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High-modulus low-linear-expansion-coefficient loose-jacket optical fibers

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4 Author(s)
Yamamoto, Fumio ; Nippon Telegraph and Telephone Public Corporation ; Shuto, Y. ; Itoh, Hiroki ; Yamakawa, S.

Optical fibers loosely jacketed with high-modulus low-linear-expansion-coefficient polymers have been proposed, and the mechanical, thermal, and optical properties have been investigated. The loose-jacket tube is made of highly oriented polyoxymethylene (POM), which is produced by tensile-drawing the isotropic POM tube with dielectric heating. The oriented POM exhibits Young's moduli 20-40 GPa and linear expansion coefficients of the order of 10^{-5}-10^{-6}\deg C-1. Owing to the low linear expansion coefficients of the material, the oriented POM loose-jacket optical fiber has no low-temperature excess losses, which is due to fiber bends caused by thermal contraction of the loose tube, in the -60-80\deg C temperature range.

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Lightwave Technology, Journal of  (Volume:2 ,  Issue: 2 )