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Related Experiment Video

Updated: Sep 29, 2025

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

All optical half-adder/subtractor using photonic-crystal-based nonlinear cavities.

Yanfeng Fang, Xiaoping Tang

|March 25, 2022

Summary

This study presents a novel compact optical circuit capable of performing both addition and subtraction. It addresses previous limitations by ensuring consistent logic 1 intensity levels across all outputs.

Area of Science:

Photonics
Optical Computing
Integrated Optics

Background:

Existing optical adders/subtractors often exhibit varying logic 1 intensity levels across output ports.
This inconsistency poses challenges for cascading optical logic operations.

Purpose of the Study:

To design a compact, single optical structure functioning as both a half-adder and half-subtractor.
To overcome the issue of non-uniform logic 1 intensity levels in optical circuits.

Main Methods:

Development of two distinct structures for half-adder and half-subtractor functionalities.
Integration of these structures into a unified design with a control port.
Utilizing optical simulation to validate performance.

Main Results:

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Last Updated: Sep 29, 2025

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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The proposed structure successfully operates as an optical half-adder when the control port is 0.
The same structure functions as an all-optical half-subtractor when the control port is 1.
Simulation results indicate a rise time of approximately 1.5 ps and an ON/OFF contrast ratio of 18.3 dB.
Crucially, output logic 1 levels were consistent across all ports.

Conclusions:

A novel, compact optical circuit has been demonstrated for combined half-addition and half-subtraction.
The design successfully resolves the issue of non-uniform output intensity levels, enhancing its practicality.
The achieved performance metrics (rise time, contrast ratio) are promising for optical computing applications.