Na usoro EPON, a na-ejikọta OLT na ọtụtụ ONU (nchịkọta netwọk anya) site na POS (passive optical splitter).Dị ka isi nke EPON, OLT optical modul ga-emetụta ọrụ nke usoro 10G EPON dum.
1.Mwebata 10G EPON symmetrical OLT optical modul
10G EPON symmetrical OLT optical module na-eji nnabata uplink gbawara na downlink na-aga n'ihu na-ebufe ụdịdị, nke a na-ejikarị maka ntụgharị anya / eletriki na sistemụ 10G EPON.
Akụkụ nnata nwere TIA (amplifier transimpedance), APD (Avalanche Photodiode) na 1270/1310nm, yana LA abụọ (amplifiers na-amachi) na ọnụego 1.25 na 10.3125 Gbit / s.
Ngwunye na-ebufe bụ 10G EML (laser-absorption modulation laser) na 1.25 Gbit/s DFB (laser nzaghachi ekesa), yana ogologo ikuku ikuku ya bụ 1577 na 1490nm, n'otu n'otu.
Sekit ịnya ụgbọ ala na-agụnye sekit APC dijitalụ (Automatic Optical Power Control) na sekit TEC (nkwụghachi ụgwọ ọkụ) maka idowe ogologo ikuku ikuku laser 10G kwụsiri ike.A na-emejuputa nlebanya nke nnyefe na ịnata site na otu microcomputer mgbawa dịka usoro SFF-8077iv4.5 siri dị.
N'ihi na njedebe nnata nke modul anya OLT na-eji nnabata mgbawa, oge nhazi nnabata dị mkpa karịsịa.Ọ bụrụ na oge nhazi nnabata ahụ dị ogologo, ọ ga-emetụta mmetụta uche nke ukwuu, ma nwedịrị ike ime ka nnabata mgbawa ahụ ghara ịrụ ọrụ nke ọma.Dị ka ihe chọrọ nke IEEE 802.3av protocol, oge nguzobe nke 1.25Gbit / s mgbawa nnabata ga-abụ <400 ns, na mgbawa nnabata uche ga-abụ <-29.78 dBm na a bit njehie ọnụego nke 10-12;na 10.3125 Gbit/s Oge ntọlite n'ikuku mgbawa ga-abụrịrị <800ns, na mmetụta nnabata nke mgbawa ga-abụrịrị <-28.0 dBm nwere ntakịrị mperi nke 10-3.
2.10G EPON symmetrical OLT ngwa anya modul imewe
2.1 Atụmatụ imewe
Ihe 10G EPON symmetrical OLT optical module bụ nke triplexer (modul ụzọ atọ nwere otu eriri), na-ebufe, ịnata, na nleba anya.Triplexer gụnyere lasers abụọ na onye nchọpụta.A na-ejikọta ọkụ na-ebufe na ọkụ natara n'ime ngwa anya site na WDM (Wavelength Division Multiplexer) iji nweta otu-fiber bidirectional nnyefe.E gosipụtara nhazi ya na eserese 1.
Akụkụ na-ebufe nwere lasers abụọ, onye isi ọrụ ya bụ ịtụgharị 1G na 10G mgbaàmà eletrik n'ime akara ngosi anya, n'otu n'otu, na ịnọgide na-enwe ike nkwụsi ike n'ime oghere mechiri emechi site na sekit APC dijitalụ.N'otu oge ahụ, microcomputer nke otu mgbawa na-achịkwa ịdị ukwuu nke modulation ugbu a iji nweta oke mkpochapụ nke usoro ahụ chọrọ.A na-agbakwunye sekit TEC na sekit na-ebufe 10G, nke na-eme ka ọ dịkwuo ogologo oge mmepụta nke laser 10G.Akụkụ nnata na-eji APD gbanwee mgbama mgbawa achọpụtara achọpụtara ka ọ bụrụ mgbama eletriki, wee wepụta ya mgbe nkwalite na ịkpụzi ya.Iji hụ na mmetụta uche nwere ike iru oke dị mma, ọ dị mkpa ịnye nrụgide dị elu na APD na okpomọkụ dị iche iche.Kọmputa otu mgbawa na-enweta ihe mgbaru ọsọ a site n'ịchịkwa sekit voltaji dị elu APD.
