Wavelength stability in a hybrid photonic crystal laser through controlled nonlinear absorptive heating in the reflector

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Bakoz, Andrei P.
Liles, Alexandros A.
Gonzalez-Fernandez, Alfredo A.
Habruseva, Tatiana
Hu, Changyu
Viktorov, Evgeny A.
Hegarty, Stephen P.
O'Faolain, Liam
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The need for miniaturized, fully integrated semiconductor lasers has stimulated significant research efforts into realizing unconventional configurations that can meet the performance requirements of a large spectrum of applications, ranging from communication systems to sensing. We demonstrate a hybrid, silicon photonics-compatible photonic crystal (PhC) laser architecture that can be used to implement cost-effective, high-capacity light sources, with high side-mode suppression ratio and milliwatt output output powers. The emitted wavelength is set and controlled by a silicon PhC cavity-based reflective filter with the gain provided by a III-V-based reflective semiconductor optical amplifier (RSOA). The high power density in the laser cavity results in a significant enhancement of the nonlinear absorption in silicon in the high Q-factor PhC resonator. The heat generated in this manner creates a tuning effect in the wavelength-selective element, which can be used to offset external temperature fluctuations without the use of active cooling. Our approach is fully compatible with existing fabrication and integration technologies, providing a practical route to integrated lasing in wavelength-sensitive schemes.
Wave-guide , Silicon photonics , Optical interconnects , Modulator , Cavity , Power , Chip , Lithography
Bakoz, A. P., Liles, A. A., Gonzalez-Fernandez, A. A., Habruseva, T., Hu, C., Viktorov, E. A., Hegarty, S. P. and O’Faolain, L. (2018) 'Wavelength stability in a hybrid photonic crystal laser through controlled nonlinear absorptive heating in the reflector', Light: Science & Applications, 7(1), 39 (7pp). doi: 10.1038/s41377-018-0043-8