Chosinthira chaposachedwa kwambiri cha electro-optic electro-high extinction ratio

Zaposachedwamodulator ya electro-optic yowonjezereka kwambiri

Ma modulators a electro-optical on-chip (opangidwa ndi silicon, triquinoid, thin film lithium niobate, ndi zina zotero) ali ndi ubwino wokhala ndi compactness, high speed komanso otsika mphamvu, koma pakadali zovuta zazikulu kuti tikwaniritse dynamic intensity modulation ndi ultra-high extinction ratio. Posachedwapa, ofufuza ku joint research Center for Fiber Optic Sensing ku yunivesite yaku China apanga chitukuko chachikulu m'munda wa ultra-high extinction ratio electro-optical modulators pa silicon substrates. Kutengera kapangidwe ka high optical filter, on-chip silicon.modulator yamagetsindi chiŵerengero cha kutha kwa mphamvu mpaka 68 dB chimachitika koyamba. Kukula ndi kugwiritsa ntchito mphamvu ndi zazing'ono ziwiri kuposa zachikhalidwe.AOM modulator, ndipo kuthekera kogwiritsa ntchito chipangizochi kumatsimikiziridwa mu dongosolo la DAS la labotale.

Chithunzi 1 Chithunzi cha chida choyesera cha ultramodulator yamagetsi yamagetsi yotsika kwambiri

Chopangidwa ndi siliconmodulator yamagetsi ndi kuwalaKutengera kapangidwe ka fyuluta ya microring yolumikizidwa, imafanana ndi fyuluta yamagetsi yakale. Electro-optic modulator imakwaniritsa kusefa kwa bandpass yosalala komanso chiŵerengero chachikulu cha kukana kwa band (>60 dB) kudzera mu kulumikizidwa kwa ma resonator anayi a microring okhala ndi silicon. Mothandizidwa ndi Pin-type electro-optical phase shifter mu microring iliyonse, transmittance spectrum ya modulator imatha kusinthidwa kwambiri pamagetsi otsika (<1.5 V). Chiŵerengero cha kukana kwa band yokwera pamodzi ndi khalidwe la steep filter roll-down zimathandiza kuti mphamvu ya kuwala kolowera pafupi ndi kutalika kwa mafunde a resonant isinthidwe ndi kusiyana kwakukulu kwambiri, komwe kumathandiza kwambiri kupanga ma ultra-high extinction ratio light pulses.

Pofuna kutsimikizira mphamvu ya modulation ya electro-optic modulator, gululo linayamba lawonetsa kusintha kwa transmittance ya chipangizocho ndi DC voltage pa operating wavelength. Zikuoneka kuti pambuyo pa 1 V, transmittance imatsika kwambiri kuposa 60 dB. Chifukwa cha kuchepa kwa njira zodziwika bwino zowonera oscilloscope, gulu lofufuza limagwiritsa ntchito njira yoyezera kusokoneza kwa self-heterodyne, ndikugwiritsa ntchito dynamic range yayikulu ya spectrometer kuti iwonetse ultra-high dynamic extinction ratio ya modulator panthawi ya pulse modulation. Zotsatira zoyesera zikuwonetsa kuti output light pulse ya modulator ili ndi extinction ratio ya mpaka 68 dB, ndipo extinction ratio ya yoposa 65 dB pafupi ndi malo angapo a resonant wavelength. Pambuyo powerengera mwatsatanetsatane, RF drive voltage yeniyeni yodzazidwa ku electrode ndi pafupifupi 1 V, ndipo modulation power consumption ndi 3.6 mW yokha, yomwe ndi yaying'ono kwambiri kuposa convention ya AOM modulator yachizolowezi.

Kugwiritsa ntchito modulator ya electro-optic yochokera ku Silicon mu DAS system kungagwiritsidwe ntchito pa direct detection DAS system poyika pa on-chip modulator. Mosiyana ndi interferometry ya local-signal heterodyne, demodulation mode ya non-balanced Michelson interferometry imagwiritsidwa ntchito mu system iyi, kotero kuti optical frequency shift effect ya modulator sikofunikira. Kusintha kwa gawo komwe kumachitika chifukwa cha sinusoidal vibration signals kumabwezeretsedwa bwino pochotsa Rayleigh scattered signals za njira zitatu pogwiritsa ntchito algorithm yachikhalidwe ya IQ demodulation. Zotsatira zake zikuwonetsa kuti SNR ndi pafupifupi 56 dB. Kugawa kwa power spectral density m'litali lonse la sensor fiber mu range of signal frequency ±100 Hz kukufufuzidwa kwambiri. Kupatula chizindikiro chodziwika bwino pamalo ogwedezeka ndi ma frequency, zikuwoneka kuti pali mayankho ena a power spectral density m'malo ena a malo. Phokoso la crosstalk lomwe lili pamtunda wa ±10 Hz ndi kunja kwa malo ogwedezeka limawerengedwa pa avareji m'litali la ulusi, ndipo avareji ya SNR m'mlengalenga si yochepera 33 dB.

Chithunzi 2

Chithunzi cha Schematic cha dongosolo la optical fiber distributed acoustic sensing system.

b Kuchuluka kwa mphamvu ya chizindikiro chowonetsedwa.

c, d mafupipafupi a kugwedezeka pafupi ndi kugawa kwa mphamvu ya spectral kachulukidwe pamodzi ndi ulusi wozindikira.

Kafukufukuyu ndi woyamba kupeza modulator ya electro-optical pa silicon yokhala ndi chiŵerengero cha ultra-high extinction ratio (68 dB), ndipo yagwiritsidwa ntchito bwino pamakina a DAS, ndipo zotsatira za kugwiritsa ntchito modulator yamalonda ya AOM zili pafupi kwambiri, ndipo kukula ndi kugwiritsa ntchito mphamvu ndizochepa kwambiri kuposa zomalizazi, zomwe zikuyembekezeka kukhala ndi gawo lofunika kwambiri m'badwo wotsatira wa makina owonera ulusi ocheperako komanso opanda mphamvu zambiri. Kuphatikiza apo, njira yayikulu yopangira CMOS komanso kuthekera kophatikizana ndi ma chip a silicon-basedzipangizo zamagetsi za optoelectronicZingathandize kwambiri pakukula kwa mibadwo yatsopano ya ma module ophatikizana a monolithic otchipa, okhala ndi zida zambiri omwe amatengera makina owunikira ulusi wogawidwa ndi ma chip.