Fiber optic cables are composed of a glass or plastic core surrounded by polymer coatings, buffer tubes, and protective jackets. These materials have different thermal expansion coefficients, meaning they expand or contract at different rates when exposed to temperature changes. This mismatch can create mechanical stress, causing the fiber to bend slightly (microbending) or more significantly (macrobending), which allows light to escape from the core and increases signal attenuation .
At low temperatures, polymer coatings shrink faster than the silica core, generating axial compressive stress. This can lead to microbending, which increases signal loss. For example, single-mode fibers may experience up to a 50% increase in attenuation at -50°C compared to room temperature. Extremely low temperatures (below -55°C) can render fibers inoperable due to excessive attenuation. Additionally, any moisture trapped in the cable can freeze, expand, and damage the buffer tubes, further increasing the risk of faults .
High temperatures cause polymer coatings to expand more than the silica core, creating tensile stress. This can result in macrobending or microbending, leading to increased signal loss. Prolonged exposure to temperatures above 80°C can degrade coatings, soften materials, and accelerate aging of buffer tubes and jackets, potentially causing permanent fiber deformation and failure .
Temperature changes also affect the refractive index of the fiber, altering light propagation, mode distribution, and polarization. This can increase intrinsic attenuation, modal dispersion, and splice losses, ultimately raising the bit error rate (BER) and reducing signal quality .
Temperature is a critical factor in fiber optic cable performance. Both extreme heat and cold can induce mechanical stress, bending, and material degradation, leading to increased attenuation and potential faults. Selecting appropriate cable types, protective measures, and careful installation practices are essential to maintain reliable optical network performance .
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