An object of this invention is to manufacture an optical fiber cable having optical fibers with small characteristic differences at a high yield. The p-n junction consists of two different semiconductor materials, one being of p-type and the other of n-type, both having predetermined crystallographic axes which are fusion bonded together to form a p-n junction. According to the present invention there are several embodiments of the splint, each suited to fit a different body part such as the limbs, the torso, the chest and the neck.