Chinese Optics Letters, Volume. 20, Issue 9, 090501(2022)

Double-groove rectangular gratings for high-efficiency wideband vertical coupling in planar-integrated optical systems

Guoqing Ma1,2, Changhe Zhou1,2, Yongfang Xie3, Ge Jin3, Rongwei Zhu1,2, Jin Zhang1, Junjie Yu1,2、*, and Guohai Situ1,2、**
Author Affiliations
  • 1Laboratory of Information Optics and Optoelectronic Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Institute of Photonics Technology, Jinan University, Guangzhou 510000, China
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    Figures & Tables(5)
    Schematic diagram of the grating coupler based on the double-groove structure. The green arrow represents the polarization direction, port #1 represents the reflective 1st order, and ports #2, #3, and #4 represent the transmitted +1st, 0th, and −1st orders, respectively.
    Simulation results of the electric field inside the substrate with the double-groove grating coupler when the Gaussian wave from a single-mode fiber is normally incident with TE polarization. The inset (in the red box) is the enlarged electric field distribution within the grating region.
    Relationship between the coupling efficiency calculated by the RCWA, SA algorithms as well as FEM, and the working wavelength λ (a) in the C band and (b) in the C+L band, and (c) electric field distribution diagram at the central wavelength of λ = 1550 nm.
    Simulation results of 1000 samples of the grating couplers based on the Monte Carlo method. The average efficiencies of the couplers in the (a) C and (b) C+L bands for these 1000 samples; statistical distributions of the efficiency of these 1000 samples in the (c) C and (d) C+L bands.
    • Table 1. Structure Parameters and Diffraction Efficiencies of Two Double-Groove Grating Couplers Optimized for TE Polarization Working in the C and C+L Bands, Respectively

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      Table 1. Structure Parameters and Diffraction Efficiencies of Two Double-Groove Grating Couplers Optimized for TE Polarization Working in the C and C+L Bands, Respectively

      Bandh1 (µm)h2 (µm)x1 (µm)x2 (µm)x3 (µm)Λ (µm)ηTE1 (%)ηTE1 (%)
      C (1535–1565 nm)0.3310.290.1470.8731.1091.46797.31.5
      C+L (1535–1625 nm)0.3410.270.1480.8931.1371.47692.81.6
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    Guoqing Ma, Changhe Zhou, Yongfang Xie, Ge Jin, Rongwei Zhu, Jin Zhang, Junjie Yu, Guohai Situ. Double-groove rectangular gratings for high-efficiency wideband vertical coupling in planar-integrated optical systems[J]. Chinese Optics Letters, 2022, 20(9): 090501

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    Paper Information

    Category: Diffraction, Gratings, and Holography

    Received: Jan. 16, 2022

    Accepted: May. 17, 2022

    Posted: May. 18, 2022

    Published Online: Jun. 16, 2022

    The Author Email: Junjie Yu (junjiey@siom.ac.cn), Guohai Situ (ghsitu@siom.ac.cn)

    DOI:10.3788/COL202220.090501

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