Multimode optical fiber
AssigneeSumitomo Electric Industries, Ltd.
InventorsManabu Shiozaki, Kazuhiro Yonezawa, Tadashi Enomoto
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Abstract
An embodiment of the invention relates to a GI-MMF with a structure for achieving widening of bandwidth in a wider wavelength range and improving manufacturing easiness of a refractive index profile in a core. In an example of the GI-MMF, a whole region of the core is doped with Ge and a part of the core is doped with P. Namely, the Ge-doped region coincides with the whole region of the core and the Ge-doped region is comprised of a partially P-doped region doped with Ge and P; and a P-undoped region doped with Ge but not intentionally doped with P.
Claims2
A multimode optical fiber comprising:
- a core extending along a predetermined axis and doped with germanium and fluorine;
- and
- a cladding provided on an outer peripheral surface of the core,
- wherein the core has a Graded-Index type refractive index profile formed by doping with the germanium and the fluorine,
- wherein in a cross section of the core perpendicular to the predetermined axis a germanium-doped region doped with the germanium coincides with a whole region of the cross section of the core,
- wherein in the cross section of the core, the germanium-doped region is comprised of a partially fluorine-doped region in which a relative refractive index difference with respect to the cladding, resulting from the doping with the fluorine, is controlled;
- and a fluorine-undoped region in which a doping amount of the fluorine is set to be not more than 5% of a maximum doping amount of the fluorine in the partially fluorine-doped region, and
- wherein in the germanium-doped region, the partially fluorine-doped region is arranged so as to surround the whole of the fluorine-undoped region.
Dependencies are inferred from the claim text.