Optical parametric amplifiers relying on the nonlinear four-wave mixing process have attracted much interest in optical communication, ultrafast signal processing, and quantum metrology. Here, we propose a dual-pump optical parametric amplifier based on a bilayer silicon-rich nitride waveguide with flattened dispersion. The amplifier can possess a high gain of 26.2 dB and a low wavelength-dependent gain ripple of 1 dB over a more-than-400-nm wavelength range. We also examine the amplification of an ultrashort soliton pulse with a peak power of 0.25 W and a pulse width varying from 7 to 20 fs. The gain can reach 19 dB, which is suitable for boosting low-energy broadband sources.
On-chip supercontinuum generation has attracted a great deal of attention in recent years. Among silicon-based materials, silicon nitride represents an attractive solution for on-chip supercontinuum generation due to its wide transparency window, relatively high Kerr nonlinearity, and negligible two-photon absorption. In this paper, we achieve a flat allnormal dispersion profile in the silicon nitride platform, with a flat dispersion from 600 nm to 2760 nm. Using the proposed waveguide, an ultra-flat (-6 dB) high-coherent octave-spanning supercontinuum covering from 638 nm to 1477 nm can be generated by launching a 250-fs 30-kW input pulse centered at 960 nm. The proposed supercontinuum is of great importance for achieving high-resolution optical coherence tomography and fully stabilized frequency comb sources.
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