Frequency dependence of modal noise in multimode optical fibers

摘要: Under certain conditions a changing speckle pattern exists at the output plane of multimode fiber, resulting in modal noise which can degrade error performance fiber data link. Fiber motion is usual cause such change, and Daino et al. have studied first-order statistics noise, assuming single frequency source. But source variation also noise; diversity has been shown effective its reduction. In this paper we use theory approach to study dependence noise. We measured analyzed correlation two patterns as function difference, spatial distribution parameters. contrast length for several sources types. Such information permits prediction statistics, from corresponding changes rates be derived.