基于高浓度掺铒光纤的平坦宽带光源设计

Flattening broadband source with high concentration Er-doped fiber

为了实现高平坦的自发辐射输出,提出并设计了一种基于974nm泵浦源和高掺杂浓度掺铒光纤的平坦宽带光源。系统以泵浦波长974nm的激光二极管作为泵浦源,先将泵浦光分为两路对掺铒光纤分级泵浦,再将铒离子产生的自发辐射光合并输出,并调节铒纤长度和泵浦功率对输出光谱进行优化。仿真结果表明:泵浦功率为160mW,两段掺铒光纤长度分别为7m和2m时,可以在1530~1610nm得到带宽为80nm,功率为20.348mW,平坦度为±1.268dB的光谱输出。该系统在不额外增加滤波器且光纤总长小于10m的前提下,实现平坦宽带输出,有望在光纤传感系统中得到应用。

In order to achieve high and flatting spontaneous radiation output, a flatting broadband light source based on 974nm pump source and Er-doped fiber with high doping density is proposed and designed. Firstly, the pump light is divided into two parts to pump Er-doped fibers. Then, the two parts of light are combined and output by wavelength division multiplexing. Finally, adjusting the length of Er-doped fiber and pump power to optimizing the output spectra. According to the result in simulation, when the pump power is 160mW, the length of Er-doped fibers are 7m and 2m, the spectra with output power of 20.348mW and bandwidth of 80nm can be obtained from 1530nm to 1610nm. The flatness of spectra from 1530nm to 1610nm is ±1.268dB. The system can output flatting wide spectra without adding filters and the length of Er-doped fiber less than 10m, which is expected to be used in optical fiber sensing system.