Modulator-kii ugu dambeeyay ee ultra-sare ee baabi'inta koronto-optic

Kii ugu dambeeyayModulator-ka-bakhtiga aadka u sarreeya

On-chip electro-optical modulators (silicon-based, triquinoid, filim khafiif ah lithium niobate, iwm.) waxay leeyihiin faa'iidooyinka is haysta, xawaaraha sare iyo isticmaalka tamarta hooseeya, laakiin weli waxaa jira caqabado waaweyn si loo gaaro isbeddel xoog leh oo firfircoon oo leh saamiga baabi'inta ultra-sare. Dhawaan, cilmi-baarayaasha xarun cilmi-baaris wadajir ah oo loogu talagalay Dareenka Fiber Optic ee jaamacadda Shiinaha ayaa sameeyay horumar weyn oo ku saabsan qaybta dabar-goynta ultra-sare ee modulators-ka elektiroonigga ah ee substrates silicon. Iyada oo ku saleysan nidaamka filter indhaha ee nidaamka sare, silikoon-ka-chipmodulator elektaroonik ahoo leh saamiga baabi'inta ilaa 68 dB ayaa la ogaaday markii ugu horeysay. Baaxadda iyo isticmaalka korontadu waa laba amar oo ka yar kan dhaqankaModulator AOM, iyo suurtagalnimada codsiga aaladda waxaa lagu xaqiijiyay nidaamka DAS ee shaybaarka.

Jaantuska 1 Jaantuska jaantuska ee qalabka tijaabada ee ultraModulator-ka-optic-ga saamiga sare ee baabi'inta sare

Silicon ku salaysanmodulator-ka-elektarooniga ahiyadoo lagu saleynayo qaab dhismeedka shaandhada microring ee isku xiran waxay la mid tahay shaandhada korantada ee qadiimiga ah. Modulator-ka elektiroonigga ah waxa uu ku guulaysta shaandhaynta bandpass fidsan iyo saamiga diidmada sare ee ka baxsan band (> 60 dB) iyada oo loo marayo isku dhafka taxanaha ah ee afar resonators silikoon ku salaysan. Iyada oo la kaashanayo nooca-pin-nooca wareegga korantada-elektarooniga ee mikroring kasta, xajmiga gudbinta ee modulator-ka ayaa si weyn loogu beddeli karaa koronto yar oo codsata (<1.5 V). Saamiga diidmada sare ee ka baxsan band oo ay weheliso sifada shaandhada fiiqan ee hoos u socota ayaa awood u siinaysa xoojinta iftiinka iftiinka ee u dhow hirarka hirarka resonant in lagu beddelo isbarbardhig aad u weyn, kaas oo aad ugu habboon soo saarista aadka u sarreeya ee dareenka dabargoynta.

Si loo xaqiijiyo awoodda wax-ka-beddelka ee modulator-ka-electro-optic-ga, kooxdu waxay marka hore soo bandhigeen kala duwanaanshaha gudbinta aaladda oo leh danab DC ah ee dhererka hirarka. Waxaa la arki karaa in 1 V ka dib, gudbinta ay si aad ah hoos ugu dhacday 60 dB. Sababtoo ah xaddidaadda hababka indho-indheynta oscilloscope-ka caadiga ah, kooxda cilmi-baaristu waxay qaataan habka cabbiraadda is-heterodyne, waxayna adeegsadaan baaxadda firfircoon ee baaxadda spectrometerka si ay u muujiyaan saamiga baabi'inta firfircoon ee ultra-sare ee modulator-ka inta lagu jiro isbeddelka garaaca wadnaha. Natiijooyinka tijaabada ahi waxay muujinayaan in wax soo saarka garaaca iftiinka modulator-ku uu leeyahay saamiga baabi'inta ilaa 68 dB, iyo saamiga baabi'inta in ka badan 65 dB oo u dhow dhowr boos oo hirarka dhererka resonant. Xisaabinta faahfaahsan ka dib, korantada dhabta ah ee RF-da ee ku raran korantada waxay ku dhowdahay 1 V, isticmaalka awoodda wax-ka-beddelku waa 3.6mW oo keliya, taas oo ah laba amar oo ka yar isticmaalka awoodda AOM modulator-ka caadiga ah.

Codsiga modulator-ka ku salaysan Silicon ee nidaamka DAS waxa lagu dabaqi karaa habka ogaanshaha tooska ah ee DAS iyada oo la xidhxidhay modulator-ka-chip-ka. Si ka duwan interferometry-ga guud ee deegaanka-signal heterodyne, qaabka demodulation ee Michelson interferometry aan dheeli tirnayn ayaa lagu qaatay nidaamkan, sidaa darteed saameynta isbeddelka soo noqnoqda indhaha ee modulator-ka looma baahna. Isbeddelka wejiga ee ay sababaan calaamadaha gariirka sinusoidal waxaa si guul leh dib loogu soo celiyay hoos u dhigista calaamadaha kala firdhisan ee Rayleigh ee kanaalada 3 iyadoo la adeegsanayo algorithm demodulation IQ ee caadiga ah. Natiijooyinku waxay muujinayaan in SNR uu ku saabsan yahay 56 dB. Qaybinta cufnaanta korantada ee dhererka dhammaan dhererka fiilada dareemayaasha ee inta jeer ee calaamadaha ± 100 Hz ayaa la sii baaraa. Marka laga reebo calaamadda caanka ah ee goobta gariirka iyo inta jeer ee, waxaa la arkay inay jiraan jawaabaha cufnaanta korantada qaarkood ee meelaha kale ee bannaan. Dhawaaqa isdhaafsiga ee inta u dhaxaysa ± 10 Hz iyo meel ka baxsan booska gariirka ayaa lagu celcelisaa dhererka fiber-ka, celceliska SNR ee meel bannaani kama yarayn 33 dB.

Jaantuska 2

jaantus jaantus ah nidaamka dareenka dhawaaqa qaybsan ee fiber indhaha.

b cufnaanta isha isha ee hoos loo dhigay.

c, d inta jeer ee gariirka u dhow qaybinta cufnaanta korantada oo ay weheliso fiilada dareenka.

Daraasadani waa tii ugu horreysay ee lagu gaaro modulator-ka elektiroonigga ah ee silikoon oo leh saamiga baabi'inta ultra-sare (68dB), oo si guul leh loogu dabaqay nidaamyada DAS, iyo saameynta adeegsiga modulator-ka AOM ganacsigu aad ayuu u dhow yahay, cabbirka iyo isticmaalka korantaduna waa laba amar oo cabbir ka yar kan dambe, kaas oo la filayo inuu door muhiim ah ka ciyaaro jiilka soo socda ee nidaamyada hooseeya ee la qaybiyo. Intaa waxaa dheer, habka wax soo saarka baaxadda weyn ee CMOS iyo awoodda isdhexgalka on-chip ee silikon ku salaysanaaladaha optoelectronicWaxay si weyn kor ugu qaadi kartaa horumarinta jiil cusub oo qiimo jaban ah, qalabyo badan oo isku dhafan oo monolithic ah oo ku salaysan-chip hababka dareenka fiber qaybsan.