Our attenuators are a very high quality design using doped fiber to attenuate the signal. Our singlemode attenuators offer a operating wavelength range of 1250nm to 1600nm, covering both the common 1310nm and 1550nm operating wavelengths. The attenuation accuracy is +/- 0.5dB, up to 5dB and +/- 10% over 5dB. The return loss is >50dB for standard connectors and >60dB for APC connectors. Maximum transmission power is typically one watt. We stock attenuators for the following fiber optic connector types: ST, SC, SC/APC, FC, FC/APC, LC, LC/APC, MU.