The MCDD-1000 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 4 dB, Return Loss 35 dB, 40 dB, 50 dB, 60 dB. More details for MCDD-1000 can be seen below.