What risk does moisture pose to the optical fiber inside a splice closure?

Moisture poses a significant risk to the optical fiber inside a splice closure primarily because it can cause the fiber to become opaque, which leads to degradation of the signal being transmitted through the fiber. When moisture infiltrates the splice closure, it can interfere with the optical properties of the fiber. This interference can result in increased attenuation, which means that the signal strength is diminished as it travels along the fiber. The presence of moisture disrupts the clarity and purity of the light transmission, leading to a reduction in performance and reliability of the communication link.

Furthermore, if moisture collects in significant quantities, it can also cause physical damage over time due to swelling and freezing, complicating repairs and maintenance. Therefore, ensuring that splice closures are properly sealed and protected from moisture is essential for maintaining the integrity and functionality of fiber optic cables.