FC Attenuators are critical devices in fiber optic networks designed to reduce optical signal power with precision. Compatible with FC connectors, which feature a screw-on mechanism for secure and stable connections, these attenuators offer adjustable attenuation levels from 1 dB to. Fiber optic attenuators are devices used to reduce or monitor the power level of a fiber optic signal. Basic types of fixed attenuation include single mode, dual window and multimode in D4/PC, FC, FC/UPC, MU, SC, SC/APC and UPC, ST and ST/UPC style connectors. Use the filters on the left of the page to find the product you require. Available in bulkhead and feed-through designs, Amphenol FC adapters are available. Precision Micro-Optics offers a broad range of industry standard adapters.