Optical Fiber Ribbon

Abstract: An optical fiber ribbon according to the present invention is provided with: a plurality of optical fibers arrayed along an array direction that is perpendicular to the lengthwise direction; and a plurality of joint sections. The plurality of joint sections are each formed between a pair of the optical fibers that are adjacent to each other with respect to the array direction. The plurality of joint sections are disposed non-contiguously with respect to the lengthwise direction and the array direction. The optical fiber ribbon has a first high-density region and a low-density region that are adjacent to each other with respect to the lengthwise direction. In the first high-density region, among the plurality of joint sections, at least two joint sections having mutually different positions with respect to the lengthwise direction and the array direction are disposed. The number density of the joint sections in the low-density region is lower than the number density of the joint sections in the first high-density region. The maximum value of the amount of increase in transmission loss that occurs with light having a wavelength of 1550 nm and propagated through the optical fibers in a kink test is not greater than 1 dB.

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