Satomi Hatano received B.S. in Electrical Engineering, Tohoku University in 1972. Joined NTT Communications Laboratories in the same year, and has been engaged in the studies of optical fibers. Presently, he is also involved in the study of high-density optical fiber cables. Senior research Engineer at NTT, and Member, I.E.E.E.
Fiber excess length in a cable containing optical fiber ribbons
Article first published online: 21 MAR 2007
Copyright © 1987 Wiley Periodicals, Inc., A Wiley Company
Electronics and Communications in Japan (Part II: Electronics)
Volume 70, Issue 9, pages 82–90, 1987
How to Cite
Hatano, S., Kokubun, T., Hogari, K. and Katsuyama, Y. (1987), Fiber excess length in a cable containing optical fiber ribbons. Electron. Comm. Jpn. Pt. II, 70: 82–90. doi: 10.1002/ecjb.4420700909
- Issue published online: 21 MAR 2007
- Article first published online: 21 MAR 2007
A cable containing optical fiber ribbons in a loose tube is promising for high-density, multifiber and economical communication. This paper discusses the influence of excess fiber length.
Assuming that the optical fiber excess length (the difference between the lengths of the optical fiber and its container) causes the optical fiber to bend, the relationship between the excess length and sinusoidal bending radius has been obtained. It was found that the optical losses due to the sinusoidal bend of a graded-index multinode fiber with core and outer diameter of 50 and 125 μm respectively, were inversely proportional to the square of the minimum radius of curvature. Also, the loss characteristic is the same as that in case of the uniform spiral bend. Based on these results, the method of estimating the optical losses due to the excess length was obtained. It was confirmed that the measured optical loss agreed with the estimated loss.
It was found that the excess length ratio β should be restricted between −0.05 and 0.2 percent to minimize the optical losses and fiber failure probability.