2.2 Mmejuputa n'ikuku nbipu nke ọnụọgụ abụọ
Akụkụ nnata nke 10G EPON symmetric OLT optical module na-eji usoro nnabata mgbawa.Ọ kwesịrị ịnata akara mgbawa nke ọnụego abụọ dị iche iche nke 1.25 na 10.3125 Gbit / s, nke chọrọ akụkụ nnata ka ọ nwee ike ịmata ọdịiche dị na akara ngosi nke ọnụego abụọ a dị iche iche nke ọma iji nweta akara ngosi eletrik kwụsiri ike.Atụmatụ abụọ maka mmejuputa nnabata ọnụọgụ ọnụọgụ abụọ nke modul anya OLT ka atụpụtara ebe a.
N'ihi na mgbama ngwa ngwa ntinye na-eji teknụzụ TDMA (Time Division Multiple Access), ọ bụ naanị otu ọnụego mgbawa nwere ike ịdị n'otu oge.Enwere ike kewapụ akara ntinye aka na mpaghara anya site na 1: 2 optical splitter, dị ka egosiri na eserese 2. Ma ọ bụ jiri naanị onye na-achọpụta ngwa ngwa gbanwee 1G na 10G ngwa anya n'ime akara ọkụ eletrik na-adịghị ike, wee kewaa eletrik abụọ. akara nwere ọnụego dị iche iche site na TIA bandwit buru ibu, dịka egosiri na eserese 3.
Atụmatụ mbụ e gosipụtara na eserese 2 ga-eweta ụfọdụ nkwụsị ntinye mgbe ọkụ na-agafe na 1: 2 optical splitter, nke ga-eme ka mgbama ntinye anya dị elu, ya mere a na-etinye ihe nrịbama anya n'ihu onye na-ese ihe anya.A na-edobe akara ngosi anya dị iche iche na ntụgharị anya / eletriki site n'aka ndị na-achọpụta ọnụego dị iche iche, n'ikpeazụkwa, a na-enweta ụdị mgbama ọkụ eletrik abụọ kwụsiri ike.Ihe kachasị njọ nke ngwọta a bụ na a na-eji ihe nrịbama anya na 1: 2 optical splitter, na ihe nchọpụta abụọ dị mkpa iji gbanwee akara ngosi anya, nke na-eme ka mgbagwoju anya nke mmejuputa na-abawanye ọnụ.
Na atụmatụ nke abụọ egosiri na FIG.3, akara ngosi anya ntinye naanị kwesịrị ịgafe na onye nchọpụta na TIA iji nweta nkewa na ngalaba eletrik.Isi ihe ngwọta a dị na nhọrọ TIA, nke chọrọ TIA ka ọ nwee bandwit nke 1 ~ 10Gbit / s, ma n'otu oge TIA nwere nzaghachi ngwa ngwa n'ime bandwit a.Naanị site na oke TIA dị ugbu a nwere ike nweta uru nzaghachi ngwa ngwa, nnabata nnabata nwere ike kwenye nke ọma.Ngwọta a na-ebelata oke mgbagwoju anya nke mmejuputa ma na-echekwa ụgwọ ọrụ.N'ime nhazi ahụ, anyị na-ahọrọ atụmatụ nke abụọ iji nweta nnabata ọnụọgụ ọnụọgụ abụọ.
2.3 Nhazi nke sekit ngwaike na njedebe nnata
Fig. 4 bụ ngwaike sekit nke mgbawa na-anata akụkụ.Mgbe enwere ntinye anya gbawara agbawa, APD na-atụgharị mgbama ngwa anya ka ọ bụrụ mgbama eletrik na-adịghị ike wee ziga ya na TIA.TIA na-emewanye mgbama a ka ọ bụrụ akara ọkụ eletrik 10G ma ọ bụ 1G.Ihe mgbaàmà eletrik 10G bụ ntinye aka na 10G LA site na njikọ dị mma nke TIA, na 1G eletrik na-abanye na 1G LA site na njikọ na-adịghị mma nke TIA.Capacitors C2 na C3 bụ ndị na-arụkọ ọrụ ọnụ iji nweta mmepụta 10G na 1G AC.Ahọpụtara usoro ejikọtara AC n'ihi na ọ dị mfe karịa usoro ejikọtara DC.
Otú ọ dị, njikọ AC nwere ụgwọ na nkwụsị nke capacitor, na ọsọ nzaghachi na mgbama na-emetụta ụgwọ na oge nkwụsịtụ, ya bụ, enweghị ike ịza mgbaàmà n'oge.Njirimara a ga-efunahụ ụfọdụ oge nhazi oge nnabata, yabụ ọ dị mkpa ịhọrọ oke ikike njikọta AC.Ọ bụrụ na ahọpụtara capacitor obere njikọ, enwere ike ime ka oge nhazi ahụ dị mkpụmkpụ, yana akara ngosi nke ONU na-ebufe na oghere oge ọ bụla nwere ike ịnata kpamkpam na-emetụtaghị mmetụta nnabata n'ihi na oge nhazi oge nnabata dị ogologo na mbata nke oge ọzọ. oghere.
