Qhov tseeb ultra-high extinction ratio electro-optic modulator

Qhov tseebultra-high extinction ratio electro-optic modulator

On-chip electro-optical modulators (silicon-raws li, triquinoid, nyias zaj duab xis lithium niobate, thiab lwm yam) muaj qhov zoo ntawm compactness, siab ceev thiab tsawg zog noj, tab sis tseem muaj cov kev cov nyom loj heev kom ua tau zoo dynamic siv modulation nrog ultra-high extinction ratio. Tsis ntev los no, cov kws tshawb fawb ntawm qhov chaw tshawb fawb sib koom ua ke rau Fiber Optic Sensing ntawm ib lub tsev kawm ntawv hauv Suav teb tau ua qhov kev sib tw loj hauv thaj tsam ntawm ultra-high extinction ratio electro-optical modulators ntawm silicon substrates. Raws li qhov kev txiav txim siab kho qhov muag lim cov qauv, lub on-chip siliconelectro-optic modulatornrog extinction piv txog li 68 dB yog pom tau thawj zaug. Qhov loj thiab lub zog noj yog ob qhov kev txiav txim ntawm qhov loj me dua li cov tsoosAOM modulator, thiab daim ntawv thov ua tau ntawm cov cuab yeej raug txheeb xyuas hauv chav kuaj DAS.

Daim duab 1 Schematic daim duab ntawm kev xeem ntaus ntawv rau ultrasiab extinction ratio electro-optic modulator

Cov khoom siv siliconelectro-optical modulatorraws li kev sib txuas microring lim qauv zoo ib yam li cov lim hluav taws xob classical. Electro-optic modulator ua tiav cov kev lim dej tiaj tus thiab qhov siab tawm ntawm qhov tsis lees txais qhov piv (> 60 dB) los ntawm kev sib txuas ntawm plaub lub silicon-based microring resonators. Nrog kev pab los ntawm Pin-type electro-optical theem shifter nyob rau hauv txhua lub microring, transmittance spectrum ntawm lub modulator tuaj yeem hloov pauv tau ntawm qhov siv hluav taws xob tsawg (<1.5 V). Qhov siab tawm ntawm qhov kev tsis lees paub qhov sib piv ua ke nrog cov kab nrib pleb dov-down tus yam ntxwv ua rau qhov kev siv ntawm lub teeb pom kev nyob ze ntawm lub resonant wavelength los hloov kho nrog qhov sib txawv loj heev, uas yog qhov zoo heev rau kev tsim cov ultra-high extinction ratio lub teeb pulses.

Txhawm rau txheeb xyuas qhov muaj peev xwm ntawm kev hloov pauv ntawm lub tshuab hluav taws xob-optic, pab pawg thawj zaug tau qhia qhov txawv ntawm qhov kev xa tawm ntawm lub cuab yeej nrog DC voltage ntawm kev ua haujlwm wavelength. Nws tuaj yeem pom tias tom qab 1 V, qhov kev xa tawm poob qis dua 60 dB. Vim qhov kev txwv ntawm cov qauv kev soj ntsuam oscilloscope, pab pawg tshawb fawb tau txais kev ntsuas tus kheej-heterodyne cuam tshuam, thiab siv qhov loj dynamic ntau ntawm spectrometer los ua tus yam ntxwv ntawm ultra-high dynamic extinction ratio ntawm lub modulator thaum lub sij hawm mem tes modulation. Cov txiaj ntsig kev sim qhia tau hais tias qhov tso zis lub teeb mem tes ntawm lub modulator muaj qhov sib piv ntawm kev ploj mus txog 68 dB, thiab qhov kev ploj tuag ntawm ntau dua 65 dB ze rau ntau txoj haujlwm resonant wavelength. Tom qab cov lus qhia ntxaws ntxaws, qhov tseeb RF tsav voltage loaded rau lub electrode yog hais txog 1 V, thiab lub zog siv hluav taws xob tsuas yog 3.6 mW, uas yog ob qhov kev txiav txim ntawm qhov loj me dua li cov qauv AOM modulator fais fab noj.

Daim ntawv thov ntawm Silicon raws li electro-optic modulator nyob rau hauv DAS system yuav siv tau rau ib tug ncaj qha nrhiav tau DAS system los ntawm ntim cov on-chip modulator. Qhov sib txawv ntawm qhov dav dav hauv zos-cim heterodyne interferometry, demodulation hom tsis sib npaug Michelson interferometry tau txais yuav hauv qhov system no, kom tsis txhob muaj qhov cuam tshuam ntawm qhov hloov pauv ntawm qhov hloov pauv. Cov theem hloov pauv tshwm sim los ntawm sinusoidal vibration signals tau ua tiav rov qab los ntawm demodulation ntawm Rayleigh tawg cov cim ntawm 3 raws siv cov qauv IQ demodulation algorithm. Cov txiaj ntsig tau pom tias SNR yog li 56 dB. Kev faib tawm ntawm lub zog spectral ntom ntom ntawm tag nrho qhov ntev ntawm lub sensor fiber ntau hauv qhov ntau ntawm cov teeb liab zaus ± 100 Hz yog tshawb xyuas ntxiv. Dhau li ntawm cov teeb liab tseem ceeb ntawm txoj hauj lwm vibration thiab zaus, nws tau pom tias muaj qee lub zog spectral density teb ntawm lwm qhov chaw. Lub suab nrov crosstalk nyob rau hauv thaj tsam ntawm ± 10 Hz thiab sab nraum lub vibration txoj hauj lwm yog nruab nrab raws li qhov ntev ntawm cov fiber, thiab qhov nruab nrab SNR nyob rau hauv qhov chaw tsis tsawg tshaj li 33 dB.

Daim duab 2

Schematic daim duab ntawm optical fiber faib acoustic sensing system.

b Demodulated teeb liab hwj chim spectral ceev.

c, d vibration frequencies nyob ze ntawm lub hwj chim spectral density tis raws lub sensing fiber.

Txoj kev tshawb no yog thawj zaug ua tiav cov khoom siv hluav taws xob kho qhov muag ntawm silicon nrog qhov sib piv ntawm ultra-high extinction ratio (68 dB), thiab ua tiav siv rau DAS systems, thiab cov txiaj ntsig ntawm kev siv kev lag luam AOM modulator yog ze heev, thiab qhov loj thiab lub zog noj yog ob qhov kev txiav txim ntawm qhov loj me dua li yav tas los, uas yuav tsum tau ua lub luag haujlwm tseem ceeb hauv lub zog tom ntej ntawm cov tshuab hluav taws xob me me. Tsis tas li ntawd, CMOS cov txheej txheem tsim khoom loj thiab kev sib koom ua ke ntawm cov chips muaj peev xwm ntawm silicon-basedcov khoom siv optoelectronictuaj yeem txhawb txoj kev loj hlob ntawm ib tiam tshiab ntawm tus nqi qis, ntau yam khoom siv monolithic integrated modules raws li cov chip faib fiber ntau sensing systems.