Acta Optica Sinica, Volume. 43, Issue 19, 1913001(2023)
Low-Loss Apodized Grating Couplers Based on Lithium Niobate on Insulator
Fig. 2. Grating couplers in different design schemes. (a) Partial schematic of linearly chirped grating with linearly changed fill-factor and fixed period; (b) partial schematic of proposed linearly apodized grating; (c) cross-sectional schematic of proposed linearly apodized grating
Fig. 3. Variation trends of effective index ne and coupling efficiency. (a) Effective index ne as a function of etching depth e in TE0 mode at 1550 nm; (b) 2D contour map of coupling efficiency at 1550 nm as a function of e and R
Fig. 4. Effect comparison of uniform grating, apodized grating in Ref. [18], and apodized grating in this work. (a) Normalized field distributions at 1550 nm along x direction; (b) upward transmission; (c) coupling efficiency
Fig. 5. Grating couplers with etching inclination angle. (a) Cross-sectional schematic of waveguide with etching inclination angle; (b) cross-sectional schematic of apodized grating with etching inclination angle
Fig. 6. Diffraction electric field distribution and coupling efficiency. (a) Diffraction electric field distribution of apodized grating for TE polarization; (b) diffraction electric field distribution of apodized grating with etching inclination angle for TE polarization; (c) coupling efficiency of apodized grating with etching inclination angle as a function of Ffb,1
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Yakang Liu, Xuan She, Hongshuo Liu, Fei Huang, Kan Chen, Ran Bi, Lei Wang, Xiaowu Shu. Low-Loss Apodized Grating Couplers Based on Lithium Niobate on Insulator[J]. Acta Optica Sinica, 2023, 43(19): 1913001
Category: Integrated Optics
Received: Mar. 8, 2023
Accepted: Apr. 23, 2023
Published Online: Oct. 23, 2023
The Author Email: Xuan She (0013808@zju.edu.cn)