Optical Transceiver Tsim Rau TDM PONs
Tus khoos phis tawm hluav taws xob (lub tshuab txais thiab txais) siv rau kev hloov kho qhov muag-rau-hluav taws xob yog ib qho tseem ceeb hauv kev sib txuas lus kho qhov muag. Hauv cov PON system, lub tshuab xa hluav taws xob thiab cov txais ntawm qhov kho qhov muag kab davhlau ya nyob twg (OLT) lossis cov khoom siv kho qhov muag (ONUs) feem ntau tau ntim ua ke los ua qhov sib tw ua kom muaj qhov kev sib tw (bidirectional optical subassembly (BOSA)).
Daim duab hauv qab no qhia txog architecture ntawm optical transceiver rau ib qho OLT thiab ONUs. Cov khoom xa tawm hluav taws xob subassembly (TOSA) muaj lub tshuab hluav taws xob (semiconductor laser) (Fabry-Perot laser lossis DFB laser) thiab cov tsav tsheb laser. Lub tshuab txais txais optical subassembly (ROSA) suav nrog photodiode (PIN lossis APD), transimpedance amplifier, qhov txwv tsis pub tshaj tawm, thiab lub moos thiab cov ntaub ntawv rov qab. Ntxiv nrog rau TOSA thiab ROSA, lub duplex lossis tripex (WDM lim) yog siv los cais cov dej sab hauv thiab sab saud wavelengths. Lub duplex lossis triplex feem ntau yog lim-zaj duab xis lim, tab sis cov ntxaij lim dej kho qhov muag (piv txwv li, Bragg grating lossis Mach-Zehnder interferometer) raws li cov phiaj xwm teeb hluav taws xob hluav taws xob tau dhau los ua qhov kev xaiv zoo dua, raws li cov phiaj hluav taws xob lub teeb hluav taws xob muaj ntau dua, ntau txhim khu kev qha, thiab yooj yim kom dhos nrog TOSA thiab ROSA. Raws li TDM PONs raug xa mus rau ntawm qhov loj, qhov kev sib zog tseem ceeb tau muab tso rau hauv kev tsim cov khoom siv kho qhov muag nrog kev ua kom zoo dua qub, txo tus nqi, thiab kev ntseeg tau zoo dua. Cov teeb meem tseem ceeb hauv kev tsim cov khoom siv kho qhov muag rau FTTx daim ntawv thov yog qib siab ntawm kev sib koom ua ke, kev siv nyiaj ntim khoom, thiab tawg ntho hom kho qhov muag xa hluav taws xob hauv kev sib txuas. Rau kev sib koom ua ke thiab ntim, kho qhov muag hloov pauv tau hloov zuj zus mus rau plannar lub teeb yoj ncig thiab cov monolithic photonic integrated circuits.
Tawg tawg-hom kho qhov muag kis tau
Hauv TDM PON system, tag nrho cov neeg siv koom ua ke cov khoom siv fiber ntau los ntawm OLT mus rau ntawm qhov chaw faib khoom. Hauv qhov kev coj downsream, cov ntaub ntawv xa tawm yog tshaj tawm rau txhua ONUs. OLT transmitters thiab ONU cov neeg tau txais kev ua haujlwm nyob rau hauv hom tsis tu ncua, qhov twg synchronization yog tswj xyuas txhua lub sijhawm. Txawm hais tias tsis muaj cov ntaub ntawv xa mus rau ONUs, OLT transmitter yuav tsum tau xa cov qauv qis me ntsis kom ONUs cov neeg txais yuav tuaj yeem rov qab lub moos tsis tu ncua los ntawm lub teeb liab nqes los. Txawm li cas los xij, nyob rau hauv cov kev taw qhia los ntawm sab saum toj, txhua tus neeg siv yuav tsum raug zam nyob rau hauv lub tshuab xa hluav taws xob, yog li thaum lub sijhawm twg los xij, tsuas muaj ib pob ntawv (los ntawm ib lub ONU) raug tso cai kom mus txog hauv lub chaw haujlwm nruab nrab. OLT tswj xyuas kev xa cov hluav taws xob sib txuas thiab lub sijhawm xa cov khoom sib kis rau txhua ONU. Thaum ONU xav xa cov ntaub ntawv xa mus rau OLT, nws xa cov khoom tawg ntawm cov ntaub ntawv hauv lub sijhawm tau teev tseg los ntawm OLT thiab tom qab ntawd tua nws lub tshuab xa tawm tag nrho kom tsis txhob cuam tshuam nrog lwm ONUs 'kev xa xov hluav taws xob. Kev tawg ntawm cov ntaub ntawv los ntawm cov sib txawv ONUs tom qab sib rau cov tau txais ntawm lub hauv paus chaw haujlwm tau sib cais los ntawm lub sijhawm ceev xwm. Hom kev sib kis no hu ua kev sib kis-sib kis.
