In-Line Chromatic Dispersion Compensation Of Fiber Optical Communication Systems
Afam Uzorka
Kampala International University
Living Ounyesiga
Kampala International University
Jean De Dieu Nshimiyimana
Keywords: Chromatic dispersion compensation, communication system, optical fiber, transmitter, MATLAB SIMULINK
Abstract
In order to meet the growing demand for the bandwidth for the internet and other related communications applications, future long-haul systems are required to operate at a bit rate of 10 Gbit/s, 40Gbit/s, or even higher. In high-capacity systems, dispersion compensation is critical. In this report, we have considered a simple chromatic dispersion compensation of optical fiber communication system including the transmitter and optical fibers standard and compensating types. This simulator model was completed using MATLAB SIMULINK. This prototype is designed in MATLAB SIMULINK in the Non-return to Zero Transmitter from the experimental setup. This simulator was designed considering the existing fiber optical communication systems. The transmission fibers in the existing network are the standard non-zero dispersion fibers (NZDF) with a nominal value for dispersion equal to +17ps/nm.km. Accumulation of dispersion in these fibers limits the transmission distance to approximately 60 to 300km for 10Gbit/s systems and 4 to 18km for 40Gbit/s systems if dispersion compensation is not employed. The above generic Standard Single-Mode Fiber (SMF) and Dispersion Compensating Fiber (DCF) propagation models are integrated with Non-Return-to-Zero (NRZ). After propagation through SMF, the Bit Error Rate (BER) is also compromised as expected due to the linear dispersion characteristics of the fiber. The effect of pulse broadening is effectively compensated by the DCF module as the BER improved which is considered reasonable for a typical optical transmission system. As there are always constant changes and improvements in optical communication systems, especially on modulation techniques, this SIMULINK model allows users to simulate various modulation formats to suit long-haul optical transmission systems for system design and planning.