| 摘要 |
<p>An optical fibre preform is formed by condensing gaseous material into a quartz tube 10 which is heated using a natural gas burner 20. This saves cost and time and reduces water production, and thus the content of hydroxide (OH<SP>-</SP>) in the preform, decreasing the transmission loss of the optical fibre. The natural gas may be liquefied natural gas, LPG, methane or propane.</p> |
