1.3 micrometer-band amplifying optical fiber preform

Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber


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428378, 428379, 428380, 428384, 428392, 428428, 428432, 4285428, 359341, B32B 1702




An optical fiber preform includes a core made from a fluoride glass which is doped with a rare earth, and a cladding surrounding the core. The cladding is made from one of an oxide glass and a fluoroxide glass. The core has a characteristic of amplification at 1.3 .mu.m-band. The cladding does not have absorption at 1.3 .mu.m-band. The preform is useful as a material for a fiber optical amplifier in optical communication systems.

patent: 4674835 (1987-06-01), Mimura
patent: 4874222 (1989-10-01), Vacha
patent: 4898777 (1990-02-01), Kindler
patent: 5062116 (1991-10-01), Christensen


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