The PROLITE-105 laser light source emits light at three wavelength that are used to transmit data through optical fibre on FTTx networks: 1310, 1490 and 1550 nm. It allows selecting easily the desired wavelength by means of direct access keys, in order to generate a modulated signal or to activate the automatic operation mode.

These light sources may be modulated with 270 Hz (1310 nm), 1 kHz (1490 nm) and 2 kHz (1550 nm). They are modulated at different frequencies to measure the attenuation of the fibre for the three wavelengths in combination with a power meter (such as PROLITE-67 or a PROLITE-77). Usually this measure is required to certificate telecommunications infrastructures.