"Modeling Telecommunications Components: Limits of the Gaussian Approximation," Photonics Spectra
Updated: Aug 12, 2014
Author(s): Joe Shiefman
"The term "crosstalk" describes the phenomenon of power leaking from one channel of a wavelength division multiplexing (WDM) system into a neighboring one. One of the most important design issues for optical communications systems, crosstalk can seriously degrade system performance because it represents noise power relative to the signal power of a given channel.
Determining the amount of crosstalk in a WDM component under design is very dependent on the model that is used to represent the mode field of the fibers carrying light into and out of the component. A single-mode, step-index fiber is defined by a J0 Bessel function for the region inside the core and by a decaying K0 Bessel function inside the cladding. This is referred to as the fundamental fiber mode. ..."
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