Solution:

(1) Optical fibers should have maximum reproducibility.

(2) Fibers should be fabricated with good stable transmission characteristics i.e., the fiber should have invariable transmission characteristics in long lengths.

(3) Fibers must be fabricated in such a way that a joining (splicing) of the fiber should not affect its transmission characteristics and the fibers may be terminated or connected together with less practical difficulties.

(4) The fibers must be flexible to convert into practical cables without any degradation of their characteristics.

(5) Different sizes, refractive index, and refractive index profile, operating wavelengths material. Fiber must be available to meet different system applications.