Dispersion characteristics of fiber Bragg gratings with Gaussian self apodization made with a femtosecond laser in heavily doped erbium and ytterbium fibers

Robert B. Walker; Dan Grobnic; Ping Lu; Stephen J. Mihailov; Christopher W. Smelser

doi:10.1117/12.778723

26 October 2007 Dispersion characteristics of fiber Bragg gratings with Gaussian self apodization made with a femtosecond laser in heavily doped Erbium and Ytterbium fibers

Robert B. Walker, Dan Grobnic, Ping Lu, Stephen J. Mihailov, Christopher W. Smelser

Author Affiliations +

Proceedings Volume 6796, Photonics North 2007; 679613 (2007) https://doi.org/10.1117/12.778723
Event: Photonics North 2007, 2007, Ottawa, Canada

Abstract

Short fiber lasers are increasingly studied due to their applications in communications and sensing¹. These lasers require high concentrations of Erbium (Er) and Ytterbium (Yb) that are not compatible with the presence of Germanium (Ge) in the fiber core². In stark contrast with more conventional fabrication methods, ultrafast lasers now allow for grating inscription within fibers having no Ge doping³. Normally for short gratings the reflected signal dispersion is small and relatively harmless to the operation of long cavities. As cavity length decreases however the signal will tend to travel more and more within the gratings, interacting with them proportionately more often. Hence a thorough understanding of the grating dispersion characteristics becomes even more important. As a result of their physical differences, the characteristics of ultrafast gratings can vary substantially from those produced using more conventional fabrication methods, and it is unknown whether these factors in combination with a high dopant concentration will significantly affect the dispersion properties of such gratings. In this study, Bragg gratings made with infrared (IR) femtosecond radiation and a first order phase mask were inscribed in fibers heavily doped with Er and Yb as well as a pure silica core fiber. Subsequent measurements of the power spectra, group delay and group delay ripple (GDR) are reported herein.

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Robert B. Walker, Dan Grobnic, Ping Lu, Stephen J. Mihailov, and Christopher W. Smelser "Dispersion characteristics of fiber Bragg gratings with Gaussian self apodization made with a femtosecond laser in heavily doped Erbium and Ytterbium fibers", Proc. SPIE 6796, Photonics North 2007, 679613 (26 October 2007); https://doi.org/10.1117/12.778723

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KEYWORDS

Dispersion

Erbium

Fiber Bragg gratings

Ytterbium

Picosecond phenomena

Ultrafast phenomena

Waveguides

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