Yes, extreme temperatures can affect both the performance and lifespan of optical cables. Fiber optic cables have revolutionized the way we communicate, transmit data, and access information. However, there is a common perception that fiber optic cables are fragile. Why doesn't the glass found within fiber optics break/shatter when the cord is bent? Glass is rigid and brittle, so how is it that you can bend it without it breaking (at least to some degree)? Archived post. While the glass fibers inside are fragile, modern fiber cables are engineered to withstand crushing forces, extreme temperatures, and even rodent attacks—making them vital for. Fiber glass is made from highly pure silica (SiO2) which reduces the presence of impurities that could cause brittleness. The glass is also often doped with various materials (like germanium or phosphorus) to modify its refractive index and mechanical properties, enhancing flexibility. Fiber glass. Other than serving as an alternative technology for transmitting data over long distances; fiber optic cables can also be used in various industries such as the automotive industry, the aviation industry etc. Despite their critical role in global connectivity, questions about their physical robustness persist.