Dust particles, moisture, oils from fingerprints, and even microscopic scratches can disrupt the optical path, causing increased insertion loss (IL), degraded return loss (RL), and long-term reliability problems. Modern optical fiber networks have transformed global communications by offering unparalleled bandwidth and low attenuation. As these systems transition from controlled environments to real-world deployments, their performance becomes increasingly susceptible to small yet impactful issues—chief. Microbends are small-scale distortions in the fiber core caused by uneven pressure or tightly packed fibers. Fiber cladding consists of layers of lower-refractive index material in close contact with a core material of higher refractive index.
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