Fujikura Limited

Takeshi Yoshida

Shoji Tanigawa

Tomohiro Nunome

Ryo Omiya

Akira Oshima

An optical fiber measurement device includes a light source, a light detector, a direction-changing member, and a tension-applying member. The light source emits light toward an optical fiber. The light detector receives the light that has propagated through the optical fiber. The optical fiber is hung on the direction-changing member. The direction-changing member changes an extending direction of the optical fiber to extend downward, the optical fiber being optically connected to the light source and the light detector at each of two end parts of the optical fiber. The tension-applying member applies a tension to the optical fiber hanging from the direction-changing member.

Optical fiber measurement device and method for bending optical fiber

An optical fiber is constituted by: a three-layer structured core which includes, a first core (having a relative refractive index difference of &#x394;in a region of a radius of R), a second core (having a relative refractive index difference of &#x394;in a region from the radius Rto a radius of R), and a third core (having a relative refractive index difference of &#x394;in a region from the radius of Rto a radius of R), wherein the relative refractive index differences have relationships of &#x394;, and &#x394;, when &#x394;=X and &#x394;=Y, (X+Y)&#x3e;0.4% is satisfied, and X and Y satisfy 0.25%&#x3c;X&#x3c;0.6%, 0.1%&#x2266;Y&#x2266;0.6%, and a relationship of (2*X&#x2212;0.7)%&#x3c;Y&#x3c;(X/2+0.4)%, thereby satisfying the G652 standard and having an SBS threshold equal to or higher than that of an optical fiber having the same MFD by +3 dB or higher.

Growing community of inventors

Sakura, Japan

Takeshi Yoshida