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Chin. Phys. B, 2021, Vol. 30(2): 024206    DOI: 10.1088/1674-1056/abbc00
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Polarization-independent silicon photonic grating coupler for large spatial light spots

Lijun Yang(杨丽君)†, Xiaoyan Hu(胡小燕), Bin Li(李斌), and Jing Cao(曹静)
Information Science Academy of China Electronics Technology Group Corporation, Beijing 100086, China
Abstract  We design and demonstrate a one-dimensional grating coupler with a low polarization-dependent loss (PDL) for large spatial light spots. Based on current fabrication conditions, we first utilize genetic algorithms to find the optimal grating structure including the distributions of duty and periods, making the effective refractive index of transverse electric mode the same as that of transverse magnetic mode. The designed grating coupler is fabricated on the common silicon-on-insulator platform and the PDL is measured to be within 0.41 dB covering the C-band.
Keywords:  silicon photonics      grating coupler      polarization-dependent loss  
Published:  18 January 2021
PACS:  42.82.-m (Integrated optics)  
  42.82.Et (Waveguides, couplers, and arrays)  
  42.79.Dj (Gratings)  
  42.25.Ja (Polarization)  
Fund: Project supported by the National High Technology Research and Development Program of China (Grant No. 18-H863-04-ZD-006-007-01).
Corresponding Authors:  Corresponding author. E-mail: ylj14@tsinghua.org.cn   

Cite this article: 

Lijun Yang(杨丽君), Xiaoyan Hu(胡小燕), Bin Li(李斌), and Jing Cao(曹静) Polarization-independent silicon photonic grating coupler for large spatial light spots 2021 Chin. Phys. B 30 024206

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