Electrical and Electronic Engineering - Theses

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Homodyne Crosstalk in Wavelength-Division Multiplexed Ring and Bus Networks

Dods, Sarah D. ( 2000)

Crosstalk in optical communications systems is caused by small, interfering optical signals arriving at a receiver simultaneously with a desired signal. The interfering signals degrade the quality of the data channel that is modulated on to the desired signal, causing an increase in its bit-error rate. Optical crosstalk can be classified as either heterodyne, if the main and interfering signals are at different wavelengths, or homodyne, if the signals have the same nominal wavelength. Homodyne crosstalk is the more insidious of the two, as it cannot be removed by filtering at the receiver, and may cause much greater signal degradation. Wavelength-division multiplexed (WDM) networks are particularly susceptible to optical crosstalk, because they transport multiple optical signals at various wavelengths. Ring and bus networks represent the simplest physical topology that is used in WDM networks. In these structures, each node is connected to a central trunk, providing only one possible path between two nodes (or two for a bi-directional ring). (For complete abstract open document)