The role of rotational alignment during grating writing is comprehensively examined by the measurement of core luminescence from a Ge-doped 12 ring photonic crystal fibre, computer simulation of transmission and, definitively, by inscription of gratings at three angles-0°, 30° and the optimum luminescent angle for this fibre, 21.5°. All experimental results were in accordance with each other and in agreement with simulation. Control of the rotational alignment of the fibre is demonstrably

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... al for reproducible grating writing. © Haxha et al.; Licensee Bentham Open. This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.