Lub zom zaws yog muaj li ntawm nkag thiab tawm cov pob zeb nkag, tsom iav thiab cov khoom tawg yooj yim. Nws txoj haujlwm yog cais cov kab uas yuav tsum muaj resonance haum cov kab. Qhov tseem ceeb tivthaiv hauv lub nruab hluav taws xob yog qhov khoom siv tawg, tam sim no cov cuab yeej siv kev lag luam tau siv cov khoom zoo nkauj.
Kev siv:
Kho qhov muag splitter, tseem hu ua OBD, yog ib hom ntawm cov khoom siv passive uas txuas nrog FTTH. Nws feem ntau yog siv los ntawm cov neeg ua haujlwm hauv kev lag luam kev sib txuas lus uas xav tau nkag mus rau hauv tsev sab dav dav.
OLT hauv chav computer tau txuas nrog lub thawv xa khoom mus rau OLT lub davhlau ya nyob twg. Lub sijhawm no, muaj ob qho xwm txheej:
1. Ib theem theem hom, ib theem teeb pom kev zoo, siv chaw ua si, chaw nyob chaw, khw. Cov khoom siv kho qhov muag tau txais thiab lwm lub thawv loj txaus kom haum raws li kev sib cais ntawm cov txaws loj, thiab cov splitter hauv lub thawv tau txuas ncaj qha rau ont ntawm tus neeg siv' s lub tsev.
2. Ob theem theem hom, ib theem thiab ob theem teeb pom kev sib cais siv scene nroog. Cov no feem ntau splitter nyob rau hauv lub cell optical hlws ris lub thawv, uas yog, thawj theem splitter nyob rau hauv lub theem ob hom tuaj tawm rau theem ob splitter nyob rau hauv txoj kev hauv tsev sab thiab tom qab ntawd mus rau ont nyob rau hauv tus neeg siv sab.
Txoj hau kev npaj qauv ntawm splitter txiav txim siab cov txheej txheem configuration
1. Txhawm rau kom ntseeg tau qhov sib xws thiab ruaj khov ntawm cov khoom siv, txhua txheej txheej ntawm cov ntaub ntawv kho qhov muag (nrog rau lub ntsiab txuas optical splitter, kev txuas rov txuas qhov txuas lub tshuab txais hluav taws xob thiab rov ua txuas txuas optical splitter) yuav tsum muab sib xyaw los ntawm tib lub chaw tsim khoom;
2. Vim hais tias kev sib cais tawg yog qhov sib txuam ua tau zoo, tsis kho qhov siv tau ib zaug tsim cov cuab yeej, xav tias yuav ua kom tom ntej loj tuaj, yog tias nws tsis tau teeb tsa tag nrho, nws yuav tsum tau tsim kho tag nrho;
3. Lub amplifier yuav tsum tau teeb tsa raws li qhov ntsuas tiag tiag;
4. Txhawm rau txuag chav hauv chav thiab ua kom yooj yim rau kev ua haujlwm thiab tu tsev, cov khib nyiab yuav tsum tau muab tso rau hauv chav nyob raws li chav tsev;
5. Xav txog kev nyab xeeb thiab ruaj khov ntawm txoj kab txuas, nws yog qhov yuav tsum tau hais tias cov nquag thiab sawv kev txuas yuav tsum muab tso ntawm nws tus kheej.
Raws li qhov tseem ceeb ntawm PON system (ONU, OLT thiab passive optical faib network), lub luag haujlwm tseem ceeb ntawm kev cais tawm yog faib cov ntaub ntawv downlink thiab centralize uplink cov ntaub ntawv. Lub splitter muaj ib uplink interface thiab ntau downlink interfaces. Lub teeb liab los ntawm uplink optical interface yuav muab faib rau txhua qhov downlink optical cuam tshuam rau kev sib kis, thiab cov ntaub ntawv los ntawm downlink muaj tsuas yog uplink kis chaw nres nkoj. Tsuas yog thaum lub teeb liab optical mus ntawm uplink mus rau downlink, lub teeb liab optical zog / lub zog kho qhov muag yuav poob qis, thiab tib yam muaj tseeb thaum nws mus ntawm downlink rau uplink. Ntxiv mus, cov zis muaj zog ntawm txhua tus downlink interface tuaj yeem yog qhov qub lossis txawv. Hauv tib hom kab hluav taws xob kis, qhov sib kis ntawm lub teeb feem ntau yog nyob ntawm tus tub ntxhais, tab sis tseem muaj qee qhov hluav taws xob kis tau los ntawm cov cladding ze rau cov tub ntxhais, uas yog hais, yog tias ob lub cores ze txaus, lub teeb liab hluav taws xob tuaj yeem xa rov qab rau hauv ob daim txiag. Lub tshuab ntsuas hluav taws xob yog tso lub luag haujlwm ntawm kev xa tawm.
