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Updated: Dec 13, 2025
07:55
Fabrication of Surface Acoustic Wave Devices on Lithium Niobate
Published on: June 18, 2020
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High-efficiency edge-coupling based on lithium niobate on an insulator wire waveguide
Applied Optics
|August 5, 2020
Summary
This study optimized edge-couplers for lithium niobate on insulator (LNOI) waveguides, achieving high coupling efficiency. The findings enhance integrated optics design for dense optical components.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
- Integrated Optics
Background:
- Single-crystal thin-film lithium niobate on insulator (LNOI) is a key material for integrated optics.
- Efficient light coupling is crucial for high-density optical components.
Purpose of the Study:
- To systematically study and optimize edge-coupling on LNOI waveguides.
- To improve coupling efficiency between laser chips and nanoscale LNOI waveguides.
Main Methods:
- Utilized an inverse taper-shaped spot-size converter (SSC).
- Employed the eigenmode expansion method for structural investigation and optimization.
- Considered single-mode conditions for LNOI waveguides across communication bands.
Main Results:
- Optimized edge coupler design parameters including inverse taper length and tip width, SiON waveguide dimensions, and sidewall angle.
- Achieved maximum coupling efficiencies of 54% (1550 nm), 48% (1310 nm), and 58% (850 nm) for quasi-TM mode in Z-cut LNOI.
- Demonstrated high coupling performance for LNOI-based edge couplers.
Conclusions:
- The study provides a deeper understanding of LNOI edge coupler functionality.
- Offers a method for designing high-efficiency edge couplers.
- Facilitates the advancement of high-density monolithic integrated optical components.
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