Abstract
We present the development of a large core multimode photonic crystal fibre with hyperspectral transmission that covers the visible, near and (in part) mid infra-red wavelength ranges (400-6500 nm). We have optimised the composition of a heavy metal-oxide glass based on the PbO-Bi<sub>2</sub>O<sub>3</sub>-Ga<sub>2</sub>O<sub>3</sub> system modified with Nb<sub>2</sub>O<sub>5</sub>, Ta<sub>2</sub>O<sub>5</sub>, SiO<sub>2</sub>, GeO<sub>2</sub>, BaO, CdO, Na<sub>2</sub>O and K<sub>2</sub>O. The optimised glass shows good transmission up to 6 μm as well as good rheological properties that permits multiple thermal processing steps in an optical drawing tower without crystallisation. The selected glass is synthesized inhouse and has been used for fibre development. We have fabricated a multi-mode photonic crystal fibre with an effective mode area of 295 μm<sup>2</sup>. The photonic cladding is composed of 8 rings of air holes with a fill factor of 0.46. The transmission of a hyperspectral spectrum is experimentally verified using a broadband source. The attenuation of the fibre and its sensitivity to bending losses is presented.
Published Version
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