Appeal No. 1998-2552
Application No. 08/292,977
APPENDIX
33. A method of producing an optical fiber secondary
preform by collapsing an over-cladding tube on an optical fiber
primary preform, said optical fiber primary preform having a
first means being adhered to one end of said optical fiber
primary preform which supports said optical fiber primary s
preform during rotation, said first means having a second means
for sealing a first end of said over cladding tube, said over-
cladding tube having a third means adhered to a second end of
said over
cladding tube to support said second end of said over-cladding
tube, said method comprising the steps of:
inserting a ring into an inner diameter of said third
means, said ring being concentric with said second end of said
over-cladding tube;
inserting a second end of said optical fiber primary
preform
through the inner diameter of said ring;
sealing said first end of said over-cladding tube by
heating
said first end of said over-cladding tube and the second means
of said first means;
rotating said over-cladding tube; and
collapsing said over-cladding tube on said optical fiber
primary preform by applying heat to said over-cladding tube when
said over-cladding tube is rotated under a predetermined
collapse
condition to produce said optical fiber secondary preform.
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