The fiber end face is usually ground into an 8° bevel. The fiber end face is in closer contact and can reflect the light to the cladding through its bevel angle instead of directly returning to the light source, providing better connection performance. 2、Insertion loss and return loss of different end-faces. The typical polishing procedure is detailed, including the initial fiber preparation, the use of a ferrule, the multi-step polishing process with different grits, and the final inspection with a fiber microscope. The article also touches upon special techniques like angle polishing and side. When producing fiber optic patch cord assemblies, manufacturers use 3D interferometer (which is an optical interferometry instrument) to check the fiber optic connector endface and strictly control the dimensions of the connector endface. The 3D test mainly measures the radius of curvature, vertex. The geometries required are defined in several commonly used industry standards for end-face geometries, such as found in Telcordia GR-326, “Generic Requirements for Singlemode Optical Connectors and Jumper Assemblies” (despite the name of the document, the geometries defined in GR-326 are commonly. fiber optic connectors. The paper also discusses troubleshooting methods when re-polishing is required due to the various post polishing failures. Its industry standard return loss is -60dB.
