The DD-100-11-1550-8/125-P-40-XX-3-1-485:1-6-DR 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 40 dB. More details for DD-100-11-1550-8/125-P-40-XX-3-1-485:1-6-DR can be seen below.