Modulator yemazuva ano ye ultra-high extinction ratio electro-optic modulator

Zvichangoburwamodulator ye electro-optic modulator ine chiyero chekutsakatika kwakanyanya

Ma-electro-optical modulators e-on-chip (akavakirwa pasilicon, triquinoid, thin film lithium niobate, nezvimwewo) ane zvakanakira zvekuomarara, kumhanya kwakanyanya uye kushandiswa kwesimba shoma, asi kuchine matambudziko makuru ekuwana dynamic intensity modulation ine ultra-high extinction ratio. Munguva pfupi yapfuura, vaongorori vepanzvimbo yekutsvagisa yeFiber Optic Sensing payunivhesiti yekuChina vakaita budiriro huru mumunda we-ultra-high extinction ratio electro-optical modulators pasilicon substrates. Zvichienderana nechimiro che high order optical filter, iyo on-chip siliconmodulator yemagetsi-opticnechiyero chekutsakatika kwesimba chinosvika 68 dB chinoonekwa kekutanga. Saizi uye kushandiswa kwesimba zvidiki zviviri pane zvechinyakare.modulator yeAOM, uye kushanda kwemuchina uyu kunosimbiswa murabhoritari yeDAS system.

Mufananidzo 1. Dhayagiramu yemuenzaniso yechishandiso chekuyedza che Ultramodulator yemagetsi-optic ine chiyero chekutsakatika kwakanyanya

Yakavakirwa pasiliconmodulator yemagetsi-opticalZvichibva pachimiro chefirita re microring rakabatana zvakafanana nefirita remagetsi rekare. Electro-optic modulator inowana kupfapfaidza kwe bandpass yakatsetseka uye chiyero chekuramba chakakwira (>60 dB) kuburikidza nekubatana kwakabatana kwema resonator mana e silicon-based microring. Nerubatsiro rwePin-type electro-optical phase shifter mu microring yega yega, transmittance spectrum ye modulator inogona kuchinjwa zvakanyanya pamagetsi akaderera (<1.5 V). Chiyero chekuramba chakakwira che band pamwe chete ne steep filter roll-down characteristic zvinoita kuti simba rechiedza chekupinda pedyo ne resonant wavelength rigadziriswe ne contrast yakakura kwazvo, iyo inobatsira zvikuru pakugadzirwa kwe ultra-high extinction ratio light pulses.

Kuti vaone kugona kwemodulation kwe electro-optic modulator, timu yakatanga yaratidza kusiyana kwe transmittance yemudziyo ne DC voltage pa operating wavelength. Zvinogona kuonekwa kuti mushure me 1 V, transmittance inodonha zvakanyanya pamusoro pe 60 dB. Nekuda kwekuganhurirwa kwe conventional observation methods, timu yekutsvagisa inoshandisa self-heterodyne interference measurement measurement, uye inoshandisa large dynamic range ye spectrometer kuratidza ultra-high dynamic extinction ratio ye modulator panguva ye pulse modulation. Mhedzisiro yekuyedza inoratidza kuti output light pulse ye modulator ine extinction ratio inosvika 68 dB, uye extinction ratio inopfuura 65 dB iri pedyo nenzvimbo dzakasiyana dze resonant wavelength. Mushure mekuverenga zvakadzama, RF drive voltage chaiyo yakatakura ku electrode inenge 1 V, uye modulation power consumption inongova 3.6 mW, inova miviri orders yehukuru hudiki pane conventional AOM modulator power consumption.

Kushandiswa kweSilicon based electro-optic modulator muDAS system kunogona kushandiswa kune direct detection DAS system nekurongedza on-chip modulator. Kusiyana ne general local-signal heterodyne interferometry, demodulation mode ye non-balanced Michelson interferometry inoshandiswa musystem iyi, kuitira kuti optical frequency shift effect yemodulator isadiwe. Kuchinja kwechikamu kunokonzerwa ne sinusoidal vibration signals kunodzoserwa zvinobudirira ne demodulation ye Rayleigh scattered signals dze 3 channels uchishandisa conventional IQ demodulation algorithm. Mhedzisiro yacho inoratidza kuti SNR inenge 56 dB. Kugoverwa kwe power spectral density pamwe chete nehurefu hwese hwe sensor fiber mu range ye signal frequency ±100 Hz kunoongororwa zvakare. Kunze kwe prominent signal panzvimbo ye vibration uye frequency, zvinoonekwa kuti kune mamwe ma power spectral density responses kune dzimwe nzvimbo. Crosstalk noise iri pakati pe ±10 Hz uye kunze kwe vibration position inoverengerwa pamwe chete nehurefu hwe fiber, uye avhareji ye SNR muchadenga haisi pasi pe 33 dB.

Mufananidzo 2

Dhiyagiramu yeSchematic ye optical fiber distributed acoustic sensitization system.

b Kuwanda kwesimba rechiratidzo kwakaderedzwa.

c, d mafrequency ekudzungudza ari pedyo nekugoverwa kwesimba respectral density pamwe chete nefiber yekunzwa.

Chidzidzo ichi ndicho chekutanga kuwana modulator ye electro-optical pa silicon ine chiyero chekupera kwakanyanya (68 dB), uye yakashandiswa zvinobudirira kuma DAS systems, uye mhedzisiro yekushandisa commercial AOM modulator iri pedyo zvikuru, uye saizi nekushandiswa kwesimba zvakaderera pane zvekupedzisira, izvo zvinotarisirwa kutamba basa guru muchizvarwa chinotevera che miniaturized, low-power distributed fiber sensing systems. Pamusoro pezvo, maitiro makuru ekugadzira CMOS uye kugona kwekubatanidza on-chip kwe silicon-based ratiozvishandiso zvemagetsi zve optoelectronicinogona kukurudzira zvikuru kukura kwechizvarwa chitsva chemamodule akabatanidzwa emidziyo yakawanda, asingadhuri, akavakirwa pamasisitimu ekuona fiber akaparadzirwa nemachip.