Okona kumvai-electro-optic modulator yomlinganiselo wokuphela ophezulu kakhulu
Ii-modulators ze-electro-optical ezikwi-chip (ezisekwe kwi-silicon, i-triquinoid, i-thin film lithium niobate, njl.njl.) zinezibonelelo zokuba ncinci, isantya esiphezulu kunye nokusetyenziswa kwamandla aphantsi, kodwa kusekho imingeni emikhulu yokufezekisa i-dynamic intensity modulation ene-ultra-high extinction ratio. Kutshanje, abaphandi kwiZiko loPhando elidibeneyo le-Fiber Optic Sensing kwiyunivesithi yaseTshayina benze inkqubela phambili enkulu kwicandelo le-ultra-high extinction ratio electro-optical modulators kwi-silicon substrates. Ngokusekelwe kwisakhiwo sesihluzo se-optical esikwi-high order, i-on-chip siliconi-electro-optic modulatorkunye nomlinganiselo wokuphela kwe-68 dB uqatshelwa okokuqala. Ubungakanani kunye nokusetyenziswa kwamandla kuncinci kakhulu kunoko kwemveli.Imodulator ye-AOM, kwaye ukuba kunokwenzeka na ukusetyenziswa kwesi sixhobo kuqinisekisiwe kwinkqubo ye-DAS yelebhu.
Umfanekiso 1 Umzobo weskimu wesixhobo sovavanyo lwe-ultrai-electro-optic modulator yomlinganiselo ophezulu wokuphela
Isekelwe kwi-siliconi-modulator ye-electro-opticalNgokusekelwe kwisakhiwo sesihluzo se-microring esidibeneyo sifana nesihluzo sombane seklasikhi. I-electro-optic modulator ifikelela kwi-flat bandpass filter kunye ne-high out-of-band rejection ratio (>60 dB) ngokusebenzisa uthotho lwe-resonators ezine ze-silicon-based microring. Ngoncedo lwe-Pin-type electro-optical phase shifter kwi-microring nganye, i-transmittance spectrum ye-modulator inokutshintshwa kakhulu kwi-voltage ephantsi esetyenzisiweyo (<1.5 V). I-high out of band rejection ratio edityaniswe ne-steep filter roll-down characteristic yenza ukuba amandla okukhanya okufakwayo kufutshane ne-resonant wavelength aguqulwe ngomahluko omkhulu kakhulu, okulungele kakhulu ukuvelisa ii-ultra-high extinction ratio light pulses.
Ukuqinisekisa amandla okuguqula i-electro-optic modulator, iqela liqale labonisa umahluko wokudluliselwa kwesixhobo kunye ne-DC voltage kubude be-operating wavelength. Kuyabonakala ukuba emva kwe-1 V, ukudluliselwa kwehla kakhulu ngaphezulu kwe-60 dB. Ngenxa yokuthintelwa kweendlela zokujonga ze-oscilloscope eziqhelekileyo, iqela lophando lisebenzisa indlela yokulinganisa ukungenelela kwe-self-heterodyne, kwaye lisebenzisa uluhlu olukhulu lwe-dynamic lwe-spectrometer ukuchaza umlinganiselo we-ultra-high dynamic extinction we-modulator ngexesha le-pulse modulation. Iziphumo zovavanyo zibonisa ukuba i-output light pulse ye-modulator inomlinganiselo wokuphela ofikelela kwi-68 dB, kunye nomlinganiselo wokuphela ongaphezulu kwe-65 dB kufutshane neendawo ezininzi ze-resonant wavelength. Emva kokubala okuneenkcukacha, i-RF drive voltage yokwenyani elayishwe kwi-electrode imalunga ne-1 V, kwaye ukusetyenziswa kwamandla okuguqulwa yi-3.6 mW kuphela, nto leyo engaphantsi kwe-odolo ezimbini kunokusetyenziswa kwamandla okuguqulwa kwe-AOM modulator eqhelekileyo.
Ukusetyenziswa kwe-electro-optic modulator esekwe kwiSilicon kwinkqubo ye-DAS kunokusetyenziswa kwinkqubo ye-DAS yokubona ngqo ngokupakisha i-on-chip modulator. Ngokungafaniyo ne-interferometry ye-local-signal heterodyne general, i-demodulation mode ye-non-balanced Michelson interferometry iyasetyenziswa kule nkqubo, ukuze isiphumo sokutshintsha kwe-optical frequency ye-modulator singadingeki. Utshintsho lwesigaba olubangelwa ziisignali zokungcangcazela ze-sinusoidal lubuyiselwa ngempumelelo ngokususwa kweesignali ezisasazekileyo zeRayleigh zeziteshi ezi-3 kusetyenziswa i-algorithm ye-IQ demodulation eqhelekileyo. Iziphumo zibonisa ukuba i-SNR imalunga ne-56 dB. Ukusasazwa koxinano lwamandla e-spectral kubude bonke be-sensor fiber kuluhlu lwe-signal frequency ±100 Hz kuyaphandwa ngakumbi. Ngaphandle kwesignali evelele kwindawo yokungcangcazela kunye ne-frequency, kuqatshelwe ukuba kukho iimpendulo ezithile zoxinano lwamandla e-spectral kwezinye iindawo zesithuba. Ingxolo ye-crosstalk kuluhlu lwe-±10 Hz nangaphandle kwendawo yokungcangcazela ilinganiselwa kubude be-fiber, kwaye i-SNR ephakathi kwindawo ingaphantsi kwe-33 dB.
Umfanekiso 2
umzobo weSchematic wenkqubo yokuva i-acoustic esasazwe nge-optical fiber distributed.
b Uxinano lwespectral yamandla esignali edityanisiweyo.
c, d iifrikhwensi zokungcangcazela kufutshane nosasazo loxinano lwamandla e-spectral ecaleni kwefayibha yokuva.
Olu phononongo lolokuqala ukufezekisa i-electro-optical modulator kwi-silicon ene-ultra-high extinction ratio (68 dB), kwaye isetyenziswe ngempumelelo kwiinkqubo ze-DAS, kwaye isiphumo sokusebenzisa i-modulator ye-AOM yorhwebo sisondele kakhulu, kwaye ubungakanani kunye nokusetyenziswa kwamandla kuncinci kakhulu kune-last, okulindeleke ukuba kudlale indima ephambili kwisizukulwana esilandelayo seenkqubo ze-fiber sensing ezincinci, ezisasazwa ngamandla aphantsi. Ukongeza, inkqubo yokuvelisa enkulu ye-CMOS kunye nokukwazi ukuhlanganisa i-on-chip kwe-silicon-basedizixhobo ze-optoelectronicinokukhuthaza kakhulu uphuhliso lwesizukulwana esitsha seemodyuli ezidityanisiweyo ze-monolithic ezingabizi kakhulu, ezisebenzisa izixhobo ezininzi ezisekelwe kwiinkqubo zokuva iifayibha ezisasazwa kwiitship.
Ixesha leposi: Matshi-18-2025