Bragg gratings in the germanium-doped concentric rings of a Yb <sup>3+</sup>-doped core solid photonic bandgap fiber

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Journal Article
IEEE Sensors Journal, 2012, 12 (1), pp. 103 - 106
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The inscription of Bragg gratings into the germanium-phosphorous co-doped rings of a photonic bandgap fiber with a ytterbium-doped core is reported. These cladding layers are observed to exhibit interesting modal properties, with each ring supporting near-degenerate modes that agree well with numerical modeling. Besides fiber laser applications, there are several potential sensing applications of gratings in such a fiber. © 2006 IEEE.
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