通过构建一个双光反馈半导体激光混沌系统，本文实验研究了双腔之间不同反馈强度对系统混沌输出的延时特征的影响.结果表明：固定一个腔的反馈量，而适当调节另一个腔的反馈强度，可实现对混沌输出延时特征的良好抑制.同时，在延时反馈特征抑制较好的情况下，还存在时间漂移（即从混沌输出所提取的特征延时与系统真实延时之差）明显增大的现象.因此采用双光反馈半导体系统可以很好地隐藏激光混沌的延时参量，从而显著提升其在相关领域的表现性能.

Through constructing a double optical feedback semiconductor laser chaotic system, the time delay signatures of chaos are investigated experimentally under different working conditions. The results show that, time delay signatures of chaotic output can be suppressed efficiently through adjusting the feedback strength of one cavity carefully and fixing the feedback strength of another cavity. Meantime, there is a big time shift which is the deviation between extracted delay time and real system delay time. Therefore, double optical feedback semiconductor laser chaotic system can efficiently hide the delay time signature of chaotic laser output, and also improve the performance in related application fields.