Ntawm no yog ib daim duab uas piv rau cov ntaub ntawv cov qauv ntawm kev nruam mus ntxiv- thiab tawg-kis kev sib kis. Qhov tawg ntho-pob khoom sib kis ntawm txhua ONU thiab qhov tawg-tawg txais ntawm lub chaw haujlwm nruab nrab yog qhov tseem ceeb. Cov chaw tawg tawg-neeg txais ntawm lub rhe central office yuav tsum muaj ntau qhov kev tawm tswv yim pheej yig thiab lub sijhawm khawm ceev nrawm. Ntawm qhov tod tes, qhov tawg ntho-hom qhov xa tawm, nyob ntawm tus neeg siv sab, yuav tsum tau qhia lub sijhawm nrawm nrawm dua nrog lub zog hluav taws xob zoo thaum lub xeev tsis nyob. Kev tsim cov kev kub ceev tawg-hom optical transceiver yog qhov tsim nyog thiab muaj kev sib tw thaum siv cov phiaj xwm optical passive.
Qhov tawg ntho-hom Laser tsav
Qhov chaw tawg ntho-kis tau tus kheej muaj qhov qhia nrawm nrawm dua li lub zog zoo. Tus qauv tsim kev sib tw rau kev tawg ntho-hom laser / modulator cov tsav tsheb tau nce thiab poob lub sijhawm thiab tsis siv neeg lub zog tswj. Cov pa hluav taws xob tsav tau tsim los tswj cov hluav taws xob tsis tu ncua tam sim no thiab qhov ntsuas hluav taws xob. Txawm li cas los xij, zoo kho qhov muag fais fab tuag hauv lub xeev tsis tseem ceeb yuav tsum tau hais tias kev ntxeev siab yuav tsum tau tua sai. Cov tsav tsheb sib koom ua ke yuav tsum tau tsim los kom muaj luv luv tig / kaw ntawm kev ua haujlwm. Rau tsis siv neeg lub zog tswj, cov kab hluav taws xob feem ntau siv cov ntsuas qeeb qeeb photodiode thiab / lossis cov ntxaij lim dej analog kom nruab nrab cov teeb liab thiab ib qho kev sib txuas ib lub voj mus rau cov tswj cov voj. Nws yog ib qho tsim nyog los soj ntsuam cov khoom tsim kho qhov muag tau ntawm cov ntsiab lus tsim nyog hauv tawg ntab.
Cov Tawg tawg ntho-Cov Neeg Txais Txais
Cov khoom siv hluav taws xob tsis zoo tuaj yeem siv rau qhov nrhiav kom tawg-vim tias lawv tsis tuaj yeem nqa tau ntau pob ntawv tuaj txog uas muaj qhov sib txawv loj hauv lub zog kho qhov muag thiab cov theem ua ke. Yog li nws tsim nyog yuav tsum tau tsim cov khoom txais uas tuaj yeem hloov mus rau qhov sib txawv hauv lub zog kho qhov muag thiab ntu kev teeb tsa ntawm pob ntawv los ntawm pob ntawv. Tus qauv tsim kev sib tw rau cov khoom tawg-nrawm yog cov kev hloov rov qab zoo, theem rov qab, thiab ceev moos rov qab.
Thaum tawg tawg tsis muaj zog raws li qhov muaj zog tawg lawm, nws yog qhov nyuaj los tshawb pom lub teeb liab tsis muaj zog. Dynamic rhiab heev rov qab yog qhov tsim nyog rau kev kuaj pom ntawm lub teeb liab tsis muaj zog. Qhov rov qab ntawm cov tawg tsis muaj zog yog txwv los ntawm photodiode cov cab kuj thauj cov teebmeem, amplifier slew thiab kev them tus nqi, thiab kev cia siab tsis siv neeg nce tswj kev cuam tshuam.
Txog rau qib rov qab, lub foob pob tawg tuaj yeem tsim nrog cov lus tawm tswv yim lossis qauv qauv. Rau qhov kev tawm tswv yim tsim, qhov kev tawm tswv yim sib txawv / tso tawm transimpedance amplifier thiab cov khoom siv hluav taws xob tiv thaiv hluav taws xob tshaj tawm cov kev tawm tswv yim, qhov ntawm qhov kev tawm tswv yim, qhov teeb liab los ntawm preamplifier yog feedforward rau hauv lub ncov nrhiav qhov hluav taws xob. Ob qho kev tsim qauv tau ua tiav hauv kev coj ua. Tus qauv tawm tswv yim ua rau cov txais tau ua haujlwm kom zoo dua qub, tab sis kev sib txawv ntawm cov lus qhia / tso tawm ua ntej tsim nyog. Cov cuab yeej xa khoom noj kom tau txais cov lus teb sai dua thiab cov khoom siv sib xyaw ua ntej siv tau, tab sis cov khoom siv hluav taws xob yuav tsum tau tsim qauv kom zoo los tiv thaiv kev ua kom lub cev tawg hauv qhov ntsuas. Qib rov qab cov voj voos nrog kev tsim qauv yooj yim thiab ruaj khov thiab kev ua haujlwm zoo tseem yog qhov teeb meem qhib uas xav tau kev tshawb xyuas ntxiv.
FOCC yog ib qho chaw tsim tshuaj paus ua hluav taws xob OEM transceiver modules. Peb muab cov transceiver kho qhov muag tsis zoo xwb rau TDM PONs, peb kuj muab cov khoom siv sib txuam transceiver thoob ntiaj teb. Txais tos kom tuaj saib peb lub vev xaib uas koj tuaj yeem nrhiav cov modules uas koj xav tau yuav. Peb cov kho qhov muag tau tuaj yeem tsim kho tau nrog txhua hom, xws li SFP modules: GLC-LH-SM Cisco , HP J4858A , JX-SFP-1FE-FX (Juniper sib xws), thiab lwm yam.
