The SLD-1550-9MM-50 from Nolatech is a Superluminescent Diode with Wavelength 1540 to 1570 nm, Output Power 40 to 50 mW, Bandwidth (FWHM) 20 to 25 nm, Forward Voltage 2.5 V, Forward Current 450 to 500 mA. More details for SLD-1550-9MM-50 can be seen below.