Ulusi wamba wafika pa mbiri yapadziko lonse ya bandwidth, kupitirira kuchuluka kwa anthu omwe amafika pa intaneti padziko lonse lapansi

Gulu lofufuza kuchokera ku Network Research Institute of Japan's National Institute of Information and Communications Technology (NICT) lapeza mbiri yatsopano padziko lonse ya bandwidth ya 1.53 Pbit/s pa ulusi wowala wa diameter wamba. Izi zikutanthauza kuti kuchuluka kwa anthu padziko lonse lapansi pa intaneti kungagwirizane nayo.
Kupambana kofananako kunanenedwa milungu iwiri yapitayo: bandwidth ya 1.84 Pbit/s idapezeka ndi laser imodzi ndi chip imodzi yowunikira, mtengo wokwera kuposa womwe udapezeka ndi ma ICT, koma vuto ndilakuti ikadali yoyeserera. Ma chip a Photonic ali mu gawo lopangidwa; chifukwa chake, kafukufuku wa ICT uwu ukhoza kuyambitsidwa posachedwa.

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Ukadaulo wa Multiplexing: kupeza bandwidth yodziwika bwino ya 1.53 Pbit/s
Ofufuzawa adapeza bandwidth ya pafupifupi 1.53 Pbit/s mwa kulemba chidziwitsocho m'ma frequency 55 osiyanasiyana a kuwala (njira yotchedwa multiplexing). bandwidth imeneyo ndi yokwanira kunyamula magalimoto onse a intaneti padziko lonse lapansi (omwe akuyerekezeredwa kuti ndi ochepera 1 Pbit/s) kudzera mu chingwe chimodzi cha fiber optic - chogwira ntchito kwambiri nthawi miliyoni kuposa kulumikizana kwa gigabit (kwabwino kwambiri) komwe munthu wamba ali nako.
Ukadaulowu umagwira ntchito pogwiritsa ntchito ma frequency osiyanasiyana a kuwala pa sipekitiramu. Popeza "mtundu" uliwonse mu sipekitiramu (wooneka ndi wosaoneka) uli ndi ma frequency akeake, mosiyana ndi ma frequency ena onse, ukhoza kukhala ndi mtsinje wake wodziyimira pawokha wa chidziwitso. Ofufuzawa adapeza mphamvu ya spectral ya 332 bits/s/Hz (bits pa sekondi iliyonse pa Hertz), yokwera katatu kuposa momwe adayesera kale mu 2019, yomwe idapeza mphamvu ya spectral ya 105 bits/s/Hz.

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Kukhazikitsa koyesera: Kutumiza chidziwitso cha C-band pa mafunde 184 osiyanasiyana
Ofufuzawa adakwanitsa kutumiza chidziwitso cha C-band kudzera mu mafunde 184 osiyanasiyana: ma frequency odziyimira pawokha, osalumikizana amagwiritsidwa ntchito kutumiza chidziwitso nthawi imodzi mkati mwa chingwe cha fiber optic. Kuwalako kumasinthidwa kuti kutumize mitsinje 55 yosiyana (mawonekedwe) a deta musanatumizidwe kudzera mu chingwe cha fiber optic. Mukasinthidwa (monga ma waya ambiri a fiber optic omwe akugwiritsidwa ntchito pano), pamafunika pakati pagalasi kuti munyamule deta yonse. Pamene deta (yomwe ili ndi mafunde 184 ndi ma mode 55) ikutumizidwa, wolandila amasankha mafunde ndi ma mode osiyanasiyana kuti asonkhanitse deta yake. Mu kuyeseraku, mtunda pakati pa chotumizira ndi wolandila unali wokhazikika pa 25.9 km.

① Gwero la chisa cha kuwala: Zonyamulira 184 zimapangidwa mu gwero la chisa cha kuwala. ② Kusintha kwa chizindikiro: Chonyamuliracho chimasinthidwa ndi zizindikiro 16 za QAM ndi kugawa kwa multiplexed. ③ Kupanga chizindikiro chofanana: Zizindikiro za mtundu uliwonse zimagawika, ndipo kuchedwa kwa njira kumayikidwa kuti ziyerekezere mitsinje yodziyimira payokha ya data. ④ Kuchulukitsa mawonekedwe: Chizindikiro chilichonse chimasinthidwa kukhala njira yosiyana ya malo ndikutumizidwa ku ulusi wa 55-mode. ⑤ Ulusi wa 55-mode: Chizindikirocho chimafalikira mu ulusi wa 55-mode wa makilomita 25.9. ⑥ Kuchotsa mawonekedwe: Pa wolandila, chizindikirocho chimalekanitsidwa mu njira iliyonse ya malo ndikusinthidwa kukhala njira yoyambira. ⑦ Wolandila wothamanga kwambiri: Chizindikiro chopanda mawonekedwe chimachotsedwa mawonekedwe ndi fyuluta ndikusinthidwa kukhala chizindikiro chamagetsi ndi wolandila wogwirizana wofanana. ⑧ Kukonza chizindikiro chopanda intaneti. Kukonza MIMO kuti athetse kusokoneza kwa chizindikiro panthawi yofalitsa ulusi.

Zotsatira zoyeserera zikusonyeza kuti ngakhale kuti kuchuluka kwa deta kumatsika pang'ono kumapeto kwa kutalika kwa mafunde a C band (pafupifupi 1565 nm), kuchuluka kwa deta kokhazikika komanso kofanana kumapezeka m'madera ena a mafunde, kufika pa 1.53 Pbit/s pambuyo pokonza zolakwika.