Optical splitter (optical splitter) yog cov khoom siv sib txuas ntawm ntau cov tswv yim thiab cov txiaj ntsig, uas tuaj yeem paub txog txoj kev sib txuas, ceg thiab faib tawm ntawm cov cim kho qhov muag nyob rau hauv kho qhov muag network. Nws yog qhov tseem ceeb tshaj ntawm cov kab hluav taws xob txuas. M × n feem ntau yog siv los qhia tias tus splitter muaj m inputs thiab N outputs. Tam sim no, cov splitters siv nyob rau hauv lub network feem ntau 1 × 2 thiab 1 × 4 splitters.
Dab tsi yog qhov teeb pom kev zoo ntawm cov splitter? Yuav ua li cas thiaj xam?
Plaub yam kev qhia tshwj xeeb ntawm kev ntsaws cov yuag yog yoj, sib nkag tsis tau, poob ntxiv thiab qhov faib ua feem cais. Qhov tseeb, qhov ntsuas tseem ceeb tshaj plaws ntawm lub tsom teeb hluav taws xob yog qhov sib txawv ntawm lub teeb hluav taws xob hauv qhov ntsuas hluav taws xob hauv qab tshwj xeeb sib cais lub teeb. Hauv cov xwm txheej ntawm qhov sib cais sib cais lub teeb, lub teeb nrig ntawm lub teeb hluav taws xob yuav tsis txawv.
Yuav ua li cas los xam lub teeb attenuation ntawm splitter?
Tus nqi kho qhov muag tsim qhov muaj nuj nqi ntawm cov splitter=kis tau txais lub zog kho qhov muag + qhov poob ntxiv + tso tsis tau + poob fiber ntau.
1. Kev ntsuas los ntawm kev faib ua feem sib cais ntawm cov splitter
Cov txheej txheem: ki=pi / SP * 100% (PI yog lub zog tsav uas yuav tsum muaj rau txhua qhov txuas txuas, SP yog qhov sib ntxiv ntawm lub zog tsav uas yuav tsum muaj rau txhua qhov txuas ntawm lub laser.)
2. Muab xam los ntawm cov poob ntxiv
Hauv cov txheej txheem ntawm kev ua haujlwm tiag tiag, tus nqi ploj ploj tuaj yeem ntsuas tau, thiab nws tsuas yog xav kuaj thiab sau tus nqi raws li qee qhov kev ua haujlwm tshwj xeeb, thiaj li ua tau txoj haujlwm zoo hauv kev faib tawm ntawm cov kev sib txawv.
Feem ntau, qhov poob ntawm 1 × n ib hom-hom nqaj splitter yog raws li hauv qab no:
Tus naj npawb ntawm cov ceg | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 16 |
Kev ploj ntxiv / dB | 0.2 | 0.3 | 0.4 | 0.45 | 0.5 | 0.55 | 0.6 | 0.7 | 0.8 | 0.8 | 1.0 | 1.2 |
3. Teeb tsis pom tseeb
Cov txheej txheem: Il=- 10lg (PO / PI) (PO yog lub zog kho qhov muag thaum tawm, PI yog lub zog kho qhov muag thaum lub tswv yim.)
4. Muab xam los ntawm cov tsis muaj fiber ntau
Hauv kev coj ua, tus nqi no tsis tas yuav raug suav thiab muaj qee cov qauv siv piv txwv. Nws yog ib qho tsim nyog yuav tsum tau hais ncaj qha rau tus lej suav lej thiab ntsuas qhov poob ploj ntawm nthwv dej sib txawv los txiav txim siab zaum kawg poob tus nqi.
