An efficient and straightforward method to obtain all-fiber pulsed sources at 2 μm is presented and experimentally demonstrated. It is based on the soliton self-frequency shift effect in a highly nonlinear fiber. The output power of a supercontinuum source is previously increased by an optimized homemade thulium-doped fiber amplifier. By coupling the amplified output power in a highly nonlinear fiber, the spectrum is shifted toward 130 nm and the spectral peak is located at 2014 nm. The power conversion factor reaches values as high as 0.93, without employing additional amplifiers. The mean spectral power of the 2 μm source reaches -4.6 dBm/nm (0.35 mW/nm), its output power is 38 mW and the peak power of each pulse is higher than 27 kW.

Este trabajo estudia el comportamiento de resistencias integradas en tecnología CMOS en un rango de temperaturas que abarca de temperatura ambiente hasta ultra-baja temperatura (4 K). Se demuestra que el coeficiente de temperatura α no puede ser aproximado de forma lineal aun cumpliendo la condición de aproximación (αΔT<<1) para temperaturas criogénicas.