Outside vapor deposition

Fig. 21. Schematic illustration of the four primary vapor-phase deposition processes used in optical-fiber fabrication outside vapor deposition (OVD), modified chemical vapor deposition (MCVD), plasma vapor deposition (PVD), and vapor axial deposition (VAD) (115).

Outside vapor deposition (OVD), in fiber optic fabrication, 11 140, 141 Outsourcing, of maintenance, 15 478 Ovalbumin, properties of standard, 3 836t Overaged precipitation, 13 502 Overall gas-phase height of a transfer unit (Hog), packed column absorbers, 1 52... 

Methyl trichlorosilane Multi-walled carbon nanotube Nuclear magnetic resonance Outside vapor deposition Poiyacryionitrile... 

There are many potential variations in the processes used to manufacture optical fiber, but the basic premise remains essentially the same for each. This section will introduce the basics of fiber manufacturing and briefly discuss the three primary methods currently employed to support the economical production of optical fiber on a large scale. They are outside vapor deposition (OVD), vapor axial deposition (VAD), and inside vapor deposition (IVD). 

The outside vapor deposition (OVD) process uses a glass mandrel or seed rod placed in a lathe. The feed materials are delivered to the region near the rod surface by a gas-burner type assembly. The burner assembly traverses longitudinally alongside the bait rod as the lathe turns it to build-up the soot thickness... 

This outside process is sometimes referred to as OVD (outside vapor deposition). This is somewhat a misnomer, because the glass is not deposited directly from the vapor phase, but rather by the progressive aggregation of submicroscopic particles that were themselves created from the vapor phase. The process has also been called radial flame hydrolysis (RFH). 

FIGURE 7.10 Outside vapor deposition (OVD) fiber fabrication technique. 

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