuam ntawm qhov hloov pauv zaus ntawm lub modulator tsis tas yuav tsum tau. Cov kev hloov pauv theem tshwm sim los ntawm cov teeb liab sinusoidal vibration tau rov qab los ntawm demodulation ntawm Rayleigh scattered teeb liab ntawm 3 channel siv cov txheej txheem IQ demodulation. Cov txiaj ntsig qhia tau tias SNR yog li 56 dB. Kev faib tawm ntawm lub zog spectral ceev raws li tag nrho qhov ntev ntawm lub sensor fiber hauv qhov ntau ntawm lub teeb liab zaus ± 100 Hz yog tshawb xyuas ntxiv. Dhau li ntawm lub teeb liab tseem ceeb ntawm qhov chaw vibration thiab zaus, nws tau pom tias muaj qee qhov kev teb ceev ntawm lub zog spectral ntawm lwm qhov chaw. Lub suab nrov crosstalk hauv qhov ntau ntawm ± 10 Hz thiab sab nraum qhov chaw vibration yog qhov nruab nrab raws li qhov ntev ntawm lub fiber, thiab qhov nruab nrab SNR hauv qhov chaw tsis tsawg dua 33 dB.

Daim Duab 2

Daim duab qhia txog kev siv optical fiber distributed acoustic sensing system.

b Demodulated teeb liab lub zog spectral ceev.

c, d qhov zaus ntawm kev co ze ntawm lub zog spectral density faib raws li lub sensing fiber.

Txoj kev tshawb fawb no yog thawj zaug uas ua tiav lub tshuab hluav taws xob electro-optical modulator ntawm silicon nrog qhov sib piv ultra-high extinction (68 dB), thiab ua tiav siv rau DAS systems, thiab qhov cuam tshuam ntawm kev siv AOM modulator lag luam yog ze heev, thiab qhov loj me thiab kev siv hluav taws xob yog ob qho kev txiav txim siab me dua li qhov kawg, uas xav tias yuav ua lub luag haujlwm tseem ceeb hauv tiam tom ntej ntawm miniaturized, qis-zog faib fiber sensing systems. Tsis tas li ntawd, CMOS loj-scale manufacturing txheej txheem thiab on-chip kev koom ua ke muaj peev xwm ntawm silicon-raws licov khoom siv hluav taws xob optoelectronictuaj yeem txhawb nqa kev tsim kho ntawm ib tiam tshiab ntawm cov khoom siv pheej yig, ntau yam khoom siv monolithic integrated modules raws li on-chip distributed fiber sensing systems.