Ib hom terahertz multiplexer tshiab tau ua rau muaj peev xwm ntawm cov ntaub ntawv ob npaug thiab txhim kho kev sib txuas lus 6G ntau dua nrog bandwidth tsis tau muaj dua thiab poob cov ntaub ntawv tsawg.
Cov kws tshawb nrhiav tau qhia txog lub super-wide band terahertz multiplexer uas ua rau muaj peev xwm ntawm cov ntaub ntawv ob npaug thiab coj kev nce qib tshiab rau 6G thiab dhau ntawd. (Duab los ntawm: Getty Images)
Kev sib txuas lus wireless tiam tom ntej, uas sawv cev los ntawm thev naus laus zis terahertz, cog lus tias yuav hloov pauv txoj kev xa cov ntaub ntawv.
Cov kab ke no ua haujlwm ntawm terahertz zaus, muab cov bandwidth tsis muaj qhov sib piv rau kev xa cov ntaub ntawv thiab kev sib txuas lus ceev heev. Txawm li cas los xij, txhawm rau kom ua tiav qhov peev xwm no, yuav tsum kov yeej cov teeb meem kev siv tshuab loj, tshwj xeeb tshaj yog hauv kev tswj hwm thiab siv cov spectrum muaj txiaj ntsig zoo.
Ib qho kev nce qib tshiab tau daws qhov teeb meem no: thawj ultra-wideband integrated terahertz polarization (de) multiplexer uas tau pom tseeb ntawm lub platform silicon uas tsis muaj substrate.
Tus qauv tsim tshiab no tsom mus rau sub-terahertz J band (220-330 GHz) thiab lub hom phiaj yog hloov kev sib txuas lus rau 6G thiab dhau ntawd. Lub cuab yeej no ua rau muaj peev xwm khaws cov ntaub ntawv tau ob npaug thaum tswj hwm tus nqi poob ntaub ntawv tsawg, uas yog txoj hauv kev rau cov tes hauj lwm wireless ceev ceev thiab ua haujlwm tau zoo.
Cov neeg ua haujlwm tom qab lub hom phiaj tseem ceeb no suav nrog Xibfwb Withawat Withayachumnankul los ntawm University of Adelaide's School of Electrical and Mechanical Engineering, Dr. Weijie Gao, uas tam sim no yog ib tus kws tshawb fawb postdoctoral ntawm Osaka University, thiab Xibfwb Masayuki Fujita.
Xibfwb Withayachumnankul tau hais tias, "Lub tshuab multiplexer polarization uas tau tsim tsa no tso cai rau ntau cov ntaub ntawv xa mus rau tib lub sijhawm hauv tib lub zaus band, ua rau muaj peev xwm ntawm cov ntaub ntawv ob npaug." Qhov bandwidth piv txwv uas lub cuab yeej ua tiav yog qhov tsis tau muaj dua li thoob plaws txhua qhov zaus, uas sawv cev rau qhov kev dhia loj rau cov multiplexers sib xyaw ua ke.
Cov polarization multiplexers yog qhov tseem ceeb hauv kev sib txuas lus niaj hnub no vim lawv ua rau ntau lub teeb liab sib koom ua ke tib lub zaus, ua rau muaj peev xwm ntawm cov channel zoo dua.
Lub cuab yeej tshiab ua tiav qhov no los ntawm kev siv cov conical directional couplers thiab anisotropic effective medium cladding. Cov khoom no txhim kho polarization birefringence, ua rau muaj polarization extinction ratio (PER) siab thiab dav bandwidth - cov yam ntxwv tseem ceeb ntawm cov kab ke sib txuas lus terahertz zoo.
Tsis zoo li cov qauv tsim ib txwm uas vam khom cov asymmetric waveguides uas nyuaj thiab nyob ntawm zaus, lub multiplexer tshiab siv anisotropic cladding nrog tsuas yog me ntsis zaus nyob ntawm. Txoj hauv kev no siv tag nrho cov bandwidth txaus los ntawm cov conical couplers.
Qhov tshwm sim yog qhov bandwidth fractional ze li ntawm 40%, qhov nruab nrab PER tshaj 20 dB, thiab qhov tsawg kawg nkaus ntawm kev nkag mus ntawm kwv yees li 1 dB. Cov ntsuas kev ua tau zoo no ntau dua li cov qauv kho qhov muag thiab microwave uas twb muaj lawm, uas feem ntau raug kev txom nyem los ntawm bandwidth nqaim thiab kev poob siab.
Cov haujlwm ntawm pab pawg tshawb fawb tsis yog tsuas yog ua kom cov txheej txheem terahertz ua haujlwm tau zoo xwb tab sis kuj tseem yog lub hauv paus rau lub sijhawm tshiab hauv kev sib txuas lus wireless. Dr. Gao tau hais tias, "Qhov kev tsim kho tshiab no yog tus tsav tsheb tseem ceeb hauv kev qhib lub peev xwm ntawm kev sib txuas lus terahertz." Cov ntawv thov suav nrog kev tshaj tawm video siab, kev muaj tiag augmented, thiab cov tes hauj lwm mobile tiam tom ntej zoo li 6G.
