研究了由低掺杂浓度的分布式掺铒光纤级联传输系统中，多个暗孤子组成的暗孤子链的传输特性，结果表明：在分布放大传输中，奇或偶数个暗孤子组成的暗孤子链的传输特性存在较大的差异．其中奇数个暗孤子组成的暗孤子链的传输稳定性较好；而偶数个暗孤子组成的暗孤子链在传输过程中存在明显的由暗孤子相互作用引起的孤子自频率漂移和孤子变形． The transmission characteristics of dark soliton chains composed of many dark solitons in a distributed erbium-doped optical fiber cascaded transmission system with low doping concentration were studied. The results show that the dark orphan dark solitons The soliton chain transmission characteristics are quite different. The dark soliton chain composed of odd dark solitons has better transport stability, while the dark soliton chain composed of even dark solitons has obvious soliton self-frequency drift and soliton deformation caused by dark soliton interaction.