Mr. Wei Guo Profile

Wei Guo

at Univ of Michigan-Dearborn

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Proceedings Article | 4 March 2019 Paper

Compound period grating coupler for double beam generation and steering

Dachuan Wu, Wei Guo, Yasha Yi

Proceedings Volume 10923, 109231F (2019) https://doi.org/10.1117/12.2507585

KEYWORDS: Beam steering, Waveguide modes, Waveguides, Silicon, Wavelength tuning, Wave propagation, Tolerancing, Optical design, Refractive index, Metals

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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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