| CPC G02B 6/02395 (2013.01) [C03C 25/105 (2013.01); C03C 25/1065 (2013.01); G02B 6/02214 (2013.01)] | 17 Claims |
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1. An optical fiber comprising:
a glass fiber including a core and a cladding and having an outer diameter of 124.5 μm or more and 125.5 μm or less; and
a coating resin layer for surrounding an outer periphery of the glass fiber, the coating resin layer having a primary resin layer and a secondary resin layer,
wherein in the coating resin layer,
the primary resin layer surrounds the outer periphery of the glass fiber,
the secondary resin layer surrounds an outer periphery of the primary resin layer,
the primary resin layer has a thickness of 7.5 μm or more and 17.5 μm or less,
the primary resin layer has a Young's modulus of 0.10 MPa or greater and 0.50 MPa or less at 23° C.,
the secondary resin layer has a thickness of 5.0 μm or more and 17.5 μm or less,
the secondary resin layer has an outer diameter of 165 μm or more and 175 μm or less, and
the secondary resin layer has a Young's modulus of 1200 MPa or greater and 2800 MPa or less at 23° C.,
wherein in a spectrum obtained by measuring, at a plurality of measurement points set at predetermined intervals in an axial direction of the glass fiber, an eccentric amount of the glass fiber from a central axis based on the outer periphery of the secondary resin layer, the eccentric amount being measured based on a position of an outer periphery of the coating resin layer and a position of the outer periphery of the glass fiber that are obtained from an image of light penetrated through the optical fiber, and Fourier transforming a waveform representing the eccentric amount at each position of the plurality of measurement points, a maximum value of an amplitude of the eccentric amount is 6 μm or less, and
wherein a wavelength at which the amplitude of the eccentric amount is largest is 0.1 m or more.
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