Tsa moraoraoultra-high extinction ratio electro-optic modulator
On-chip electro-optical modulators (silicon-based, triquinoid, thin film lithium niobate, joalo-joalo) e na le melemo ea compactness, lebelo le phahameng le tšebeliso e tlaase ea matla, empa ho ntse ho e-na le mathata a maholo a ho finyella ho feto-fetoha ha matla a matla ka tekanyo e phahameng ea ho fela. Haufinyane tjena, bafuputsi Setsing sa lipatlisiso se kopaneng sa Fiber Optic Sensing univesithing ea Chaena ba entse khatelo-pele e kholo lefapheng la li-ultra-high extinction ratio electro-optical modulators holim'a li-silicon substrates. E ipapisitse le sebopeho se phahameng sa filthara ea optical, on-chip siliconmochine oa motlakase oa motlakaseka karolelano ea ho timela ho fihla ho 68 dB e phethahala ka lekhetlo la pele. Boholo le tšebeliso ea matla ke litekanyo tse peli tsa boholo tse nyane ho feta tsa setsoAOM modulator, 'me bokhoni ba ts'ebeliso ea sesebelisoa bo netefalitsoe tsamaisong ea laboratori ea DAS.
Setšoantšo sa 1 Sets'oants'o sa moralo oa sesebelisoa sa liteko bakeng sa ultrakaro-karolelano e phahameng ea ho timela ha electro-optic modulator
E thehiloeng ka siliconmochine oa motlakase oa motlakaseho ipapisitsoe le sebopeho sa filthara ea microring se ts'oana le filthara ea motlakase ea khale. Electro-optic modulator e finyella ho sefa bandpass e bataletseng le tekanyo e phahameng ea ho hana ka ntle ho sehlopha (> 60 dB) ka ho kopanya letoto la li-microring resonator tse 'nè tse thehiloeng ka silicon. Ka thuso ea Pin-type electro-optical phase shifter ho microring e 'ngoe le e' ngoe, sekhahla sa transmittance sa modulator se ka fetoloa haholo ka matla a tlaase a sebelisoang (<1.5 V). Karolelano e phahameng ea ho hana ha sehlopha e kopantsoeng le tšobotsi ea ho theola sefahla se moepa e nolofalletsa matla a lebone le kentsoeng haufi le leqhubu la resonant hore le fetoloe ka phapang e kholo haholo, e thusang haholo tlhahisong ea maqhubu a mabone a holimo-limo a extinction ratio.
Ho netefatsa bokhoni ba ho feto-fetoha ha motlakase oa motlakase oa motlakase, sehlopha se ile sa qala ho bontša phapang ea phetisetso ea sesebelisoa ka motlakase oa DC ho leqhubu la ho sebetsa. Ho ka bonoa hore kamora 1 V, phetisetso e theoha haholo ho feta 60 dB. Ka lebaka la khaello ea mekhoa e tloaelehileng ea ho shebella li-oscilloscope, sehlopha sa lipatlisiso se sebelisa mokhoa oa ho lekanya ho kena-kenana le heterodyne, 'me se sebelisa mefuta e mengata e matla ea spectrometer ho khetholla tekanyo e phahameng ea matla a ho fela ha modulator nakong ea ho feto-fetoha ha molumo. Liphetho tsa liteko li bonts'a hore phallo ea leseli e hlahisoang ke modulator e na le karo-karolelano ea ho timela e fihlang ho 68 dB, le karolelano ea ho timela e fetang 65 dB haufi le maemo a 'maloa a maqhubu a resonant. Kamora ho bala ka botlalo, motlakase oa 'nete oa RF o kentsoeng electrode o ka ba 1 V, mme tšebeliso ea matla ea modulation ke 3.6 mW feela, e leng liodara tse peli tse nyane ho feta ts'ebeliso ea motlakase e tloaelehileng ea AOM.
Tšebeliso ea Silicon e thehiloeng ho electro-optic modulator tsamaisong ea DAS e ka sebelisoa ho mokhoa o tobileng oa ho lemoha oa DAS ka ho paka on-chip modulator. Ho fapana le kakaretso ea heterodyne interferometry ea sebaka sa heterodyne interferometry, mokhoa oa ho fokotsa Michelson interferometry o sa leka-lekaneng o amoheloa tsamaisong ena, e le hore phello ea optical frequency shift ea modulator e sa hlokehe. Liphetoho tsa mohato tse bakoang ke matšoao a sinusoidal vibrate li khutlisetsoa ka katleho ka ho theola Rayleigh matšoao a hasaneng a likanale tsa 3 ho sebelisa algorithm e tloaelehileng ea IQ. Liphetho li bonts'a hore SNR e ka ba 56 dB. Kabo ea matla a spectral density ka bolelele bohle ba sensor fiber mofuteng oa maqhubu a lets'oao ± 100 Hz e ntse e batlisisoa. Ntle le lets'oao le hlahelletseng sebakeng sa ho thothomela le khafetsa, hoa hlokomeloa hore ho na le likarabelo tse itseng tsa sebono sa matla libakeng tse ling. Lerata la crosstalk sebakeng sa ± 10 Hz le ka ntle ho sebaka sa ho thothomela le lekanngoa ho latela bolelele ba fiber, 'me SNR e tloaelehileng sebakeng ha e ka tlase ho 33 dB.
Setšoantšo sa 2
sets'oants'o sa Schematic sa sistimi ea optical fiber e ajoang.
b Matla a lets'oao a fokotsehileng.
c.
Boithuto bona ke ba pele ba ho fihlela modulator ea electro-optical holim'a silicon e nang le "ultra-high extinction ratio" (68 dB), 'me ea sebelisoa ka katleho ho litsamaiso tsa DAS,' me phello ea ho sebelisa mochine oa AOM oa khoebo e haufi haholo, 'me boholo le tšebeliso ea matla ke liodara tse peli tsa boholo tse nyane ho feta tsa morao-rao, tse lebeletsoeng ho bapala karolo ea bohlokoa molokong o latelang oa tsamaiso e fokolang ea fiber miniatur. Ntle le moo, ts'ebetso e kholo ea tlhahiso ea CMOS le bokhoni ba ho kopanya li-on-chip tsa silicon-basedlisebelisoa tsa optoelectronice ka khothaletsa haholo nts'etsopele ea moloko o mocha oa li-module tsa monolithic tse kopantsoeng tse theko e tlaase, tse nang le lisebelisoa tse ngata tse thehiloeng ho-chip distributed fiber sensing systems.
Nako ea poso: Mar-18-2025