Wavelength | Attenuation coefficient ntawm optical fiber (siv tus nqi) |
1310nm | 0.3 ~ 0.4dB / km |
1550nm | 0.15 ~ 0.25dB / km |
850nm | 3.75dB / km |
Dab tsi yog cov spectrometers? Yuav xaiv cov splitter li cas?
Raws li cov ntawv thov ntau yam sib txawv, lub teeb ua ke tuaj yeem muab faib ua lub thawv hom, hom tais, hom khib thiab phab ntsa mounted hom. Lub thawv hom splitter feem ntau yog siv rau optical fiber faib lub thawv, thiab lwm yam.; lub tais hom splitter feem ntau siv rau ODF optical fiber faib tus ncej thiab optical cable hlov thawv, thiab lwm yam.; qhov khib hom splitter yog ntsia tau rau hauv qhov rack txheem; cov phab ntsa mounted splitter tuaj yeem ntsia tau rau ntawm phab ntsa.
Los ntawm cov txheej txheem thev naus laus zis, muaj ob hom optical splitter: kub yaj taper thiab PLC planar waveguide. Feem ntau hais lus, 1 × 2 thiab 1 × 4 tuaj yeem siv kub yaj taper, thiab 1 × 4 thiab siab dua tau raug pom zoo kom siv PLC planar waveguide. PLC splitter adopts semiconductor thev naus laus zis, nrog zoo zoo thiab channel uniformity. PON yog thawj qhov kev xaiv rau kev tsim kho.
Hauv kev xaiv, peb yuav tsum them sai sai rau qhov ua haujlwm ntawm lub nthwv kab, sim xaiv 1260nm ~ 1650nm cov qhab puv, qee cov tuam ntxhab' tso tub ntxhais poob ua cim yuav muab faib ua cov khoom lag luam zoo dua qub thiab cov khoom lag luam txheem, yog tias lub kaw lus xav xa CATV cov teeb liab video, peb yuav tsum them nyiaj rau lub xa tuaj poob rov qab.
Raws li cov txheej txheem tsim khoom sib txawv, cov tshuab cais tawm tuaj yeem faib ua ob hom: fused taper splitter thiab planar waveguide splitter. Qhov planar waveguide splitter yog siv dav hauv FTTx thiab PON. Lub fused taper splitter yog tsim los ntawm fusing ob lossis ntau dua fiber ntau ntawm sab; lub planar waveguide splitter (PLC) yog cov khoom lag luam micro kho qhov muag, uas siv cov tshuab lithography los ua cov txheej txheem optical waveguide ntawm dielectric lossis semiconductor substrate kom paub cov ceg faib haujlwm. Lub hauv paus ntsiab lus ntawm cov cais tawm ob hom no zoo ib yam. Nkawd ob leeg paub qhov sib txawv ntawm cov nqi sib txawv los ntawm kev hloov thaj txi av uas sib txuas (cov qib txuas, txuas ntev ntev) thiab hloov cov xov hluav taws xob.
Tsis tas li ntawd, cov splitter tuaj yeem faib ua 1 × 2, 1 × 4, 1 × 8, 1 × 16, 1 × 32, 1 × 64 splitter raws li kev sib txawv ntawm kev sib cais.
Nyob rau hauv lub ntsej muag ntawm cov saum toj no ntau hom kev sib cais, yuav ua li cas xaiv? Peb muaj peev xwm xub txiav txim siab rau daim ntawv thov cov xwm txheej thiab xaiv cov txaws tsim nyog raws li qhov xav tau tiag tiag. Piv txwv li, nyob rau qhov xwm txheej uas muaj ob peb ceg thiab lub qhov muag siv yoj tsis yog qhov rhiab (qhov ntawd, tsuas yog 1 × 2 lossis 1 × 4 txaus), peb tuaj yeem xaiv qhov fused tapered splitter; nyob rau hauv qhov xwm txheej uas muaj ntau lub wavelengths (uas yog, ntau dua 1 × 4) xws li FTTH, peb tuaj yeem xaiv qhov planar waveguide (PLC) splitter, vim hais tias lub hom phiaj waveguide tsis haum （Lub teeb faib tau zoo sib xws thiab cov channel niaj hnub zoo li no.
HTF' s khoom siv kho qhov muag fiber ntau yog kho kom haum, qhov zoo tshaj yog lav, thiab cov khoom siv tau yog ntshuam.
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