Method of manufacturing optical fiber
AssigneeSumitomo Electric Industries, Ltd.
InventorsTakahiro NOMURA, Kazuyuki SOHMA
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Abstract
An optical fiber includes a glass fiber, and a resin coating layer covering an outer circumference of the glass fiber. In a spectrum acquired by measuring an amount of eccentricity of the glass fiber from a central axis based on an outer circumference of the resin coating layer at a plurality of measurement points set at a predetermined interval in an axial direction of the glass fiber and applying Fourier transform of a waveform representing the amount of eccentricity at each of the plurality of measurement points, a largest value of amplitude of the amount of eccentricity is 6 μm or less.
Claims7
A method of manufacturing an optical fiber, the method comprising:
- forming a glass fiber;
- forming a resin coating layer such that an outer circumference of the glass fiber is covered;
- curing the resin coating layer by using a predetermined curing device;
- and
- pulling the optical fiber the resin coating layer of which is cured,
- wherein forming the resin coating layer includes setting an outer circumferential diameter of the resin coating layer to 190 μm or less, and
- wherein pulling the optical fiber includes setting a circumference length of a largest roller among all rollers to 0.2 m or more, the largest roller consists of a turning roller located just beneath the curing device and a plurality of guide rollers located downstream from the turning roller, and
- wherein in a spectrum acquired by measuring an amount of eccentricity of the glass fiber from a central axis based on an outer circumference of the resin coating layer at a plurality of measurement points set at a predetermined interval in an axial direction of the glass fiber and applying Fourier transform of a waveform representing the amount of eccentricity at each of the plurality of measurement points, a largest value of amplitude of the amount of eccentricity is 6 μm or less.
A method of manufacturing an optical fiber, the method comprising:
- forming a glass fiber;
- forming a resin coating layer such that an outer circumference of the glass fiber is covered;
- curing the resin coating layer by using a predetermined curing device;
- and
- pulling the optical fiber the resin coating layer of which is cured,
- wherein forming the resin coating layer includes setting an outer circumferential diameter of the resin coating layer to 190 μm or less, and
- wherein pulling the optical fiber includes damping vibration of the optical fiber by using a vibration damper installed downstream of the curing device and upstream of a turning roller located just beneath the curing device, and
- wherein in a spectrum acquired by measuring an amount of eccentricity of the glass fiber from a central axis based on an outer circumference of the resin coating layer at a plurality of measurement points set at a predetermined interval in an axial direction of the glass fiber and applying Fourier transform of a waveform representing the amount of eccentricity at each of the plurality of measurement points, a largest value of amplitude of the amount of eccentricity is 6 μm or less.
A method of manufacturing an optical fiber, the method comprising:
- forming a glass fiber;
- forming a resin coating layer such that an outer circumference of the glass fiber is covered;
- curing the resin coating layer by using a predetermined curing device;
- and
- pulling the optical fiber the resin coating layer of which is cured,
- wherein forming the resin coating layer includes setting an outer circumferential diameter of the resin coating layer to 190 μm or less, and
- wherein pulling the optical fiber includes using a turning roller which is located just beneath the curing device and fixed separately from another member related to manufacturing of the optical fiber, and
- wherein in a spectrum acquired by measuring an amount of eccentricity of the glass fiber from a central axis based on an outer circumference of the resin coating layer at a plurality of measurement points set at a predetermined interval in an axial direction of the glass fiber and applying Fourier transform of a waveform representing the amount of eccentricity at each of the plurality of measurement points, a largest value of amplitude of the amount of eccentricity is 6 μm or less.
Dependencies are inferred from the claim text.