Optical waveguides – Optical fiber waveguide with cladding – Utilizing multiple core or cladding
Reexamination Certificate
2005-01-11
2005-01-11
Chang, Audrey (Department: 2872)
Optical waveguides
Optical fiber waveguide with cladding
Utilizing multiple core or cladding
C427S162000, C427S163100, C427S163200
Reexamination Certificate
active
06842574
ABSTRACT:
The car industry increasingly uses plastic optical fibers whose protective sheathing (4) is made of a polyamide. As unmodified PA poorly adheres to the fluoropolymers often used as the material for the fiber cladding (3), the plastic optical fiber (2, 3) moves in relation to the protective sheathing (4) when the temperature varies. To suppress this effect referred to as “pistoning”, the connectors and holders of the optical fibers must apply very large clamping forces to the protective sheathing (4) and the plastic optical fiber (2, 3) arranged therein, resulting in an increased signal attenuation. The use of a modified PA can clearly improve the adherence of the protective sheathing (4) to the cladding (3) of a plastic optical fiber which is made of a fluoropolymer. As the protective sheathing material, particularly a modified PA 12 whose maximum concentration of the carboxyl terminal groups of the polyamide is 15 μeq/g and whose concentration of the amino terminal groups is in the range of 50 μeq/g to 300 μeq/g may be used.
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Eichhorn Volker
Horn Hans-Matthias
Schaefer Joachim
Schmidt Ilona
Stoeppelmann Georg
Chang Audrey
Curtis Craig
EMS-Chemie AG
Nexsen Pruet , LLC
O'Toole J. Herbert
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