The APC polishing process grinds the connector end at an 8-degree angle, creating a tilted surface that directs reflected light away from the source. This unique angle nearly eliminates back reflection, making APC connectors the best choice for analog applications that demand the. “APC” stands for Angled Physical Connect. However, the return loss of the 9-degree angle SC/APC Fiber Optic Patch Cord can reach above -65dB. Proven by rich experience and experimental verification, an angle of 8-degree is the best. An angled connector is typically -65dB or lower. According to different end face angles, there are three types of optical fiber end face polishing methods: PC, UPC, and APC. The 8° angled bevel makes the fiber end face tighter and reflects light through its beveled angle to the cladding instead of returning directly to the source, providing better connection performance.