Spectral properties and role of aluminiumrelated bismuth active centre (BAC-Al) in bismuth and erbium co-doped fibres

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Journal Article
Optical Materials Express, 2015, 5 (5), pp. 1195 - 1209
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© 2015 Optical Society of America. Bismuth and erbium co-doped silicate fibres (BEDFs) and their potential for ultra-broadband applications are closely associated with the characteristics of defect sites ascribed to bismuth active centres (BACs). This work focusses on the absorption, emission, excited state absorption (ESA) and up-conversion characteristics of an aluminium (Al) related bismuth active centre (labelled as BAC-Al) in the BEDFs. The absorption and emission bands of BAC-Al are measured centred at ~1050 nm and ~1100 nm respectively, consistent with those previously ascribed in BDFs. We observed broad ESA over (920-1320) nm or (920-1500) nm in BEDFs under 830 nm pumping and found these to be linked to BAC-Al. The observed ESA consists of several individual ESA bands with the strongest ESA band centred at 1030 nm. The 1030 nm ESA band originates from the energy level emitting at 1100 nm of the BAC-Al and affects the 1100 nm emission significantly. The 1100 nm emission energy level of BAC-Al was found to be directly associated with ESA at 830 nm that leads to an upconversion at 532 nm. With these findings we assess the role of Al or BACAl in BEDFs and discuss the improved design and operation of BEDFs for broadband applications.
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