Abstract
5G mobile networks targets wireless connection capacity up to 10 Gb/s. For this purpose, we propose a method to considerably increase capacity. In this paper first, we show how to compensate the effects of polarization mode dispersion (PMD) in systems with double polarizations where PMD in such systems could cause fluctuations in optical transmission due to crosstalk and cross phase modulation. Second, we show how to enhance system capacity benefiting from polarization multiplexing (POL-MUX) technique which can provide double bandwidth efficiency. Based on the simulation results, we have achieved optimum system performance and we were able to reduce the PMD effect using pre- and post-compensation. We also have improved the POL-MUX technique using coherent detection in case of 16/64 QAM modulations. The results were achieved by implementing polarization controllers, polarization beam combiners and splitters, as well as polarization phase shifters.
Highlights
The polarization multiplex (POL-MUX) optical system will play a major role in the design of future 5G integrated transport systems (Popovskyy and Iskandar 2016) since it is the evolution of the 4G network architecture
Using polarization multiplexing in an optical transmission system is to increase the capacity of the optical fiber network by transmitting information over two orthogonal polarization states (Rochat et al 2004; Cybulski and Perlicki 2018; Gui et al 2018)
The second method is the optical compensation of polarization mode dispersion (PMD) that is based on polarization controllers
Summary
The polarization multiplex (POL-MUX) optical system will play a major role in the design of future 5G integrated transport systems (Popovskyy and Iskandar 2016) since it is the evolution of the 4G network architecture. That makes a high-speed transmission system possible by using lower speed electronics (Forbes et al 2016; Wang et al 2018) The advantages of this technique are: first, increasing the bit rate without increasing the penalties due to the phenomena of dispersion, second, there is simplicity of the equipment used. There is a relation between the PMD and DGD , the group time delay between the two-polarization modes. The second method is the optical compensation of PMD that is based on polarization controllers. The spectrum analysis method is used to evaluate the differential group delay (DGD) by measuring PMD linear and non-linear spectral characteristics induced by signal distortion. The last method is the measurement of polarization degree (DOP) The efficiency of this method depends on the ratio between the differential group delay (DGD) and the bit time. The advantages of the third and fourth methods are that they are analogue, fast and asynchronous
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