Bef -based optical fibers

Details Bef -based optical fibers Bef -based optical fibers

C - Chemistry, Metallurgy

03

C

88/97

C03C 13/04 (2006.01) G02B 6/10 (2006.01)

Patent

CA 1284900

BeF2-BASED OPTICAL FIBERS Abstract Disclosed is BeF2-based optical fiber. Such fiber can have, in addition to low loss, other advantageous properties. For instance, BeF2-based dispersion shifted single mode fiber can have lower core-cladding index difference and larger core diameter than the corresponding SiO2-based fiber, and BeF2-based graded index multimode fiber can have larger bandwidth than the corresponding SiO2-based fiber. The inventive fibers have a core and a cladding containing at least 30 mol% BeF2, and may contain up to 40 mol% of AlF3, and one or more members of the group consisting of NaF, KF, MgF2, CaF2, PbF2, PF5, and SiF4. An exemplary and currently preferred glass has nominal composition (in mol percent) 30KF-(15-x)CaF2-xPbF2-10AlF3-45BeF2, with x< 15. Single mode fibers according to the invention have minimum total dispersion in the range 1.5-2.0µm, and typically have 0.25% ? .DELTA.esi ? ? 0.6%, and 2.5 µm ? aesi ? 3.4 µm, where .DELTA.esi and aesi are the equivalent step index core-cladding index difference and core radius, respectively. Rules and techniques that can advantageously be used to design BeF2-based single mode fibers are also disclosed.

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