Sumitomo Electric Industries, Limited

Sotaro Ida

Hiroki Ishikawa

Keisei Morita

Tadashi Enomoto

Kazuhiro Yonezawa

An optical fiber includes a glass fiber and a coating resin covering an outer periphery of the glass fiber. The glass fiber includes a core and a cladding. An outer diameter of the glass fiber is 99 &#x3bc;m or larger and 101 &#x3bc;m or smaller. The coating resin includes a cured material of an ultraviolet curing resin composition. An outer diameter of the coating resin is 160 &#x3bc;m or larger and 170 &#x3bc;m or smaller. A mode field diameter for light having a wavelength of 1310 nm is 7.2 &#x3bc;m or larger and 8.2 &#x3bc;m or smaller. Bending loss at a wavelength of 1550 nm when wound in a ring shape having a radius of 10 mm is 0.1 dB/turn or less. Bending loss at the wavelength of 1550 nm when wound in the ring shape having the radius of 7.5 mm is 0.5 dB/turn or less.

Optical fiber

An optical fiber includes a glass fiber and a coating resin covering an outer periphery of the glass fiber. The glass fiber includes a core, an inner cladding, a trench, and an outer cladding. An outer diameter of the glass fiber is 99 &#x3bc;m or larger and 101 &#x3bc;m or smaller. An outer diameter of the coating resin is 160 &#x3bc;m or larger and 170 &#x3bc;m or smaller. A mode field diameter for light having a wavelength of 1310 nm is 7.2 &#x3bc;m or larger and 8.2 &#x3bc;m or smaller. Bending loss at a wavelength of 1550 nm when wound in a ring shape having a radius of 10 mm is 0.1 dB/turn or less. Bending loss at the wavelength of 1550 nm when wound in the ring shape having the radius of 7.5 mm is 0.5 dB/turn or less.

An embodiment of the present invention relates to an MMF with a structure for reducing length dependence of optical characteristics while maintaining bend-insensitivity. The MMF has a trench portion provided between a core portion and a cladding portion and having a refractive index lower than that of the cladding portion. In a cross section of the MMF, the trench portion in at least a partial section of the MMF has a non-circularly symmetric shape with respect to an intersection between the optical axis and the cross section.

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Osaka, Japan

Sotaro Ida