개량 CVD법에 의한 광섬유 프리폼 제조
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개요
Optical fiber preforms are manufactured by depositing ultra-pure silica glass layers inside a rotating tube using modified chemical vapor deposition (MCVD) or outside vapor deposition (OVD). The preform, a solid glass rod with precisely controlled refractive index profile, is then drawn into fiber at 2,000 degrees C. A single 1-meter preform yields 300+ km of optical fiber. The glass must be extraordinarily pure — impurity levels below parts per billion — to achieve transmission losses under 0.2 dB/km at 1,550 nm wavelength.
화학 공정
In MCVD, SiCl₄ and GeCl₄ vapors mixed with O₂ are flowed through a rotating silica tube while an external oxy-hydrogen torch traverses the length. The precursors oxidize at 1,800 degrees C to form SiO₂-GeO₂ soot that sinters into glass layers on the inner wall. After 40-60 passes, the tube is collapsed into a solid preform rod by heating to 2,100 degrees C. The preform is drawn into 125-micron fiber at 2,000 degrees C in a draw tower.
GeCl₄ + O₂ → GeO₂ + 2Cl₂
SiO₂-GeO₂ soot →[sintering] Glass (vitrification)
원자재
-
Silicon tetrachloride (SiCl₄) — Chlorination of silicon (Silica precursor (ultra-pure))
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Germanium tetrachloride (GeCl₄) — Chlorination of germanium (Refractive index dopant for core)
-
Oxygen (O₂) — Air separation (Oxidant for glass formation)
최종 제품
-
Optical fiber preform — Drawn into single-mode and multimode optical fiber (1 preform yields 300+ km of fiber)
-
Optical fiber (drawn product) — Telecommunications, internet backbone, sensors (125 micron diameter, <0.2 dB/km loss)
Environmental Impact
Chlorine gas is generated as a byproduct and must be scrubbed or recycled. SiCl₄ and GeCl₄ are corrosive and react violently with water. However, the extremely low mass of fiber produced per km means the per-unit environmental impact is modest. Optical fiber displaces copper cable, saving significant copper mining.
안전 고려사항
- ⚠ SiCl₄ and GeCl₄ react violently with water, releasing HCl
- ⚠ Chlorine gas byproduct is toxic
- ⚠ Oxy-hydrogen torches at 2,000+ degrees C
- ⚠ Fiber drawing involves fragile glass at high speed — laceration risk
최근 혁신
Hollow-core photonic crystal fiber (HCPCF) transmits light through air rather than glass, potentially reducing latency by 30%.
Multi-core and few-mode fibers multiply capacity per fiber strand.
Fluorine-doped cladding replaces germanium-doped cores in some designs to reduce costs.
생산 규모
50000
톤/년
$8 billion
시장 가치
더 보기: Electronics & Semiconductors
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