Insertion loss and return loss testing are essential in fiber manufacturing, especially as data centers and AI‑driven infrastructures rely more on high fiber and connector counts. Multimode fiber carries many transmission modes, unlike singlemode fiber, making it more sensitive to launch conditions and mode distribution. This affects testing accuracy, as non‑compliant encircled flux can lead to inconsistent or misleading insertion loss results. Understanding multimode behavior and ensuring EF‑compliant testing is crucial for reliable performance in modern high‑density optical environments.

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