Tensile strength measures the maximum pulling force a fiber optic cable can withstand before breaking. 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. Optical fiber experiences various stresses during its lifetime starting from proof-testing, cabling, installation and in-service life. For long term reliability prediction, it is required to determine in-service lifetime and in-service failure rate for various fiber stress histories like constant. Fiber-optic cables are the backbone of modern connectivity—powering 5G networks, global internet backbones, and data center interconnections with near-light-speed data transmission.