The AS5B320EM50M from Anritsu Corporation is a Super Luminescent Diode (SLD) Module that operates at a wavelength of 1550 nm. It provides an optical output power of 25 mW and has optical isolation of 30 dB. This SLD module has a built-in optical isolator, monitor PD and TEC. It has a forward voltage of 24 V with a monitor current of 400-2000 μA and PD dark current of 0.1 μA. This SLD emits incoherent light with a spectral half width of 10-50 nm from a PFM (polarization-maintaining fiber). It is available in a butterfly package that measures 30 x 12.7 x 7.8 mm and is ideal for optical fiber sensor, Optical Coherence Tomography (OCT) and optical measurement applications.