Optical waveguides – Optical fiber waveguide with cladding – Utilizing nonsolid core or cladding
Reexamination Certificate
2008-03-20
2009-06-02
Wood, Kevin S (Department: 2874)
Optical waveguides
Optical fiber waveguide with cladding
Utilizing nonsolid core or cladding
C385S123000, C385S140000
Reexamination Certificate
active
07542645
ABSTRACT:
An airline (AL) optical fiber (“AL fiber”) that has an AL region with airlines, with the AL region arranged relative to the fiber core so as to make the fiber bend insensitive. The AL region is capable of supporting one or more higher-order optical modes. One method of reducing multipath interference (MPI) includes accessing a section of the AL fiber and closing at least one of the airlines in the section. This serves to attenuate one or more higher-order modes, which reduces MPI. In one example, the AL fiber has an end section wherein the airlines are filled with a blocking material. An example blocking material is a curable adhesive that is wicked into the airlines via capillary action and then cured when the adhesive reaches a certain depth from the fiber end. In another example, the blocking material is formed by heating the AL fiber section to cause the section to melt and block the airlines, so that the melted AL fiber serves as the blocking material. The AL fiber with reduced MPI is particularly useful as a “jump” fiber, whose length is too short to rely on attenuating higher-order modes via a cable cut-off wavelength.
REFERENCES:
patent: 2007/0201802 (2007-08-01), Mihailov et al.
Hua Yan
Li Ming-Jun
Makrides-Saravanos Elli
Carroll Jr. Michael E.
Corning Cable Systems LLC
Wood Kevin S
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