An optical multimode fiber as pseudothermal light source
  We report on a novel pseudothermal light source based on laser light coupled into an optical multimode fiber. The setup is simple, of low cost, exhibits inherently high directional light emission and allows for a flexible arrangement. By measuring the photon statistics and spatial two point intensity correlations in the far field we show that the setup exhibits all characteristics of a gaussian random source. 
Thomas Mehringer, Steffen Oppel, Joachim von Zanthier
quant-ph physics.optics