Appeal No. 2002-2101
Application 09/068,540
Claims 6 and 8 are set forth below as illustrative of the
claims on appeal:
6. A monomode optical fiber made by a method comprising the
steps of:
providing a preform made of fluoride glass and comprising a
mother preform housed in an outer tube and leaving an empty
volume between an outside surface of the mother preform and an
inside surface of the outer tube, characterized in that an
intermediate tube is inserted in said empty volume, the
intermediate tube being of a material possessing viscosity at a
fiber-drawing temperature which is less than the viscosity(ies)
at said fiber-drawing temperature of said mother preform and of
said outer tube; and
drawing an optical fiber from said preform while retaining
the material of said intermediate tube as an integral portion of
said monomode optical fiber.
8. A doped monomode optical fiber made by a method
comprising the steps of:
providing a preform made of fluoride glass and comprising a
mother preform housed in an outer tube and leaving an empty
volume between an outside surface of the mother preform and an
inside surface of the outer tube, characterized in that an
intermediate tube is inserted in said empty volume, the
intermediate tube being of a material possessing viscosity at a
fiber-drawing temperature which is less than the viscosity(ies)
at said fiber-drawing temperature of said mother preform and of
said outer tube, and said mother preform having a core zone doped
with rare earth ions; and
drawing an optical fiber from said preform to form said
monomode optical fiber while retaining a material of said
intermediate tube as an integral portion of said monomode optical
fiber.
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