An optical filter and methods of filtering are provided. The optical filter includes a hollow-core fiber including a first portion and a second portion. The first portion includes a hollow core having a first diameter and a cladding having a second diameter. The second portion includes a hollow core having a third diameter smaller than the first diameter and a cladding having a fourth diameter smaller than the second diameter.

 
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< Bias-control for optical Mach-Zehnder modulators with voltage-induced optical absorption

> Fiber optic cables and methods for forming the same

> Semi-tight optical fiber unit
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