Fresnel Reflection is the reflection of light at the boundary between two media, like air and glass, described by the Fresnel equations. The amount of reflection depends on the angle of incidence and the refractive indices of the materials involved. This effect is important in applications such as anti-reflective coatings and optical devices, where minimizing reflection enhances efficiency.

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First Field Demonstration of Hollow-Core Fibre Supporting Distributed Acoustic Sensing and DWDM Transmission

We demonstrate a method for measuring the backscatter coefficient of hollow-core fibre (HCF), and show the feasibility of distributed acoustic sensing (DAS) with simultaneous 9.6-Tb/s DWDM transmission over a 1.6-km field-deployed HCF cable.