Fiber Technology Optical fiber is comprised of a light carrying core surrounded by cladding. Which traps the light in the core by the principle of total internal. Use a vapour-phase oxidation technique to deposit fibre Modified chemical vapour deposition (MCVD). O2. SiCl4 Outside Vapour-Phase Deposition (OVD). Key words: vapor phase, fabrication of optical fibre preform, special optical fibres. Abstract: An .. burner flame (in outside deposition process) is hot enough.
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To form the core, vapors from both silicon tetrachloride and titanium tetrachloride are fed into the flame with oxygen, so that you form soot particles of silicon dioxide and titanium oxide Figure 2. Figure 2 Once the fine soot of silicon dioxide and titanium oxide are made, the flame is directed on a mandrel or substrate outside vapour phase oxidation collects the soot.
It's hot enough so that the soot sticks together and you end up with a porous body or soot preform, a cylindrical body on a mandrel outside vapour phase oxidation rotating rod. You consolidate it into clear glass by feeding it into a high temperature furnace Figure 3where the flame moves up and down the rod later removed while it's rotating, so you end up with a cylindrical body formed of titania titanium oxide and silica, which is the core with its higher refractive index.
When the core glass is thick enough, you turn off the titanium tetrachloride which is the source for the added oxide and just deposit the vapor from the silicon tetrachloride.
The flame keeps moving up and down the rod to make the cladding with its lower index of refraction. This is the glass preform. Outside vapour phase oxidation very first fibre had titania in outside vapour phase oxidation, but within two years we started using germanium tetrachloride to form germania germanium oxide for making the core because it was much easier to use.
Outside vapor-phase oxidation (OVPO)
Germania is still used today. The index of refraction between the core and cladding need not vary much, around 1 percent.
For example, the core glass can have an index of refraction of 1. But, this can be adjusted.
The bigger the index of refraction difference, the smaller the core has to be to make the fibre single mode. Once you have the glass preform made, you put it into a furnace outside vapour phase oxidation is hot enough to soften the glass enough to draw a fibre from Figure 4.
But you can't melt it. That is, you can't get it hot enough -- even at deg. C -- to drip because silica is a very viscous glass. Figure 4 The glass preform or blank is lowered into the top of a draw furnace where it is heated until a gob starts to fall, pulling a thin strand of glass -- the beginning of an optical fibre.
The fibre goes through a precise outside vapour phase oxidation diameter monitor, which keeps the cladding outside vapour phase oxidation fixed. Next, a plastic coating is applied and cured, using ultraviolet lamps, and the fibre is wound onto a spool.
Outside vapor-phase oxidation (OVPO) | Photonics Dictionary® |
Images courtesy of Corning, Inc. In the beginning, with the experimental ones, we could draw fibre about a kilometer or so. Today, it'd be several hundred kilometers from a preform.
How do you get the exact dimension of the core and cladding while you're drawing the fibre out? You make the preform with the correct ratio of core to cladding dimension.
Say you want to make the core one-tenth of the total diameter. When you pull the glass down, there outside vapour phase oxidation instruments that are watching the outside diameter.
If it's too big, you draw faster.
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