Muri sisitemu ya EPON, OLT ihujwe na ONU nyinshi (imiyoboro ya optique) binyuze muri POS (pasitike optique itandukanya).Nka nkingi ya EPON, OLT optique modules izagira ingaruka kumikorere ya sisitemu ya 10G EPON yose.
1.Iriburiro rya 10G EPON ihuza OLT optique module
Moderi ya 10G EPON ihuza OLT optique ikoresha uplink guturika kwakirwa no kumanura uburyo bwo guhererekanya ibintu, bikoreshwa cyane muburyo bwo guhinduranya optique / amashanyarazi muri sisitemu ya 10G EPON.
Igice cyo kwakira kigizwe na TIA (transimpedance amplifier), APD (Avalanche Photodiode) kuri 1270 / 1310nm, na LA ebyiri (zigabanya amplifier) kuri 1.25 na 10.3125 Gbit / s.
Impera yohereza igizwe na 10G EML (lazeri ya electro-absorption modulation laser) na 1.25 Gbit / s DFB (yatanzweho laser), naho uburebure bwayo bwohereza ni 1577 na 1490nm.
Umuzunguruko utwara ibinyabiziga urimo sisitemu ya APC (Automatic Optical Power Control) umuzenguruko hamwe na TEC (Temperature Compensation) umuzenguruko wo gukomeza umurongo wa 10G uhumanya ikirere.Gukurikirana no kwakira ibipimo byo kugenzura bishyirwa mubikorwa na chip microcomputer imwe ukurikije protocole ya SFF-8077iv4.5.
Kuberako kwakira iherezo rya OLT optique module ikoresha kwakirwa, igihe cyo kwakira igihe ni ngombwa cyane.Niba kwakira igihe cyo gutuza ari birebire, bizagira ingaruka cyane kubyiyumvo, ndetse birashobora no gutuma kwakirwa guturika bidakora neza.Ukurikije ibisabwa muri protocole ya IEEE 802.3av, igihe cyo gushiraho 1.25Gbit / s cyakiriwe kigomba kuba <400 ns, kandi ibyiyumvo byakira byakagombye kuba <-29.78 dBm hamwe nikosa rito rya 10-12;na 10.3125 Gbit / s Igihe cyo kwakirwa cyo guturika kigomba kuba <800ns, kandi ibyiyumvo byo kwiyakira bigomba kuba <-28.0 dBm hamwe nikosa rito rya 10-3.
2.10G EPON ibangikanye na OLT optique module igishushanyo
2.1 Igishushanyo mbonera
Moderi ya 10G EPON ihuriweho na OLT optique igizwe na triplexer (module imwe-fibre-module eshatu), kohereza, kwakira, no gukurikirana.Triplexer irimo laseri ebyiri na detector.Umucyo woherejwe hamwe numucyo wakiriwe byinjijwe mubikoresho bya optique binyuze muri WDM (Wavelength Division Multiplexer) kugirango ugere kuri fibre imwe.Imiterere yacyo irerekanwa mu gishushanyo 1.
Igice cyohereza kigizwe na laseri ebyiri, umurimo wacyo nyamukuru ni uguhindura ibimenyetso byamashanyarazi 1G na 10G mubimenyetso bya optique, hamwe no gukomeza ingufu za optique mumashanyarazi afunze binyuze mumuzinga wa APC.Muri icyo gihe, microcomputer imwe-chip igenzura ubunini bwikigereranyo kugirango ibone igipimo cyo kuzimya gisabwa na sisitemu.Umuzunguruko wa TEC wongewe kumuzunguruko wa 10G, uhindura cyane uburebure bwumurongo wa 10G laser.Igice cyakira gikoresha APD kugirango gihindure ibimenyetso bya optique byamenyekanye mubimenyetso byamashanyarazi, hanyuma bisohoke nyuma yo kwongera no gushiraho.Kugirango tumenye neza ko ibyiyumvo bishobora kugera ku ntera nziza, ni ngombwa gutanga umuvuduko mwinshi uhamye kuri APD ku bushyuhe butandukanye.Mudasobwa imwe-chip igera kuriyi ntego mugucunga APD yumuriro mwinshi.
2.2 Gushyira mubikorwa ibyiciro bibiri byakira
Igice cyo kwakira igice cya 10G EPON simmetrike ya OLT optique ikoresha uburyo bwo kwakira.Irakeneye kwakira ibimenyetso biturika byibiciro bibiri bitandukanye bya 1.25 na 10.3125 Gbit / s, bisaba igice cyakiriwe kugirango kibashe gutandukanya ibimenyetso bya optique byibi biciro bibiri bitandukanye kugirango tubone ibimenyetso byamashanyarazi bihamye.Gahunda ebyiri zo gushyira mubikorwa ibyiciro bibiri biturika byakira OLT optique modules birasabwa hano.
