BeF.sub.2 -based optical fibers

Details BeF.sub.2 -based optical fibers BeF.sub.2 -based optical fibers

1986-02-20

1987-10-13

Lee, John

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 37, 501 40, 501123, G02B 616

Patent

active

046994645

ABSTRACT:
Disclosed is BeF.sub.2 -based optical fiber. Such fiber can have, in addition to low loss, other advantageous properties. For instance, BeF.sub.2 -based dispersion shifted single mode fiber can have lower core-cladding index difference and larger core diameter than the corresponding SiO.sub.2 -based fiber, and BeF.sub.2 -based graded index multimode fiber can have larger bandwidth than the corresponding SiO.sub.2 -based fiber. The inventive fibers have a core and a cladding containing at least 30 mol % BeF.sub.2, and may contain up to 40 mol % of AlF.sub.3, and one or more members of the group consisting of NaF, KF, MgF.sub.2, CaF.sub.2, PbF.sub.2, PF.sub.5, and SiF.sub.4. An exemplary and currently preferred glass has nominal composition (in mol percent) 30KF-(15-x)CaF.sub.2 -xPbF.sub.2 -10AlF.sub.3 -45BeF.sub.2, with x.ltoreq.15. Single mode fibers according to the invention have minimum total dispersion in the range 1.5-2.0 .mu.m, and typically have 0.25%.ltoreq..DELTA..sub.esi .ltoreq.0.6%, and 2.5 .mu.m.ltoreq.a.sub.esi .ltoreq.3.4 .mu.m, where .DELTA..sub.esi and a.sub.esi are the equivalent step index core-cladding index difference and core radius, respectively. Rules and techniques that can advantageously be used to design BeF.sub.2 -based single mode fibers are also disclosed.

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