Agbanyeghị, obere ikike ga-emetụta mmetụta njikọta ma belata nkwụsi ike nke nnabata.Nnukwu ikike nwere ike ibelata sistemu jitter ma melite nghọta nke njedebe nnata.Ya mere, iji buru n'uche oge nhazi oge nnabata na nnabata nnabata, ọ dị mkpa ka ahọpụtara capacitors C2 na C3 kwesịrị ekwesị.Tụkwasị na nke ahụ, iji hụ na nkwụsi ike nke mgbaàmà eletriki ntinye aka, onye na-ejikọta capacitor na ihe mgbochi na-eguzogide 50Ω na-ejikọta ya na njedebe ọjọọ nke LA.
LVPECL (Low Voltage Positive Emitter Coupling Logic) sekit mejupụtara resistors R4 na R5 (R6 na R7) na 2.0 V DC voltaji isi iyi site dị iche iche mgbaama mmepụta site 10G (1G) LA.mgbama ọkụ eletrik.
2.4 ngalaba mmalite
A na-ekewa akụkụ mgbasa ozi nke 10G EPON symmetric OLT modul anya ụzọ abụọ nke 1.25 na 10G na-ebufe, nke na-ezigara akara na ogologo ogologo nke 1490 na 1577 nm na downlink.Na-ewere akụkụ na-ebufe 10G dị ka ihe atụ, otu ụzọ akara ngosi dị iche iche nke 10G na-abanye na mgbawa CDR (Clock Shaping), AC jikọtara ya na mgbawa ọkwọ ụgbọ ala 10G, n'ikpeazụ na-abanye n'ụzọ dị iche na laser 10G.N'ihi na mgbanwe ọnọdụ okpomọkụ ga-enwe mmetụta dị ukwuu na laser emission wavelength, iji mee ka ogologo ikuku dị elu na ọkwa nke usoro chọrọ (protocol chọrọ 1575 ~ 1580nm), arụ ọrụ ugbu a nke TEC sekit kwesịrị ịgbanwe, ya mere. na ogologo waveleng nke mmepụta nwere ike ịchịkwa nke ọma.
3. Nnwale ule na nyocha
Ihe ngosi nnwale bụ isi nke 10G EPON symmetric OLT optical module gụnyere oge ntọlite nnata, ikike nnabata, na ịnye eserese anya.Nnwale ndị a kapịrị ọnụ bụ ndị a:
(1) Nweta oge nhazi
N'okpuru ọnọdụ ọrụ nkịtị nke uplink gbawara ngwa anya ike nke -24.0 dBm, a na-eji mgbama ngwa anya sitere na isi iyi mgbawa dị ka ebe mmalite nha, na modul na-enweta ma guzobe akara ọkụ eletrik zuru oke dị ka ebe njedebe nha, na-eleghara ya anya. oge igbu oge nke ìhè na eriri ule. A tụrụ 1G gbawara n'ikuku n'ikuku nhazi oge bụ 76.7 ns, nke na-ezute ụkpụrụ mba ụwa nke <400 ns;oge nhazi nnabata nke 10G bụ 241.8 ns, nke na-emezukwa ụkpụrụ mba ụwa nke <800 ns.
3. Nnwale ule na nyocha
Ihe ngosi nnwale bụ isi nke 10G EPON symmetric OLT optical module gụnyere oge ntọlite nnata, ikike nnabata, na ịnye eserese anya.Nnwale ndị a kapịrị ọnụ bụ ndị a:
(1) Nweta oge nhazi
N'okpuru ọnọdụ ọrụ nkịtị nke uplink gbawara ngwa anya ike nke -24.0 dBm, a na-eji mgbama ngwa anya sitere na isi iyi mgbawa dị ka ebe mmalite nha, na modul na-enweta ma guzobe akara ọkụ eletrik zuru oke dị ka ebe njedebe nha, na-eleghara ya anya. oge igbu oge nke ìhè na eriri ule.Oge nhazi nnabata nke 1G tụrụ atụ bụ 76.7 ns, nke dabara n'ụkpụrụ mba ụwa nke <400 ns;oge nhazi nnabata nke 10G bụ 241.8 ns, nke na-emezukwa ụkpụrụ mba ụwa nke <800 ns.
