This paper presents a numerical analysis of the dispersive effects of light polarization in optical fibers. This study analyzed the behavior of the degree of polarization using the Jones matrix method for modeling the transmission channel as a concatenation of 15 sections of polarization scramblers of PMD and PDL, using the RZ, RZ and CSRZ rectangular digital signals. The numerical simulation considers the effects of first order PMD and PDL.

Due to the increasing demand for data services in mobile networks, operators are observing the quality of data services to degrade as their packed switched (PS) resources become insufficient. Even though there are newer 3/4G technologies available, EGPRS is still a good solution for data services due to ubiquitous coverage, the availability of low cost user terminals and its low deployment costs. Hence, alternative solutions are needed to deal with this increased data traffic without affecting the voice services, which play an important role in GSM networks. This paper presents a study on the usage of the Orthogonal Sub Channels (OSC) for improving voice capacity in order to increase the available resources for PS data services in a GSM/EGPRS network, showing that along with OSC it is possible to increase the number of EGPRS subscribers without extensive capital expenditure, such as increasing the number of radios or acquiring further spectrum resources.

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