Cov kev daws teeb meem tswj kev sib hloov polarization terahertz ib txwm muaj, xws li cov transducers hom orthogonal (OMTs) raws li cov hlau waveguides rectangular, ntsib cov kev txwv loj heev. Cov hlau waveguides muaj kev poob ohmic ntau ntxiv ntawm cov zaus siab dua, thiab lawv cov txheej txheem tsim khoom nyuaj vim yog cov kev cai geometric nruj.
Cov khoom siv sib txuas lus polarization optical, suav nrog cov uas siv Mach-Zehnder interferometers lossis photonic crystals, muab kev sib koom ua ke zoo dua thiab txo qis kev poob tab sis feem ntau xav tau kev pauv pauv ntawm bandwidth, compactness, thiab kev nyuaj ntawm kev tsim khoom.
Cov couplers directional siv dav hauv cov tshuab kho qhov muag thiab xav tau lub zog polarization birefringence kom ua tiav qhov loj me me thiab PER siab. Txawm li cas los xij, lawv raug txwv los ntawm bandwidth nqaim thiab kev nkag siab rau kev tsim khoom.
Tus multiplexer tshiab muab cov txiaj ntsig ntawm cov conical directional couplers thiab cov khoom siv nruab nrab zoo sib xyaw ua ke, kov yeej cov kev txwv no. Lub anisotropic cladding qhia txog kev sib xyaw ua ke tseem ceeb, ua kom muaj PER siab thoob plaws qhov bandwidth dav. Lub hauv paus ntsiab lus tsim no yog qhov txawv ntawm cov txheej txheem ib txwm muaj, muab kev daws teeb meem scalable thiab siv tau rau kev koom ua ke terahertz.
Kev sim ua pov thawj ntawm lub multiplexer tau lees paub nws qhov kev ua tau zoo heev. Lub cuab yeej ua haujlwm tau zoo hauv 225-330 GHz, ua tiav qhov bandwidth ntawm 37.8% thaum tswj hwm PER siab dua 20 dB. Nws qhov loj me me thiab kev sib raug zoo nrog cov txheej txheem tsim khoom txheem ua rau nws tsim nyog rau kev tsim khoom loj.
Dr. Gao tau hais tias, "Qhov kev tsim kho tshiab no tsis yog tsuas yog ua kom cov kab ke sib txuas lus terahertz ua haujlwm tau zoo xwb tab sis kuj tseem ua rau muaj kev sib txuas lus wireless ceev ceev uas muaj zog thiab txhim khu kev qha dua."
Cov kev siv thev naus laus zis no muaj peev xwm nthuav dav tshaj li cov kab ke sib txuas lus. Los ntawm kev txhim kho kev siv spectrum, lub multiplexer tuaj yeem tsav kev nce qib hauv cov teb xws li radar, imaging, thiab Internet of Things. "Hauv ib xyoo caum, peb xav tias cov thev naus laus zis terahertz no yuav raug siv dav thiab koom ua ke thoob plaws ntau yam lag luam," Xibfwb Withayachumnankul tau hais.
Lub multiplexer kuj tseem tuaj yeem sib xyaw ua ke nrog cov khoom siv beamforming ua ntej uas pab pawg tau tsim, ua kom muaj kev sib txuas lus zoo dua ntawm lub platform sib koom ua ke. Qhov kev sib raug zoo no qhia txog qhov ua tau ntau yam thiab kev nthuav dav ntawm lub platform dielectric waveguide zoo.
Cov ntaub ntawv tshawb nrhiav ntawm pab neeg tau muab luam tawm hauv phau ntawv xov xwm Laser & Photonic Reviews, qhia txog lawv qhov tseem ceeb hauv kev txhim kho thev naus laus zis photonic terahertz. Xibfwb Fujita tau hais tias, "Los ntawm kev kov yeej cov teeb meem tseem ceeb ntawm kev siv tshuab, qhov kev tsim kho tshiab no yuav txhawb nqa kev txaus siab thiab kev tshawb fawb hauv thaj chaw no."
Cov kws tshawb nrhiav xav tias lawv txoj haujlwm yuav txhawb kom muaj cov ntawv thov tshiab thiab kev txhim kho thev naus laus zis ntxiv rau xyoo tom ntej, thaum kawg ua rau muaj cov qauv lag luam thiab cov khoom lag luam.
Lub multiplexer no sawv cev rau ib kauj ruam tseem ceeb rau pem hauv ntej hauv kev qhib lub peev xwm ntawm kev sib txuas lus terahertz. Nws teeb tsa tus qauv tshiab rau cov khoom siv terahertz sib xyaw nrog nws cov kev ntsuas kev ua tau zoo tsis tau muaj dua.
Raws li qhov kev thov rau cov tes hauj lwm sib txuas lus ceev ceev, muaj peev xwm loj hlob mus ntxiv, cov kev tsim kho tshiab no yuav ua lub luag haujlwm tseem ceeb hauv kev tsim kho yav tom ntej ntawm cov thev naus laus zis wireless.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-16-2024