Modeling and Performance Analysis of High Speed Optical Fiber Communication with Orthogonal Frequency Division Multiplexing

Abstract

The optical communication has emerged as a best solution to high-speed transmission systems due to its higher bandwidth and higher data rates. Fiber optic transmission is applied in various areas that need transfer of data from one point to another. The higher data rates with simple transmitter and receiver modeling is one of the best solutions to design the spectrally efficient high speed optical transmission system using different modulation techniques. Therefore, the current telecommunications infrastructure is depend on optical fibers for transmission of data from one place to another, because of their higher bandwidth and low attenuation. In the recent past, optical communication networks have been specifically designed and optimized to support different communication standards increasing the capabilities of optic fiber, integrated waveguides and related optical fiber hardware, and signal conditioning circuits. So this thesis presents study, modeling, simulation and analysis of optical performance under different transmission system which is considered in a practical high speed design using Orthogonal Frequency Division Multiplexing (OFDM). This can be done by using both Coherent Detection OFDM and Direct Detection OFDM to minimize dispersion effects in optical communication because OFDM is basic for modern technology to increase the data rate and increase the requirement of bandwidth in broadband services. Many optical fiber problems, such as chromatic dispersion (CD) and polarization mode dispersion (PMD) are solved using OFDM. The performance analyses made in this work by using different parameters such as BER, OSNR, Quality factor at different distance transmission by using different quadrature modulations. These are 4-QAM, 16-QAM, 32-QAM, 64-QAM to maintain the OSNR value, spectral efficiency and the required data rates. Different results for these all M-QAM modulation at different distances and at different Quadrature modulation at different stage. It observed RF spectrum values, different constellation diagram and the result of the relationship between BER and OSNR values at different distances were observed. Comparison among different Quadrature modulators in terms of their BER and OSNR were analyzed.