Ekuphishekeleni umthamo ophakeme kanye nebanga elide lokudlulisela ezimisweni zokuxhumana zesimanjemanje, umsindo, njengomkhawulo oyisisekelo womzimba, ubulokhu ucindezela ukuthuthukiswa kokusebenza.
Ngo ejwayelekileEDFAi-erbium-doped fiber amplifier system, isikhathi ngasinye sokudlulisa amehlo khiqiza cishe u-0.1dB womsindo ophumayo ozenzakalelayo (ASE), osekelwe ku-quantum yemvelo engahleliwe yokuxhumana kokukhanya/kwe-electron phakathi nenqubo yokukhulisa.
Lolu hlobo lomsindo lubonakala njenge-picosecond timing jitter esizindeni sesikhathi. Ngokwesibikezelo semodeli ye-jitter, ngaphansi kwesimo se-coefficient yokuhlakazeka engu-30ps/(nm · km), i-jitter inyuka ngo-12ps uma idlulisela u-1000km. Esizindeni semvamisa, kuholela ekwehleni kwesilinganiso se-signal-to-noise ratio (OSNR), okuholela ekulahlekelweni kokuzwela kwe-3.2dB (@ BER=1e-9) ohlelweni lwe-40Gbps NRZ.
Inselele enzima kakhulu ivela ekuhlanganisweni okuguquguqukayo kwemiphumela ye-fiber engaqondile kanye nokuhlakazwa - i-coefficient yokuhlakazwa ye-fiber yemodi eyodwa evamile (G.652) efasiteleni elingu-1550nm ngu-17ps/(nm · km), kuhlanganiswe nokushintshwa kwesigaba esingaqondile okubangelwa ukuzishintsha kwesigaba se-self (SPM). Uma amandla okokufaka edlula u-6dBm, umphumela we-SPM uzohlanekezela ngokuphawulekayo i-pulse waveform.
Kuhlelo lwe-960Gbps PDM-16QAM oluboniswe esithombeni esingenhla, ukuvulwa kwamehlo ngemva kokudluliselwa kwe-200km yi-82% yenani lokuqala, futhi i-Q factor igcinwa ku-14dB (ehambisana ne-BER ≈ 3e-5); Uma ibanga linwetshwa libe ngu-400km, umphumela ohlanganisiwe we-cross phase modulation (XPM) kanye ne-four wave mixing (FWM) ibangela ukuthi izinga lokuvula iso lehle kakhulu liye ku-63%, futhi izinga lephutha lesistimu lidlula isinqumo esinzima se-FEC umkhawulo wokulungisa iphutha lika-10 ^ -12.
Kuyaphawuleka ukuthi umphumela wokutshiyoza kwe-frequency ye-direct modulation laser (DML) uzoba kubi kakhulu - inani le-alpha (linewidth enhanced factor) lelaser ye-DFB ejwayelekile likububanzi obungu-3-6, futhi ukuguqulwa kwayo kwemvamisa okuzenzakalelayo kungafinyelela ku-± 2.5GHz (okuhambisana nepharamitha yokutshiyoza C=2.51GHz/mA yamanje yomphumela we-ampulthi ye-ampul) izinga lokunweba lama-38% (i-cumulative dispersion D · L=1360ps/nm) ngemva kokudlulisela nge-80km G.652 fiber.
I-Crosstalk yesiteshi kumasistimu we-wavelength division multiplexing (WDM) yenza izithiyo ezijulile. Uma sithatha isikhala sesiteshi esingu-50GHz njengesibonelo, amandla okuphazamiseka okubangwa ukuxubana kwamagagasi amane (FWM) anobude obusebenzayo obungu-Leff obungaba ngu-22km kumafiber optical ajwayelekile.
I-Crosstalk yesiteshi kumasistimu we-wavelength division multiplexing (WDM) yenza izithiyo ezijulile. Uma sithatha isikhala sesiteshi esingu-50GHz njengesibonelo, ubude obusebenzayo bamandla okuphazanyiswa akhiqizwa ukuxubana kwamagagasi amane (FWM) yi-Leff=22km (okuhambisana ne-fiber attenuation coefficient α=0.22 dB/km).
Uma amandla okufaka anyuswa abe ngu-+15dBm, izinga le-crosstalk phakathi kweziteshi eziseduze likhuphuka ngo-7dB (ngokuhlobene nesisekelo -30dB), okuphoqa uhlelo ukuthi lukhulise ukulungiswa kwephutha langaphambili (i-FEC) ukuphindaphinda kusuka ku-7% kuya ku-20%. Umthelela wokudlulisa amandla obangelwa ukuhlakazeka kwe-Raman (SRS) okukhuthazwayo kuphumela ekulahlekeni okucishe kube ngu-0.02dB ngekhilomitha kumashaneli amade wamaza, okuholela ekucwilisweni kwamandla afika ku-3.5dB ohlelweni lwebhendi ye-C+L (1530-1625nm). Isinxephezelo seslope sesikhathi sangempela siyadingeka nge-dynamic gain equalizer (DGE).
Umkhawulo wokusebenza kwesistimu wale miphumela ebonakalayo uhlanganisiwe ungalinganiswa ngomkhiqizo webanga lomkhawulokudonsa (B · L): i-B · L yesistimu ye-modulation ye-NRZ evamile ku-G.655 fiber (i-dispersion compensated fiber) icishe ibe yi-18000 (Gb/s) · km, kuyilapho nge-PDM-QPSK ukumodemu kanye nobuchwepheshe bokubona obuhambisanayo, le nkomba ingaba yi-0 G. I-SD-FEC ithola i-9.5dB).
I-Cutting-Edge 7-core x 3-mode space division multiplexing fiber (SDM) ifinyelele umthamo wokudlulisa we-15.6Pb/s · km (umthamo wefayibha eyodwa we-1.53Pb/sx ibanga lokudlulisela elingu-10.2km) ezindaweni zaselabhorethri ngokusebenzisa ukuhlangana okubuthakathaka kokulawula i-inter core crosstalk control (<-km40d).
Ukuze usondele emkhawulweni we-Shannon, izinhlelo zesimanje zidinga ngokuhlanganyela zamukele ukubunjwa okungenzeka (PS-256QAM, ukuzuza inzuzo yokuma engu-0.8dB), ukulingana kwenethiwekhi ye-neural (ukusebenza kahle kwesinxephezelo se-NL kuthuthukiswe ngo-37%), kanye nokusabalalisa i-Raman amplification (DRA, ukuthola ukunemba komthambeka ± 0.5dB) ukukhuphula ubuchwepheshe benkampani yenethiwekhi eyodwa ye-Q400 ye-Q40 Ukudluliselwa kwe-PDM-64QAM ngo-2dB (kusuka ku-12dB kuya ku-14dB), futhi ukhulule ukubekezelela kwe-OSNR kuye ku-17.5dB/0.1nm (@ BER=2e-2).
Isikhathi sokuthumela: Jun-12-2025