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Updated: Jun 17, 2026

Writing Bragg Gratings in Multicore Fibers
08:48

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

Tunable delay slow-light in an active fiber Bragg grating.

Kai Qian1, Li Zhan, Honggen Li

  • 1Department of Physics, State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai, China.

Optics Express
|December 10, 2009
PubMed
Summary

Researchers demonstrated a simple slow-light technique using Er/Yb codoped fiber Bragg gratings (FBGs) to tune optical delay. Changing pump power controllably adjusted the group delay, slowing light to 19% of its free-space speed.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science

Background:

  • Slow light phenomena are crucial for optical signal processing and delay applications.
  • Fiber Bragg gratings (FBGs) offer a versatile platform for manipulating light propagation.

Purpose of the Study:

  • To propose and experimentally demonstrate a simple, tunable slow-light technique for achieving optical delay.
  • To investigate the use of Er/Yb codoped FBGs for controllable light delay.

Main Methods:

  • Utilizing the strong dispersion at the reflection edge of an Er/Yb codoped FBG.
  • Modulating the signal wavelength and pump power to control group delay.

Main Results:

  • Achieved a controllable optical delay of 0.9 ns by adjusting the 980 nm pump power.

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Last Updated: Jun 17, 2026

Writing Bragg Gratings in Multicore Fibers
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Published on: April 20, 2016

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

  • Slowed the group velocity of light to 5.6x10^7 m/s (19% of c).
  • Demonstrated a tunable slow-light effect based on pump power variation.

    • Conclusions:

    • The proposed method offers a simple and feasible approach for tunable optical delay.
    • The technique has potential implications for practical applications in optical communications and signal processing.