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Updated: Mar 9, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

Broadband optical waveguide couplers with arbitrary coupling ratios designed using a genetic algorithm.

Po-Han Fu, Yi-Chou Tu, Ding-Wei Huang

|January 7, 2017

Summary

This summary is machine-generated.

This study introduces a novel silicon-on-insulator optical waveguide coupler design. Optimized using a genetic algorithm, it achieves broadband performance with arbitrary coupling ratios.

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Area of Science:

Photonics
Integrated Optics
Materials Science

Background:

Optical waveguide couplers are fundamental components in integrated photonic circuits.
Achieving arbitrary coupling ratios and broadband operation simultaneously presents a design challenge.

Purpose of the Study:

To develop a generalized design methodology for broadband optical waveguide couplers.
To enable arbitrary coupling ratios on the silicon-on-insulator (SOI) platform.

Main Methods:

A segmented device design approach was employed, dividing the coupler into 34 sections.
Propagation constants and coupling coefficients of each section were optimized using a genetic algorithm.

Main Results:

The optimized design achieved superior performance compared to existing methods with fewer design variables.
Couplers with 75%/25%, 50%/50%, 25%/75%, and 0%/100% ratios were realized with device lengths of 34 μm.
A ±2% bandwidth exceeding 100 nm was demonstrated at a central wavelength of 1580 nm.

Conclusions:

The proposed generalized design offers an efficient and flexible approach for creating broadband optical waveguide couplers.
This method provides a significant advancement for silicon-on-insulator photonic integrated circuits.