Kuberako ibyinjijwe optique ikoresha tekinoroji ya TDMA (Time Division Multiple Access) tekinoroji, igipimo kimwe gusa cyurumuri rushobora kubaho mugihe kimwe.Ikimenyetso cyo kwinjiza gishobora gutandukanywa muri optique binyuze muri 1: 2 optique itandukanya, nka Yerekanwa ku gishushanyo cya 2. Cyangwa ukoreshe gusa moteri yihuta kugirango uhindure ibimenyetso bya optique 1G na 10G mubimenyetso byamashanyarazi bidakomeye, hanyuma utandukanye amashanyarazi abiri ibimenyetso hamwe nibiciro bitandukanye binyuze mumurongo munini wa TIA, nkuko bigaragara ku gishushanyo cya 3.
Igishushanyo cya mbere cyerekanwe ku gishushanyo cya 2 kizazana igihombo runaka cyo kwinjiza mugihe urumuri runyuze muri 1: 2 optique itandukanya, igomba kongera ibimenyetso byinjira byinjira, bityo amplifier optique igashyirwa imbere ya optique.Ibimenyetso bya optique byatandukanijwe noneho bigakorerwa optique / amashanyarazi na detector yibiciro bitandukanye, hanyuma amaherezo yubwoko bubiri bwibimenyetso byamashanyarazi bihamye.Ikibazo gikomeye muri iki gisubizo ni uko hakoreshwa optifier ya optique hamwe na 1: 2 optique ya optique, kandi hakenewe ibyuma bibiri kugirango bihindure ibimenyetso bya optique, byongera umurego mubikorwa kandi byongera ikiguzi.
Muri gahunda ya kabiri yerekanwe muri FIG.3, ibimenyetso byinjiza optique bikenera gusa kunyura kuri detector na TIA kugirango bigere gutandukana mumashanyarazi.Intandaro yiki gisubizo kiri muguhitamo TIA, bisaba TIA kugira umurongo wa 1 ~ 10Gbit / s, kandi mugihe kimwe TIA ifite igisubizo cyihuse muriki cyerekezo.Gusa binyuze muri parameter ya TIA irashobora kubona igisubizo cyihuse, kwakira sensibilité birashobora kwizerwa neza.Iki gisubizo kigabanya cyane ingorane zo gushyira mubikorwa kandi kigakomeza kugenzura.Mu gishushanyo nyirizina, muri rusange duhitamo gahunda ya kabiri kugirango tugere ku byiciro bibiri biturika.
2.3 Igishushanyo cyumuzunguruko wibyuma kumpera yakira
Igishushanyo cya 4 nicyuma cyumuzunguruko cyigice cyakira igice.Iyo haribintu byaturika byinjira, APD ihindura ibimenyetso bya optique mubimenyetso byamashanyarazi bidakomeye ikayohereza muri TIA.Ikimenyetso cyongerewe na TIA mubimenyetso byamashanyarazi 10G cyangwa 1G.Ikimenyetso cyamashanyarazi 10G cyinjira muri 10G LA binyuze muburyo bwiza bwa TIA, naho ikimenyetso cyamashanyarazi 1G cyinjira muri 1G LA binyuze muburyo bubi bwa TIA.Imashini C2 na C3 zihuza capacator zikoreshwa kugirango tugere kuri 10G na 1G AC zifatanije.Uburyo bwa AC buhujwe bwatoranijwe kuko bworoshye kuruta uburyo bwa DC buhujwe.
Nyamara, guhuza AC bifite kwishyurwa no gusohora ubushobozi bwa capacitor, kandi umuvuduko wo gusubiza kubimenyetso uterwa no kwishyurwa no gusohora igihe gihoraho, ni ukuvuga ko ikimenyetso kidashobora gusubizwa mugihe.Iyi mikorere igomba gutakaza igihe runaka cyo kwakira igihe cyo gutuza, ni ngombwa rero guhitamo ingano nini ya capacitori ya AC.Niba hatoranijwe ubushobozi buke bwo guhuza, igihe cyo gutuza kirashobora kugabanywa, kandi ikimenyetso cyatanzwe na ONU muri buri mwanya gishobora kwakirwa rwose bitabangamiye ingaruka zo kwakirwa kuko igihe cyo kwakira igihe kirekire kandi nikigera cyigihe gikurikira Ikibanza.
