LioniX international demonstrates an ultra-narrow linewidth tunable laser with linewidth of 10kHz and tunable over the whole C-band. The hybrid photonic integrated circuit (PIC) approach makes it possible that this external cavity laser is very compact and robust. The use of the low loss silicon-nitride PIC technology, allows for long cavity length and the narrow linewidth of the laser. The wavelength is tuned by local actuation of the phase in the integrated wavelength filter. Furthermore application specific functionality can easily be added on the PIC to include functionality like mux and demux, switches, delays etc.