Optical amplification of Eu(DBM)_3Phen-doped polymer optical fiber

Abstract

A preform technique is used to prepare a step-index (SI) polymer optical fiber (POF) doped with $\mathrm{Eu}{\left(\mathrm{DBM}\right)}_3\mathrm{Phen}$. The gain (5.7 dB) at 613 nm of the doped SI POF with ${\mathrm{Eu}}^{3+}$ content of 4000 in ${10}^6$ wt., 0.4-mm core diameter, and 30-cm fiber length is observed at ambient temperature by end pumping with a YAG at 355 nm. The input signal light is $\sim 0.2 \mathrm{W}$. The results show the possibility of signal gain in a rare-earth-doped POF amplifier and the potential of a polymer doped with rare-earth ions as an active optical device.