Index-Matching Gel (Index-Matching Fluid) is a gel or fluid with a refractive index close to that of glass that is used to reduce refractive-index discontinuities which can lead to reflective losses in optical cables. The gel or fluid is typically used in optical fiber cables, where it is applied to the cable’s connectors in order to reduce the reflectance of light at the interface between two media of different refractive index.
In optical fiber cables, the index-matching gel or fluid is applied between two connectors, such as the ferrule and the connector housing. The gel or fluid works to reduce the reflectance of light at the interface between the two media, and thus improving the signal-to-noise ratio of the cable. This is because the gel or fluid helps to bridge the gap between the two media, meaning that light is not reflected at the interface, but instead passes through.
Index-Matching Gel or Fluid also helps to reduce the amount of power loss in a cable, as it works to reduce the amount of light that is reflected from the interface. This means that more light is able to pass through the cable, resulting in less power loss. Additionally, the gel or fluid helps to reduce the amount of noise in the cable, as it reduces the amount of light that is reflected from the interface. This reduces the amount of interference caused by reflections, resulting in a cleaner signal.
Overall, Index-Matching Gel or Fluid is an important part of optical fiber cables, as it helps to reduce refractive-index discontinuities that can cause reflective losses, as well as reducing the amount of power loss and interference in the cable. This ensures that the signal transmitted through the cable is of the highest quality, resulting in an improved connection.