PbSe quantum dot (QD,in 4.4-nm diameter) doped fibers are prepared with a solid fiber core of UV gel,in doping concentration from 0.1 mg/mL to 6.0 mg/mL,and with different fiber lengths.By measuring the absorption spectra of QD doped fibers,the absorption cross-section of 980 nm varying with the doping concentration and the fiber length is determined.Measuring photoluminescence (PL) spectra of the doped fibers show that the PL-peak intensity varies with both the doping concentration and fiber length.Thus,there is an advisable doping concentration and fiber length corresponding to the maximum PL intensity.The results presented in this paper provide a support for development of PbSe-QD doped fiber amplifiers and lasers in the future.