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High-Performance All-Optical Logic Operations Using Ψ-Shaped Silicon Waveguides at 1.55 μm.

Amer Kotb^1,2, Kyriakos E Zoiros³, Chunlei Guo⁴

¹School of Chips, XJTLU Entrepreneur College (Taicang), Xi'an Jiaotong-Liverpool University, Taicang, Suzhou 215400, China.

|September 28, 2023

Summary

This study demonstrates all-optical Boolean logic gates using novel silicon waveguides. These compact devices offer higher contrast ratios and faster speeds for optical computing applications.

Keywords:

contrast ratio logic operations Ψ-shaped silicon waveguide

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Last Updated: Jul 15, 2025

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Area of Science:

Photonics and Optical Engineering
Integrated Optics
Silicon Photonics

Background:

Boolean logic operations are fundamental to computing.
All-optical logic gates promise faster and more energy-efficient computation.
Existing designs face challenges in speed, size, and performance.

Purpose of the Study:

To simulate a complete family of basic Boolean logic operations (XOR, AND, OR, NOT, NOR, NAND, XNOR).
To utilize compact Ψ-shaped silicon-on-silica optical waveguides for all-optical logic.
To evaluate the performance of these logic gates using the contrast ratio (CR) metric.

Main Methods:

Finite-Difference Time-Domain (FDTD) solutions were employed for simulation.
A Ψ-shaped waveguide comprising four slots and one microring resonator was designed.
The operating principle relies on constructive and destructive interference of optical beams.
Performance was assessed based on the contrast ratio (CR).

Main Results:

Successful simulation of all basic Boolean logic operations.
Demonstration of all-optical logic using compact silicon waveguides.
Achieved higher contrast ratios (CRs) compared to existing designs.
Indicated potential for faster switching speeds in optical computations.

Conclusions:

Compact Ψ-shaped silicon waveguides are effective for realizing all-optical Boolean logic gates.
The proposed design offers superior performance in terms of CR and speed.
This work contributes to advancements in integrated photonics for optical computing.