Zvichangoburwaultra-high extinction ratio electro-optic modulator
On-chip electro-optical modulators (silicon-based, triquinoid, thin film lithium niobate, etc.) vane zvakanakira compactness, high speed uye kuderera kwesimba rekushandisa, asi pachine matambudziko makuru ekuwana dynamic intensity modulation ne-ultra-high extinction ratio. Nguva pfupi yadarika, vaongorori vepamubatanidzwa wekutsvagisa Center yeFiber Optic Sensing payunivhesiti yeChinese vakaita budiriro huru mumunda weiyo yekupedzisira-yepamusoro yekutsakatika ratio electro-optical modulators pasilicon substrates. Kubva pane yakakwira optical sefa chimiro, iyo pa-chip siliconelectro-optic modulatornekutsakatika reshiyo inosvika 68 dB inoonekwa kekutanga. Saizi uye mashandisirwo emagetsi maodha maviri ehukuru madiki pane echinyakareAOM modulator, uye kugona kwekushandisa kwechishandiso kunosimbiswa murabhoritari DAS system.
Mufananidzo 1 Schematic dhayagiramu yebvunzo mudziyo weUltrahigh extinction ratio electro-optic modulator
Iyo silicon-yakavakirwaelectro-optical modulatorzvichibva pane yakasanganiswa microring sefa chimiro chakafanana neyekirasi yemagetsi sefa. Iyo electro-optic modulator inowana flat bandpass kusefa uye yakakwirira kunze-kwe-bhendi rejection rejection (> 60 dB) kuburikidza neyakatevedzana yekubatanidza yechina-silicon-based microring resonators. Nekubatsirwa kwePin-type electro-optical phase shifter mune imwe neimwe microring, iyo transmittance spectrum ye modulator inogona kuchinjwa zvakanyanya pane yakaderera inoshandiswa voltage (<1.5 V). Iyo yakakwira kunze kwebhendi rejeshi yekurambwa yakasanganiswa neinokwira sefa yekudonha-pasi maitiro inogonesa kuwanda kwechiedza chekuisa pedyo neresonant wavelength kuti igadziriswe nemusiyano wakakura kwazvo, unonyatso batsira pakugadzirwa kwe-ultra-high extinction ratio light pulses.
Kuona kugona kwekugona kweiyo electro-optic modulator, timu yakatanga kuratidza kuchinjika kwekufambisa kwemudziyo neDC voltage pawavelength yekushanda. Zvinogona kuoneka kuti mushure me1 V, iyo transmittance inodonha zvakanyanya pamusoro pe60 dB. Nekuda kwekuganhurirwa kwemaitiro akajairwa oscilloscope yekutarisa nzira, boka rekutsvagisa rinotora iyo yega-heterodyne kupindira yekuyera nzira, uye inoshandisa yakakura simba renji reiyo spectrometer kuratidza iyo yekupedzisira-yepamusoro dynamic extinction ratio yemodulator panguva yekupuruzira modulation. Mhedzisiro yekuedza inoratidza kuti kubuda kwechiedza kupuruzira kwe modulator ine chiyero chekutsakatika kusvika ku68 dB, uye chiyero chekutsakatika chinodarika 65 dB padhuze akati wandei eresonant wavelength nzvimbo. Mushure mekuverenga kwakadzama, iyo chaiyo RF drive voltage yakarongedzerwa kune electrode ingangoita 1 V, uye modulation simba rekushandisa rinongori 3.6 mW, ari maodha maviri ehukuru madiki pane akajairwa AOM modulator simba rekushandisa.
Iko kushandiswa kweSilicon yakavakirwa electro-optic modulator muDAS system inogona kuiswa kune yakananga yekuona DAS system nekurongedza pa-chip modulator. Yakasiyana nehuwandu hwemunharaunda-chiratidzo heterodyne interferometry, demodulation mode ye-non-balanced Michelson interferometry inogamuchirwa muhurongwa huno, kuitira kuti optical frequency shift effect ye modulator isingadiwi. Kuchinja kwechikamu kunokonzerwa ne sinusoidal vibration zviratidzo zvinobudirira kudzoreredzwa nedemodulation yeRayleigh yakapararira masaini e3 chiteshi uchishandisa yakajairwa IQ demodulation algorithm. Mhedzisiro yacho inoratidza kuti iyo SNR ingangoita 56 dB. Kugoverwa kwesimba spectral density pamwe nehurefu hwese hwe sensor fiber muhuwandu hwechiratidzo frequency ± 100 Hz inoongororwa zvakare. Kunze kwechiratidzo chakatanhamara panzvimbo yevibration uye frequency, zvinoonekwa kuti kune mamwe masimba ekutarisa density mhinduro kune dzimwe nzvimbo dzepasi. Ruzha rwe crosstalk muhupamhi hwe ± 10 Hz uye kunze kwenzvimbo yekuzunguza inoyerwa pamwe nehurefu hwefiber, uye avhareji SNR munzvimbo haisi pasi pe33 dB.
Mufananidzo 2
dhiyabhorosi yeSchematic ye optical fiber yakagoverwa acoustic sensing system.
b Demodulated chiratidzo simba spectral density.
c, d mafambisirwo ekudengenyeka padyo nemagetsi espectral density kugovera pamwe chete nefiber inonzwa.
Chidzidzo ichi ndicho chekutanga kuwana electro-optical modulator pasilicon ine ultra-high extinction ratio (68 dB), uye yakashandiswa zvakabudirira kuDAS masisitimu, uye mhedzisiro yekushandisa yekutengesa AOM modulator iri padyo, uye saizi uye mashandisirwo emagetsi maodha maviri ehukuru madiki pane ekupedzisira, ayo anotarisirwa kuita basa rakakosha muchizvarwa chinotevera, yakaderera kugovera fiber. Uye zvakare, iyo CMOS yakakura-chiyero chekugadzira maitiro uye pane-chip yekubatanidza kugona kwesilicon-yakavakirwaoptoelectronic zvishandisoinogona kukurudzira zvikuru kuvandudzwa kwechizvarwa chitsva chemutengo wakaderera, multi-device monolithic integrated modules based on-chip distributed fiber sensing systems.
Nguva yekutumira: Mar-18-2025