提出了一个利用混沌激光源产生1Gbit/s的随机序列作为扩频码的方案.理论分析表明,该随机序列克服了伪随机序列的周期性,在扩大扩频码容量的同时实现了扩频码可变,提高了通信安全性.利用Simulink软件对该扩频系统进行仿真.结果表明,当信息速率一定时,扩频增益越大,误码率越低,与理论结果相符.与传统的扩频系统相比,该方案在提高系统抗干扰能力的同时也增强了保密性. A scheme of using chaotic laser source to generate 1Gbit / s random sequence as spreading code is proposed.The theoretical analysis shows that the random sequence overcomes the periodicity of the pseudo-random sequence and achieves the spreading code The results show that when the information rate is constant, the larger the gain of spreading, the lower the bit error rate is, which is consistent with the theoretical result.Compared with the traditional spread spectrum Compared with the frequency system, the scheme enhances the system anti-interference ability as well as enhances the confidentiality.