The 81940A from Keysight Technologies is a Laser with Power 10 to 14.5 dBm, Wavelength 1520 to 1630 nm, Output Power (CW) 10 to 14.5 dBm, Operating Temperature 10 to 35 Degree C, Storage Temperature -40 to 70 Degree C. More details for 81940A can be seen below.