the solute is glass and the solvent is fiber im sure at about 1%

The main part of an optical fiber is a glass fiber (NOT hollow) within another glass fiber of another type of glass. Both types of glass have a different index of refraction; the signal travels through the inner glass fiber.

Depends on the material of that fiber glass weigh.

Fiber glass is a synthetic building material. It is really made of glass, but is processed in such a way as to be strong, light weight, and durable.

My tennis raquet is made of fiber glass. Speed boats made of fiber glass really go fast. Fiber glass makes good insulation.

In fiberglass the solute if glass and the solvent is the fiber. The amount of fiber in the whole composition is only 1%.