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4 March 2019 Compound period grating coupler for double beam generation and steering
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Proceedings Volume 10923, Silicon Photonics XIV; 109231F (2019)
Event: SPIE OPTO, 2019, San Francisco, California, United States
Grating coupler is one of the most basic integrated photonic components. Due to the excellent performance of compact non-mechanical beam steering, it has attracted a lot of research interest. Here we propose a new compound period grating coupler, which can couple the waveguide mode into two radiation modes with different angles by combining two grating structures with different periodicities. Therefore, the extra beam doubles the beam steering range. We numerically demonstrate this idea, and a steering range of 26.20 degree is observed within the wavelength tuning range of 1500 nm to 1600 nm. The compound period grating structure with DBRs (distributed Bragg reflectors) as the substrate has also been demonstrated numerically, and its energy leakage to the substrate is highly suppressed. Furthermore, investigation of fabrication tolerance shows the new structure can be fabricated with the current CMOS technology.
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Dachuan Wu, Wei Guo, and Yasha Yi "Compound period grating coupler for double beam generation and steering", Proc. SPIE 10923, Silicon Photonics XIV, 109231F (4 March 2019);

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