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Compound period grating coupler for double beam generation and steering
Author(s): Dachuan Wu; Wei Guo; Yasha Yi
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Paper Abstract

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.

Paper Details

Date Published: 4 March 2019
PDF: 9 pages
Proc. SPIE 10923, Silicon Photonics XIV, 109231F (4 March 2019); doi: 10.1117/12.2507585
Show Author Affiliations
Dachuan Wu, Univ. of Michigan-Dearborn (United States)
Wei Guo, Univ. of Michigan-Dearborn (United States)
Yasha Yi, Univ. of Michigan-Dearborn (United States)


Published in SPIE Proceedings Vol. 10923:
Silicon Photonics XIV
Graham T. Reed; Andrew P. Knights, Editor(s)

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