1. Kev faib tawm ntawmFiberAtus mplifiers
Muaj peb lub ntsiab ntawm qhov kho tau zoo tshaj plaws:
(1 )14 semiconductor kho qhov muag tshaj plaws (soa, semiconductor kho qhov muag tshaj);
(2) Lub ntiaj teb fiber ntau ua doped nrog lub ntiaj teb tsis tshua muaj zog (thulium tm, etpium t, etpium-dopium-doped fiberforers (Edfa), raws li cov thulium-doped fiber ntau nrov dua (TDFA) thiab preaseymium-doped fiber ntau tshaj plaws (PDFA), thiab lwm yam.
(3) Cov nonlinear fiber ntau tshaj plaws, feem ntau yog Fiber Raman Amplifiers (Fiber Raman amplifier). Lub ntsiab ua tau zoo sib piv ntawm cov kev siv kho tshiab yog qhia hauv lub rooj
Edfa (erbium doped fiber ntau tshaj)
Ntau-qib laser system tuaj yeem tsim los ntawm doping lub quartz fiber nrog lub ntiaj teb tsis tshua muaj zog (xws li nd, etc.), thiab cov teeb liab teeb liab lub teeb ncaj qha. Tom qab muab cov lus tawm tswv yim uas tsim nyog, muaj fiber ntau laser yog tsim. Cov wavelength ua hauj lwm ntawm nd-doped fiber ntau tshaj plaws yog 1060NM thiab nws txoj kev loj hlob thiab kev tsim kho tau zoo tshaj Optic kev sib txuas lus thiab lwm yam laj thawj. Kev ua haujlwm wavelengths ntawm edfa thiab PDFA yog feem nyob rau hauv lub qhov rais ntawm qis dua poob (1300nm) thiab xoom tsim nyog rau kev sib txuas lus fiber ntau, uas yog qhov tsim nyog rau cov kev sib txuas lus fiber ntau. Tshwj xeeb tshaj yog Edfa, txoj kev loj hlob sai, tau ua tiav.
TusPRinciple ntawm Edfa
Cov qauv yooj yim ntawm Edfa tau qhia hauv daim duab 1 (a) Teeb teeb thiab tso kua mis tuaj yeem profagate nyob rau hauv tib qho kev coj (codirectional tso tseg), rov qab tso (thim cov lus qhia) hauv erbium fiber. Thaum lub teeb pom kev zoo thiab lub twj tso kua mis tau txhaj rau hauv lub teeb pom kev zoo nyob rau hauv qhov teeb meem ntawm lub teeb pom kev, nws rov qab ua rau lub teeb ci ntsa iab hauv qab lub teeb pom kev zoo, yog li ntawd lub teeb liab tau nthuav dav. Daim duab 1 (c) yog nws qhov tshwm sim tau tshwm sim (ase) spectrum nrog lub bandwidth loj (txog 20-40nm) thiab ob lub ncov sib npaug rau 1530nm thiab 1550nm feem.
Lub ntsiab zoo ntawm Edfa muaj kev loj, loj bandwidth, siab tso kua dej, tsawg txoj kev poob, thiab tsis muaj kev poob siab rau lub xeev polarization.
2. Cov teeb meem nrog fiber ntau tshaj plaws
Txawm hais tias kho qhov muag tshiab (tshwj xeeb yog Edfa) muaj ntau yam zoo heev, nws tsis yog lub zoo tshaj plaws. Ntxiv nrog rau lub suab nrov ntxiv uas txo tus SNR ntawm lub teeb liab, muaj qee yam lwm yam shortcomings, xws li:
- tsis sib xws ntawm cov spectrum nce nyob rau hauv lub amplifier bandwidth cuam tshuam rau ntau-channel amplification kev ua tau zoo;
- Thaum kho qhov muag yog cascaded, qhov cuam tshuam ntawm cov suab nrov ase, fiber ntau dispersion thiab cov kev mob fiber ntau thiab tsis muaj txiaj ntsig yuav ua tau.
Cov teeb meem no yuav tsum raug txiav txim siab nyob rau hauv daim ntawv thov thiab cov qauv tsim.
3. Daim ntawv thov ntawm Optical Amplifier hauv Optical Fiber Kev Sib Txuas Lus
Hauv kev sib txuas lus fiber ntau zog, covFiber ntau yam ua kom nrov duaYuav siv tau tsis tsuas yog lub zog hluav taws xob txhawb nqa cov khoom siv hluav taws xob, thiab tseem tuaj yeem hloov kho kho qhov muag hluav taws xob, txuas ntxiv rau cov kev sib kis hluav taws xob ua kom deb thiab paub qhov kev sib txuas lus zoo.
