Design and Performance Analysis of Coherent-OOFDM Techniques in Wavelength Division Multiplexing Optical Network for Long-Haul Communication

Abstract

Today, communication is a crucial factor and requires a high data rate for transmission with in an error-free environment, so 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 integrating with some modern processing and modulator techniques are applied in different areas that need transfer of data from one point to another through reducing an optical affect. Coherent OOFDM is a popular technique in optical communication today because of the excessive spectral efficiency, immune to interference, and tolerance of the fiber dispersion. Additionally, it could be a good choice for long-haul optical fiber transmission structures. Coherent-OOFDM employs the OFDM modulation method, which is a type of multicarrier modulation (MCM) in which data statistics are distributed over a large number of low-cost subcarriers and is a solution to inter symbol interference. The main advantage of coherent OOFDM is that it can deal with a truly unlimited amount of ISI. ISI is generated by chromatic dispersion in high-speed optical communication systems, and it is a severe issue in long-haul systems in the case of higher data rates transmission. The use of standard dispersion compensating devices, such as dispersion compensating fibers, does not completely compensate for high order dispersion, which includes third-order and high dispersion effects and also increase the loses of the system because it is a fiber in it self.so, the purpose of this study deign and performance analysis of the concept of coherent-OOFDM techniques in to the WDM optical network in the case of multiple users, high data rate transmition and long-haul optical link to reduce the optical transmition related issues (ISI, BER etc.) and to improve the performance of optical network. The performance of the proposed network can be evaluated using by different parameters such as SNR, BER, OSNR, Quality factor and eye-diagram at different fiber length transmission by using Optisystem software and in terms of OSNR, SNR, and BER values, the results suggest that coherent-OOFDM-WDM well performance compare to the existing WDM system.