Is it made of glass, will it break if dropped on the floor like a glass cup?
Although optical fibers are primarily made of high-purity silica glass (\text{SiO}_2), they absolutely will not shatter if dropped on the ground like an ordinary glass cup.
I. Analysis of Physical Mechanisms: Why They Don’t Break When Dropped?
From a physical and mechanical perspective, damage from falling objects primarily depends on the kinetic energy at impact and the instantaneous stress generated:
- Extremely Small Mass and Kinetic Energy:
The outer diameter of the cladding of a standard single-mode optical fiber is only 125\ \mu\text{m} (approximately the thickness of a human hair). Due to its extremely light mass and a very high surface area to volume ratio, the fiber experiences significant air resistance when falling through the air, resulting in a very low terminal velocity and negligible impact kinetic energy. - Lack of Geometric Features Causing Glass Cup Fracture:
When macroscopic glass objects like wine glasses or thick glass tumblers fall, their weight and rigid structure cause immense stress concentration at the point of impact, which rapidly expands into through-cracks. In contrast, flexible and slender glass fibers only undergo elastic bending upon contact with the ground, absorbing the minuscule impact energy.
II. True Mechanical Properties of Optical Fibers
While optical fibers are not susceptible to