What is the "water peak" in optical fiber?

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1

I heard that optical fibers are afraid of water. Does this “water peak” refer to the optical fiber getting damp? Does it affect sensing at 1550nm?

2

The “Water Peak” is a crucial physical concept in fiber optics, but its literal name often leads to misunderstandings. Addressing your question, I will provide a rigorous academic explanation from both physical principles and engineering applications:

I. What is the