多模光纤产生用于大气光通信的部分相干光源
Employing multi-mode fiber to form partially coherent light source for atmospheric optical communication
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摘要: 克服大气湍流对近地大气光通信质量影响，可归结为在接收端的照明均匀化，而采用部分相干光照明则是提高照明均匀性的一种有效途径。提出利用多模光纤的模间色散产生一个具有部分相干光特性的合成光源的方法，分析了该光源的产生原理，表明光束发散角由光纤芯径和发射透镜的焦距决定，由模间色散产生的光程差越大，该合成光源的空间相干性越差。仿真结果表明形成1 mrad远场发散角的合成光源是可行的，因而适于在空间光通信中应用。Abstract: Improving illumination uniformity is one of the most important steps to restrain the influence of the atmospheric turbulence on free-space optical communication. Furthermore, partially coherent light source could be used to produce relative uniform illumination. In this paper an optical structure which takes advantage of the inter-mode dispersion of multimode fiber is proposed to produce a synthetic partly coherent light source. The principle is analyzed and a computer simulation is employed to demonstrate the feasibility. It is indicated that beam divergence angle is determined by fiber diameter and focus of lens. The simulated result shows that the spatial coherence of the synthetic light source decreases as the total optical path difference is increased and a synthetic source with 1mra
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