Ifayibha esemgangathweni ifezekisa irekhodi lebhanwidth yehlabathi, igqitha iyonke itrafikhi ye-Intanethi yehlabathi

Iqela lophando elivela kwiZiko loPhando lweNethiwekhi yeZiko leSizwe loLwazi kunye nobuChwepheshe boNxibelelwano laseJapan (NICT) liphumelele irekhodi elitsha lebhanwidth yehlabathi ye-1.53 ​​Pbit/s kwi-diameter optical fiber eqhelekileyo. Oku kuthetha ukuba itrafiki ye-Intanethi yehlabathi inokungena kuyo.
Ukuqhubela phambili okufanayo kwaxelwa kwisiqingatha senyanga edlulileyo: i-bandwidth ye-1.84 Pbit / s yaphunyezwa nge-laser enye kunye ne-chip eyodwa ye-optical, ixabiso eliphezulu kunokuba liphunyezwe yi-NICTs, kodwa ingxaki yayo kukuba isazama. Iichips zefotoni kwinqanaba loyilo, ngoko ke olu phando lwe-NTIC lunokuphunyezwa kwangaphambili.

01

Itekhnoloji ye-Multiplexing: ukufikelela kwi-bandwidth yerekhodi ye-1.53 ​​Pbit / s
Abaphandi baphumelele i-bandwidth emalunga ne-1.53 ​​Pbit / s ngokufaka ikhowudi yolwazi kwii-55 ezahlukeneyo ze-optical frequencies (indlela eyaziwa ngokuba yi-multiplexing). Oko kwanele ukuba i-bandwidth ithwale yonke i-intanethi ye-intanethi (iqikelelwa ngaphantsi kwe-1 Pbit / s) phezu kwentambo enye ye-fiber optic: amaxesha esigidi asebenzayo ngaphezu koqhagamshelwano lwe-Gbit (kwezona meko) umntu ophakathi anazo.
Itekhnoloji isebenza ngokuthatha ithuba lezandi ezahlukeneyo zokukhanya kwi-spectrum. Ekubeni "umbala" ngamnye kwi-spectrum (ebonakalayo kwaye engabonakaliyo) ine-frequency yayo: ngokungafaniyo nazo zonke ezinye iifrikhwensi, inokuthwala ukuhamba kwayo okuzimeleyo kolwazi. Abaphandi bakwazile ukuvula ukusebenza kakuhle kwe-spectral ye-332 bits / s / Hz (iibhithi ngesibini ngeHertz); oku kuphindwe kathathu kunomzamo walo wangaphambili ongcono ngo-2019 - ukuphumelela kokuphumelela kwe-spectral ye-105 bits / s / Hz.

02
Ukusekwa kovavanyo: Ukuhanjiswa kolwazi lwe-C-band kwi-184 yamaza ahlukeneyo
Abaphandi bakwazile ukuhambisa ulwazi lwe-C-band kwi-184 yamaza ahlukeneyo: ezi zizimeleyo, iifrikhwensi ezingahambelaniyo zisetyenziselwa ukuhambisa ulwazi ngaxeshanye ngaphakathi kwentambo ye-fiber optic. Ukukhanya kumodareyithwa ukuhambisa imijelo ehlukeneyo ye-55 (iipateni) zedatha ngaphambi kokuba ithunyelwe phantsi kwentambo ye-fiber optic. Nje ukuba imodareyithwe (njengeentambo ezininzi zefiber optic ezibekwe ngoku), kufuna undoqo weglasi ukuthwala yonke idatha. Njengoko idatha ithunyelwa (igubungela i-184 wavelengths kunye ne-55 modes), umamkeli unquma ubude obuhlukeneyo kunye neendlela zokuqokelela idatha yayo. Kuvavanyo, umgama phakathi komthumeli kunye nomamkeli usetelwe kwi-25.9 km.

① Umthombo we-optical comb: I-184 abathwali benziwa kwi-optical comb source. ②Ukuguquguquka komqondiso. Umthwali ulungelelaniswe nge-16 QAM kunye ne-polarization multiplexed signals. ③ Ukuveliswa kophawu olunxuseneyo. Iimpawu zendlela nganye zifakwe ngefolokhwe kwaye ukulibaziseka kwendlela kusetyenziswa ukulinganisa ukuhamba kwedatha okuzimeleyo. ④ indlela yokuphindaphinda. Umqondiso ngamnye uguqulelwa kwimodi yendawo eyahlukileyo kwaye ithunyelwe kwi-fiber ye-55-mode. ⑤ I-fiber ye-55 yemodi. Umqondiso usasaza kwimodi ye-25.9 yeekhilomitha ubude be-55 fiber. ⑥ Imowudi ye-Demultiplexer. Kumamkeli, isignali evela kwimowudi yendawo nganye iyahlulwa kwaye iguqulelwe kwimo esisiseko. ⑦ Isantya esiphezulu se-parallel receiver. Imowudi ye-demultiplexed signal i-wavelength-demultiplexed sisihluzo kwaye iguqulelwe kumqondiso wombane ngumamkeli ohambelanayo ohambelanayo. ⑧ Ukusetyenzwa komqondiso ngaphandle kweintanethi. Ukusetyenzwa kwe-MIMO ukuphelisa ukuphazamiseka kwesignali ngexesha lokusasazwa kwefayibha.

Iziphumo zovavanyo zibonisa ukuba nangona ireyithi yedatha yehla kancinane kwisiphelo sobude bexesha elide le-C-band (malunga ne-1565 nm), izinga ledatha elizinzileyo neliphantse lifane lifunyenwe kwezinye iingingqi ze-wavelength, lifikelela kwi-1.53 ​​Pbit/s emva koko. impazamo. ukulungiswa