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Related Experiment Video

Updated: Jun 22, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Published on: April 4, 2017

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

Goran Masanovic, Graham Reed, William Headley

|June 6, 2009

Summary

Efficiently coupling optical fiber light into semiconductor waveguides is challenging due to refractive index mismatches. This study demonstrates a novel Dual-Grating Assisted Directional Coupler, achieving 55% coupling efficiency.

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Last Updated: Jun 22, 2026

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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.