Design and Analysis of 5×15Gbps Optical DCDM based communication system

Abstract

—Multiplexing is an essential part in a communication system. It is widely employed due to increase transmission capacity and to reduce system costs. There are three basic types of multiplexing technique in communication systems; time division multiplexing (TDM), frequency or wavelength division multiplexing (FDM) or (WDM), and code division multiplexing (CDM). However, for multiplexing high number of users with high data rates, high speed multiplexer and de-multiplexer are required. At higher speeds clock recovery is another essential issue which limit the conventional multiplexing techniques. Therefore, many investigations have been done to design and develop reliable and cost-effective clock recovery modules for TDM in both the electrical and optical (thus, OTDM) versions. Realizing these problems the design of five users Duty Cycle Division Multiplexing (DCDM) based Optical communication system has been proposed in this paper. The performance comparison of 5 × 5Gbps, 5 ×10Gbps and 5 ×15Gbps has been done. The system performance is evaluated on the basis of the BER for all five users, link range, signal to noise ratio & Q-factor. It has been observed that at 15 Gbps data rate the signal is successfully transmitted up to 100 Km distance. Also the minimum received power required for the DCDM users to get BER of 10^-9 is calculated as -24.12 dBm.