Mu gushaka ubushobozi bwo hejuru no kurenza intera yo kohereza amakuru mu buryo bwa none bw’itumanaho ry’amajwi, urusaku, nk'imbogamizi nyamukuru y’umubiri, rwagiye rubangamira iterambere ry’imikorere.
Mu buryo busanzweEDFASisitemu yo gukuza fibre ikoresheje erbium, buri gice cy’itumanaho ry’urusaku rw’ingufu zituruka ku bushobozi bwo gutanga urumuri (ASE) bungana na 0.1dB, bushingiye ku miterere ya quantum idasanzwe y’urumuri/electron mu gihe cyo kongera imbaraga.
Ubwo bwoko bw'urusaku bugaragara nk'ihindagurika ry'igihe mu rwego rwa picosecond mu gice cy'igihe. Dukurikije uko icyitegererezo cya jitter cyabigaragaje, iyo habayeho ikigereranyo cy'ikwirakwira rya 30ps/(nm · km), ihindagurika ryiyongeraho 12ps iyo ryohereza 1000km. Mu gice cy'ihindagurika ry'urusaku, bituma ikigereranyo cy'urusaku kigabanuka (OSNR), bigatuma ubukana bwa 3.2dB (@ BER=1e-9) bugabanuka muri sisitemu ya 40Gbps NRZ.
Ikibazo gikomeye cyane gituruka ku guhuza ibintu bidafite umurongo umwe (dynamic coupling) n’ingaruka zidafite umurongo umwe (fibre nonlinear effects) - coefficient y’ikwirakwizwa rya fibre isanzwe (G.652) mu idirishya rya 1550nm ni 17ps/(nm · km), hamwe n’ihindagurika ry’impinduka riterwa na self phase modulation (SPM). Iyo imbaraga z’injira zirenze 6dBm, ingaruka za SPM zizahindura cyane imiterere y’impinduka.
Muri sisitemu ya 960Gbps PDM-16QAM igaragara ku ishusho iri hejuru, gufungura ijisho nyuma yo kohereza mu birometero 200 ni 82% by'agaciro k'ibanze, kandi Q factor iguma kuri 14dB (bihwanye na BER ≈ 3e-5); Iyo intera yagutse ikagera kuri 400km, ingaruka zihuriweho zo guhinduranya ibimenyetso (XPM) na four wave mixing (FWM) bituma urugero rwo gufungura ijisho rugabanuka cyane rukagera kuri 63%, kandi igipimo cy'amakosa ya sisitemu kirenga umupaka wo gukosora amakosa ya FEC wa 10 ^ -12.
Ni ngombwa kumenya ko ingaruka za frequency chirp za laser modulation (DML) zizarushaho kwiyongera - agaciro ka alpha parameter (linewidth enhancement factor) ka laser isanzwe ya DFB kari hagati ya 3-6, kandi impinduka zayo za frequency ako kanya zishobora kugera kuri ± 2.5GHz (bihuye na chirp parameter C=2.5GHz/mA) ku muvuduko wa modulation wa 1mA, bigatuma umuvuduko wo kwaguka kwa 38% (cumulative dispersion D · L=1360ps/nm) nyuma yo kohereza binyuze muri fibre ya G.652 ya 80km.
Uburyo bwo gukwirakwiza imiyoboro y'amashanyarazi mu buryo bwa WDM (wavelength division multiplexing) bugira imbogamizi zikomeye. Dufashe urugero rw'intera iri hagati y'imiyoboro ya 50GHz, imbaraga zo kubangamira ziterwa no kuvanga imiyoboro ine y'amashanyarazi (FWM) zifite uburebure bwa Leff bungana na kilometero 22 mu miyoboro isanzwe y'amashanyarazi.
Uburyo bwo gukwirakwiza imiyoboro y'amazi mu buryo bwa WDM (wavelength division multiplexing) bugira inzitizi zikomeye. Dufashe urugero rw'intera ya 50GHz, uburebure bw'imbaraga ziterwa no kuvanga imiyoboro ine (FWM) ni Leff = 22km (bihuye na coefficient ya fibre attenuation α = 0.22 dB / km).
Iyo imbaraga zinjiye zongerewe kugeza kuri + 15dBm, urwego rw'itumanaho hagati y'imiyoboro yegeranye rwiyongeraho 7dB (ugereranije n'ibanze -30dB), bigatuma sisitemu yongera ubusumbane bwo gukosora amakosa yo imbere (FEC) kuva kuri 7% kugeza kuri 20%. Ingaruka zo guhererekanya ingufu ziterwa no gukwirakwiza Raman (SRS) zituma habaho igihombo cya 0.02dB kuri kilometero mu miyoboro miremire y'uburebure, bigatuma ingufu zigabanuka kugeza kuri 3.5dB muri sisitemu ya C+L (1530-1625nm). Inyungu yo kugabanya uburebure mu gihe nyacyo irakenewe binyuze mu gupima ubwiza (DGE).
Umupaka w'imikorere ya sisitemu y'izi ngaruka zifatika hamwe ushobora gupimwa hakoreshejwe intera ya bandwidth (B · L): B · L ya sisitemu isanzwe ya NRZ modulation muri fibre ya G.655 (fibre itangwa na dispersion) ni hafi 18000 (Gb/s) · km, mu gihe hakoreshejwe modulation ya PDM-QPSK na coherent detection technology, iki kimenyetso gishobora kongerwa kikagera kuri 280000 (Gb/s) · km (@ SD-FEC gain 9.5dB).
Fibre ya SDM (SDM) ifite ubushobozi bwo kohereza amakuru bwa 15.6Pb/s · km (ubushobozi bwa fibre imwe ya 1.53Pb/sx intera yo kohereza amakuru ya 10.2km) mu bidukikije bya laboratwari binyuze mu buryo budakomeye bwo guhuza hagati y’imirongo (<-40dB/km).
Kugira ngo twegere umupaka wa Shannon, sisitemu zigezweho zigomba gukoresha hamwe uburyo bwo gushushanya (PS-256QAM, kugera ku kwiyongera kwa 0.8dB), uburinganire bw'imiyoboro y'ubwonko (imikorere myiza ya NL yazamuweho 37%), no gukwirakwiza ikoranabuhanga rya Raman amplification (DRA, ubwiza bw'imiterere y'umurambararo ± 0.5dB) kugira ngo twongere Q factor ya transmission ya 400G PDM-64QAM imwe na 2dB (kuva kuri 12dB kugeza kuri 14dB), kandi tugabanya ubushobozi bwo kwihanganira OSNR kugeza kuri 17.5dB/0.1nm (@ BER=2e-2).
Igihe cyo kohereza: Kamena-12-2025