The VOA780-APC from Thorlabs Inc is a Fiber Optic Attenuator with Attenuation 2.1 to 50 dB, Attenuation Resolution 0.15 dB, Insertion Loss <2.1 dB, Return Loss >40 dB, Operating Wavelength 760 to 800 nm. More details for VOA780-APC can be seen below.