The problem of signal degradation due to spatial filtration in graded-index fibers excited by single-mode lasers is considered. In particular, a computer simulation of the interfering pattern is used to predict the signal-to-noise ratios which would be measured given some degree of vignetting at the detector end of the fiber. An experiment is made and comparison with the simulation results shows acceptable agreement.
© 1983 Optical Society of America
Alan R. Mickelson and Audun Weierholt, "Modal noise-limited signal-to-noise ratios in multimode optical fibers," Appl. Opt. 22, 3084-3089 (1983)