On-chip parametric amplification with 26.5~dB gain at telecommunication   wavelengths using CMOS-compatible hydrogenated amorphous silicon waveguides
  We present the first study of parametric amplification in hydrogenated amorphous silicon waveguides. Broadband on/off amplification up to 26.5~dB at telecom wavelength is reported. Measured nonlinear parameter is 770~$\textrm{W}^{-1} \textrm{m}^{-1}$, nonlinear absorption 28~$\textrm{W}^{-1} \textrm{m}^{-1}$, bandgap $1.61$~eV. 
Bart Kuyken, St\'ephane Clemmen, Shankar Kumar Selvaraja, Wim   Bogaerts, Dries Van Thourhout, Philippe Emplit, Serge Massar...
physics.optics