These LC/UPC fixed attenuators reduce signal power in fiber optic networks by 20dB. Perfect for tuning signal levels in datacom, telecom, or CATV setups where power is too high for receivers. Do you know? in the world of optical communication, there is an handy gadget that can make signal transmission extremely smooth - that is the fc/upc optical fiber yin and yang attenuator! whether it is a male or female connector, it can be perfectly matched and the signal strength can be easily. MU Single-Mode Yin-Yang Fixed Optical Attenuator 10pcs Fiber Attenuator The Yin-Yang Type Fiber Optic Fixed Attenuator is a type of connector that has one end as an adapter and the other end as a connector. This 10-piece set features the unique yin and yang binaural design with 20dB attenuation, working at both 1310nm and 1550nm wavelengths.