Optical waveguides – Having particular optical characteristic modifying chemical... – Of waveguide cladding
Patent
1995-12-12
1997-08-05
Ullah, Akm E.
Optical waveguides
Having particular optical characteristic modifying chemical...
Of waveguide cladding
G02B 600
Patent
active
056550464
ABSTRACT:
A glass composition comprises an oxyfluoride glass comprising silicon, a divalent metal, a monovalent metal, oxygen, and fluorine, satisfying requirements: (1) the silicon is present in an amount of 40% or more and 75% or less based on total number of cations; (2) the divalent metal is present in an amount of 30% or less based on total number of cations; (3) the monovalent metal is present in an amount of 18% ore more and 60% or less based on total number of cations; and (4) the fluorine is present in an amount of below 20% based on total amount of anions. An optical fiber comprises a clad made of the glass composition and a core made of a silicate glass comprising silicon dioxide, a divalent metal compound, and a monovalent metal compound in which (9) the clad glass contains more SiO.sub.2 than the core or (10) the clad glass contains fluoride(s) of the divalent metal and/or the monovalent metal.
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Sakaguchi Shigeki
Todoroki Shin-ichi
Nippon Telegraph and Telephone Corporation
Ullah Akm E.
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