Borah Deva K, Voelz David G
Klipsch School of Electrical and Computer Engineering, New Mexico State University, Las Cruces, NM 88003, USA.
Opt Express. 2010 Sep 27;18(20):20746-58. doi: 10.1364/OE.18.020746.
The problem of coherence length optimization in a spatially partially coherent beam for free space optical communication is investigated. The weak turbulence regime is considered. An expression for the scintillation index in a series form is derived and conditions for obtaining improvement in outage probability through optimization in the coherence length of the beam are described. A numerical test for confirming performance improvement due to coherence length optimization is proposed. The effects of different parameters, including the phase front radius of curvature, transmission distance, wavelength and beamwidth are studied. The results show that, for smaller distances and larger beamwidths, improvements in outage probability of several orders of magnitude can be achieved by using partially coherent beams.
研究了用于自由空间光通信的空间部分相干光束中的相干长度优化问题。考虑了弱湍流状态。推导了闪烁指数的级数形式表达式，并描述了通过优化光束相干长度来提高中断概率的条件。提出了用于确认相干长度优化导致性能提升的数值测试。研究了包括相位前曲率半径、传输距离、波长和光束宽度在内的不同参数的影响。结果表明，对于较小的距离和较大的光束宽度，使用部分相干光束可使中断概率提高几个数量级。
