EDFA中继长距离共驱半导体激光器混沌同步研究

EDFA-Relaying Long-Haul Chaos Synchronization of Semiconductor Lasers Driven by a Common Signal

该文数值研究了基于EDFA中继和周期色散补偿的长距离共驱半导体激光器混沌同步方案。通过优化驱动光注入条件及激光器弛豫频率失配,实现了同步系数0.98的响应激光器背靠背同步,同时将驱动与响应的相关性降低至0.32,保障了共驱同步安全性。进一步,考虑光纤色散、非线性效应以及EDFA噪声等损伤因素,数值研究了入纤光功率、单跨段光纤长度的最优条件。预期在每百公里光纤链路中色散补偿偏差为5 ps/nm的情况下,可以实现700 km、同步系数0.90的高质量混沌同步。研究结果对长距离混沌激光载波通信及密钥分发具有参考意义。

This paper numerically studies the long-haul chaotic synchronization scheme of semiconductor lasers driven by a common signal based on erbium-doped fiber amplifier(EDFA)relay and periodic dispersion compensation.By optimizing the injection conditions of the driving light and the mismatch of the relaxation oscillation frequency between driving and response lasers,the response laser achieves synchronization with a synchronization coefficient of 0.98 in back-to-back situations.At the same time,the correlation between the driving and response lasers is reduced to 0.32,ensuring the security of the co-drive synchronization system.Furthermore,considering the damage factors such as fiber dispersion,nonlinear effects,and EDFA noise,the optimal conditions for fiber input power and single-span fiber length are numerically studied.It is expected that under the condition of dispersion compensation deviation of 5 ps/nm per 100 km fiber,a high-quality chaotic synchronization with a synchronization coefficient of 0.90 can be achieved after 700 km of fiber transmission.This research result has reference significance for long-distance chaotic laser carrier communication and key distribution.