Okwakamuvai-electro-optic modulator yesilinganiso sokuphela esiphezulu kakhulu
Ama-modulators e-electro-optical asebenza kuma-chip (asekelwe kuma-silicon, ama-triquinoid, ama-thin film lithium niobate, njll.) anezinzuzo zokuba yinkimbinkimbi, isivinini esikhulu kanye nokusetshenziswa kwamandla aphansi, kodwa kusenezinselele ezinkulu zokufeza ukuguqulwa kwamandla okuguquguqukayo ngesilinganiso sokuphela esiphezulu kakhulu. Muva nje, abacwaningi eSikhungweni Sokucwaninga Esihlangene Se-Fiber Optic Sensing eyunivesithi yaseShayina benze intuthuko enkulu emkhakheni wama-modulators e-electro-optical ratio yokuphela okuphezulu kakhulu kuma-substrates e-silicon. Ngokusekelwe esakhiweni sesihlungi se-optical esiphezulu, i-silicon e-on-chipi-electro-optic modulatorngesilinganiso sokuphela esifinyelela ku-68 dB sitholakala okokuqala. Usayizi kanye nokusetshenziswa kwamandla kuncane kakhulu kunokwendabuko.I-modulator ye-AOM, futhi ukusebenza kahle kwedivayisi kuqinisekiswa ohlelweni lwe-DAS lwelebhu.
Umfanekiso 1 Umdwebo weskimu wedivayisi yokuhlola ye-ultrai-electro-optic modulator yesilinganiso sokuphela okuphezulu
Isekelwe ku-siliconi-modulator ye-electro-opticalNgokusekelwe esakhiweni sesihlungi se-microring esihlanganisiwe kufana nesihlungi sikagesi sakudala. I-electro-optic modulator ifinyelela ukuhlunga kwe-flat bandpass kanye nesilinganiso sokwenqatshwa okuphezulu kwe-out-of-band (>60 dB) ngokuhlanganiswa ochungechungeni kwama-resonator amane e-microring asekelwe ku-silicon. Ngosizo lwe-Pin-type electro-optical phase shifter ku-microring ngayinye, i-transmittance spectrum ye-modulator ingashintshwa kakhulu ku-voltage ephansi esetshenzisiwe (<1.5 V). Isilinganiso sokwenqatshwa okuphezulu kwe-out of band esihlanganiswe nesici se-steep filter roll-down senza amandla okukhanya okufakwayo eduze kwe-wavelength ye-resonant aguqulwe ngokuphambene okukhulu kakhulu, okuhambisana kakhulu nokukhiqizwa kwama-pulse okukhanya kwe-extinction ratio ultra-high.
Ukuze kuqinisekiswe ikhono lokuguqula i-electro-optic modulator, ithimba liqale labonisa ukushintshashintsha kokudlulisa kwedivayisi nge-voltage ye-DC ku-wavelength yokusebenza. Kungabonakala ukuthi ngemva kwe-1 V, i-transmittance yehla kakhulu ngaphezu kwe-60 dB. Ngenxa yomkhawulo wezindlela zokubuka ze-oscilloscope ezivamile, ithimba locwaningo lisebenzisa indlela yokulinganisa ukuphazamiseka kwe-self-heterodyne, futhi lisebenzisa ububanzi obukhulu be-dynamic be-spectrometer ukuchaza isilinganiso sokuphela kwe-dynamic esiphezulu kakhulu se-modulator ngesikhathi sokuguqulwa kwe-pulse. Imiphumela yokuhlola ikhombisa ukuthi i-output light pulse ye-modulator inesilinganiso sokuphela esifinyelela ku-68 dB, kanye nesilinganiso sokuphela esingaphezu kuka-65 dB eduze kwezikhundla eziningana ze-resonant wavelength. Ngemuva kokubala okuningiliziwe, i-RF drive voltage yangempela elayishwe ku-electrode cishe i-1 V, kanti ukusetshenziswa kwamandla okuguqula kungama-3.6 mW kuphela, okuyi-oda ezimbili ngobukhulu ezincane kunokusetshenziswa kwamandla okuguqula kwe-AOM okujwayelekile.
Ukusetshenziswa kwe-modulator ye-electro-optic esekelwe ku-Silicon ohlelweni lwe-DAS kungasetshenziswa ohlelweni lwe-DAS lokuthola ngqo ngokufaka i-modulator ye-on-chip. Ngokungafani ne-interferometry ye-heterodyne ejwayelekile yesignali yendawo, imodi yokususa i-interferometry ye-Michelson interferometry engalingani iyasetshenziswa kulolu hlelo, ukuze umphumela wokushintsha kwemvamisa ye-optical we-modulator ungadingeki. Izinguquko zesigaba ezibangelwa amasignali okudlidliza e-sinusoidal zibuyiselwa ngempumelelo ngokususa amasignali ahlakazekile e-Rayleigh eziteshini ezi-3 kusetshenziswa i-algorithm yokususa i-IQ evamile. Imiphumela ikhombisa ukuthi i-SNR icishe ibe ngu-56 dB. Ukusatshalaliswa kobuningi be-spectral yamandla kulo lonke ubude be-fiber yenzwa ebangeni lemvamisa yesignali ±100 Hz kuyaphenywa kabanzi. Ngaphandle kwesignali evelele endaweni yokudlidliza kanye nemvamisa, kuyabonakala ukuthi kunezimpendulo ezithile zobuningi be-spectral yamandla kwezinye izindawo zendawo. Umsindo we-crosstalk ebangeni lika-±10 Hz nangaphandle kwendawo yokudlidliza ulinganiswa ngobude be-fiber, kanti i-SNR evamile esikhaleni ingaphansi kuka-33 dB.
Umfanekiso 2
umdwebo we-Schematic wesistimu yokuzwa i-acoustic esakazwa nge-optical fiber.
b Ubuningi be-spectral yamandla esignali obuncishisiwe.
c, d amaza okudlidliza eduze kokusatshalaliswa kobuningi be-spectral yamandla eceleni kwefayibha yokuzwa.
Lolu cwaningo lungolokuqala ukufeza i-modulator ye-electro-optical ku-silicon enesilinganiso sokuphela okuphezulu kakhulu (68 dB), futhi yasetshenziswa ngempumelelo ezinhlelweni ze-DAS, futhi umphumela wokusebenzisa i-modulator ye-AOM yezentengiselwano usondelene kakhulu, futhi usayizi kanye nokusetshenziswa kwamandla kuncane kakhulu kune-last, okulindeleke ukuthi kudlale indima ebalulekile esizukulwaneni esilandelayo sezinhlelo zokuzwa i-fiber ezincane, ezisatshalaliswa ngamandla aphansi. Ngaphezu kwalokho, inqubo yokukhiqiza enkulu ye-CMOS kanye nekhono lokuhlanganisa i-on-chip le-silicon-basedamadivayisi e-optoelectronickungakhuthaza kakhulu ukuthuthukiswa kwesizukulwane esisha samamojula ahlanganisiwe e-monolithic ashibhile, anamadivayisi amaningi asekelwe ezinhlelweni zokuzwa i-fiber ezisatshalaliswa kuma-chip.
Isikhathi sokuthunyelwe: Mashi-18-2025