The OSW12-1310-SM from Thorlabs Inc is a Fiber Optic Switch with Insertion Loss 0.7 - 1.5 dB, Operating Temperature 0 to 40 Degree C, Optical Power 300 mW, Polarization Dependent Loss 0.02 - 0.05 dB, Storage Temperature -40 to 70 Degree C. More details for OSW12-1310-SM can be seen below.