Which method is best for your optical network depends on its operating wavelength (1310nm, 1550nm, 850nm), the amount of attenuation needed, gain used, connector compatibility, and the acceptable levels of signal distortion, among other factors. Fiber optic attenuators are passive devices used to reduce the power or intensity of an optical signal in a fiber optic communication system. You get LC/UPC male-to-female connectors, fixed 10dB attenuation, and options for 3dB, 5dB, or 7dB in the same line.