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Broadband silicon grating couplers with high efficiency and a robust design
Optics Letters
|July 1, 2022
Summary
Researchers achieved record efficiency and bandwidth for silicon-on-insulator fiber-to-chip grating couplers using optimized design and fabrication. This breakthrough enhances optical communication technologies by improving light coupling between optical fibers and integrated photonic circuits.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
- Integrated Optics
Background:
- Fiber-to-chip grating couplers are essential for interfacing optical fibers with photonic integrated circuits.
- Existing designs often face limitations in efficiency, bandwidth, or fabrication complexity.
- Silicon-on-insulator (SOI) platforms offer advantages for cost-effective and high-performance photonic devices.
Purpose of the Study:
- To achieve record-high efficiency and bandwidth for fiber-to-chip grating couplers.
- To demonstrate a robust design and cost-effective fabrication process.
- To bridge the gap between theoretical predictions and experimental results in grating coupler performance.
Main Methods:
- Design optimization of geometrical parameters (period, fill factor) and mode matching.
- Fabrication on a silicon-on-insulator platform.
- Experimental measurement of coupling efficiency and bandwidth for TE polarization.
Main Results:
- Record coupling efficiency of -2.64 dB (54%) for TE polarization.
- 1 dB bandwidth of 67 nm and 3 dB bandwidth exceeding 100 nm.
- Full C + L band coverage achieved, demonstrating broad applicability.
Conclusions:
- The developed grating coupler design and fabrication process are highly effective.
- The achieved performance surpasses previous records and meets practical telecommunication requirements.
- This work validates theoretical models and provides a pathway for advanced photonic integration.
