The DL-CS6055A from DenseLight Semiconductors is a Superluminescent Diode with Wavelength 1580 to 1620 nm, Output Power 5 mW, Bandwidth (FWHM) 50 to 55 nm, Operating Current 200 to 225 mA, Forward Voltage 2 V. More details for DL-CS6055A can be seen below.