Performance Analysis of Optical Orthogonal Frequency Division Multiplexing

日期 : Nov 2017 - Jul 2018

Orthogonal frequency division multiplexing (OFDM) is now being famous in optical communication that is the advancement towards software-enhance optical transmissions. Coherent Optical OFDM (CO-OFDM) has the advantage of software capabilities of Digital Signal Processing (DSP) to provide refined operations and shows its easiness of gaining high spectral efficiency and cope with various distortions at the same time. CO-OFDM is extensively used due to its robustness to fiber dispersion and high Spectral Efficiency (SE) and it is also considered as a most successful technique for long haul-optical fiber transmission systems. In this study, we start with a discussion of basic concepts of OFDM and PAPR in detail and then moves to the detailed description of schemes used to reduce high PAPR loss. Then, we make a theoretical study of the basic concepts of CO-OFDM and Direct Detection OFDM (DD-OFDM). Finally, by using Optisystem, a special simulation program, we simulate and analyze these systems system. We analysis the various results like RF spectrum, constellation diagrams and Optical Signal to Noise Ratio (OSNR) and eye diagram and compare the two systems. Finally, we test the use of wavelength division multiplexing system (WDM) with (CO-OFDM) system, to increase the system performance and gain high data rates.