In fiber optic communications the technique of wavelength division multiplexing (WDM) constitutes a means of increasing the information capacity of fiber optics in communication systems and allows the optimal usage of the capacity of optic fiber. This paper presents the concepts of WDM and high density WDM from the point of view of developing a unitary theoretical analysis of necessary parameters for the design of optic integrated circuits with functions for optic signals multiplexing and demultiplexing, with planar diffraction gratings.
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