In this paper the existence of optimal frequency detuning in the pumping process of the excited state Faraday anomalous dispersion optical filter ESFADOF, also referred as active FADOF.is reported. We measured this detuning and its variation versus cell temperature. Moreover, the dependence of the ESFADOF transmission on the cell temperature and pumping power was also studied experimentally. On the basis of these results, the transmission of rubidium 775.9nm ESFADOF was raised by more than two orders of magnitude under optimized working conditions. q1998 Elsevier Science B.V. All rights reserved.

本文首次对反常色散原子滤光器在斜入射(0～π/ 2) 条件下的透过率、带宽和频移等特性进行了理论研究;本文还进行了斜入射的滤光器透射谱实验研究,与理论分析符合较好;这些为原子滤光器在卫星及空间光通信领域的宽视场角接收方案奠定了基础,该方案有利于空间瞄准及捕捉.

为了克服大气无线光信道中光强闪烁带来的长突发错误, 本文提出了一种基于光子计数的迭代译码方案,并分析基于大气无线光信道下的译码性能. 仿真结果表明,本方案不仅提高了系统的抗突发错误性能,并且与传统的信道交织+ 级连码方案相比,具有不引入信道交织时延和易于硬件实现的优点.

研究一种采用光折变多量子阱器件的无线光通信自差拍接收方案。与寻常相干接收方案相比,省去了中频跟踪电子系统;与量子阱器件零拍方案相比,采用中频窄带滤波器,提高了接收端机的输出信噪比。理论上研究了自差拍相干接收方案,从其物理机制出发,结合信噪比分析,探讨了影响相干接收方案的主要因素。建立了该方案的实验系统,并开展了有意义的实验研究。理论分析及实验结果表明,该方案对激光大气传输所引起的诸多不利影响皆有一定的抑制作用,因而有可能应用于卫星地面激光通信和地面无线光通信系统。

Atmospheric optical wireless channel is a time-varying optical channel because of the effect of scintillation, the paper introduces rate compatible punctured turbo code (RCPTC) scheme to provide unequal error protection (UEP) for optical wireless communication. In order to use RCPTC over optical wireless channel, the paper firstly proposed a turbo decoder with iterative optical channel estimation for optical wireless channel. Simulations show that the proposed turbo decoder significantly improves the performance of system. Based on the proposed turbo decoder, the paper compares several RCPTC schemes via simulations. In these RCPTC schemes, the non-uniformly punctured code schemes are compared with uniformly punctured code scheme. Moreover, the systematic puncturing scheme and non-systematic puncturing scheme are both discussed.