Chapter 3: Preform manufacture and fiber drawing

1
Chapter 3 Preform manufacture and fiber drawing
Production of silica glass through deposition
Melting of ultrapure glass with
furnace heated by radio frequency (RF) induction.
2
Flowchart of the production of ultrapure silicon
dioxide from natural quartz or quartz mineral
sands.
3
Deposition of silicon dioxide at high
temperature in an ultrapure quartz tube in the
MCVD (Modified Chemical Vapor Deposition) process.
4
Modified Chemical Vapor Deposition (MCVD)
Process description
MCVD deposition at Acreo Fiber Lab in
Hudiksvall Sweden.
5
Process description
The MCVD process.
6
Collapse of the preform
Intense heating causes the hollow preform to
soften and collapse to a solid rod.
7
Outside Vapor Deposition (OVD)
Process description phase 1 - deposition
The OVD method for making a preform.
8
Process description phase 2 - the sintering
process
The porous preform is collapsed into a solid
glass rod.
9
Process description phase 3 fiber drawing
Fiber drawing.
10
Vapor-Phase Axial Deposition (VAD)
Production process
Schematic diagram showing the VAD method of
preform manufacture.
11
Fiber drawing
Fiber drawing principle drawing.
12
Fiber drawing
Fiber drawing - top of the tower.
Typical primary coated single-mode fiber.