AG Kommunikationstheorie

Thema:

Optimizing Wavelength Division Multiplexing-based Optical Wireless Communication Signaling System

Abstract:

Optical wireless communication (OWC) can be an interesting alternative to RF and fiber optic communication and wavelength-division multiplexing (WDM) technique can be easily integrated with OWC and it is able to considerably increase the bitrate. However, reliability and capacity still are two main challenges in these systems. In fact, reliability problems cause a high bit error rate (BER) and OWC has gained significantly lower capacity than optical fiber. This research tries to increase the reliability of WDM-based OWC by proposing a new pulse shape and to increase the capacity of the system by generating dense and accurate wavelengths and applying the proposed pulse shape. At first, a new pulse shape (solitonic) for OWC is proposed and then appropriate picosecond solitonic pulses are generated using a new technology called microring resonators (MRRs). The performance of the proposed pulse shape is analyzed in terms of BER where, OOK-NRZ modulation scheme is applied and the channel is modelled as an additive white Gaussian noise (AWGN) channel. Results show the superiority of the proposed pulse shape for OWC in terms of BER compared to the previous applied pulse shapes. In order to increase the capacity, a system of MRRs are proposed which offers a high capacity channel with accurate free spectral range (FSR), full width at half maximum (FWHM), and intensity applicable for WDM-based OWC. By applying the proposed pulse shapes and accurate wavelengths in a WDM-based OWC system the results show a significant improvement in terms of BER and capacity. The results of this research are applicable for both the indoor and outdoor WDM-based OWC and help to decrease BER and increase the capacity which lead to have a higher data transmission rate.



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