We show theoretically that the fiber-optic devices using single-multi-single mode fiber structures can be made temperature insensitive by properly adjusting the concentration of P2O5 in the core region of the multimode fiber used. Taking an example of a parabolic index multimode fiber, we obtain the temperature-insensitive transmission spectrum and fiber-optic lens action for a core composition of 1.57 mol. % P2O5 and 13.5 mol. % GeO2 in the SiO2 host. (C) 2012 Optical Society of America
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