Rotationally Variant Grating Writing in Photonic Crystal Fibres

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 experi- mental results were in accordance with each other and in agreement with simulation. Control of the rotational alignment of the fibre is demonstrably critical for reproducible grating writing.

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