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Reflectionless grating couplers for Silicon-on-Insulator photonic integrated circuits.

D Vermeulen¹, Y De Koninck, Y Li

¹Photonics Research Group, Department of Information Technology, Ghent University - imec, B-9000 Ghent, Belgium. Diedrik.Vermeulen@acacia-inc.com

|October 6, 2012

Summary

This study introduces a novel, inherently reflectionless grating coupler. The design redirects reflected light away from the entrance waveguide, improving optical performance on Silicon-on-Insulator platforms.

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Area of Science:

Photonics and Optical Engineering
Integrated Optics

Background:

Grating couplers are essential for coupling light into and out of integrated photonic circuits.
Unwanted reflections from grating couplers can degrade device performance and cause signal loss.

Purpose of the Study:

To propose and investigate a novel grating coupler design that is inherently reflectionless.
To provide design rules for this reflectionless grating coupler.
To validate the design using numerical simulations.

Main Methods:

Development of a novel grating coupler design concept.
Explanation of the design rules for achieving reflectionless operation.
Three-dimensional Finite-Difference Time-Domain (3D FDTD) simulations.

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Main Results:

The proposed grating coupler design effectively minimizes or eliminates back-reflections.
The design focuses reflected light away from the entrance waveguide.
Simulations confirm the reflectionless characteristics on a Silicon-on-Insulator platform.

Conclusions:

The novel grating coupler design offers a significant advancement in integrated photonics by eliminating detrimental reflections.
This design has the potential to enhance the efficiency and reliability of photonic integrated circuits.
The validated design rules provide a practical guide for future development.