Fiber preform yog ib qho khoom siv hluav taws xob nrog cov ntsiab lus siab, thiab cov khoom tsis txaus hauv kev lag luam fiber ntau thiab cable. Nws yog tsuas yog siv rau kev kos duab ntawm optical fibers. Fiber preform yog cylindrical siab -purity quartz iav pas nrig. Nws cov qauv muab faib ua ob ntu. Cov tub ntxhais pas nrig hauv nruab nrab yog ua los ntawm cov khoom siv iav nrog qhov ntsuas siab dua qhov ntsuas siab, thaum lub cladding ntawm qhov chaw yog ua los ntawm cov khoom siv iav nrog qhov qis qis dua. Qhov sib txawv ntawm qhov refractive index enables qhov kev xav thiab kis ntawm optical signals.
Cov txheej txheem tsim khoom tam sim no rau preformed rods feem ntau suav nrog:
1.Vapor axial deposition (VAD), qhov twg siab -kub gaseous reactant deposits los ua ib tug iav txheej ntawm qhov kawg ntawm lub rotating pas nrig.
2.External vapor deposition (OVD), qhov twg cov deposition tshwm sim nyob rau sab nraud ntawm lub rotating pas nrig core.
3.Modified chemical vapor deposition (MCVD), qhov twg cov iav txheej tau tso rau ntawm phab ntsa sab hauv ntawm lub raj quartz thiab tom qab ntawd dhau mus siab - kub melting thiab crystallization.
4.Plasma chemical vapor deposition (PCVD), qhov twg cov iav txheej tau muab tso rau hauv cov plasma kom excite cov pa roj, haum rau siab -kev ua haujlwm fiber ntau. Lub cladding ntawm fiber ntau preform pas nrig tuaj yeem tsim tau siv cov txheej txheem loj tube (RIC), qhov twg cov tub ntxhais pas nrig tau muab tso rau hauv qhov siab -purity quartz raj thiab tom qab ntawd hauv zos rhuab kom sib xyaw ua ke tag nrho cov khoom, lossis siv OVD txoj kev los tso cov cladding ib feem ntawm sab ntawm tus pas nrig.
Cov txheej txheem no tsim cov khoom oxide los ntawm cov pa roj- cov tshuaj tiv thaiv theem thiab tso rau lawv. Tom qab sintered ntawm qhov kub thiab txias, lawv tsim pob tshab iav rods.
