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Writing Bragg Gratings in Multicore Fibers
Published on: April 20, 2016
Fiber Bragg reflectors prepared by a single excimer pulse
Optics Letters
|October 2, 2009
Summary
Researchers created permanent Bragg gratings in germanium-doped silica optical fibers using a KrF excimer laser. This method achieved high reflectance gratings with narrow linewidths, suitable for optical fiber applications.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
Background:
- Optical fiber Bragg gratings are crucial for various photonic applications.
- Developing efficient and permanent grating fabrication methods is an ongoing challenge.
Purpose of the Study:
- To demonstrate the fabrication of narrow-line, permanent Bragg reflection gratings in Ge-doped silica-core optical fibers.
- To characterize the properties of these laser-induced gratings.
Main Methods:
- Utilizing a single 20-nanosecond pulse of KrF excimer laser light.
- Interfering laser beams within the Ge-doped silica-core optical fiber to induce gratings.
- Characterizing grating reflectance and linewidth (Full Width at Half Maximum - FWHM).
Main Results:
- Successfully created narrow-line, permanent Bragg gratings.
- Achieved a maximum reflectance of approximately 2% with a linewidth of 0.1 nm.
- Observed an index modulation of approximately 3 x 10^-5 for a 2-mm grating length.
Conclusions:
- The KrF excimer laser interference method is effective for fabricating high-quality Bragg gratings in Ge-doped silica fibers.
- The achieved grating parameters demonstrate potential for advanced optical sensing and filtering applications.
