Tetrahedral-Cr Enhancement Employing Dielectric Coating for Higher Gain of Broadband Cr-Doped Fiber Amplifiers

We report gross gain of 8.4-dB for 300-nm broadband single-mode Cr-doped crystalline core fiber (SMCCDF) employing dielectric coating, thermal annealing, and polarization pumping techniques. This gross gain is the highest yet demonstrated of the SMCDCCFs.