Structural design for nonmetallic optical fiber cables made of high-modulus and low linear-expansion coefficient polymer tubes

This paper describes a design method for a simple structure nonmetallic optical fiber cable, consisting of stranded loose tubes which are made from a high Young\´s modulus and low linear-expansion coefficient new polymer. First, the Young\´s modulus and stranding pitch of the tube unit to effectively bear all laying tension have become obvious from mechanical investigation. The allowable region between the pitch and optical fiber excess length also became obvious. In the allowable region, no additional loss due to tube characteristics was observed in the wide range of C. Moreover, it is shown that good performance of the cable using the new polymers is not attained using conventional cable materials.