Ultra-Fast Continuous Wavelength Sweep in III-V-on-SOI MOSCAP DFB Lasers

We demonstrate an ultra-fast athermal continuous wavelength-swept III-V-on-SOI MOSCAP DFB laser with a mode-hop-free-tuning up to 10 GHz in less than 2 ns. We also propose a new method to linearize the frequency response without any pre-distortion or active feedback in the gain’s current injection ramp. Instead, we polarize the III-V gain Section under direct current injection, and we drive the hybrid MOSCAP waveguide with an AC voltage signal. By optimizing its driving frequency, we demonstrate an ultra-fast athermal triangular-shaped time-varying frequency tuning with a speed of <inline-formula> <tex-math notation="LaTeX">$4\times 10 ^{4}$ </tex-math></inline-formula> PHz/s and a laser’s frequency excursion of 4 GHz.