Sumitomo Electric Industries, Limited

Tomoaki Hatanaka

Yuki Kawaguchi

Chonde Tei

Tomoko Terauchi

A bending applying device includes three mandrels and applies bending to an optical fiber by winding the optical fiber onto the mandrels. The mandrels are alternately arranged at predetermined intervals such that outer circumferences of adjacent mandrels in a longitudinal direction of the optical fiber face each other in a non-contact manner. A diameter of the optical fiber is D, a radius of the mandrel is r, an interval between the adjacent mandrels in the first direction is 2r+d, a direction orthogonal to the first direction is a second direction, an interval between the adjacent mandrels in the second direction is s, and an angle θ between the second direction and a common internal tangent of the adjacent mandrels is 0 degrees or more and 45 degrees or less, and the formed angle θ satisfies following formula.

Bending-imparting device for measuring bending loss, and bending test device

An optical fiber bending loss measuring method for obtaining a bending loss of an optical fiber by applying bending to the optical fiber with mandrels provided between a feeding portion and a fixing portion and arranged alternately in a longitudinal direction of the optical fiber. The method includes fixing the optical fiber to the fixing portion by passing the optical fiber fed out from the feeding portion between the mandrels, moving the movable mandrel to a forward position and applying bending to the optical fiber by holding the optical fiber between the adjacent mandrels, and obtaining the bending loss of the optical fiber while the bending is applied to the optical fiber.

Growing community of inventors

Utsunomiya, Japan

Tomoaki Hatanaka