Electrical Computer Engineering

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    Performance Analysis of High Speed Fiber Optic Communication Systems with Optical OFDM and Dispersion Compensation Technique
    (Hawassa University, 2022-04-20) GIRMA HASENA HINSENE
    Several designers are employing fiber optics instead of copper wire to transport information between data ports to fulfill the high-speed requirements of today's communication systems since it offers several advantages such as high transmission capacity and low losses. Limitations and flaws such as chromatic dispersion hamper the performance of optical fiber communication systems. Tolerating the effects of chromatic dispersion in optical communication systems, various classic dispersion compensation techniques such as Dispersion Compensation Fiber (DCF) and Fiber Bragg Grating (FBG) have been used. Advanced modulation schemes, such as orthogonal frequency division multiplexing (OFDM), are excellent candidates for improving spectrum efficiency in communication systems by reducing chromatic dispersion effects. That is FBG uses the principle of recompression of light signals with different wavelengths to reduce the effect of chromatic dispersion. And OFDM uses the orthogonality principle between subcarriers with the insertion of cyclic prefix and guard bands to reduce the effect of chromatic dispersion. The performance of a high-speed optical fiber communication system was investigated using coherent optical OFDM (Co-O-OFDM) and Fiber Bragg grating (FBG) as dispersion compensation techniques in this thesis study. The system models were simulated using Optisystem simulation software, and the output was plotted using MATLAB. Performance measuring metrics such as optical signal to noise ratio (OSNR), bit error rate (BER) and Quality-factor were used to thoroughly examine the results. RF spectrum, optical spectrum, and constellation diagram of the signal were examined at different distances to see the effect of chromatic dispersion. The performance of both DP-16QAM Co-O-OFDM and FBG integrated DP-16QAM Co-O-OFDM systems declined as the signal propagated long distances of fiber optic for four different rates due effect of chromatic dispersion, and FBG integrated DP-16QAM Co-O-OFDM system performed better for the same rate and distance due to integration of FBG.