Optical fiber transmission line
AssigneeSumitomo Electric Industries, Ltd.
InventorsNoriko Iwata, Takatoshi Kato, Keiichiro Fukuda
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Abstract
The present invention relates to an optical fiber transmission line having a structure offering superior connection loss characteristics at the fusion-spliced position between optical fibers. This optical fiber transmission line has at least first and second optical fibers that are fusion-spliced. Each of these first and second optical fibers has a core region doped with 10 mol % or more of Ge and has a mode field diameter with a minimum value of 7 μm or less at the wavelength of 1550 nm. The difference between the minimum mode diameter of the first optical fiber and that of the second optical fiber is 1 μm or less.
Claims7
An optical fiber transmission line comprising:
- a first optical fiber having a core region doped with a 10 mol % or more of Ge and the Peterman II mode field diameter with a first minimum value of 7 μm or less at a wavelength of 1550 nm;
- and
- a second optical fiber having one end fusion-spliced to that of said first optical fiber, said second optical fiber having a core region doped with 10 mol % or more of Ge and the Peterman II mode field diameter with a second minimum value of 7 μm or less at the wavelength of 1550 nm, a difference between the first and second minimum values being 1 μm or less;
- wherein the Peterman II mode field diameter of said first optical fiber, at a position separated by at least 2 mm from a fusion-spliced position between said first and second optical fibers, is enlarged so as to reach a value of 110% or more of the first minimum value, and the Peterman II mode field diameter of said second optical fiber, at a position separated by at least 2 mm from said fusion-spliced position between said first and second optical fibers, is enlarged so as to reach a value of 110% or more of the second minimum value.
Dependencies are inferred from the claim text.