A thermal ghost imaging scheme between two distant parties is proposed and experimentally demonstrated over long-distance optical fibers. In the scheme, the weak thermal light is split into two paths. Photons in one path are spatially diffused according to their frequencies by a spatial dispersion component, then illuminate the object and record its spatial transmission information. Photons in the other path are temporally diffused by a temporal dispersion component. By the coincidence measurement between photons of two paths, the object can be imaged in a way of ghost imaging, based on the frequency correlation between photons in the two paths. In the experiment, the weak thermal light source is prepared by the spontaneous four-wave mixing in a silicon waveguide. The temporal dispersion is introduced by single-mode fibers of 50 km, which also could be looked at as a fiber link. Experimental results show that this scheme can be realized over long-distance optical fibers.

中文翻译：

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光纤上的远距离热时间重影成像

提出了两个远方之间的热幻影成像方案，并在长距离光纤上进行了实验证明。在该方案中，弱热光被分成两条路径。一个路径中的光子根据其频率由空间色散分量在空间上扩散，然后照亮对象并记录其空间透射信息。另一条路径中的光子通过时间色散分量在时间上扩散。通过两条路径的光子之间的重合测量，可以基于两条路径中的光子之间的频率相关性，以重影成像的方式对物体进行成像。在实验中，通过在硅波导中自发的四波混合来制备弱热光源。时间色散是由50 km的单模光纤引入的，这也可以看作是光纤链路。实验结果表明，该方案可以在长距离光纤上实现。