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Related Experiment Video

Updated: Jul 2, 2026

Writing Bragg Gratings in Multicore Fibers

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

Double groove broadband gratings.

Juha Pietarinen¹, Tuomas Vallius

¹Department of Physics and Mathematics, University of Joensuu, Joensuu, Finland. juha.pietarinen@nanocomp.fi

|September 6, 2008

Summary

This study uses wavelength-scale periodic structures for diffractive optics to broaden spectral bands. It leverages effective refractive index variations to counteract the efficiency drop of diffraction gratings with changing wavelengths.

Area of Science:

Optics and Photonics
Materials Science

Background:

Diffractive optics exhibit strong wavelength dependence, limiting their functional spectral band.
Periodic structures at the wavelength scale offer potential for enhancing optical device performance.

Purpose of the Study:

To increase the functional spectral band of diffractive optics.
To compensate for the inherent wavelength dependence of diffraction grating efficiency.

Main Methods:

Implementing waveguiding in wavelength-scale periodic structures.
Utilizing the deviation of effective refractive index between waveguides as a function of wavelength.

Main Results:

Successfully broadened the functional spectral band of diffractive optics.

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Demonstrated compensation for the strong wavelength dependence of diffraction grating efficiency.

Conclusions:

Waveguiding in wavelength-scale periodic structures is an effective method to enhance the spectral performance of diffractive optics.
Effective refractive index engineering in these structures provides a pathway to overcome limitations in diffraction grating efficiency across a wider spectrum.