The RLT1550-40G from Roithner Lasertechnik is a Laser Diode with Wavelength 1563 to 1567 nm, Output Power 0.04 W, Output Power (CW) 0.04 W, Threshold Current 32 to 42 mA, Operating Current 0.163 to 0.192 A. More details for RLT1550-40G can be seen below.