AFL：2025年单模光纤在超大规模和AI数据中心中的微弯损耗白皮书（英文版）

Inner Primary Coatings – Soft Coating for Cushioning and Stress Reduction The inner primary coating, which is in direct contact with the glass fiber, is designed to be a soft cushioning layer (a low Young’s modulus - a measure of a material’s stiffness or elasticity). This softness allows it to absorb and cushion external stresses, such as lateral pressures from neighbouring fibers or other cable elements or temperature-induced contractions. Experimental studies show that reducing the modulus