I-fiber ejwayelekile ifinyelela irekhodi lomhlaba wonke le-bandwidth, idlula ithrafikhi ye-inthanethi yomhlaba wonke.

Ithimba locwaningo elivela kwi-Network Research Institute of Japan's National Institute of Information and Communications Technology (NICT) lifinyelele irekhodi elisha lomhlaba wonke le-bandwidth elingu-1.53 ​​Pbit/s ku-fiber optical enobubanzi obujwayelekile. Lokhu kusho ukuthi yonke ithrafikhi ye-inthanethi yomhlaba wonke ingangena ngaphakathi kwayo.
Impumelelo efanayo ibikwe emasontweni amabili edlule: i-bandwidth engu-1.84 Pbit/s ifinyelelwe nge-laser eyodwa kanye ne-chip eyodwa ye-optical, inani eliphakeme kunelifinyelelwe yi-ICT, kodwa inkinga ukuthi isahlolwa. Ama-chip e-Photonic asesigabeni sokuklama; ngakho-ke, lolu cwaningo lwe-ICT lungasetshenziswa ngokushesha.

01

Ubuchwepheshe be-Multiplexing: finyelela i-bandwidth yerekhodi engu-1.53 ​​Pbit/s
Abacwaningi bathole i-bandwidth engaba ngu-1.53 ​​Pbit/s ngokufaka ulwazi kuma-frequency angama-55 ahlukene optical (indlela eyaziwa ngokuthi i-multiplexing). Lokho bandwidth kwanele ukuthwala yonke ithrafikhi ye-inthanethi yomhlaba (elinganiselwa ngaphansi kwe-1 Pbit/s) ngekhebula elilodwa le-fiber optic—okuphindwe izikhathi eziyisigidi kunokuxhumeka kwe-gigabit (okungcono kakhulu) umuntu ovamile anakho.
Lobu buchwepheshe busebenza ngokusebenzisa amaza okukhanya ahlukene kulo lonke i-spectrum. Njengoba "umbala" ngamunye ku-spectrum (obonakalayo nongabonakali) unomvamisa wawo, ngokungafani nawo wonke amanye amaza omsindo, ungathwala ulwazi lwawo oluzimele. Abacwaningi bathole ukusebenza kahle kwe-spectral okungu-332 bits/s/Hz (ama-bits ngomzuzwana nge-Hertz), okuphindwe kathathu kunomzamo wabo wangaphambilini omuhle kakhulu ngo-2019, okwathola ukusebenza kahle kwe-spectral okungu-105 bits/s/Hz.

02
Ukusethwa kokuhlola: Ukudluliswa kolwazi lwe-C-band kuma-wavelengths angu-184 ahlukene
Abacwaningi badlulise ngempumelelo ulwazi lwe-C-band kuwo wonke ama-wavelength angu-184 ahlukene: lawa ma-frequency azimele, angahlangani asetshenziselwa ukudlulisa ulwazi ngasikhathi sinye ngaphakathi kwekhebula le-fiber optic. Ukukhanya kuguqulwa ukuze kudluliswe imifudlana (amaphethini) angu-55 ahlukene yedatha ngaphambi kokuba kuthunyelwe ngekhebula le-fiber optic. Uma sekulungisiwe (njengezintambo eziningi ze-fiber optic ezisetshenziswa njengamanje), kudinga umongo wengilazi ukuze kuthwale yonke idatha. Njengoba idatha (ehlanganisa ama-wavelength angu-184 kanye nezindlela ezingu-55) ithunyelwa, umamukeli unquma ama-wavelength ahlukene kanye nezindlela ukuze aqoqe idatha yakhe. Kulolu cwaningo, ibanga phakathi komthumeli kanye nomamukeli lalinqunyelwe ku-25.9 km.

① Umthombo wekamu lokubona: Izithwali ezingu-184 zikhiqizwa emthonjeni wekamu lokubona. ② Ukuguqulwa kwesignali: Isithwali silungiswa ngezibonakaliso ezingu-16 ze-QAM kanye ne-multiplexed polarization. ③ Ukukhiqizwa kwesignali ehambisanayo: Izibonakaliso zemodi ngayinye ziyahlukaniswa, futhi ukubambezeleka kwendlela kusetshenziswa ukulingisa ukusakazwa kwedatha okuzimele. ④ I-multiplexer yemodi: Isignali ngayinye iguqulwa ibe yimodi ehlukile yendawo bese ithunyelwa ku-fiber yemodi engu-55. ⑤ i-fiber yemodi engu-55: Isignali isakazeka ku-fiber yemodi engu-55 engamakhilomitha angu-25.9 ubude. ⑥ I-demultiplexer yemodi: Ku-receiver, isignali ihlukaniswa ibe yimodi ngayinye yendawo bese iguqulwa ibe yimodi eyisisekelo. ⑦ Umamukeli wejubane eliphezulu ohambisanayo: Isignali yemodi ehlukanisweyo ihlukaniswa ubude be-wavelength ngesihlungi bese iguqulwa ibe yisignali kagesi yisamukeli esihambisanayo esihambisanayo. ⑧ Ukucubungula isignali engaxhunyiwe ku-inthanethi. Ukucubungula i-MIMO ukuze kuqedwe ukuphazamiseka kwesignali ngesikhathi sokusabalala kwe-fiber.

Imiphumela yokuhlola ikhombisa ukuthi nakuba izinga ledatha lehla kancane ekugcineni kobude be-wavelength be-C band (cishe u-1565 nm), izinga ledatha elizinzile nelicishe lifane liyatholakala kwezinye izifunda zobude be-wavelength, lifinyelela inani eliphelele elingu-1.53 ​​Pbit/s ngemva kokulungiswa kwephutha.