What is the term for the space following a Fresnel reflection that covers up the backscatter?

The term describing the space following a Fresnel reflection where backscatter is effectively masked is known as a dead zone. In fiber optics, especially when discussing signal transmission and reflections from connectors or splices, the dead zone refers to the area where light signals cannot be accurately measured or interpreted due to interference from previously reflected signals.

This phenomenon is crucial in understanding the behavior of light within fiber optic systems. The dead zone occurs because the initial reflection of light creates a disturbed area where subsequent light signals may not be detected reliably as they can overlap with the reflections. This can affect the performance of the fiber optic communication system, particularly at joint points or connection areas.

In contrast, the other options like reflection zone, scattering area, or shadow zone do not specifically describe the masking effect of backscatter in relation to a Fresnel reflection. They might refer to different aspects of light behavior, but they don't capture the precise definition of the space that cannot be measured accurately due to Fresnel reflection.