量子密钥分发是一种能够提供物理上安全的密钥分发方式,如今已成为信息安全领域的热 门研究学科,但在量子密钥分发中其成码速度的限制影响了它的实际应用性。提高LD驱动脉 冲调制速度,可以有效地提高信号发射速度,加快量子密钥分发的成码速率。采用循环驱动的 方法,在时钟频率200 MHz的条件下,基于FPGA实现了200 MHz的脉冲调制速度。实验结果显示, 采用该方案产生触发脉冲驱动LD, 输出量子信号的抖动小于2 ns,满足了量子密钥分发的要求。

Quantum key distribution (QKD) is a research topic of information security area. It can provide physical security key distribution. However, the low key rate of QKD limits its practical appliance. The increasement of the speed of LD driver pulse modulation effectively improves signal rate, to expedite the key generation rate of quantum key distribution. Modulation rate of 200 MHz can be achieved based on FPGA at 200 MHz clock frequency. Experiment results show that the jitter of the output quantum signal is less than 2 ns when using the scheme to generate trigger pulse to driving LD, which meets the requirements of quantum key distribution.