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The special features of photonic crystal fibres (PCFs) are achieved by their air hole structures. PCF structure is determined and formed by its origin preform design and drawing process. Therefore, structure formation dynamics in drawing PCF is important for the fabrication of PCF achieving desirable structure and thus the intended feature. This paper will investigate structure formation dynamics of PCF drawing in relation to key parameters and conditions, such as hole dimension, temperature, pressure, etc.

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Spun Hi-Bi bismuth/erbium co-doped photonic optical fibre (SHB-BEPCF) has been fabricated using preform stacking and draw tower self-pressurization. Results demonstrate broadband and partially elliptical polarized NIR emission under un-polarized 830 nm pumping spanning ~ 520 nm centred at 1430 nm.