Research on Active Polarization Control System of Fiber Laser Based on a Mixed Genetic Algorithm and Simulated Annealing Algorithm

Yang, 尤阳 You; Yunfeng, 漆云凤 Qi; Hui, 沈辉 Shen; Xingxing, 邹星星 Zou; Bing, 何兵 He; Jun, 周军 Zhou

doi:10.3788/aos202040.2314002

Cited by 3 publications

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“…为了进一步推动CV-QKD系统从实验室环境走向实际外场应用, 引入光纤链路中的动态偏振控制技术, 同时此技术也被广泛应用于光通信领域. 光纤链路中偏振态实时跟踪和控制单元, 利用动态偏振控制器响应速度快, 无迟滞效应, 插入损耗小的特点, 基于现场可编程逻辑门阵列 (fieldprogrammable gate array, FPGA) 硬件, 结合梯度算法 (gradient algorithm, GA) [19,20] 、多步长模拟退火算法 (simulated annealing algorithm, SA) [21,22] 、遗传算法 (genetic algorithm, GA) [23] 、粒子群算法 (particle swarm optimization, PSO) [24] 以及差分进化 (differential evolution, DE) 和GA相结合算法 [25] 等, 加入外围电路, 同时考虑庞加莱球盲区问题 [26] , 实现实时跟踪和控制偏振态. 电控挤压型偏振控制器的响应速度一般在几十微秒, 为了提高反馈效率, 可以采用铌酸锂型的偏振控制器, 响应速度在百纳秒, 但其插入损耗高于电控挤压型偏振控制器, 跟踪和控制偏振态变化速率的快慢, 取决于偏振控制器件的响应速度和算法收敛性.…”

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Research on dynamic polarization control in continuous variable quantum key distribution systems

Zhang,

Bai,

Jie

et al. 2024

Acta Phys. Sin.

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In a commercial fiber-based quantum key distribution system, the local and signal optical fields are transmitted through long distance fibers using time division multiplexing and polarization multiplexing. The state of polarization of the optical fields is inevitably disturbed by random birefringence of the standard single-mode fiber caused by external complex environments. This drift of the state of polarization significantly affects the balanced homodyne detection results and the secret key rate. Therefore, the key technology of the dynamic polarization control unit is crucial for the system on a large-scale commercial application. We theoretically analyze and prove that the polarization control unit only requires a combination of two degrees of freedom when considering the outcomes of an arbitrary polarization extinction ratio at the system receiver. To overcome the influence of polarization variations, we propose a chaotic monkey algorithm based on Bayesian parameter estimation method and implement intelligence algorithm on field programmable gate array (FPGA) hardware under pulsed light with an integral type detector for the dynamic polarization control unit. The simulative results indicate that the optimal combination is four degrees of freedom and the optimal prior distribution is an exponential distribution among the other kinds of distributions in the dynamic polarization control unit. According to the simulative results, the experimental results show that the achieved polarization extinction ratio is over 30 dB and the average time of polarization control is 400 μs for a single random polarization scrambling. By combining the dynamic polarization control unit with the system, we demonstrated continuous variable quantum key distribution (CV-QKD) under a continuous polarization scrambling scope of 0~2 krad/s and verified its validity. In addition, the methods presented will improve the performance of the system and expand the range of applications even under strong external disturbance.

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Research on dynamic polarization control in continuous variable quantum key distribution systems

Zhang,

Bai,

Jie

et al. 2024

Acta Phys. Sin.

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Theoretical Analysis on Active Polarization Control of Fiber Laser Based on Root Mean Square Propagation Algorithm

Shi,

Qi,

Shen

et al. 2024

Applied Sciences

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High-power linearly polarized fiber lasers are widely used in coherent beam combination, nonlinear frequency conversion, and gravitational wave detection. With the increase in output power, it is challenging for fiber lasers to maintain a high polarization extinction ratio (PER). Combined with intelligent techniques, active polarization control is a prospective method to obtain the laser output with high PER and high stability. We demonstrate a comprehensive model of an active polarization control system. The root mean square propagation (RMS-Prop) algorithm is used to control the non-polarization-maintaining (non-PM) fiber laser to generate linearly polarized laser. The parameters of the RMS-Prop algorithm are theoretically analyzed, including cost function, perturbation amplitude, and global learning rate. The simulation results show that PER is the optimal cost function. When the perturbation amplitude is 0.06 and the global learning rate is 0.6, the system can achieve the optimal control speed and accuracy. By comparison with the stochastic parallel gradient descent (SPGD) algorithm, the RMS-Prop algorithm has an advantage in obtaining higher PER.

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基于fpga的量子通信系统偏振态制备及控制集成化

Zhang Yingqiang,

Cheng Ziyu,

Li Haizhen

et al. 2023

激光与光电子学进展

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Research on Active Polarization Control System of Fiber Laser Based on a Mixed Genetic Algorithm and Simulated Annealing Algorithm

Cited by 3 publications

References 0 publications

Research on dynamic polarization control in continuous variable quantum key distribution systems

Research on dynamic polarization control in continuous variable quantum key distribution systems

Theoretical Analysis on Active Polarization Control of Fiber Laser Based on Root Mean Square Propagation Algorithm

基于fpga的量子通信系统偏振态制备及控制集成化

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