Journal
OPTICS EXPRESS
Volume 29, Issue 2, Pages 1289-1295Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.413820
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Funding
- National Major Research and Development Program [2019YFB1803902]
- National Natural Science Foundation of China [61675069]
- Science and Technology Planning Project of Guangdong Province [2019A050510039]
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A two-dimensional grating coupler is designed and demonstrated for coupling light between a standard single-mode fiber and ridge waveguides on an X-cut lithium niobate thin-film. By using different shapes of grating cells, coupling losses and polarization dependent losses are reduced.
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. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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