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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...
We demonstrate the inscription of Bragg gratings in the germanium-doped cladding rings of a large-mode-area, ytterbium-doped photonic-bandgap fibre. The gratings are inscribed in these doped rings that can support several modes, the refractive indices of which are derived from experiment and calculated theoretically.
Recent progress in microstructured polymer optical fibre fabrication and characterisation will be presented. A wide range of different optical functionalities can now be obtained by modifications of the microstructure, as is demonstrated by the fibres presented here. Microstructured fibres that are single-mode, highly birefringent or show twin-core coupling are described, in addition to graded-index...
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