The VOA1064-FC from Thorlabs Inc is a Fiber Optic Attenuator with Attenuation 1.3 - 50 dB, Attenuation Resolution 0.15 dB, Insertion Loss 1.3 dB, Operating Temperature 0 to 70 Degree C, Optical Power w 300 mW. More details for VOA1064-FC can be seen below.