基于光纤环形镜的C+L波段高 平坦高功率掺铒光源

研究并设计了一种用3 dB宽带耦合器制作的光纤环形镜作为反射镜的双级双程单管抽运高平坦度高功率C+L波段ASE光源。用2个980 nm激光二极管调试两级抽运光功率的分配,两级采用掺铒浓度不同的光纤并优化光纤长度,获得了功率高达15.28 mW(11.84 dB/m)的C＋L波段ASE光输出,平均波长为1 559.31 nm,在未采用任何外加滤波器的情况下,其平坦区域3 dB带宽66.72 nm(从1 533.12 nm至1 599.84 nm)。之后采用一个激光二极管实现两级双向同时抽运得到了同样的效果。通过光纤环形镜的使用,不仅提高了抽运源利用效率,且改善了光源的平坦度,在实验过程中,在平坦度相度相对要差一些的条件下,还通过调整两级抽运光的功率及分配比例得到了功率达到30.11 mW的C+L 波段ASE输出。

High power, high flattening C+L band erbium-doped fiber source based on fiber loop mirror

A fiber loop mirror that is made from 3 dB coupler is employed in dual-stage double-pass one pumping LD configuration, in order to realized high flattening C+L band ASE with high output power. By using two 980 nm LDS, ratio of two stage is acquired, Through optimization of parameter of fiber of the two stage, output ASE of C+L band with power of 15.28 mW(11.84 dB/m) is achieved, and mean wavelength is 1 559.31 nm, without any external spectral filter, power ripple of 3 dB is (66.72) nm (from 1 533.12 to 1 599.84 nm). Fiber loop mirror was used as reflector in the configuration, to enhance the efficiency of LD and improve flatness of spectrum, From the experiment,the best ultra bandwidth ASE source with high output power of 30.11 mW is acquired by adjusting the bi-directional pump power of LDs, besides low demands for flatness.