The DD-100-11-1300/1550-9/125-S-50-3U3U-1-1-485:1-6-PC from OZ Optics Ltd. is a Fiber Optic Attenuator with Wavelength Dependent Loss Up to 0.3 dB (Attenuation), Attenuation 1 to 60 dB, Attenuation Resolution 0.01 dB, Insertion Loss 1 to 2 dB, Return Loss 50 dB. More details for DD-100-11-1300/1550-9/125-S-50-3U3U-1-1-485:1-6-PC can be seen below.