What is the primary purpose of a uniform buffer in a fiber optic cable?

The primary purpose of a uniform buffer in a fiber optic cable is to reduce differential stress on the fibers within the cable. This is crucial because fiber optic cables are composed of delicate glass fibers that can be easily damaged if not properly supported. The uniform buffer surrounds the optical fibers and provides mechanical protection, which minimizes the risk of strain or stress that could lead to microbending or macrobending of the fibers.

By effectively managing these stresses, the uniform buffer helps maintain the integrity of the light transmission through the fibers, ensuring reliable performance and longevity of the fiber optic system. Additionally, a well-designed buffer allows for some movement of the fibers, accommodating thermal expansion and contraction and other environmental factors without compromising the fiber's performance.

The other options, while relevant to aspects of cable design, do not accurately reflect the primary function of the uniform buffer in fiber optic cables. Enhancing color, increasing flexibility, and providing electrical insulation may be features of cable design but do not specifically pertain to the role of the buffer in stress reduction.