In this Letter, the optical amplification characteristics of the home-made Bi/P co-doped silica fiber were systematically explored in the range of 1270–1360 nm. The maximum gain of 24.6 dB was obtained in the single-pass amplification device, and then improved to 38.3 dB in the double-pass amplification device for -30dBm signal power. In addition, we simultaneously investigated the laser performance of the fiber with the linear cavity. A slope efficiency of 16.4% at ∼1313nm was obtained with a maximum output power of about 133 mW under the input pump power of 869 mW at 1240 nm. As far as we know, it is the first laser reported based on the bismuth-doped fiber in China.

采用万能拉力试验机测试了不同预制棒预处理工艺、拉丝速度及在线主动控温退火工艺下单模石英光纤的平均拉断力。采用反射式光学显微镜、扫描电子显微镜表征了不同条件下光纤预制棒及光纤表面微观形貌，分析研究了光纤拉断力的影响因素。结果表明：随着拉丝速度逐渐增加，光纤平均拉断力呈下降趋势；通过对预制棒进行火焰抛光与梯度降温处理，优化主动控温退火工艺同时降低拉丝速度，光纤平均拉断力由无任何处理的36.69 N增长到68.28 N，拉断力提高了86%。

We fabricate a high-performance Bi/Er/La co-doped silica fiber with a fluorescence intensity of -33.8dBm and a gain coefficient of 1.9 dB/m. With the utilization of the fiber as a gain medium, a linear-cavity fiber laser has been constructed, which exhibits a signal-to-noise ratio of 74.9 dB at 1596 nm. It has been demonstrated that the fiber laser has a maximum output power of 107.4 mW, a slope efficiency of up to 17.0%, and a linewidth of less than 0.02 nm. Moreover, an all-fiber single-stage optical amplifier is built up for laser amplification, by which the amplified laser power is up to 410.0 mW with pump efficiency of 33.8%. The results indicate that the laser is capable of high signal-to-noise ratio and narrow linewidth, with potential applications for optical fiber sensing, biomedicine, precision measurement, and the pump source of the mid-infrared fiber lasers.