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http://hdl.handle.net/10397/90908
Title: | Two-dimensional grating coupler on an X-cut lithium niobate thin-film | Authors: | Chen, B Ruan, Z Hu, J Wang, J Lu, C Lau, APT Guo, C Chen, K Chen, P Liu, L |
Issue Date: | Jan-2021 | Source: | Optics express, 18 Jan. 2021, v. 29, no. 2, p. 1289-1295 | Abstract: | A two-dimensional grating coupler for coupling light between a standard single-mode fiber and ridge waveguides on an X-cut lithium niobate thin-film is designed and demonstrated. Using circular holes for grating cells, simulated coupling losses reach −3.88 dB at 1550 nm and −5.78 dB at 1563 nm with 1-dB bandwidths of 49 nm and 45 nm for P-polarized and S-polarized light inputs, respectively. Experimentally, peak coupling losses of −5.13 dB at 1561 nm and −7.6 dB at 1568 nm are obtained for P-polarized and S-polarized light inputs, respectively, and corresponding 1 dB bandwidths are about 30 nm. An approach to improve the coupling performance of the grating coupler is also proposed using two crossing ellipses as grating cells as well as a bottom metal reflector. The coupling loss and the polarization dependent loss are decreased to around −3.4 dB and 0.44 dB, respectively. | Publisher: | Optical Society of America | Journal: | Optics express | EISSN: | 1094-4087 | DOI: | 10.1364/OE.413820 | Rights: | © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement (https://www.osapublishing.org/library/license_v1.cfm#VOR-OA) The following publication B. Chen, Z. Ruan, J. Hu, J. Wang, C. Lu, A. Lau, C. Guo, K. Chen, P. Chen, and L. Liu, "Two-dimensional grating coupler on an X-cut lithium niobate thin-film," Opt. Express 29, 1289-1295 (2021) is available at https://doi.org/10.1364/OE.413820 |
Appears in Collections: | Journal/Magazine Article |
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