4. Conclusion

We have reported a numerical analysis of the temperature effects in tapered ytterbium and thulium-doped fiber amplifiers in co-propagation mode. We found that the tapering shape and the pump power at the input amplifier modify

Temperature Sensing Characteristics of Tapered Doped Fiber Amplifiers DOI: http://dx.doi.org/10.5772/intechopen.89894

significantly its temperature sensitivity. In particular, the temperature sensitivity is higher as the core radius is reduced in the propagation direction (Taper 1 scheme), and it can be maximized if the tapered fiber length is equal to the propagation distance where the cross-point of the power conversion is achieved. On the other hand, the temperature sensitivity can also be incremented if we use lower pump powers at the amplifier input. Then, for temperature sensing applications, it is desirable to work using tapered doped fiber amplifiers in low pump power regimes. Our results can be extrapolated to other doped fibers and are of great interest for the improvement of high-power tapered lasers and the development of temperature fiber laser sensors.
