A high efficiency input/output coupler for small silicon photonic devices

Area of Science:

• Optoelectronics
• Semiconductor devices
• Photonics

Background:

• Coupling light from optical fibers to semiconductor waveguides presents significant challenges due to large refractive index differences.
• Existing methods lack the efficiency and robustness required for commercial applications in optoelectronics.

Purpose of the Study:

• To present experimental results of a novel Dual-Grating Assisted Directional Coupler for efficient optical coupling.
• To demonstrate a viable solution for the problematic light coupling in semiconductor optical waveguides.

Main Methods:

• Development and experimental testing of a Dual-Grating Assisted Directional Coupler.
• Characterization of the coupling efficiency between an optical fiber and a semiconductor waveguide.

Main Results:

• Successful demonstration of the novel coupling principle.
• Achieved a measured coupling efficiency of 55%.

Conclusions:

• The Dual-Grating Assisted Directional Coupler shows promise for efficient and robust optical coupling in semiconductor devices.
• This method offers a potential advancement for commercial applications in integrated photonics.