Efficient and polarization insensitive edge coupler based on cascaded vertical waveguide tapers

We propose an efficient and polarization-insensitive edge coupler (EC) constructed principally with two cascaded vertical waveguide tapers. The proposed edge coupler only requires ordinary 365 nm (i-line) ultraviolet source for lithography process. We experimentally demonstrate the proposed EC on tw...

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Bibliographic Details
Published inOptics express Vol. 31; no. 20; pp. 31796 - 31805
Main Authors Zhang, Mengruo, Wu, Jieyun, Zhao, Zhiying, Chen, Kaixin
Format Journal Article
LanguageEnglish
Published 25.09.2023
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Summary:We propose an efficient and polarization-insensitive edge coupler (EC) constructed principally with two cascaded vertical waveguide tapers. The proposed edge coupler only requires ordinary 365 nm (i-line) ultraviolet source for lithography process. We experimentally demonstrate the proposed EC on two kinds of photonic integrated circuit (PIC) platforms: silicon nitride (Si 3 N 4 ) and lithium niobate thin film. Both achieve polarization-insensitive fiber chip coupling efficiency of >70% in the C-band. Our proposed EC have the advantages of efficient, cost-saving, and easy to implement and could serve as an effective solution to facilitate low-loss chip-fiber coupling.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.498764