Makina aposachedwa kwambiri amtundu wa electro-optic ratio

ZaposachedwaUltra-high extinction ratio electro-optic modulator

Pa-chip electro-optical modulators (silicon-based, triquinoid, film thin lifiyamu niobate, etc.) ali ndi ubwino wa compactness, kuthamanga kwambiri komanso kugwiritsa ntchito mphamvu zochepa, komabe pali zovuta zazikulu kuti mukwaniritse kusinthasintha kwamphamvu kwambiri ndi chiŵerengero cha kutha kwapamwamba kwambiri. Posachedwapa, ofufuza a Center Research for Fiber Optic Sensing pa yunivesite yaku China apanga bwino kwambiri pankhani ya ma electro-optical modulators ophatikizika kwambiri pazitsulo za silicon. Kutengera kapangidwe kapamwamba kasefa kapamwamba, pa-chip siliconelectro-optic modulatorndi chiŵerengero cha kutha kwa 68 dB chimazindikirika kwa nthawi yoyamba. Kukula ndi kugwiritsa ntchito mphamvu ndi njira ziwiri zocheperako kuposa zachikhalidweAOM module, ndi kuthekera kwa kugwiritsa ntchito chipangizochi kumatsimikiziridwa mu labotale DAS system.

Chithunzi 1 Chojambula chojambula cha chipangizo choyesera cha ultraHigh extinction ratio electro-optic modulator

Zopangidwa ndi siliconelectro-optical modulekutengera mawonekedwe a fyuluta ya microring ndi ofanana ndi fyuluta yamagetsi yakale. Electro-optic modulator imakwaniritsa kusefa kwa bandpass komanso chiwongola dzanja chambiri chokana (> 60 dB) kudzera pamndandanda wophatikiza wa ma silicon-based microring resonators anayi. Mothandizidwa ndi Pin-type electro-optical phase shifter mu microring iliyonse, transmittance spectrum ya modulator ikhoza kusinthidwa kwambiri pamagetsi otsika (<1.5 V). Kuchuluka kwa kukana kwa bandesi kuphatikiziridwa ndi mawonekedwe otsetsereka a fyuluta yotsika kumathandizira kuchulukira kwa kuwala kolowera pafupi ndi mawonekedwe a resonant wavelength kuti kusinthidwa ndi kusiyanitsa kwakukulu, komwe kumathandizira kupanga ma ultra-high extinction ratio ratio light pulses.

Kuti atsimikizire kusinthasintha kwa makina opangira ma electro-optic modulator, gululo lidawonetsa koyamba kusinthika kwa kachitidwe ka chipangizocho ndi voteji ya DC pa kutalika kwa mawonekedwe. Zitha kuwoneka kuti pambuyo pa 1 V, kutumizira kumatsika kwambiri kuposa 60 dB. Chifukwa cha kuchepa kwa njira zowonera za oscilloscope, gulu lofufuza limagwiritsa ntchito njira yoyezera kusokoneza kwa heterodyne, ndipo limagwiritsa ntchito mitundu yayikulu yamphamvu ya spectrometer kuti iwonetsere kutha kwamphamvu kwambiri kwa modulator panthawi yosinthira kugunda kwa mtima. Zotsatira zoyeserera zikuwonetsa kuti kutulutsa kwamphamvu kwa modulator kumakhala ndi chiŵerengero cha kutha mpaka 68 dB, ndi chiŵerengero cha kuzimiririka choposa 65 dB pafupi ndi malo angapo a resonant wavelength. Pambuyo pa kuwerengera mwatsatanetsatane, magetsi enieni a RF drive odzaza ma elekitirodi ndi pafupifupi 1 V, ndipo kugwiritsa ntchito mphamvu zosinthira kumangokhala 3.6 mW, omwe ndi madongosolo awiri ang'onoang'ono kuposa momwe amagwiritsira ntchito modulator wamba wa AOM.

Kugwiritsa ntchito kwa Silicon based electro-optic modulator mu DAS system kumatha kugwiritsidwa ntchito panjira yodziwikiratu ya DAS ponyamula pa-chip modulator. Mosiyana ndi ma interferometry am'deralo-signal heterodyne interferometry, njira yowonongeka ya Michelson interferometry yosagwirizana imatengedwa m'dongosolo lino, kotero kuti mawonekedwe afupipafupi osinthika a modulator safunikira. Kusintha kwa gawo komwe kumayambitsidwa ndi ma sinusoidal vibration siginecha kumabwezeretsedwa bwino ndikutsitsa ma Rayleigh amwazikana ma mayendedwe a 3 pogwiritsa ntchito wamba wa IQ demodulation algorithm. Zotsatira zikuwonetsa kuti SNR ili pafupi ndi 56 dB. Kugawidwa kwa kachulukidwe kamphamvu kowoneka bwino muutali wonse wa sensa ya sensa mumitundu yama frequency ± 100 Hz kumafufuzidwanso. Kupatula chizindikiro chodziwika bwino pamalo ogwedezeka komanso pafupipafupi, zimawonedwa kuti pali mayankho ena amphamvu yowoneka bwino m'malo ena. Phokoso la crosstalk mumtundu wa ± 10 Hz ndi kunja kwa malo ogwedezeka ndi pafupifupi kutalika kwa ulusi, ndipo pafupifupi SNR mu danga si osachepera 33 dB.

Chithunzi 2

Chithunzi cha Schematic cha optical CHIKWANGWANI chogawa makina omvera omvera.

b Kuchepetsa mphamvu ya siginecha yowoneka bwino.

c, d ma frequency a vibration pafupi ndi kachulukidwe kamphamvu kowonera mphamvu motsatira ulusi womverera.

Kafukufukuyu ndi woyamba kukwaniritsa electro-optical modulator pa silicon ndi kopitilira muyeso-mkulu kutha chiŵerengero (68 dB), ndi bwino ntchito kwa machitidwe DAS, ndi zotsatira za ntchito malonda AOM modulator ndi pafupi kwambiri, ndi kukula ndi kugwiritsa ntchito mphamvu ndi madongosolo awiri a ukulu ang'onoang'ono kuposa yotsirizira, amene akuyembekezeka kuchita mbali yofunika kwambiri mu m'badwo wotsatira otsika kachitidwe fiber sensia mphamvu kugawa. Kuphatikiza apo, njira yayikulu yopangira CMOS komanso kuthekera kophatikizana kwa chip pa silicon-basedzida za optoelectronicakhoza kulimbikitsa kwambiri chitukuko cha mbadwo watsopano wa otsika mtengo, multi-device monolithic Integrated modules zochokera-chip kugawira CHIKWANGWANI sensing machitidwe.