Multimode optical fiber and method of manufacturing the same
AssigneeSumitomo Electric Industries, Ltd.
InventorsItaru SAKABE, Keiko NISHIDA, Manabu SHIOZAKI
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Abstract
The present invention relates to a multimode optical fiber which can provide a smooth cut face suitable for fusion splicing between fibers. The multimode optical fiber has at least a core extending along a central axis and having an α-power refractive index profile, and a cladding, and a residual stress distribution in the core along a radial direction from the central axis has a shape with a maximum at a position intersecting with the central axis.
Claims12
A multimode optical fiber comprising:
- a core having an α-power refractive index profile;
- and
- a cladding provided outside the core,
- wherein a residual stress distribution along a radial direction from a central axis of the multimode optical fiber has a maximum value within the core, and
- wherein the residual stress distribution has a shape so that a residual stress discontinuously decreases at an interface between the core and an outside layer being in direct contact with the core, and that the residual stress is minimized outside the core.
A manufacturing method for manufacturing a multimode optical fiber, the manufacturing method comprising:
- preparing an optical fiber preform comprising:
- an inside glass region to become a core after drawing, said inside glass region having an α-power refractive index profile;
- and an outside glass region to become a cladding after the drawing, said outside glass region being provided outside the inside glass region;
- and
- drawing one end of the optical fiber preform prepared, under a tension of not more than 40 g and under heat.
Dependencies are inferred from the claim text.