Nyamara, ubushobozi buke cyane bizagira ingaruka kumikorere kandi bigabanye cyane guhagarara kwakirwa.Ubushobozi bunini burashobora kugabanya sisitemu ya jitter no kunoza ibyiyumvo byanyuma.Kubwibyo, kugirango uzirikane igihe cyo kwakira igihe cyo kwakira no kwiyumvisha ibintu, hakenewe guhitamo ubushobozi bwo guhuza C2 na C3.Mubyongeyeho, kugirango tumenye neza ibimenyetso byinjira byinjira mumashanyarazi, capacitori ihuza hamwe na résistor ihuza hamwe na 50Ω ihujwe na terefone mbi ya LA.
LVPECL (Umuvuduko muke mwiza wa Emitter Coupling Logic) umuzenguruko ugizwe na rezistor R4 na R5 (R6 na R7) hamwe na voltage ya 2.0 V DC ikoresheje ibimenyetso bitandukanye bitangwa na 10G (1G) LA.ikimenyetso cy'amashanyarazi.
2.4 Gutangiza igice
Igice cyohereza igice cya 10G EPON simmetrike ya OLT optique igizwe ahanini mubice bibiri bya 1.25 na 10G byohereza, ibyo bikaba byohereza ibimenyetso bifite uburebure bwa 1490 na 1577 nm kumanuka.Dufashe igice cyohereza 10G nkurugero, ibimenyetso bibiri bitandukanye bya 10G byinjira muri chip ya CDR (Isaha yo gufata Isaha), ni AC ihujwe na chip ya shoferi ya 10G, hanyuma amaherezo yinjizwa muburyo butandukanye muri laser ya 10G.Kuberako ihindagurika ryubushyuhe rizagira ingaruka zikomeye kumurambararo wa lazeri yoherejwe, kugirango uhagarike uburebure bwumurongo kugeza kurwego rusabwa na protocole (protocole isaba 1575 ~ 1580nm), imiyoboro ikora yumuzunguruko wa TEC igomba guhinduka, bityo ko ibisohoka byumurambararo bishobora kugenzurwa neza.
3. Ibisubizo by'ibizamini no gusesengura
Ibipimo nyamukuru byerekana ibipimo bya 10G EPON bihuza OLT optique ikubiyemo igihe cyo kwakira igihe cyo kwakira, kwakira ibyakiriwe, no kohereza igishushanyo cyamaso.Ibizamini byihariye nibi bikurikira:
(1) Akira igihe cyo gushiraho
Munsi yimikorere isanzwe ya uplink yaturika imbaraga za optique ya -24.0 dBm, ibimenyetso bya optique bitangwa numucyo uturika bikoreshwa nkibipimo byo gutangiriraho, kandi module yakira kandi igashyiraho ibimenyetso byamashanyarazi byuzuye nkibipimo byanyuma, birengagije igihe cyo gutinda k'umucyo muri fibre yikizamini. Ibipimo byapimwe 1G byaturikiye igihe cyo kwakira ni 76.7 ns, byujuje ubuziranenge mpuzamahanga bwa <400 ns;10G yaturika igihe cyo kwakira ni 241.8 ns, nayo yujuje ubuziranenge mpuzamahanga bwa <800 ns.
3. Ibisubizo by'ibizamini no gusesengura
Ibipimo nyamukuru byerekana ibipimo bya 10G EPON bihuza OLT optique ikubiyemo igihe cyo kwakira igihe cyo kwakira, kwakira ibyakiriwe, no kohereza igishushanyo cyamaso.Ibizamini byihariye nibi bikurikira:
(1) Akira igihe cyo gushiraho
Munsi yimikorere isanzwe ya uplink yaturika imbaraga za optique ya -24.0 dBm, ibimenyetso bya optique bitangwa numucyo uturika bikoreshwa nkibipimo byo gutangiriraho, kandi module yakira kandi igashyiraho ibimenyetso byamashanyarazi byuzuye nkibipimo byanyuma, birengagije gutinda kwumucyo muri fibre yikizamini.Ibipimo byapimwe 1G byaturika igihe cyo kwakira ni 76.7 ns, byujuje ubuziranenge mpuzamahanga bwa <400 ns;10G yaturika igihe cyo kwakira ni 241.8 ns, nayo yujuje ubuziranenge mpuzamahanga bwa <800 ns.
