Optical waveguides – Optical fiber waveguide with cladding – Utilizing multiple core or cladding
Patent
1996-08-30
1998-04-14
Ngo, John
Optical waveguides
Optical fiber waveguide with cladding
Utilizing multiple core or cladding
385142, 385144, G02B 622
Patent
active
057402973
ABSTRACT:
This invention relates to a dispersion-compensating fiber which can be drawn at a lower temperature and can further reduce optical transmission loss. This dispersion-compensating fiber comprises a core portion containing a high concentration of GeO.sub.2 and a cladding portion formed around the outer periphery of the core portion. The cladding portion comprises a first cladding containing fluorine or the like as an index reducer, a second cladding having a higher refractive index than that of the first cladding, and a third cladding which becomes a glass region substantially noncontributory to propagation of signal light. In particular, the third cladding contains a desired impurity such that the glass viscosity thereof becomes lower than that of the second cladding or pure silica cladding at a predetermined temperature.
REFERENCES:
patent: 4123242 (1978-10-01), Imoto et al.
patent: 4923279 (1990-05-01), Ainslie et al.
patent: 4974932 (1990-12-01), Nattermann et al.
patent: 5106402 (1992-04-01), Geittner et al.
patent: 5448674 (1995-09-01), Vengsarkar et al.
Fukuda Chie
Kanamori Hiroo
Onishi Masashi
Ngo John
Sumitomo Electric Industries Ltd.
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