基于偏振信息恢复的光通信

基于斯托克斯矢量和MC算法，在各种散射系统中研究了偏振信息的传输性能。根据偏振光斯托克斯矢量的散射特性，提出了一种能够减少散射对入射偏振光影响的PR方法。为了验证PR方法的有效性和实用性，仿真了在不同实际大气和水下环境，偏振传输和偏振信息恢复的结果。仿真结果表明，PR方法更适用于粒子半径相对大的杂乱媒介，并且长波可以有效地减少偏振信息的损失。此外，仿真结果也表明，在非均匀的大气媒介中下行和上行链路是不可逆的。在水下，PR方法同样用来减小散射对于光的偏振度的影响。通过PR方法，线偏振度的最大增强可达到16%。这些结果对于未来大气，水下量子保密通信具有重要的意义。

Retrieving the polarization information for light communication

The transmission performances of polarization information in various scattering systems were introduced based on Stokes vectors and Monte Carlo(MC) simulation algorithm. According to the Stokes vectors' scattering characteristics of polarized light, the polarization retrieve(PR) method was proposed theoretically, which is aiming at reducing the scattering impact on incident polarized light and increasing the transmission efficiency of light signals. In order to prove the availability and practicability of PR method, simulations on the polarization transmission and reconstruction in atmosphere and underwater, were complemented in different actual environmental circumstances. The results demonstrate that the PR method is more applicable to disordered media with relatively larger particles and the longer wavelengths can reduce the loss of polarization information effectively. Furthermore, the simulated results reveal that the downlink and uplink are not exchangeable in an inhomogeneous atmospheric medium. In underwater, the PR method is also used to reduce the scattering impacts on the degree of polarization(DoP) of the light, and the maximal enhancement of the degree of linear polarization(DoLP) can reach to about 16% by PR method. These results are significant to the quantum secure communication in atmosphere and underwater in future.