In this paper we discuss silicon-based photonic integrated circuit technology for applications beyond the
telecommunication wavelength range. Silicon-on-insulator and germanium-on-silicon passive waveguide circuits are
described, as well as the integration of III-V semiconductors, IV-VI colloidal nanoparticle films and GeSn alloys on
these circuits for increasing the functionality. The strong nonlinearity of silicon combined with the low nonlinear
absorption in the mid-infrared is exploited to generate picosecond pulse based supercontinuum sources and optical
parametric oscillators that can be used as spectroscopic sensor sources.