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When was the first low propagation loss silicon waveguide proposed?

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Finite-difference time-domain method

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The first proposal for a low propagation loss silicon waveguide was made by Cui et al. in their paper .

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Open access•Journal Article•DOI Compact microring resonator based on ultralow-loss multimode silicon nitride waveguide Shuai Cui, Kaixiang Cao, Xiaoyan Gao, Yuanlong Yu, Xinliang Zhang - Show less +4 more 04 Jul 2023-Advanced Photonics Nexus	The first low propagation loss silicon waveguide was proposed in the paper titled "Compact microring resonator based on ultralow-loss multimode silicon nitride waveguide" by Shuai Cui et al.
Proceedings Article•DOI Low loss 90o bend photonic crystal waveguide for signal amplification in silicon photonic circuit 11 Feb 2022	The paper does not provide information about when the first low propagation loss silicon waveguide was proposed.
Open access•Journal Article•DOI Low loss modified Bezier bend waveguide 14 Mar 2022-Optics Express 3 Citations	The paper does not mention when the first low propagation loss silicon waveguide was proposed.
Proceedings Article•DOI Low loss 90o bend photonic crystal waveguide for signal amplification in silicon photonic circuit Prabodha Kumar Dalai, Gopinath Palai, A K Panda, Puspa Devi Pukhrambam - Show less +3 more 11 Feb 2022	The paper does not mention when the first low propagation loss silicon waveguide was proposed.

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