The PLS-30 includes the precise optical light sources designed for laboratory use. The customized design allows implementation of required optical sources in a 1U frame, which can be installed inside a 19” rack or used as a desktop in wide range of fiber testing systems. The PLS-30 provides an automatic power control loop to keep output power constant. The light source output ports are available on the front panel in separate FC/APC (SM) or FC/PC (MM) connector adapters or in one common port, with a switchable wavelength using an internal optical switch. The removable connector adaptor design allows the simple exchange of optical output adapters and easy maintenance and cleaning of the output connector ferrule after removing the connector adaptor.