Removal of --OH impurities from fiber optic precursor materials

Glass manufacturing – Processes – Forming product or preform from molten glass

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

427163, 210754, C03C 2500

Patent

active

043103413

ABSTRACT:
The presence of hydroxyl impurities (--OH) in optical fiber precursor materials produces optical losses in fibers made from the precursor material, as in the modified chemical vapor deposition process. Typical precursor materials include SiCl.sub.4, GeCl.sub.4, POCl.sub.3, and PCl.sub.3. Losses due to --OH impurities occur near various wavelengths of current interest for optical communications systems. Adding chlorine and PCl.sub.3 to impure SiCl.sub.4, GeCl.sub.4, or POCl.sub.3 reduces the amount of --OH impurities and produces POCl.sub.3 and HCl. The HCl may be readily removed, while the POCl.sub.3 is typically left in the material. Bromine may be used instead of chlorine, and PBr.sub.3 may be used instead of PCl.sub.3. In addition, --OH impurities in PCl.sub.3 may be removed by the addition of chlorine or bromine, with the resulting HCl or HBr typically being removed.

REFERENCES:
patent: 2771416 (1956-11-01), Ryan
patent: 3296069 (1967-01-01), Kowalski
patent: 3733266 (1973-05-01), Bishop
patent: 3929637 (1975-12-01), Appleby
patent: 3944487 (1976-03-01), Davis
patent: 4162908 (1979-07-01), Rau
patent: 4217027 (1980-08-01), MacChesmey
Purity Examination of Silicon and Germanium Halides by Long-Path Infrared Spectrophotometry, Rand, Analytical Chemistry, vol. 35. p. 2126-2131, (1963).
Chlorine Drying of a Doped Deposited Silica Preform Simultaneous to Consolidation, Aronson, Conference on Optical Fibers Communication, Mar. 6-8, 1979, Washington, D.C., IEEE catalog No. 79CH1431-6, QEA, pp. 54-55.
Moriyama, "Fabrication of Ultra-Low-OH Content Optical Fibers with VAD Method," Conference: Sixth European Conference on Optical Communication, York, England, 16-19, Sep. 1980.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Removal of --OH impurities from fiber optic precursor materials does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Removal of --OH impurities from fiber optic precursor materials, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Removal of --OH impurities from fiber optic precursor materials will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1539586

All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.