In this paper we present a new method for estimating the bandwidth of multimode optical fibers based on the frequency correlation function of the speckle patterns generated by the interference of fiber modes. This technique, which does not require a pulse or signal generator, can be utilized to estimate the bandwidth of a multimode fiber using a relatively short length of fiber. By applying this method to a test fiber we obtained a bandwidth of ~36 MHz . km which is in relatively good agreement with the ~44-MHz . km bandwidth measured by a conventional pulsed technique.
© 1983 Optical Society of America
Behzad Moslehi, Joseph W. Goodman, and Eric G. Rawson, "Bandwidth estimation for multimode optical fibers using the frequency correlation function of speckle patterns," Appl. Opt. 22, 995-999 (1983)