Hauv kev sib txuas lus siv kho qhov muag fiber ntau, cov ntsiab lus tseem ceeb txwv qhov chaw sib kis yog qhov ploj thiab dispersion ntawm cov kho fiber ntau. Siv lub teeb ci me me-spectrum lub teeb ci, lossis ua haujlwm ze ntawm xoom-dispersion waverength, tus cawv ntawm fiber discersion yog me me. Lub kaw lus no tsis tas yuav ua kom tiav cov teeb liab kev tsim dua tshiab (3R relay) ntawm txhua qhov chaw nres tsheb. Nws yog txaus kom ua kom nrov rau lub teeb liab kho qhov muag nrog lub suab nrov kho qhov muag (1r relay). Kev siv kho qhov muag tau siv tsis tau siv tsis tsuas yog nyob hauv cov tshuab hluav taws xob ntev tab sis kuj nyob rau hauv cov tshuab wdm, tshwj xeeb tshaj yog ua kom ua kom muaj ntau txoj kab ib txhij.
1) Daim Ntawv Thov Kev Kho Kho Kom Zoo Tshaj Plaws Hauv Lub Cev Kev Sib Txuas Lus Fiber Fiber Fiber Ntau Ntxiv
Daim duab 2 yog cov qauv schematic ntawm daim ntawv thov ntawm kho qhov muag tshaj plaws hauv lub pob tw kho fiber kev sib txuas lus muaj fiber kev sib txuas lus. (a) Daim duab no qhia tau tias lub zog hluav taws xob tau siv los ua lub zog ua rau lub zog thiab cov powerplifier ntawm tus tau txais kom cov neeg tsis muaj zog yog ob npaug. Piv txwv li, tau txais Edfa, lub system kis Qhov deb ntawm 1.8GB / s nce ntxiv los ntawm 120km rau 250km lossis txawm mus txog 400km. Daim duab 2 (b) - (d) yog daim ntawv thov kho qhov muag tshaj plaws hauv ntau cov xov hluav taws xob; Daim duab (B) yog cov tsoos 3R relay hom; Daim duab (c) yog cov sib xyaw ua ke hom ntawm cov neeg kwv yees thiab cov refore devenifiers siv kho qhov muag; Daim duab 2 (d) Nws yog tag nrho-optical relay; Hauv txhua qhov kev sib txuas lus tag nrho-kho qhov muag, nws tsis suav nrog lub sijhawm thiab kev ua kom rov qab ua haujlwm, yog li nws yog lub raj mis mos me ntsis, thiab tsis muaj lub raj mis hluav taws xob ". Ntev npaum li kev xa thiab tau txais cov khoom siv ntawm ob xaus yog hloov, nws yog qhov yooj yim los hloov kho tus nqi qis, thiab kho qhov muag amplifier tsis tas yuav hloov.
2) Daim ntawv thov ntawm Optical Amplifier hauv Optical Fiber Ntau Faib Network
Lub zog hluav taws xob ua rau pom zoo ntawm kho qhov muag tshiab (tshwj xeeb yog edfa) muaj txiaj ntsig zoo hauv kev nthuav dav dav dav network (xws liMivvNetworks). Cov tsoos CATV network tau txais coaxial cable, uas yuav tsum tau ua kom muaj txiaj ntsig txhua ob peb puas cov kev pabcuam hluav taws xob, thiab cov kev pabcuam vojvoog ntawm lub network yog hais txog 7km. Lub ntsuas hluav taws xob kho qhov muag siv lub network siv tsis tau tsuas yog nce cov neeg siv xov tooj hluav taws xob, tab sis kuj nthuav kev sib koom tes hauv kev sib koom tes. Cov kev tsim tawm tsis ntev los no tau pom tias kev faib tawm ntawm cov khoom siv kho kho tshiab fiber ntau / hfc) kos lub zog ntawm ob qho tib si thiab muaj kev sib tw muaj zog.
Daim duab 4 yog ib qho piv txwv ntawm kev faib tawm optical fiber ntau network rau AM-vsb kev hloov kho ntawm 35 channel ntawm TV. Lub teeb ci ntawm lub teeb ntawm lub transmitter yog DFB-LD nrog nthwv dej ntawm 1550nm thiab tso zis zog ntawm 3.3DBM. Siv qib 4-theem raws li lub zog faib hluav taws xob, nws lub zog tawm tswv yim yog txog -6dbm, thiab nws lub zog tso zis yog li ntawm 13db. Kho qhov muag tau kho qhov muag pom zoo -9.2d BM. Tom qab 4 qib faib tawm, tag nrho cov neeg siv tau tau mus txog 42 lab, thiab txoj kev sib tw network yog ntau tshaj kaum tawm mais. Qhov hnyav ntawm lub teeb liab-rau-suab nrov sib piv ntawm kev sim yog ntau dua 45dB, thiab Edfa tsis ua rau txo qis hauv CSO.
Lub Sijhawm Post: Apr-23-2023