Abstract
The degenerate four-wave-mixing (DFWM) effect in Si quantum dot doped SiNx (SiNx:Si-QD) channel waveguide has been preliminarily demonstrated. By enhancing the optical nonlinearity of SiNx at 1550 nm with doped Si-QDs, the DFWM can be enhanced with its conversion efficiency of −46 dB in the SiNx:Si-QD channel waveguide with length of 8 mm. The nonlinear refractive index of the SiNx:Si-QD is estimated to be $\rm{3 \times 10}^{-14}\rm{ cm}^{2}\rm{/ W}$ . The chromatic dispersion analysis indicates that the SiNx:Si-QD channel waveguide exhibits 3-dB conversion bandwidth of larger than 16 nm. Such a SiNx:Si-QD waveguide is free of multi-photon absorption at 1550 nm even when injecting an intense laser pulse as large as 1.3 GW/cm2. These results show great potential of Si-QD doped SiNx waveguide for nonlinear optical processing.
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