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Related Experiment Video

Updated: May 7, 2026

Writing Bragg Gratings in Multicore Fibers
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Twisted Fiber Bragg Gratings as a Polarization-Insensitive Element.

Oleg V Butov1,2, Alexey I Lopunov1,2, Ivan Ulyanov3

  • 1Kotelnikov Institute of Radioengineering and Electronics of RAS, Moscow 125009, Russia.

Sensors (Basel, Switzerland)
|January 10, 2026
PubMed
Summary

This study introduces a novel method for creating Bragg gratings in pre-twisted optical fibers using femtosecond lasers. This technique significantly reduces polarization dependence, enhancing performance for high-precision fiber Bragg grating sensors.

Keywords:
femtosecond inscriptionfiber bragg gratingspoint-by-point techniquepolarization dependencetwisted fiber

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science

Background:

  • Fiber Bragg gratings (FBGs) are crucial optical components.
  • Polarization dependence limits the precision of FBG sensors.
  • Current fabrication methods often result in polarization-sensitive gratings.

Purpose of the Study:

  • To develop an original method for fabricating Bragg gratings with minimized polarization dependence.
  • To investigate the effectiveness of inscribing Bragg structures in pre-twisted optical fibers.
  • To enhance the performance of FBGs for high-precision sensing applications.

Main Methods:

  • Utilized the point-by-point fabrication technique.
  • Employed femtosecond laser radiation for inscription.
  • Introduced a pre-twisted optical fiber structure to embed the Bragg grating.

Main Results:

  • Demonstrated a significant reduction in the polarization dependence of Bragg gratings.
  • The polarization dependence of the reflection level decreased by at least an order of magnitude.
  • The polarization dependence of the Bragg wavelength decreased by three times compared to straight FBGs.

Conclusions:

  • The proposed method effectively minimizes polarization dependence in Bragg gratings.
  • Pre-twisted fiber Bragg gratings offer improved stability and accuracy.
  • This technique is suitable for producing high-precision Bragg sensors for various applications.