在光缆的制造过程中，对光纤的保护主要有两个关键要求：一是尽量减少光纤所受的物理应力；二是确保光纤具有良好的防水性能。光缆的结构从外到内依次为塑料护层、金属护套、遇水膨胀的阻水层，以及含有油膏的缆芯，油膏与光纤紧密结合。光纤的防水设计包括四道防线：塑料护层、金属护套、阻水层和油膏。然而，人们可能会疑惑，同样是玻璃材质，为...

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