The 850nm SM MEMS VOA from Seagnol Photonics is a Fiber Optic Attenuator with Wavelength Dependent Loss 0.8 to 2 dB, Attenuation 45 dB, Insertion Loss 1 to 1.2 dB, Return Loss 45 dB, Polarization Dependent Loss 0.1 to 0.3 dB. More details for 850nm SM MEMS VOA can be seen below.